8795498cd9
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32309 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
131 lines
4.0 KiB
TeX
131 lines
4.0 KiB
TeX
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Name: membuf.tex
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%% Purpose: wxMemoryBuffer class documentation
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%% Author: Roger Gammans
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%% Modified by:
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%% Created: 08.06.2004
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%% RCS-ID: $Id$
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%% Copyright: (c) Roger Gammans
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%% License: wxWindows license
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\section{\class{wxMemoryBuffer}}\label{wxmemorybuffer}
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A {\bf wxMemoryBuffer} is a useful data structure for storing arbitrary sized blocks
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of memory. wxMemoryBuffer guarantees deletion of the memory block when the object
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is destroyed.
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\wxheading{Derived from}
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None
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\wxheading{Include files}
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<wx/buffer.h>
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxMemoryBuffer::wxMemoryBuffer}\label{wxmemorybufferctor}
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\func{}{wxMemoryBuffer}{\param{const wxMemoryBuffer\&}{ src}}
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Copy constructor, refcounting is used for performance , but wxMemoryBuffer
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is not a copy-on-write structure so changes made to one buffer effect
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all copies made from it.
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\func{}{wxMemoryBuffer}{\param{size\_t}{ size}}
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Create a new buffer.
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\docparam{size}{size of new buffer.}
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\membersection{wxMemoryBuffer::GetData}\label{wxmemorybuffergetdata}
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\func{void* }{GetData}{\void}
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Return a pointer to the data in the buffer.
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\membersection{wxMemoryBuffer::GetBufSize}\label{wxmemorybuffergetbufsize}
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\func{size\_t}{GetBufSize}{\void}
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Returns the size of the buffer.
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\membersection{wxMemoryBuffer::GetDataLen}\label{wxmemorybuffergetdatalen}
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\func{size\_t}{GetDataLen}{\void}
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Returns the length of the valid data in the buffer.
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\membersection{wxMemoryBuffer::SetBufSize}\label{wxmemorybuffersetbufsize}
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\func{void}{SetBufSize}{\param{size\_t}{ size}}
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Ensures the buffer has at least {\it size} bytes available.
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\membersection{wxMemoryBuffer::SetDataLen}\label{wxmemorybuffersetdatalen}
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\func{void}{SetDataLen}{\param{size\_t}{ size}}
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Sets the length of the data stored in the buffer. Mainly useful for truncating existing data.
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\docparam{size}{New length of the valid data in the buffer. This is
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distinct from the allocated size}
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\membersection{wxMemoryBuffer::GetWriteBuf}\label{wxmemorybuffergetwritebuf}
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\func{void *}{GetWriteBuf}{\param{size\_t}{ sizeNeeded}}
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Ensure the buffer is big enough and return a pointer to the
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buffer which can be used to directly write into the buffer
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up to {\it sizeNeeded} bytes.
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\membersection{wxMemoryBuffer::UngetWriteBuf}\label{wxmemorybufferungetwritebuf}
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\func{void}{UngetWriteBuf}{\param{size\_t}{ sizeUsed}}
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Update the buffer after completing a direct write, which
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you must have used GetWriteBuf() to initialise.
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\docparam{sizeUsed}{The amount of data written in to buffer
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by the direct write}
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\membersection{wxMemoryBuffer::GetAppendBuf}\label{wxmemorybuffergetappendbuf}
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\func{void *}{GetAppendBuf}{\param{size\_t}{ sizeNeeded}}
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Ensure that the buffer is big enough and return a pointer to the start
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of the empty space in the buffer. This pointer can be used to directly
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write data into the buffer, this new data will be appended to
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the existing data.
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\docparam{sizeNeeded}{Amount of extra space required in the buffer for
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the append operation}
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\membersection{wxMemoryBuffer::UngetAppendBuf}\label{wxmemorybufferungetappendbuf}
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\func{void}{UngetAppendBuf}{\param{size\_t}{ sizeUsed}}
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Update the length after completing a direct append, which
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you must have used GetAppendBuf() to initialise.
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\docparam{sizeUsed}{This is the amount of new data that has been
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appended.}
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\membersection{wxMemoryBuffer::AppendByte}\label{wxmemorybufferappendbyte}
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\func{void}{AppendByte}{\param{char}{ data}}
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Append a single byte to the buffer.
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\docparam{data}{New byte to append to the buffer.}
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\membersection{wxMemoryBuffer::AppendData}\label{wxmemorybufferappenddata}
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\func{void}{AppendData}{\param{void*}{ data}, \param{size\_t}{ len}}
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Single call to append a data block to the buffer.
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\docparam{data}{Pointer to block to append to the buffer.}
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\docparam{len}{Length of data to append.}
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