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bc73d5aec8
wxWidgets/interface/wx/log.h
Vadim Zeitlin bc73d5aec8 Changed wxLog DoLogXXX() callbacks and introduced wxLogRecordInfo. 
The main logging callback is now DoLogRecord() with DoLogTextAtLevel() and
DoLogText() provided for convenience. The old DoLog() and DoLogString() are
still called but deprecated and their overloads taking wxString which were
only added in 2.9.0 are removed.

wxLogRecordInfo allows associating more information than just the time stamp
with the log record; for now only the logging thread id was added but more
fields will make their appearance soon.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61346 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2009-07-08 13:47:33 +00:00

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42 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: log.h
// Purpose: interface of wxLogWindow
// Author: wxWidgets team
// RCS-ID: $Id$
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
/**
Different standard log levels (you may also define your own) used with
by standard wxLog functions wxLogError(), wxLogWarning(), etc...
*/
enum wxLogLevelValues
{
wxLOG_FatalError, //!< program can't continue, abort immediately
wxLOG_Error, //!< a serious error, user must be informed about it
wxLOG_Warning, //!< user is normally informed about it but may be ignored
wxLOG_Message, //!< normal message (i.e. normal output of a non GUI app)
wxLOG_Status, //!< informational: might go to the status line of GUI app
wxLOG_Info, //!< informational message (a.k.a. 'Verbose')
wxLOG_Debug, //!< never shown to the user, disabled in release mode
wxLOG_Trace, //!< trace messages are also only enabled in debug mode
wxLOG_Progress, //!< used for progress indicator (not yet)
wxLOG_User = 100, //!< user defined levels start here
wxLOG_Max = 10000
};
/**
The type used to specify a log level.
Default values of ::wxLogLevel used by wxWidgets are contained in the
::wxLogLevelValues enumeration.
*/
typedef unsigned long wxLogLevel;
/**
Information about a log record (unit of the log output).
*/
struct wxLogRecordInfo
{
/// Time when the log message was generated.
time_t timestamp;
/**
Id of the thread in which the message was generated.
This field is only available if wxWidgets was built with threads
support (<code>wxUSE_THREADS == 1</code>).
@see wxThread::GetCurrentId()
*/
wxThreadIdType threadId;
};
/**
@class wxLogWindow
This class represents a background log window: to be precise, it collects all
log messages in the log frame which it manages but also passes them on to the
log target which was active at the moment of its creation. This allows you, for
example, to show all the log messages in a frame but still continue to process
them normally by showing the standard log dialog.
@library{wxbase}
@category{logging}
@see wxLogTextCtrl
*/
class wxLogWindow : public wxLogInterposer
{
public:
/**
Creates the log frame window and starts collecting the messages in it.
@param pParent
The parent window for the log frame, may be @NULL
@param szTitle
The title for the log frame
@param show
@true to show the frame initially (default), otherwise
Show() must be called later.
@param passToOld
@true to process the log messages normally in addition to
logging them in the log frame (default), @false to only log them in the
log frame.
*/
wxLogWindow(wxWindow* pParent, const wxString& szTitle, bool show = true,
bool passToOld = true);
/**
Returns the associated log frame window. This may be used to position or resize
it but use Show() to show or hide it.
*/
wxFrame* GetFrame() const;
/**
Called if the user closes the window interactively, will not be
called if it is destroyed for another reason (such as when program
exits).
Return @true from here to allow the frame to close, @false to
prevent this from happening.
@see OnFrameDelete()
*/
virtual bool OnFrameClose(wxFrame* frame);
/**
Called immediately after the log frame creation allowing for
any extra initializations.
*/
virtual void OnFrameCreate(wxFrame* frame);
/**
Called right before the log frame is going to be deleted: will
always be called unlike OnFrameClose().
*/
virtual void OnFrameDelete(wxFrame* frame);
/**
Shows or hides the frame.
*/
void Show(bool show = true);
};
/**
@class wxLogInterposerTemp
A special version of wxLogChain which uses itself as the new log target.
It forwards log messages to the previously installed one in addition to
processing them itself. Unlike wxLogInterposer, it doesn't delete the old
target which means it can be used to temporarily redirect log output.
As per wxLogInterposer, this class must be derived from to implement
wxLog::DoLog and/or wxLog::DoLogString methods.
@library{wxbase}
@category{logging}
*/
class wxLogInterposerTemp : public wxLogChain
{
public:
/**
The default constructor installs this object as the current active log target.
*/
wxLogInterposerTemp();
};
/**
@class wxLogChain
This simple class allows you to chain log sinks, that is to install a new sink but
keep passing log messages to the old one instead of replacing it completely as
wxLog::SetActiveTarget does.
It is especially useful when you want to divert the logs somewhere (for
example to a file or a log window) but also keep showing the error messages
using the standard dialogs as wxLogGui does by default.
Example of usage:
@code
wxLogChain *logChain = new wxLogChain(new wxLogStderr);
// all the log messages are sent to stderr and also processed as usually
...
// don't delete logChain directly as this would leave a dangling
// pointer as active log target, use SetActiveTarget() instead
delete wxLog::SetActiveTarget(...something else or NULL...);
@endcode
@library{wxbase}
@category{logging}
*/
class wxLogChain : public wxLog
{
public:
/**
Sets the specified @c logger (which may be @NULL) as the default log
target but the log messages are also passed to the previous log target if any.
*/
wxLogChain(wxLog* logger);
/**
Destroys the previous log target.
*/
virtual ~wxLogChain();
/**
Detaches the old log target so it won't be destroyed when the wxLogChain object
is destroyed.
*/
void DetachOldLog();
/**
Returns the pointer to the previously active log target (which may be @NULL).
*/
wxLog* GetOldLog() const;
/**
Returns @true if the messages are passed to the previously active log
target (default) or @false if PassMessages() had been called.
*/
bool IsPassingMessages() const;
/**
By default, the log messages are passed to the previously active log target.
Calling this function with @false parameter disables this behaviour
(presumably temporarily, as you shouldn't use wxLogChain at all otherwise) and
it can be reenabled by calling it again with @a passMessages set to @true.
*/
void PassMessages(bool passMessages);
/**
Sets another log target to use (may be @NULL).
The log target specified in the wxLogChain(wxLog*) constructor or in a
previous call to this function is deleted.
This doesn't change the old log target value (the one the messages are
forwarded to) which still remains the same as was active when wxLogChain
object was created.
*/
void SetLog(wxLog* logger);
};
/**
@class wxLogGui
This is the default log target for the GUI wxWidgets applications.
Please see @ref overview_log_customize for explanation of how to change the
default log target.
An object of this class is used by default to show the log messages created
by using wxLogMessage(), wxLogError() and other logging functions. It
doesn't display the messages logged by them immediately however but
accumulates all messages logged during an event handler execution and then
shows them all at once when its Flush() method is called during the idle
time processing. This has the important advantage of showing only a single
dialog to the user even if several messages were logged because of a single
error as it often happens (e.g. a low level function could log a message
because it failed to open a file resulting in its caller logging another
message due to the failure of higher level operation requiring the use of
this file). If you need to force the display of all previously logged
messages immediately you can use wxLog::FlushActive() to force the dialog
display.
Also notice that if an error message is logged when several informative
messages had been already logged before, the informative messages are
discarded on the assumption that they are not useful -- and may be
confusing and hence harmful -- any more after the error. The warning
and error messages are never discarded however and any informational
messages logged after the first error one are also kept (as they may
contain information about the error recovery). You may override DoLog()
method to change this behaviour.
At any rate, it is possible that that several messages were accumulated
before this class Flush() method is called. If this is the case, Flush()
uses a custom dialog which shows the last message directly and allows the
user to view the previously logged ones by expanding the "Details"
wxCollapsiblePane inside it. This custom dialog also provides the buttons
for copying the log messages to the clipboard and saving them to a file.
However if only a single message is present when Flush() is called, just a
wxMessageBox() is used to show it. This has the advantage of being closer
to the native behaviour but it doesn't give the user any possibility to
copy or save the message (except for the recent Windows versions where @c
Ctrl-C may be pressed in the message box to copy its contents to the
clipboard) so you may want to override DoShowSingleMessage() to customize
wxLogGui -- the dialogs sample shows how to do this.
@library{wxcore}
@category{logging}
*/
class wxLogGui : public wxLog
{
public:
/**
Default constructor.
*/
wxLogGui();
/**
Presents the accumulated log messages, if any, to the user.
This method is called during the idle time and should show any messages
accumulated in wxLogGui#m_aMessages field to the user.
*/
virtual void Flush();
protected:
/**
Returns the appropriate title for the dialog.
The title is constructed from wxApp::GetAppDisplayName() and the
severity string (e.g. "error" or "warning") appropriate for the current
wxLogGui#m_bErrors and wxLogGui#m_bWarnings values.
*/
wxString GetTitle() const;
/**
Returns wxICON_ERROR, wxICON_WARNING or wxICON_INFORMATION depending on
the current maximal severity.
This value is suitable to be used in the style parameter of
wxMessageBox() function.
*/
int GetSeverityIcon() const;
/**
Forgets all the currently stored messages.
If you override Flush() (and don't call the base class version), you
must call this method to avoid messages being logged over and over
again.
*/
void Clear();
/**
Method called by Flush() to show a single log message.
This function can be overridden to show the message in a different way.
By default a simple wxMessageBox() call is used.
@param message
The message to show (it can contain multiple lines).
@param title
The suggested title for the dialog showing the message, see
GetTitle().
@param style
One of @c wxICON_XXX constants, see GetSeverityIcon().
*/
virtual void DoShowSingleLogMessage(const wxString& message,
const wxString& title,
int style);
/**
Method called by Flush() to show multiple log messages.
This function can be overridden to show the messages in a different way.
By default a special log dialog showing the most recent message and
allowing the user to expand it to view the previously logged ones is
used.
@param messages
Array of messages to show; it contains more than one element.
@param severities
Array of message severities containing @c wxLOG_XXX values.
@param times
Array of time_t values indicating when each message was logged.
@param title
The suggested title for the dialog showing the message, see
GetTitle().
@param style
One of @c wxICON_XXX constants, see GetSeverityIcon().
*/
virtual void DoShowMultipleLogMessages(const wxArrayString& messages,
const wxArrayInt& severities,
const wxArrayLong& times,
const wxString& title,
int style);
/**
All currently accumulated messages.
This array may be empty if no messages were logged.
@see m_aSeverity, m_aTimes
*/
wxArrayString m_aMessages;
/**
The severities of each logged message.
This array is synchronized with wxLogGui#m_aMessages, i.e. the n-th
element of this array corresponds to the severity of the n-th message.
The possible severity values are @c wxLOG_XXX constants, e.g.
wxLOG_Error, wxLOG_Warning, wxLOG_Message etc.
*/
wxArrayInt m_aSeverity;
/**
The time stamps of each logged message.
The elements of this array are time_t values corresponding to the time
when the message was logged.
*/
wxArrayLong m_aTimes;
/**
True if there any error messages.
*/
bool m_bErrors;
/**
True if there any warning messages.
If both wxLogGui#m_bErrors and this member are false, there are only
informational messages to be shown.
*/
bool m_bWarnings;
/**
True if there any messages to be shown to the user.
This variable is used instead of simply checking whether
wxLogGui#m_aMessages array is empty to allow blocking further calls to
Flush() while a log dialog is already being shown, even if the messages
array hasn't been emptied yet.
*/
bool m_bHasMessages;
};
/**
@class wxLogStream
This class can be used to redirect the log messages to a C++ stream.
Please note that this class is only available if wxWidgets was compiled with
the standard iostream library support (@c wxUSE_STD_IOSTREAM must be on).
@library{wxbase}
@category{logging}
@see wxLogStderr, wxStreamToTextRedirector
*/
class wxLogStream : public wxLog
{
public:
/**
Constructs a log target which sends all the log messages to the given
output stream. If it is @NULL, the messages are sent to @c cerr.
*/
wxLogStream(std::ostream *ostr = NULL);
};
/**
@class wxLogStderr
This class can be used to redirect the log messages to a C file stream (not to
be confused with C++ streams).
It is the default log target for the non-GUI wxWidgets applications which
send all the output to @c stderr.
@library{wxbase}
@category{logging}
@see wxLogStream
*/
class wxLogStderr : public wxLog
{
public:
/**
Constructs a log target which sends all the log messages to the given
@c FILE. If it is @NULL, the messages are sent to @c stderr.
*/
wxLogStderr(FILE* fp = NULL);
};
/**
@class wxLogBuffer
wxLogBuffer is a very simple implementation of log sink which simply collects
all the logged messages in a string (except the debug messages which are output
in the usual way immediately as we're presumably not interested in collecting
them for later). The messages from different log function calls are separated
by the new lines.
All the messages collected so far can be shown to the user (and the current
buffer cleared) by calling the overloaded wxLogBuffer::Flush method.
@library{wxbase}
@category{logging}
*/
class wxLogBuffer : public wxLog
{
public:
/**
The default ctor does nothing.
*/
wxLogBuffer();
/**
Shows all the messages collected so far to the user (using a message box in the
GUI applications or by printing them out to the console in text mode) and
clears the internal buffer.
*/
virtual void Flush();
/**
Returns the current buffer contains. Messages from different log function calls
are separated with the new lines in the buffer.
The buffer can be cleared by Flush() which will also show the current
contents to the user.
*/
const wxString& GetBuffer() const;
};
/**
@class wxLogInterposer
A special version of wxLogChain which uses itself as the new log target.
It forwards log messages to the previously installed one in addition to
processing them itself.
Unlike wxLogChain which is usually used directly as is, this class must be
derived from to implement wxLog::DoLog and/or wxLog::DoLogString methods.
wxLogInterposer destroys the previous log target in its destructor.
If you don't want this to happen, use wxLogInterposerTemp instead.
@library{wxbase}
@category{logging}
*/
class wxLogInterposer : public wxLogChain
{
public:
/**
The default constructor installs this object as the current active log target.
*/
wxLogInterposer();
};
/**
@class wxLogTextCtrl
Using these target all the log messages can be redirected to a text control.
The text control must have been created with @c wxTE_MULTILINE style by the
caller previously.
@library{wxbase}
@category{logging}
@see wxTextCtrl, wxStreamToTextRedirector
*/
class wxLogTextCtrl : public wxLog
{
public:
/**
Constructs a log target which sends all the log messages to the given text
control. The @a textctrl parameter cannot be @NULL.
*/
wxLogTextCtrl(wxTextCtrl* pTextCtrl);
};
/**
@class wxLog
wxLog class defines the interface for the @e log targets used by wxWidgets
logging functions as explained in the @ref overview_log.
The only situations when you need to directly use this class is when you want
to derive your own log target because the existing ones don't satisfy your
needs. Another case is if you wish to customize the behaviour of the standard
logging classes (all of which respect the wxLog settings): for example, set
which trace messages are logged and which are not or change (or even remove
completely) the timestamp on the messages.
Otherwise, it is completely hidden behind the @e wxLogXXX() functions and
you may not even know about its existence.
@note For console-mode applications, the default target is wxLogStderr, so
that all @e wxLogXXX() functions print on @c stderr when @c wxUSE_GUI = 0.
@section log_derivingyours Deriving your own log target
There are two functions which must be implemented by any derived class to
actually process the log messages: DoLog() and DoLogString().
The second function receives a string which just has to be output in some way
and the easiest way to write a new log target is to override just this function
in the derived class.
If more control over the output format is needed, then the first function must
be overridden which allows to construct custom messages depending on the log level
or even do completely different things depending on the message severity
(for example, throw away all messages except warnings and errors, show warnings
on the screen and forward the error messages to the user's (or programmer's) cell
phone - maybe depending on whether the timestamp tells us if it is day or
night in the current time zone).
There also functions to support message buffering. Why are they needed?
Some of wxLog implementations, most notably the standard wxLogGui class,
buffer the messages (for example, to avoid showing the user a zillion of modal
message boxes one after another -- which would be really annoying).
Flush() shows them all and clears the buffer contents.
This function doesn't do anything if the buffer is already empty.
See also:
@li Flush()
@li FlushActive()
@section log_tracemasks Using trace masks
The functions below allow some limited customization of wxLog behaviour
without writing a new log target class (which, aside from being a matter of
several minutes, allows you to do anything you want).
The verbose messages are the trace messages which are not disabled in the
release mode and are generated by wxLogVerbose().
They are not normally shown to the user because they present little interest,
but may be activated, for example, in order to help the user find some program
problem.
As for the (real) trace messages, their handling depends on the currently
enabled trace masks: if AddTraceMask() was called for the mask of the given
message, it will be logged, otherwise nothing happens.
For example,
@code
wxLogTrace( wxTRACE_OleCalls, "IFoo::Bar() called" );
@endcode
will log the message if it was preceded by:
@code
wxLog::AddTraceMask( wxTRACE_OleCalls);
@endcode
The standard trace masks are given in wxLogTrace() documentation.
Finally, the @e wxLog::DoLog() function automatically prepends a time stamp
to all the messages. The format of the time stamp may be changed: it can be
any string with % specifications fully described in the documentation of the
standard @e strftime() function. For example, the default format is
"[%d/%b/%y %H:%M:%S] " which gives something like "[17/Sep/98 22:10:16] "
(without quotes) for the current date. Setting an empty string as the time
format or calling the shortcut wxLog::DisableTimestamp(), disables timestamping
of the messages completely.
See also
@li AddTraceMask()
@li RemoveTraceMask()
@li ClearTraceMasks()
@li GetTraceMasks()
@li IsAllowedTraceMask()
@li SetVerbose()
@li GetVerbose()
@li SetTimestamp()
@li GetTimestamp()
@li SetTraceMask()
@li GetTraceMask()
@li SetRepetitionCounting()
@li GetRepetitionCounting()
@note
Timestamping is disabled for Visual C++ users in debug builds by
default because otherwise it would be impossible to directly go to the line
from which the log message was generated by simply clicking in the debugger
window on the corresponding error message. If you wish to enable it, please
use SetTimestamp() explicitly.
@section log_target Manipulating the log target
The functions in this section work with and manipulate the active log
target.
Get/Set methods are used to install/query the current active target and,
finally, DontCreateOnDemand() disables the automatic creation of a standard
log target if none actually exists. It is only useful when the application
is terminating and shouldn't be used in other situations because it may
easily lead to a loss of messages.
See also:
@li GetActiveTarget()
@li SetActiveTarget()
@li DontCreateOnDemand()
@li Suspend()
@li Resume()
@library{wxcore}
@category{logging}
@see @ref overview_log
*/
class wxLog
{
public:
/**
Add the @a mask to the list of allowed masks for wxLogTrace().
@see RemoveTraceMask(), GetTraceMasks()
*/
static void AddTraceMask(const wxString& mask);
/**
Removes all trace masks previously set with AddTraceMask().
@see RemoveTraceMask()
*/
static void ClearTraceMasks();
/**
Instructs wxLog to not create new log targets on the fly if there is none
currently. (Almost) for internal use only: it is supposed to be called by the
application shutdown code.
Note that this function also calls ClearTraceMasks().
*/
static void DontCreateOnDemand();
/**
Shows all the messages currently in buffer and clears it.
If the buffer is already empty, nothing happens.
*/
virtual void Flush();
/**
Flushes the current log target if any, does nothing if there is none.
@see Flush()
*/
static void FlushActive();
/**
Returns the pointer to the active log target (may be @NULL).
*/
static wxLog* GetActiveTarget();
/**
Returns the current log level limit.
*/
static wxLogLevel GetLogLevel();
/**
Returns whether the repetition counting mode is enabled.
*/
static bool GetRepetitionCounting();
/**
Returns the current timestamp format string.
*/
static const wxString& GetTimestamp();
/**
@deprecated
Returns the current trace mask, see Customization() section for details.
*/
static wxTraceMask GetTraceMask();
/**
Returns the currently allowed list of string trace masks.
@see AddTraceMask().
*/
static const wxArrayString& GetTraceMasks();
/**
Returns whether the verbose mode is currently active.
*/
static bool GetVerbose();
/**
Returns @true if the @a mask is one of allowed masks for wxLogTrace().
See also: AddTraceMask(), RemoveTraceMask()
*/
static bool IsAllowedTraceMask(const wxString& mask);
/**
Remove the @a mask from the list of allowed masks for
wxLogTrace().
@see AddTraceMask()
*/
static void RemoveTraceMask(const wxString& mask);
/**
Resumes logging previously suspended by a call to Suspend().
All messages logged in the meanwhile will be flushed soon.
*/
static void Resume();
/**
Sets the specified log target as the active one.
Returns the pointer to the previous active log target (may be @NULL).
To suppress logging use a new instance of wxLogNull not @NULL. If the
active log target is set to @NULL a new default log target will be
created when logging occurs.
*/
static wxLog* SetActiveTarget(wxLog* logtarget);
/**
Specifies that log messages with level greater (numerically) than
@a logLevel should be ignored and not sent to the active log target.
*/
static void SetLogLevel(wxLogLevel logLevel);
/**
Enables logging mode in which a log message is logged once, and in case exactly
the same message successively repeats one or more times, only the number of
repetitions is logged.
*/
static void SetRepetitionCounting(bool repetCounting = true);
/**
Sets the timestamp format prepended by the default log targets to all
messages. The string may contain any normal characters as well as %
prefixed format specificators, see @e strftime() manual for details.
Passing an empty string to this function disables message time stamping.
*/
static void SetTimestamp(const wxString& format);
/**
Disables time stamping of the log messages.
@since 2.9.0
*/
static void DisableTimestamp();
/**
@deprecated
Sets the trace mask, see @ref log_tracemasks section for details.
*/
static void SetTraceMask(wxTraceMask mask);
/**
Activates or deactivates verbose mode in which the verbose messages are
logged as the normal ones instead of being silently dropped.
*/
static void SetVerbose(bool verbose = true);
/**
Suspends the logging until Resume() is called.
Note that the latter must be called the same number of times as the former
to undo it, i.e. if you call Suspend() twice you must call Resume() twice as well.
Note that suspending the logging means that the log sink won't be be flushed
periodically, it doesn't have any effect if the current log target does the
logging immediately without waiting for Flush() to be called (the standard
GUI log target only shows the log dialog when it is flushed, so Suspend()
works as expected with it).
@see Resume(), wxLogNull
*/
static void Suspend();
/**
Log the given record.
This function should only be called from the DoLog() implementations in
the derived classes if they need to call DoLogRecord() on another log
object (they can, of course, just use wxLog::DoLogRecord() call syntax
to call it on the object itself). It should not be used for logging new
messages which can be only sent to the currently active logger using
OnLog() which also checks if the logging (for this level) is enabled
while this method just directly calls DoLog().
Example of use of this class from wxLogChain:
@code
void wxLogChain::DoLogRecord(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info)
{
// let the previous logger show it
if ( m_logOld && IsPassingMessages() )
m_logOld->LogRecord(level, msg, info);
// and also send it to the new one
if ( m_logNew && m_logNew != this )
m_logNew->LogRecord(level, msg, info);
}
@endcode
@since 2.9.1
*/
void LogRecord(wxLogLevel level, const wxString& msg, time_t timestamp);
protected:
/**
@name Logging callbacks.
The functions which should be overridden by custom log targets.
When defining a new log target, you have a choice between overriding
DoLogRecord(), which provides maximal flexibility, DoLogTextAtLevel()
which can be used if you don't intend to change the default log
messages formatting but want to handle log messages of different levels
differently or, in the simplest case, DoLogText().
*/
//@{
/**
Called to created log a new record.
Any log message created by wxLogXXX() functions is passed to this
method of the active log target. The default implementation prepends
the timestamp and, for some log levels (e.g. error and warning), the
corresponding prefix to @a msg and passes it to DoLogTextAtLevel().
You may override this method to implement custom formatting of the
log messages or to implement custom filtering of log messages (e.g. you
could discard all log messages coming from the given source file).
*/
virtual void DoLogRecord(wxLogLevel level,
const wxString& msg,
const wxLogRecordInfo& info);
/**
Called to log the specified string at given level.
The base class versions logs debug and trace messages on the system
default debug output channel and passes all the other messages to
DoLogText().
*/
virtual void DoLogTextAtLevel(wxLogLevel level, const wxString& msg);
/**
Called to log the specified string.
A simple implementation might just send the string to @c stdout or
@c stderr or save it in a file (of course, the already existing
wxLogStderr can be used for this).
The base class version of this function asserts so it must be
overridden if you don't override DoLogRecord() or DoLogTextAtLevel().
*/
virtual void DoLogText(const wxString& msg);
//@}
};
/**
@class wxLogNull
This class allows you to temporarily suspend logging. All calls to the log
functions during the life time of an object of this class are just ignored.
In particular, it can be used to suppress the log messages given by wxWidgets
itself but it should be noted that it is rarely the best way to cope with this
problem as @b all log messages are suppressed, even if they indicate a
completely different error than the one the programmer wanted to suppress.
For instance, the example of the overview:
@code
wxFile file;
// wxFile.Open() normally complains if file can't be opened, we don't want it
{
wxLogNull logNo;
if ( !file.Open("bar") )
... process error ourselves ...
} // ~wxLogNull called, old log sink restored
wxLogMessage("..."); // ok
@endcode
would be better written as:
@code
wxFile file;
// don't try to open file if it doesn't exist, we are prepared to deal with
// this ourselves - but all other errors are not expected
if ( wxFile::Exists("bar") )
{
// gives an error message if the file couldn't be opened
file.Open("bar");
}
else
{
...
}
@endcode
@library{wxbase}
@category{logging}
*/
class wxLogNull
{
public:
/**
Suspends logging.
*/
wxLogNull();
/**
Resumes logging.
*/
~wxLogNull();
};
// ============================================================================
// Global functions/macros
// ============================================================================
/** @addtogroup group_funcmacro_log */
//@{
/**
This function shows a message to the user in a safe way and should be safe
to call even before the application has been initialized or if it is
currently in some other strange state (for example, about to crash). Under
Windows this function shows a message box using a native dialog instead of
wxMessageBox() (which might be unsafe to call), elsewhere it simply prints
the message to the standard output using the title as prefix.
@param title
The title of the message box shown to the user or the prefix of the
message string.
@param text
The text to show to the user.
@see wxLogFatalError()
@header{wx/log.h}
*/
void wxSafeShowMessage(const wxString& title, const wxString& text);
/**
Returns the error code from the last system call. This function uses
@c errno on Unix platforms and @c GetLastError under Win32.
@see wxSysErrorMsg(), wxLogSysError()
@header{wx/log.h}
*/
unsigned long wxSysErrorCode();
/**
Returns the error message corresponding to the given system error code. If
@a errCode is 0 (default), the last error code (as returned by
wxSysErrorCode()) is used.
@see wxSysErrorCode(), wxLogSysError()
@header{wx/log.h}
*/
const wxChar* wxSysErrorMsg(unsigned long errCode = 0);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
For all normal, informational messages. They also appear in a message box
by default (but it can be changed).
@header{wx/log.h}
*/
void wxLogMessage(const char* formatString, ... );
void wxVLogMessage(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
For verbose output. Normally, it is suppressed, but might be activated if
the user wishes to know more details about the program progress (another,
but possibly confusing name for the same function could be @c wxLogInfo).
@header{wx/log.h}
*/
void wxLogVerbose(const char* formatString, ... );
void wxVLogVerbose(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
For warnings - they are also normally shown to the user, but don't
interrupt the program work.
@header{wx/log.h}
*/
void wxLogWarning(const char* formatString, ... );
void wxVLogWarning(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Like wxLogError(), but also terminates the program with the exit code 3.
Using @e abort() standard function also terminates the program with this
exit code.
@header{wx/log.h}
*/
void wxLogFatalError(const char* formatString, ... );
void wxVLogFatalError(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
The functions to use for error messages, i.e. the messages that must be
shown to the user. The default processing is to pop up a message box to
inform the user about it.
@header{wx/log.h}
*/
void wxLogError(const char* formatString, ... );
void wxVLogError(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Like wxLogDebug(), trace functions only do something in debug builds and
expand to nothing in the release one. The reason for making it a separate
function is that usually there are a lot of trace messages, so it might
make sense to separate them from other debug messages.
wxLogTrace(const char*,const char*,...) and can be used instead of
wxLogDebug() if you would like to be able to separate trace messages into
different categories which can be enabled or disabled with
wxLog::AddTraceMask() and wxLog::RemoveTraceMask().
@header{wx/log.h}
*/
void wxLogTrace(const char *mask, const char* formatString, ... );
void wxVLogTrace(const char *mask, const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Like wxLogDebug(), trace functions only do something in debug builds and
expand to nothing in the release one. The reason for making it a separate
function is that usually there are a lot of trace messages, so it might
make sense to separate them from other debug messages.
In this version of wxLogTrace(), trace messages can be separated into
different categories and calls using this function only log the message if
the given @a mask is currently enabled in wxLog. This lets you selectively
trace only some operations and not others by enabling the desired trace
masks with wxLog::AddTraceMask() or by setting the
@ref overview_envvars "@c WXTRACE environment variable".
The predefined string trace masks used by wxWidgets are:
@beginDefList
@itemdef{ wxTRACE_MemAlloc, Trace memory allocation (new/delete) }
@itemdef{ wxTRACE_Messages, Trace window messages/X callbacks }
@itemdef{ wxTRACE_ResAlloc, Trace GDI resource allocation }
@itemdef{ wxTRACE_RefCount, Trace various ref counting operations }
@itemdef{ wxTRACE_OleCalls, Trace OLE method calls (Win32 only) }
@endDefList
@note Since both the mask and the format string are strings, this might
lead to function signature confusion in some cases: if you intend to
call the format string only version of wxLogTrace(), add a "%s"
format string parameter and then supply a second string parameter for
that "%s", the string mask version of wxLogTrace() will erroneously
get called instead, since you are supplying two string parameters to
the function. In this case you'll unfortunately have to avoid having
two leading string parameters, e.g. by adding a bogus integer (with
its "%d" format string).
@header{wx/log.h}
*/
void wxLogTrace(const char* mask, const char* formatString, ... );
void wxVLogTrace(const char* mask,
const char* formatString,
va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Like wxLogDebug(), trace functions only do something in debug builds and
expand to nothing in the release one. The reason for making it a separate
function is that usually there are a lot of trace messages, so it might
make sense to separate them from other debug messages.
@deprecated
This version of wxLogTrace() only logs the message if all the bits
corresponding to the @a mask are set in the wxLog trace mask which can be
set by calling wxLog::SetTraceMask(). This version is less flexible than
wxLogTrace(const char*,const char*,...) because it doesn't allow defining
the user trace masks easily. This is why it is deprecated in favour of
using string trace masks.
The following bitmasks are defined for wxTraceMask:
@beginDefList
@itemdef{ wxTraceMemAlloc, Trace memory allocation (new/delete) }
@itemdef{ wxTraceMessages, Trace window messages/X callbacks }
@itemdef{ wxTraceResAlloc, Trace GDI resource allocation }
@itemdef{ wxTraceRefCount, Trace various ref counting operations }
@itemdef{ wxTraceOleCalls, Trace OLE method calls (Win32 only) }
@endDefList
@header{wx/log.h}
*/
void wxLogTrace(wxTraceMask mask, const char* formatString, ... );
void wxVLogTrace(wxTraceMask mask, const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
The right functions for debug output. They only do something in debug mode
(when the preprocessor symbol @c __WXDEBUG__ is defined) and expand to
nothing in release mode (otherwise).
@header{wx/log.h}
*/
void wxLogDebug(const char* formatString, ... );
void wxVLogDebug(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Messages logged by this function will appear in the statusbar of the
@a frame or of the top level application window by default (i.e. when using
the second version of the functions).
If the target frame doesn't have a statusbar, the message will be lost.
@header{wx/log.h}
*/
void wxLogStatus(wxFrame* frame, const char* formatString, ... );
void wxVLogStatus(wxFrame* frame, const char* formatString, va_list argPtr);
void wxLogStatus(const char* formatString, ... );
void wxVLogStatus(const char* formatString, va_list argPtr);
//@}
/** @addtogroup group_funcmacro_log */
//@{
/**
Mostly used by wxWidgets itself, but might be handy for logging errors
after system call (API function) failure. It logs the specified message
text as well as the last system error code (@e errno or @e ::GetLastError()
depending on the platform) and the corresponding error message. The second
form of this function takes the error code explicitly as the first
argument.
@see wxSysErrorCode(), wxSysErrorMsg()
@header{wx/log.h}
*/
void wxLogSysError(const char* formatString, ... );
void wxVLogSysError(const char* formatString, va_list argPtr);
//@}
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