2b5f62a0b2
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18040 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1169 lines
38 KiB
TeX
1169 lines
38 KiB
TeX
\section{\class{wxString}}\label{wxstring}
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wxString is a class representing a character string. Please see the
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\helpref{wxString overview}{wxstringoverview} for more information about it. As explained
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there, wxString implements about 90\% of methods of the std::string class (iterators
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are not supported, nor all methods which use them).
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These standard functions are not documented in this manual so please see the STL documentation.
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The behaviour of all these functions is identical to the behaviour described
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there.
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\wxheading{Derived from}
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None
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\wxheading{Include files}
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<wx/string.h>
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\wxheading{Predefined objects}
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Objects:
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{\bf wxEmptyString}
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\wxheading{See also}
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\overview{Overview}{wxstringoverview}
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\latexignore{\rtfignore{\wxheading{Function groups}}}
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\membersection{Constructors and assignment operators}
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A string may be constructed either from a C string, (some number of copies of)
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a single character or a wide (UNICODE) string. For all constructors (except the
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default which creates an empty string) there is also a corresponding assignment
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operator.
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\helpref{wxString}{wxstringconstruct}\\
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\helpref{operator $=$}{wxstringoperatorassign}\\
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\helpref{\destruct{wxString}}{wxstringdestruct}
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\membersection{String length}
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These functions return the string length and check whether the string is empty
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or empty it.
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\helpref{Len}{wxstringlen}\\
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\helpref{IsEmpty}{wxstringisempty}\\
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\helpref{operator!}{wxstringoperatornot}\\
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\helpref{Empty}{wxstringempty}\\
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\helpref{Clear}{wxstringclear}
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\membersection{Character access}
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Many functions in this section take a character index in the string. As with C
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strings and/or arrays, the indices start from $0$, so the first character of a
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string is string[$0$]. Attempt to access a character beyond the end of the
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string (which may be even $0$ if the string is empty) will provoke an assert
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failure in \helpref{debug build}{debuggingoverview}, but no checks are done in
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release builds.
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This section also contains both implicit and explicit conversions to C style
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strings. Although implicit conversion is quite convenient, it is advised to use
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explicit \helpref{c\_str()}{wxstringcstr} method for the sake of clarity. Also
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see \helpref{overview}{wxstringadvices} for the cases where it is necessary to
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use it.
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\helpref{GetChar}{wxstringgetchar}\\
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\helpref{GetWritableChar}{wxstringgetwritablechar}\\
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\helpref{SetChar}{wxstringsetchar}\\
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\helpref{Last}{wxstringlast}\\
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\helpref{operator []}{wxstringoperatorbracket}\\
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\helpref{c\_str}{wxstringcstr}\\
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\helpref{operator const char*}{wxstringoperatorconstcharpt}
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\membersection{Concatenation}
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Anything may be concatenated (appended to) with a string. However, you can't
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append something to a C string (including literal constants), so to do this it
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should be converted to a wxString first.
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\helpref{operator \cinsert}{wxstringoperatorout}\\
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\helpref{operator $+=$}{wxstringplusequal}\\
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\helpref{operator $+$}{wxstringoperatorplus}\\
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\helpref{Append}{wxstringappend}\\
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\helpref{Prepend}{wxstringprepend}
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\membersection{Comparison}
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The default comparison function \helpref{Cmp}{wxstringcmp} is case-sensitive and
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so is the default version of \helpref{IsSameAs}{wxstringissameas}. For case
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insensitive comparisons you should use \helpref{CmpNoCase}{wxstringcmpnocase} or
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give a second parameter to IsSameAs. This last function is may be more
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convenient if only equality of the strings matters because it returns a boolean
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true value if the strings are the same and not 0 (which is usually FALSE in C)
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as {\tt Cmp()} does.
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\helpref{Matches}{wxstringmatches} is a poor man's regular expression matcher:
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it only understands '*' and '?' metacharacters in the sense of DOS command line
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interpreter.
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\helpref{StartsWith}{wxstringstartswith} is helpful when parsing a line of
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text which should start with some predefined prefix and is more efficient than
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doing direct string comparison as you would also have to precalculate the
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length of the prefix then.
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\helpref{Cmp}{wxstringcmp}\\
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\helpref{CmpNoCase}{wxstringcmpnocase}\\
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\helpref{IsSameAs}{wxstringissameas}\\
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\helpref{Matches}{wxstringmatches}\\
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\helpref{StartsWith}{wxstringstartswith}
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\membersection{Substring extraction}
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These functions allow to extract substring from this string. All of them don't
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modify the original string and return a new string containing the extracted
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substring.
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\helpref{Mid}{wxstringmid}\\
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\helpref{operator()}{wxstringoperatorparenth}\\
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\helpref{Left}{wxstringleft}\\
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\helpref{Right}{wxstringright}\\
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\helpref{BeforeFirst}{wxstringbeforefirst}\\
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\helpref{BeforeLast}{wxstringbeforelast}\\
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\helpref{AfterFirst}{wxstringafterfirst}\\
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\helpref{AfterLast}{wxstringafterlast}\\
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\helpref{StartsWith}{wxstringstartswith}
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\membersection{Case conversion}
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The MakeXXX() variants modify the string in place, while the other functions
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return a new string which contains the original text converted to the upper or
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lower case and leave the original string unchanged.
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\helpref{MakeUpper}{wxstringmakeupper}\\
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\helpref{Upper}{wxstringupper}\\
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\helpref{MakeLower}{wxstringmakelower}\\
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\helpref{Lower}{wxstringlower}
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\membersection{Searching and replacing}
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These functions replace the standard {\it strchr()} and {\it strstr()}
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functions.
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\helpref{Find}{wxstringfind}\\
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\helpref{Replace}{wxstringreplace}
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\membersection{Conversion to numbers}
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The string provides functions for conversion to signed and unsigned integer and
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floating point numbers. All three functions take a pointer to the variable to
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put the numeric value in and return TRUE if the {\bf entire} string could be
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converted to a number.
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\helpref{ToLong}{wxstringtolong}\\
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\helpref{ToULong}{wxstringtoulong}\\
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\helpref{ToDouble}{wxstringtodouble}
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\membersection{Writing values into the string}
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Both formatted versions (\helpref{Printf}{wxstringprintf}) and stream-like
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insertion operators exist (for basic types only). Additionally, the
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\helpref{Format}{wxstringformat} function allows to use simply append
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formatted value to a string:
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\begin{verbatim}
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// the following 2 snippets are equivalent
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wxString s = "...";
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s += wxString::Format("%d", n);
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wxString s;
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s.Printf("...%d", n);
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\end{verbatim}
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\helpref{Format}{wxstringformat}\\
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\helpref{FormatV}{wxstringformatv}\\
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\helpref{Printf}{wxstringprintf}\\
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\helpref{PrintfV}{wxstringprintfv}\\
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\helpref{operator \cinsert}{wxstringoperatorout}
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\membersection{Memory management}
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These are "advanced" functions and they will be needed quite rarely.
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\helpref{Alloc}{wxstringalloc} and \helpref{Shrink}{wxstringshrink} are only
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interesting for optimization purposes.
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\helpref{GetWriteBuf}{wxstringgetwritebuf} may be very useful when working with
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some external API which requires the caller to provide a writable buffer, but
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extreme care should be taken when using it: before performing any other
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operation on the string \helpref{UngetWriteBuf}{wxstringungetwritebuf} {\bf
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must} be called!
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\helpref{Alloc}{wxstringalloc}\\
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\helpref{Shrink}{wxstringshrink}\\
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\helpref{GetWriteBuf}{wxstringgetwritebuf}\\
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\helpref{UngetWriteBuf}{wxstringungetwritebuf}
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\membersection{Miscellaneous}
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Other string functions.
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\helpref{Trim}{wxstringtrim}\\
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\helpref{Pad}{wxstringpad}\\
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\helpref{Truncate}{wxstringtruncate}
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\membersection{wxWindows 1.xx compatibility functions}
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These functions are deprecated, please consider using new wxWindows 2.0
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functions instead of them (or, even better, std::string compatible variants).
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\helpref{SubString}{wxstringsubstring}\\
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\helpref{sprintf}{wxstringsprintf}\\
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\helpref{CompareTo}{wxstringcompareto}\\
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\helpref{Length}{wxstringlength}\\
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\helpref{Freq}{wxstringfreq}\\
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\helpref{LowerCase}{wxstringlowercase}\\
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\helpref{UpperCase}{wxstringuppercase}\\
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\helpref{Strip}{wxstringstrip}\\
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\helpref{Index}{wxstringindex}\\
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\helpref{Remove}{wxstringremove}\\
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\helpref{First}{wxstringfirst}\\
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\helpref{Last}{wxstringlast}\\
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\helpref{Contains}{wxstringcontains}\\
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\helpref{IsNull}{wxstringisnull}\\
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\helpref{IsAscii}{wxstringisascii}\\
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\helpref{IsNumber}{wxstringisnumber}\\
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\helpref{IsWord}{wxstringisword}
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\membersection{std::string compatibility functions}\label{wxstringat}
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The supported functions are only listed here, please see any STL reference for
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their documentation.
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\begin{verbatim}
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// take nLen chars starting at nPos
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wxString(const wxString& str, size_t nPos, size_t nLen);
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// take all characters from pStart to pEnd (poor man's iterators)
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wxString(const void *pStart, const void *pEnd);
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// lib.string.capacity
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// return the length of the string
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size_t size() const;
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// return the length of the string
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size_t length() const;
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// return the maximum size of the string
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size_t max_size() const;
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// resize the string, filling the space with c if c != 0
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void resize(size_t nSize, char ch = '\0');
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// delete the contents of the string
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void clear();
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// returns true if the string is empty
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bool empty() const;
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// lib.string.access
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// return the character at position n
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char at(size_t n) const;
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// returns the writable character at position n
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char& at(size_t n);
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// lib.string.modifiers
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// append a string
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wxString& append(const wxString& str);
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// append elements str[pos], ..., str[pos+n]
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wxString& append(const wxString& str, size_t pos, size_t n);
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// append first n (or all if n == npos) characters of sz
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wxString& append(const char *sz, size_t n = npos);
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// append n copies of ch
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wxString& append(size_t n, char ch);
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// same as `this_string = str'
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wxString& assign(const wxString& str);
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// same as ` = str[pos..pos + n]
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wxString& assign(const wxString& str, size_t pos, size_t n);
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// same as `= first n (or all if n == npos) characters of sz'
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wxString& assign(const char *sz, size_t n = npos);
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// same as `= n copies of ch'
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wxString& assign(size_t n, char ch);
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// insert another string
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wxString& insert(size_t nPos, const wxString& str);
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// insert n chars of str starting at nStart (in str)
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wxString& insert(size_t nPos, const wxString& str, size_t nStart, size_t n);
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// insert first n (or all if n == npos) characters of sz
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wxString& insert(size_t nPos, const char *sz, size_t n = npos);
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// insert n copies of ch
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wxString& insert(size_t nPos, size_t n, char ch);
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// delete characters from nStart to nStart + nLen
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wxString& erase(size_t nStart = 0, size_t nLen = npos);
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// replaces the substring of length nLen starting at nStart
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wxString& replace(size_t nStart, size_t nLen, const char* sz);
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// replaces the substring with nCount copies of ch
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wxString& replace(size_t nStart, size_t nLen, size_t nCount, char ch);
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// replaces a substring with another substring
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wxString& replace(size_t nStart, size_t nLen,
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const wxString& str, size_t nStart2, size_t nLen2);
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// replaces the substring with first nCount chars of sz
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wxString& replace(size_t nStart, size_t nLen,
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const char* sz, size_t nCount);
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// swap two strings
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void swap(wxString& str);
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// All find() functions take the nStart argument which specifies the
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// position to start the search on, the default value is 0. All functions
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// return npos if there were no match.
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// find a substring
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size_t find(const wxString& str, size_t nStart = 0) const;
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// find first n characters of sz
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size_t find(const char* sz, size_t nStart = 0, size_t n = npos) const;
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// find the first occurrence of character ch after nStart
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size_t find(char ch, size_t nStart = 0) const;
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// rfind() family is exactly like find() but works right to left
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// as find, but from the end
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size_t rfind(const wxString& str, size_t nStart = npos) const;
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// as find, but from the end
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size_t rfind(const char* sz, size_t nStart = npos,
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size_t n = npos) const;
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// as find, but from the end
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size_t rfind(char ch, size_t nStart = npos) const;
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// find first/last occurrence of any character in the set
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//
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size_t find_first_of(const wxString& str, size_t nStart = 0) const;
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//
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size_t find_first_of(const char* sz, size_t nStart = 0) const;
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// same as find(char, size_t)
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size_t find_first_of(char c, size_t nStart = 0) const;
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//
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size_t find_last_of (const wxString& str, size_t nStart = npos) const;
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//
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size_t find_last_of (const char* s, size_t nStart = npos) const;
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// same as rfind(char, size_t)
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size_t find_last_of (char c, size_t nStart = npos) const;
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// find first/last occurrence of any character not in the set
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//
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size_t find_first_not_of(const wxString& str, size_t nStart = 0) const;
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//
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size_t find_first_not_of(const char* s, size_t nStart = 0) const;
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//
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size_t find_first_not_of(char ch, size_t nStart = 0) const;
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//
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size_t find_last_not_of(const wxString& str, size_t nStart=npos) const;
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//
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size_t find_last_not_of(const char* s, size_t nStart = npos) const;
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//
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size_t find_last_not_of(char ch, size_t nStart = npos) const;
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// All compare functions return a negative, zero or positive value
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// if the [sub]string is less, equal or greater than the compare() argument.
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// just like strcmp()
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int compare(const wxString& str) const;
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// comparison with a substring
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int compare(size_t nStart, size_t nLen, const wxString& str) const;
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// comparison of 2 substrings
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int compare(size_t nStart, size_t nLen,
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const wxString& str, size_t nStart2, size_t nLen2) const;
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// just like strcmp()
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int compare(const char* sz) const;
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// substring comparison with first nCount characters of sz
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int compare(size_t nStart, size_t nLen,
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const char* sz, size_t nCount = npos) const;
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// substring extraction
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wxString substr(size_t nStart = 0, size_t nLen = npos) const;
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\end{verbatim}
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%%%%% MEMBERS HERE %%%%%
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\helponly{\insertatlevel{2}{
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\wxheading{Members}
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}}
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\membersection{wxString::wxString}\label{wxstringconstruct}
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\func{}{wxString}{\void}
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Default constructor.
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\func{}{wxString}{\param{const wxString\&}{ x}}
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Copy constructor.
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\func{}{wxString}{\param{char}{ ch}, \param{size\_t}{ n = 1}}
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Constructs a string of {\it n} copies of character {\it ch}.
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\func{}{wxString}{\param{const char*}{ psz}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}}
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Takes first {\it nLength} characters from the C string {\it psz}.
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The default value of wxSTRING\_MAXLEN means to take all the string.
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Note that this constructor may be used even if {\it psz} points to a buffer
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with binary data (i.e. containing {\tt NUL} characters) as long as you provide
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the correct value for {\it nLength}. However, the default form of it works
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only with strings without intermediate {\tt NUL}s because it uses
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{\tt strlen()} to calculate the effective length and it would not give correct
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results otherwise.
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\func{}{wxString}{\param{const unsigned char*}{ psz}, \param{size\_t}{ nLength = wxSTRING\_MAXLEN}}
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For compilers using unsigned char: takes first {\it nLength} characters from the C string {\it psz}.
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The default value of wxSTRING\_MAXLEN means take all the string.
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\func{}{wxString}{\param{const wchar\_t*}{ psz}}
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Constructs a string from the wide (UNICODE) string.
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\membersection{wxString::\destruct{wxString}}\label{wxstringdestruct}
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\func{}{\destruct{wxString}}{\void}
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String destructor. Note that this is not virtual, so wxString must not be inherited from.
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\membersection{wxString::Alloc}\label{wxstringalloc}
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\func{void}{Alloc}{\param{size\_t}{ nLen}}
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Preallocate enough space for wxString to store {\it nLen} characters. This function
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may be used to increase speed when the string is constructed by repeated
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concatenation as in
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\begin{verbatim}
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// delete all vowels from the string
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wxString DeleteAllVowels(const wxString& original)
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{
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wxString result;
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size_t len = original.length();
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result.Alloc(len);
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for ( size_t n = 0; n < len; n++ )
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{
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if ( strchr("aeuio", tolower(original[n])) == NULL )
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result += original[n];
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}
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return result;
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}
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\end{verbatim}
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because it will avoid the need of reallocating string memory many times (in case
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of long strings). Note that it does not set the maximal length of a string - it
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will still expand if more than {\it nLen} characters are stored in it. Also, it
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does not truncate the existing string (use
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\helpref{Truncate()}{wxstringtruncate} for this) even if its current length is
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greater than {\it nLen}
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\membersection{wxString::Append}\label{wxstringappend}
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\func{wxString\&}{Append}{\param{const char*}{ psz}}
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Concatenates {\it psz} to this string, returning a reference to it.
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\func{wxString\&}{Append}{\param{char}{ ch}, \param{int}{ count = 1}}
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Concatenates character {\it ch} to this string, {\it count} times, returning a reference
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to it.
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\membersection{wxString::AfterFirst}\label{wxstringafterfirst}
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\constfunc{wxString}{AfterFirst}{\param{char}{ ch}}
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Gets all the characters after the first occurrence of {\it ch}.
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|
Returns the empty string if {\it ch} is not found.
|
|
|
|
\membersection{wxString::AfterLast}\label{wxstringafterlast}
|
|
|
|
\constfunc{wxString}{AfterLast}{\param{char}{ ch}}
|
|
|
|
Gets all the characters after the last occurrence of {\it ch}.
|
|
Returns the whole string if {\it ch} is not found.
|
|
|
|
\membersection{wxString::BeforeFirst}\label{wxstringbeforefirst}
|
|
|
|
\constfunc{wxString}{BeforeFirst}{\param{char}{ ch}}
|
|
|
|
Gets all characters before the first occurrence of {\it ch}.
|
|
Returns the whole string if {\it ch} is not found.
|
|
|
|
\membersection{wxString::BeforeLast}\label{wxstringbeforelast}
|
|
|
|
\constfunc{wxString}{BeforeLast}{\param{char}{ ch}}
|
|
|
|
Gets all characters before the last occurrence of {\it ch}.
|
|
Returns the empty string if {\it ch} is not found.
|
|
|
|
\membersection{wxString::c\_str}\label{wxstringcstr}
|
|
|
|
\constfunc{const char *}{c\_str}{\void}
|
|
|
|
Returns a pointer to the string data.
|
|
|
|
\membersection{wxString::Clear}\label{wxstringclear}
|
|
|
|
\func{void}{Clear}{\void}
|
|
|
|
Empties the string and frees memory occupied by it.
|
|
|
|
See also: \helpref{Empty}{wxstringempty}
|
|
|
|
\membersection{wxString::Cmp}\label{wxstringcmp}
|
|
|
|
\constfunc{int}{Cmp}{\param{const char*}{ psz}}
|
|
|
|
Case-sensitive comparison.
|
|
|
|
Returns a positive value if the string is greater than the argument, zero if
|
|
it is equal to it or a negative value if it is less than the argument (same semantics
|
|
as the standard {\it strcmp()} function).
|
|
|
|
See also \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas}.
|
|
|
|
\membersection{wxString::CmpNoCase}\label{wxstringcmpnocase}
|
|
|
|
\constfunc{int}{CmpNoCase}{\param{const char*}{ psz}}
|
|
|
|
Case-insensitive comparison.
|
|
|
|
Returns a positive value if the string is greater than the argument, zero if
|
|
it is equal to it or a negative value if it is less than the argument (same semantics
|
|
as the standard {\it strcmp()} function).
|
|
|
|
See also \helpref{Cmp}{wxstringcmp}, \helpref{IsSameAs}{wxstringissameas}.
|
|
|
|
\membersection{wxString::CompareTo}\label{wxstringcompareto}
|
|
|
|
\begin{verbatim}
|
|
#define NO_POS ((int)(-1)) // undefined position
|
|
enum caseCompare {exact, ignoreCase};
|
|
\end{verbatim}
|
|
|
|
\constfunc{int}{CompareTo}{\param{const char*}{ psz}, \param{caseCompare}{ cmp = exact}}
|
|
|
|
Case-sensitive comparison. Returns 0 if equal, 1 if greater or -1 if less.
|
|
|
|
\membersection{wxString::Contains}\label{wxstringcontains}
|
|
|
|
\constfunc{bool}{Contains}{\param{const wxString\&}{ str}}
|
|
|
|
Returns 1 if target appears anyhere in wxString; else 0.
|
|
|
|
\membersection{wxString::Empty}\label{wxstringempty}
|
|
|
|
\func{void}{Empty}{\void}
|
|
|
|
Makes the string empty, but doesn't free memory occupied by the string.
|
|
|
|
See also: \helpref{Clear()}{wxstringclear}.
|
|
|
|
\membersection{wxString::Find}\label{wxstringfind}
|
|
|
|
\constfunc{int}{Find}{\param{char}{ ch}, \param{bool}{ fromEnd = FALSE}}
|
|
|
|
Searches for the given character. Returns the starting index, or -1 if not found.
|
|
|
|
\constfunc{int}{Find}{\param{const char*}{ sz}}
|
|
|
|
Searches for the given string. Returns the starting index, or -1 if not found.
|
|
|
|
\membersection{wxString::First}\label{wxstringfirst}
|
|
|
|
\func{size\_t}{First}{\param{char}{ c}}
|
|
|
|
\constfunc{size\_t}{First}{\param{const char*}{ psz}}
|
|
|
|
\constfunc{size\_t}{First}{\param{const wxString\&}{ str}}
|
|
|
|
\constfunc{size\_t}{First}{\param{const char}{ ch}}
|
|
|
|
Returns the first occurrence of the item.
|
|
|
|
\membersection{wxString::Format}\label{wxstringformat}
|
|
|
|
\func{static wxString}{Format}{\param{const wxChar }{*format}, \param{}{...}}
|
|
|
|
This static function returns the string containing the result of calling
|
|
\helpref{Printf}{wxstringprintf} with the passed parameters on it.
|
|
|
|
\wxheading{See also}
|
|
|
|
\helpref{FormatV}{wxstringformatv}, \helpref{Printf}{wxstringprintf}
|
|
|
|
\membersection{wxString::FormatV}\label{wxstringformatv}
|
|
|
|
\func{static wxString}{Format}{\param{const wxChar }{*format}, \param{va\_list }{argptr}}
|
|
|
|
This static function returns the string containing the result of calling
|
|
\helpref{PrintfV}{wxstringprintfv} with the passed parameters on it.
|
|
|
|
\wxheading{See also}
|
|
|
|
\helpref{Format}{wxstringformat}, \helpref{PrintfV}{wxstringprintfv}
|
|
|
|
\membersection{wxString::Freq}\label{wxstringfreq}
|
|
|
|
\constfunc{int}{Freq}{\param{char }{ch}}
|
|
|
|
Returns the number of occurrences of {\it ch} in the string.
|
|
|
|
\membersection{wxString::GetChar}\label{wxstringgetchar}
|
|
|
|
\constfunc{char}{GetChar}{\param{size\_t}{ n}}
|
|
|
|
Returns the character at position {\it n} (read-only).
|
|
|
|
\membersection{wxString::GetData}\label{wxstringgetdata}
|
|
|
|
\constfunc{const char*}{GetData}{\void}
|
|
|
|
wxWindows compatibility conversion. Returns a constant pointer to the data in the string.
|
|
|
|
\membersection{wxString::GetWritableChar}\label{wxstringgetwritablechar}
|
|
|
|
\func{char\&}{GetWritableChar}{\param{size\_t}{ n}}
|
|
|
|
Returns a reference to the character at position {\it n}.
|
|
|
|
\membersection{wxString::GetWriteBuf}\label{wxstringgetwritebuf}
|
|
|
|
\func{char*}{GetWriteBuf}{\param{size\_t}{ len}}
|
|
|
|
Returns a writable buffer of at least {\it len} bytes.
|
|
|
|
Call \helpref{wxString::UngetWriteBuf}{wxstringungetwritebuf} as soon as possible
|
|
to put the string back into a reasonable state.
|
|
|
|
\membersection{wxString::Index}\label{wxstringindex}
|
|
|
|
\constfunc{size\_t}{Index}{\param{char}{ ch}}
|
|
|
|
Same as \helpref{wxString::Find}{wxstringfind}.
|
|
|
|
\constfunc{size\_t}{Index}{\param{const char*}{ sz}}
|
|
|
|
Same as \helpref{wxString::Find}{wxstringfind}.
|
|
|
|
\constfunc{size\_t}{Index}{\param{const char*}{ sz}, \param{bool}{ caseSensitive = TRUE}, \param{bool}{ fromEnd = FALSE}}
|
|
|
|
Search the element in the array, starting from either side.
|
|
|
|
If {\it fromEnd} is TRUE, reverse search direction.
|
|
|
|
If {\bf caseSensitive}, comparison is case sensitive (the default).
|
|
|
|
Returns the index of the first item matched, or wxNOT\_FOUND.
|
|
|
|
% TODO
|
|
%\membersection{wxString::insert}\label{wxstringinsert}
|
|
% Wrong!
|
|
%\func{void}{insert}{\param{const wxString\&}{ str}, \param{size\_t}{ index}}
|
|
%
|
|
%Add new element at the given position.
|
|
%
|
|
\membersection{wxString::IsAscii}\label{wxstringisascii}
|
|
|
|
\constfunc{bool}{IsAscii}{\void}
|
|
|
|
Returns TRUE if the string contains only ASCII characters.
|
|
|
|
\membersection{wxString::IsEmpty}\label{wxstringisempty}
|
|
|
|
\constfunc{bool}{IsEmpty}{\void}
|
|
|
|
Returns TRUE if the string is empty.
|
|
|
|
\membersection{wxString::IsNull}\label{wxstringisnull}
|
|
|
|
\constfunc{bool}{IsNull}{\void}
|
|
|
|
Returns TRUE if the string is empty (same as \helpref{IsEmpty}{wxstringisempty}).
|
|
|
|
\membersection{wxString::IsNumber}\label{wxstringisnumber}
|
|
|
|
\constfunc{bool}{IsNumber}{\void}
|
|
|
|
Returns TRUE if the string is an integer (with possible sign).
|
|
|
|
\membersection{wxString::IsSameAs}\label{wxstringissameas}
|
|
|
|
\constfunc{bool}{IsSameAs}{\param{const char*}{ psz}, \param{bool}{ caseSensitive = TRUE}}
|
|
|
|
Test for string equality, case-sensitive (default) or not.
|
|
|
|
caseSensitive is TRUE by default (case matters).
|
|
|
|
Returns TRUE if strings are equal, FALSE otherwise.
|
|
|
|
See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas2}
|
|
|
|
\membersection{wxString::IsSameAs}\label{wxstringissameas2}
|
|
|
|
\constfunc{bool}{IsSameAs}{\param{char}{ c}, \param{bool}{ caseSensitive = TRUE}}
|
|
|
|
Test whether the string is equal to the single character {\it c}. The test is
|
|
case-sensitive if {\it caseSensitive} is TRUE (default) or not if it is FALSE.
|
|
|
|
Returns TRUE if the string is equal to the character, FALSE otherwise.
|
|
|
|
See also \helpref{Cmp}{wxstringcmp}, \helpref{CmpNoCase}{wxstringcmpnocase}, \helpref{IsSameAs}{wxstringissameas}
|
|
|
|
\membersection{wxString::IsWord}\label{wxstringisword}
|
|
|
|
\constfunc{bool}{IsWord}{\void}
|
|
|
|
Returns TRUE if the string is a word. TODO: what's the definition of a word?
|
|
|
|
\membersection{wxString::Last}\label{wxstringlast}
|
|
|
|
\constfunc{char}{Last}{\void}
|
|
|
|
Returns the last character.
|
|
|
|
\func{char\&}{Last}{\void}
|
|
|
|
Returns a reference to the last character (writable).
|
|
|
|
\membersection{wxString::Left}\label{wxstringleft}
|
|
|
|
\constfunc{wxString}{Left}{\param{size\_t}{ count}}
|
|
|
|
Returns the first {\it count} characters of the string.
|
|
|
|
\membersection{wxString::Len}\label{wxstringlen}
|
|
|
|
\constfunc{size\_t}{Len}{\void}
|
|
|
|
Returns the length of the string.
|
|
|
|
\membersection{wxString::Length}\label{wxstringlength}
|
|
|
|
\constfunc{size\_t}{Length}{\void}
|
|
|
|
Returns the length of the string (same as Len).
|
|
|
|
\membersection{wxString::Lower}\label{wxstringlower}
|
|
|
|
\constfunc{wxString}{Lower}{\void}
|
|
|
|
Returns this string converted to the lower case.
|
|
|
|
\membersection{wxString::LowerCase}\label{wxstringlowercase}
|
|
|
|
\func{void}{LowerCase}{\void}
|
|
|
|
Same as MakeLower.
|
|
|
|
\membersection{wxString::MakeLower}\label{wxstringmakelower}
|
|
|
|
\func{void}{MakeLower}{\void}
|
|
|
|
Converts all characters to lower case.
|
|
|
|
\membersection{wxString::MakeUpper}\label{wxstringmakeupper}
|
|
|
|
\func{void}{MakeUpper}{\void}
|
|
|
|
Converts all characters to upper case.
|
|
|
|
\membersection{wxString::Matches}\label{wxstringmatches}
|
|
|
|
\constfunc{bool}{Matches}{\param{const char*}{ szMask}}
|
|
|
|
Returns TRUE if the string contents matches a mask containing '*' and '?'.
|
|
|
|
\membersection{wxString::Mid}\label{wxstringmid}
|
|
|
|
\constfunc{wxString}{Mid}{\param{size\_t}{ first}, \param{size\_t}{ count = wxSTRING\_MAXLEN}}
|
|
|
|
Returns a substring starting at {\it first}, with length {\it count}, or the rest of
|
|
the string if {\it count} is the default value.
|
|
|
|
\membersection{wxString::Pad}\label{wxstringpad}
|
|
|
|
\func{wxString\&}{Pad}{\param{size\_t}{ count}, \param{char}{ pad = ' '}, \param{bool}{ fromRight = TRUE}}
|
|
|
|
Adds {\it count} copies of {\it pad} to the beginning, or to the end of the string (the default).
|
|
|
|
Removes spaces from the left or from the right (default).
|
|
|
|
\membersection{wxString::Prepend}\label{wxstringprepend}
|
|
|
|
\func{wxString\&}{Prepend}{\param{const wxString\&}{ str}}
|
|
|
|
Prepends {\it str} to this string, returning a reference to this string.
|
|
|
|
\membersection{wxString::Printf}\label{wxstringprintf}
|
|
|
|
\func{int}{Printf}{\param{const char* }{pszFormat}, \param{}{...}}
|
|
|
|
Similar to the standard function {\it sprintf()}. Returns the number of
|
|
characters written, or an integer less than zero on error.
|
|
|
|
{\bf NB:} This function will use a safe version of {\it vsprintf()} (usually called
|
|
{\it vsnprintf()}) whenever available to always allocate the buffer of correct
|
|
size. Unfortunately, this function is not available on all platforms and the
|
|
dangerous {\it vsprintf()} will be used then which may lead to buffer overflows.
|
|
|
|
\membersection{wxString::PrintfV}\label{wxstringprintfv}
|
|
|
|
\func{int}{PrintfV}{\param{const char* }{pszFormat}, \param{va\_list}{ argPtr}}
|
|
|
|
Similar to vprintf. Returns the number of characters written, or an integer less than zero
|
|
on error.
|
|
|
|
\membersection{wxString::Remove}\label{wxstringremove}
|
|
|
|
\func{wxString\&}{Remove}{\param{size\_t}{ pos}}
|
|
|
|
Same as Truncate. Removes the portion from {\it pos} to the end of the string.
|
|
|
|
\func{wxString\&}{Remove}{\param{size\_t}{ pos}, \param{size\_t}{ len}}
|
|
|
|
Removes the {\it len} characters from the string, starting at {\it pos}.
|
|
|
|
\membersection{wxString::RemoveLast}\label{wxstringremovelast}
|
|
|
|
\func{wxString\&}{RemoveLast}{\void}
|
|
|
|
Removes the last character.
|
|
|
|
\membersection{wxString::Replace}\label{wxstringreplace}
|
|
|
|
\func{size\_t}{Replace}{\param{const char*}{ szOld}, \param{const char*}{ szNew}, \param{bool}{ replaceAll = TRUE}}
|
|
|
|
Replace first (or all) occurrences of substring with another one.
|
|
|
|
{\it replaceAll}: global replace (default), or only the first occurrence.
|
|
|
|
Returns the number of replacements made.
|
|
|
|
\membersection{wxString::Right}\label{wxstringright}
|
|
|
|
\constfunc{wxString}{Right}{\param{size\_t}{ count}}
|
|
|
|
Returns the last {\it count} characters.
|
|
|
|
\membersection{wxString::SetChar}\label{wxstringsetchar}
|
|
|
|
\func{void}{SetChar}{\param{size\_t}{ n}, \param{char}{ch}}
|
|
|
|
Sets the character at position {\it n}.
|
|
|
|
\membersection{wxString::Shrink}\label{wxstringshrink}
|
|
|
|
\func{void}{Shrink}{\void}
|
|
|
|
Minimizes the string's memory. This can be useful after a call to
|
|
\helpref{Alloc()}{wxstringalloc} if too much memory were preallocated.
|
|
|
|
\membersection{wxString::sprintf}\label{wxstringsprintf}
|
|
|
|
\func{void}{sprintf}{\param{const char* }{ fmt}}
|
|
|
|
The same as Printf.
|
|
|
|
\membersection{wxString::StartsWith}\label{wxstringstartswith}
|
|
|
|
\constfunc{bool}{StartsWith}{\param{const wxChar }{*prefix}, \param{wxString }{*rest = NULL}}
|
|
|
|
This function can be used to test if the string starts with the specified
|
|
{\it prefix}. If it does, the function will return {\tt TRUE} and put the rest
|
|
of the string (i.e. after the prefix) into {\it rest} string if it is not
|
|
{\tt NULL}. Otherwise, the function returns {\tt FALSE} and doesn't modify the
|
|
{\it rest}.
|
|
|
|
\membersection{wxString::Strip}\label{wxstringstrip}
|
|
|
|
\begin{verbatim}
|
|
enum stripType {leading = 0x1, trailing = 0x2, both = 0x3};
|
|
\end{verbatim}
|
|
|
|
\constfunc{wxString}{Strip}{\param{stripType}{ s = trailing}}
|
|
|
|
Strip characters at the front and/or end. The same as Trim except that it
|
|
doesn't change this string.
|
|
|
|
\membersection{wxString::SubString}\label{wxstringsubstring}
|
|
|
|
\constfunc{wxString}{SubString}{\param{size\_t}{ from}, \param{size\_t}{ to}}
|
|
|
|
Deprecated, use \helpref{Mid}{wxstringmid} instead (but note that parameters
|
|
have different meaning).
|
|
|
|
Returns the part of the string between the indices {\it from} and {\it to}
|
|
inclusive.
|
|
|
|
\membersection{wxString::ToDouble}\label{wxstringtodouble}
|
|
|
|
\constfunc{bool}{ToDouble}{\param{double}{ *val}}
|
|
|
|
Attempts to convert the string to a floating point number. Returns TRUE on
|
|
success (the number is stored in the location pointed to by {\it val}) or FALSE
|
|
if the string does not represent such number.
|
|
|
|
\wxheading{See also}
|
|
|
|
\helpref{wxString::ToLong}{wxstringtolong},\\
|
|
\helpref{wxString::ToULong}{wxstringtoulong}
|
|
|
|
\membersection{wxString::ToLong}\label{wxstringtolong}
|
|
|
|
\constfunc{bool}{ToLong}{\param{long}{ *val}, \param{int }{base = $10$}}
|
|
|
|
Attempts to convert the string to a signed integer in base {\it base}. Returns
|
|
{\tt TRUE} on success in which case the number is stored in the location
|
|
pointed to by {\it val} or {\tt FALSE} if the string does not represent a
|
|
valid number in the given base.
|
|
|
|
The value of {\it base} must be comprised between $2$ and $36$, inclusive, or
|
|
be a special value $0$ which means that the usual rules of {\tt C} numbers are
|
|
applied: if the number starts with {\tt 0x} it is considered to be in base
|
|
$16$, if it starts with {\tt 0} - in base $8$ and in base $10$ otherwise. Note
|
|
that you may not want to specify the base $0$ if you are parsing the numbers
|
|
which may have leading zeroes as they can yield unexpected (to the user not
|
|
familiar with C) results.
|
|
|
|
\wxheading{See also}
|
|
|
|
\helpref{wxString::ToDouble}{wxstringtodouble},\\
|
|
\helpref{wxString::ToULong}{wxstringtoulong}
|
|
|
|
\membersection{wxString::ToULong}\label{wxstringtoulong}
|
|
|
|
\constfunc{bool}{ToULong}{\param{unsigned long}{ *val}, \param{int }{base = $10$}}
|
|
|
|
Attempts to convert the string to a ansigned integer in base {\it base}.
|
|
Returns {\tt TRUE} on success in which case the number is stored in the
|
|
location pointed to by {\it val} or {\tt FALSE} if the string does not
|
|
represent a valid number in the given base.
|
|
|
|
See \helpref{wxString::ToLong}{wxstringtolong} for the more detailed
|
|
description of the {\it base} parameter.
|
|
|
|
\wxheading{See also}
|
|
|
|
\helpref{wxString::ToDouble}{wxstringtodouble},\\
|
|
\helpref{wxString::ToLong}{wxstringtolong}
|
|
|
|
\membersection{wxString::Trim}\label{wxstringtrim}
|
|
|
|
\func{wxString\&}{Trim}{\param{bool}{ fromRight = TRUE}}
|
|
|
|
Removes spaces from the left or from the right (default).
|
|
|
|
\membersection{wxString::Truncate}\label{wxstringtruncate}
|
|
|
|
\func{wxString\&}{Truncate}{\param{size\_t}{ len}}
|
|
|
|
Truncate the string to the given length.
|
|
|
|
\membersection{wxString::UngetWriteBuf}\label{wxstringungetwritebuf}
|
|
|
|
\func{void}{UngetWriteBuf}{\void}
|
|
|
|
Puts the string back into a reasonable state, after
|
|
\rtfsp\helpref{wxString::GetWriteBuf}{wxstringgetwritebuf} was called.
|
|
|
|
\membersection{wxString::Upper}\label{wxstringupper}
|
|
|
|
\constfunc{wxString}{Upper}{\void}
|
|
|
|
Returns this string converted to upper case.
|
|
|
|
\membersection{wxString::UpperCase}\label{wxstringuppercase}
|
|
|
|
\func{void}{UpperCase}{\void}
|
|
|
|
The same as MakeUpper.
|
|
|
|
\membersection{wxString::operator!}\label{wxstringoperatornot}
|
|
|
|
\constfunc{bool}{operator!}{\void}
|
|
|
|
Empty string is FALSE, so !string will only return TRUE if the string is empty.
|
|
This allows the tests for NULLness of a {\it const char *} pointer and emptyness
|
|
of the string to look the same in the code and makes it easier to port old code
|
|
to wxString.
|
|
|
|
See also \helpref{IsEmpty()}{wxstringisempty}.
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\membersection{wxString::operator $=$}\label{wxstringoperatorassign}
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\func{wxString\&}{operator $=$}{\param{const wxString\&}{ str}}
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\func{wxString\&}{operator $=$}{\param{const char*}{ psz}}
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\func{wxString\&}{operator $=$}{\param{char}{ c}}
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\func{wxString\&}{operator $=$}{\param{const unsigned char*}{ psz}}
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\func{wxString\&}{operator $=$}{\param{const wchar\_t*}{ pwz}}
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Assignment: the effect of each operation is the same as for the corresponding
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constructor (see \helpref{wxString constructors}{wxstringconstruct}).
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\membersection{wxString::operator $+$}\label{wxstringoperatorplus}
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Concatenation: all these operators return a new strign equal to the sum of the
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operands.
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\func{wxString}{operator $+$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{wxString}{operator $+$}{\param{const wxString\&}{ x}, \param{const char*}{ y}}
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\func{wxString}{operator $+$}{\param{const wxString\&}{ x}, \param{char}{ y}}
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\func{wxString}{operator $+$}{\param{const char*}{ x}, \param{const wxString\&}{ y}}
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\membersection{wxString::operator $+=$}\label{wxstringplusequal}
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\func{void}{operator $+=$}{\param{const wxString\&}{ str}}
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\func{void}{operator $+=$}{\param{const char*}{ psz}}
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\func{void}{operator $+=$}{\param{char}{ c}}
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Concatenation in place: the argument is appended to the string.
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\membersection{wxString::operator []}\label{wxstringoperatorbracket}
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\func{char\&}{operator []}{\param{size\_t}{ i}}
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\func{char}{operator []}{\param{size\_t}{ i}}
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\func{char}{operator []}{\param{int}{ i}}
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Element extraction.
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\membersection{wxString::operator ()}\label{wxstringoperatorparenth}
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\func{wxString}{operator ()}{\param{size\_t}{ start}, \param{size\_t}{ len}}
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Same as Mid (substring extraction).
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\membersection{wxString::operator \cinsert}\label{wxstringoperatorout}
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\func{wxString\&}{operator \cinsert}{\param{const wxString\&}{ str}}
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\func{wxString\&}{operator \cinsert}{\param{const char*}{ psz}}
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\func{wxString\&}{operator \cinsert}{\param{char }{ch}}
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Same as $+=$.
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\func{wxString\&}{operator \cinsert}{\param{int}{ i}}
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\func{wxString\&}{operator \cinsert}{\param{float}{ f}}
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\func{wxString\&}{operator \cinsert}{\param{double}{ d}}
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These functions work as C++ stream insertion operators: they insert the given
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value into the string. Precision or format cannot be set using them, you can use
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\helpref{Printf}{wxstringprintf} for this.
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\membersection{wxString::operator \cextract}\label{wxstringoperatorin}
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\func{friend istream\&}{operator \cextract}{\param{istream\&}{ is}, \param{wxString\&}{ str}}
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Extraction from a stream.
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\membersection{wxString::operator const char*}\label{wxstringoperatorconstcharpt}
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\constfunc{}{operator const char*}{\void}
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Implicit conversion to a C string.
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\membersection{Comparison operators}\label{wxstringcomparison}
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\func{bool}{operator $==$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{bool}{operator $==$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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\func{bool}{operator $!=$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{bool}{operator $!=$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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\func{bool}{operator $>$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{bool}{operator $>$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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\func{bool}{operator $>=$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{bool}{operator $>=$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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\func{bool}{operator $<$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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\func{bool}{operator $<$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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|
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\func{bool}{operator $<=$}{\param{const wxString\&}{ x}, \param{const wxString\&}{ y}}
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|
\func{bool}{operator $<=$}{\param{const wxString\&}{ x}, \param{const char*}{ t}}
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|
\wxheading{Remarks}
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|
|
|
These comparisons are case-sensitive.
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|
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|
\section{\class{wxStringBuffer}}\label{wxstringbuffer}
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|
|
|
This tiny class allows to conveniently access the \helpref{wxString}{wxstring}
|
|
internal buffer as a writable pointer without any risk to forget to restore
|
|
the string to the usable state later.
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|
|
|
For example, assuming you have a low-level OS function called
|
|
{\tt GetMeaningOfLifeAsString(char *)} returning the value in the provided
|
|
buffer (which must be writable, of course) you might call it like this:
|
|
|
|
\begin{verbatim}
|
|
wxString theAnswer;
|
|
GetMeaningOfLifeAsString(wxStringBuffer(theAnswer, 1024));
|
|
if ( theAnswer != "42" )
|
|
{
|
|
wxLogError("Something is very wrong!");
|
|
}
|
|
\end{verbatim}
|
|
|
|
\wxheading{Derived from}
|
|
|
|
None
|
|
|
|
\wxheading{Include files}
|
|
|
|
<wx/string.h>
|
|
|
|
\latexignore{\rtfignore{\wxheading{Members}}}
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|
|
|
\membersection{wxStringBuffer::wxStringBuffer}
|
|
|
|
\func{}{wxStringBuffer}{\param{const wxString\& }{str}, \param{size\_t }{len}}
|
|
|
|
Constructs a writable string buffer object associated with the given string
|
|
and containing enough space for at least {\it len} characters. Basically, this
|
|
is equivalent to calling \helpref{GetWriteBuf}{wxstringgetwritebuf} and
|
|
saving the result.
|
|
|
|
\membersection{wxStringBuffer::\destruct{wxStringBuffer}}
|
|
|
|
\func{}{\destruct{wxStringBuffer}}{\void}
|
|
|
|
Restores the string passed to the constructor to the usable state by calling
|
|
\helpref{UngetWriteBuf}{wxstringungetwritebuf} on it.
|
|
|
|
\membersection{wxStringBuffer::operator wxChar *}
|
|
|
|
\constfunc{wxChar *}{operator wxChar *}{\void}
|
|
|
|
Returns the writable pointer to a buffer of the size at least equal to the
|
|
length specified in the constructor.
|
|
|
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|