wxWidgets/docs/latex/wx/stream.tex

\section{\class{wxStreamBuffer}}\label{wxstreambuffer}

\wxheading{Derived from}

None

\wxheading{See also}

\helpref{wxStreamBase}{wxstreambase}

% ---------------------------------------------------------------------------
% Members
% ---------------------------------------------------------------------------
\latexignore{\rtfignore{\wxheading{Members}}}

% -----------
% ctor & dtor
% -----------
\membersection{wxStreamBuffer::wxStreamBuffer}

\func{}{wxStreamBuffer}{\param{wxStreamBase\&}{ stream}, \param{BufMode}{ mode}}

Constructor, creates a new stream buffer using \it{stream} as a parent stream
and \it{mode} as the IO mode. \it{mode} can be: wxStreamBuffer::read,
wxStreamBuffer::write, wxStreamBuffer::read\_write.

\membersection{wxStreamBuffer::wxStreamBuffer}

\func{}{wxStreamBuffer}{\param{BufMode}{ mode}}

Constructor, creates a new empty stream buffer which won't flush any data
to a stream. \it{mode} specifies the type of the buffer (read, write, read\_write).

\membersection{wxStreamBuffer::wxStreamBuffer}

\func{}{wxStreamBuffer}{\param{const wxStreamBase\&}{ buffer}}

Constructor, creates a new stream buffer from the specified stream \it{buffer}.

\membersection{wxStreamBuffer::\destruct{wxStreamBuffer}}

\func{}{wxStreamBuffer}{\destruct{wxStreamBuffer}}

Destructor, destroys the stream buffer.

% -----------
% Filtered IO
% -----------
\membersection{wxStreamBuffer::Read}\label{wxstreambufread}

\func{size\_t}{Read}{\param{void *}{buffer}, \param{size\_t }{size}}

Reads a block of the specified \it{size} and stores datas in \it{buffer}.

\wxheading{Return value}

It returns the real read size. If returned size is different of the specified 
\it{size}, an error occured and should be tested using 
\helpref{LastError}{wxstreambaselasterror}.

\membersection{wxStreamBuffer::Read}\label{wxstreambufreadbuf}

\func{size\_t}{Read}{\param{wxStreamBuffer *}{buffer}}

Reads a \it{buffer}. The function returns when \it{buffer} is full or
when there aren't datas anymore in the current buffer.

\membersection{wxStreamBuffer::Write}

\func{size\_t}{Write}{\param{const void *}{buffer}, \param{size\_t }{size}}

Writes a block of the specified \it{size} using datas of \it{buffer}.

\membersection{wxStreamBuffer::Write}

\func{size\_t}{Write}{\param{wxStreamBuffer *}{buffer}}

See \helpref{Read}{wxstreambufreadbuf}

\membersection{wxStreamBuffer::WriteBack}

\func{size\_t}{WriteBack}{\param{const char*}{ buffer}, \param{size\_t}{ size}}

This function is only useful in ``read'' mode. It puts the specified \it{buffer}
in the input queue of the stream buf. By this way, the next
\helpref{Read}{wxstreambufread} call will first use these datas.

\membersection{wxStreamBuffer::WriteBack}

\func{size\_t}{WriteBack}{\param{char }{c}}

As for the previous function, it puts the specified byte in the input queue of the
stream buffer.

\membersection{wxStreamBuffer::GetChar}

\func{char}{GetChar}{\void}

Gets a single char from the stream buffer.

\membersection{wxStreamBuffer::PutChar}

\func{void}{PutChar}{\param{char }{c}}

Puts a single char to the stream buffer.

\membersection{wxStreamBuffer::Tell}

\constfunc{off\_t}{Tell}{\void}

Gets the current position in the \it{stream}.

\membersection{wxStreamBuffer::Seek}\label{wxstreambufferseek}

\func{off\_t}{Seek}{\param{off\_t }{pos}, \param{wxSeekMode }{mode}}

Changes the current position. (TODO)

% --------------
% Buffer control
% --------------
\membersection{wxStreamBuffer::ResetBuffer}

\func{void}{ResetBuffer}{\void}

Frees all internal buffers and resets to initial state all variables.

\membersection{wxStreamBuffer::SetBufferIO}

\func{void}{SetBufferIO}{\param{char*}{ buffer\_start}, \param{char*}{ buffer\_end}}

Specifies which pointers to use for stream buffering. You need to pass a pointer on the
start of the buffer end and another on the end.

\membersection{wxStreamBuffer::SetBufferIO}

\func{void}{SetBufferIO}{\param{size\_t}{ bufsize}}

Changes the size of the current IO buffer.

\membersection{wxStreamBuffer::GetBufferStart}

\constfunc{char *}{GetBufferStart}{\void}

Returns a pointer on the start of the stream buffer.

\membersection{wxStreamBuffer::GetBufferEnd}

\constfunc{char *}{GetBufferEnd}{\void}

Returns a pointer on the end of the stream buffer.

\membersection{wxStreamBuffer::GetBufferPos}

\constfunc{char *}{GetBufferPos}{\void}

Returns a pointer on the current position of the stream buffer.

\membersection{wxStreamBuffer::GetIntPosition}

\constfunc{off\_t}{GetIntPosition}{\void}

Returns the current position in the stream buffer.

\membersection{wxStreamBuffer::SetIntPosition}

\func{void}{SetIntPosition}{\void}

Sets the current position in the stream buffer.

\membersection{wxStreamBuffer::GetLastAccess}

\constfunc{size\_t}{GetLastAccess}{\void}

Returns the amount of bytes read during the last IO call to the parent stream.

\membersection{wxStreamBuffer::Fixed}

\func{void}{Fixed}{\param{bool}{ fixed}}

Toggles the fixed flag. Usually this flag is toggled at the same time as 
\it{flushable}. This flag allows (when it is FALSE) or forbids (when it is TRUE)
the stream buffer to resize dynamically the IO buffer.

\membersection{wxStreamBuffer::Flushable}

\func{void}{Flushable}{\param{bool}{ flushable}}

Toggles the flushable flag. If \it{flushable} is disabled, no datas are sent
to the parent stream.

\membersection{wxStreamBuffer::FlushBuffer}

\func{bool}{FlushBuffer}{\void}

Flushes the IO buffer.

\membersection{wxStreamBuffer::FillBuffer}

\func{bool}{FillBuffer}{\void}

Fill the IO buffer.

\membersection{wxStreamBuffer::GetDataLeft}

\func{size\_t}{GetDataLeft}{\void}

Returns the amount of available datas in the buffer.

% --------------
% Administration
% --------------
\membersection{wxStreamBuffer::Stream}

\func{wxStreamBase*}{Stream}{\void}

Returns the stream parent of the stream buffer.