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support for huge files (patch 1002226)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29355 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2004-09-25 22:44:19 +00:00
parent 395480fb22
commit 6294ac2e91
9 changed files with 500 additions and 350 deletions
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18
docs/latex/wx/file.tex
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@@ -19,6 +19,10 @@ its destructor making it unnecessary to worry about forgetting to do it.
wxFile is a wrapper around {\tt file descriptor.} - see also
\helpref{wxFFile}{wxffile} for a wrapper around {\tt FILE} structure.
{\tt wxFileOffset} is used by the wxFile functions which require offsets as
parameter or return them. If the platform supports it, wxFileOffset if a typedef
for a native 64 bit integer, else a 32 bit integer is used for wxFileOffset.
\wxheading{Derived from}
None.
@@ -70,7 +74,7 @@ Will fail if the file already exists, else create and open it atomically. Usefu
\end{twocollist}
Other constants defined elsewhere but used by wxFile functions are wxInvalidOffset which represents an
invalid value of type {\it off\_t} and is returned by functions returning {\it off\_t} on error and the seek
invalid value of type {\it wxFileOffset} and is returned by functions returning {\it wxFileOffset} on error and the seek
mode constants used with \helpref{Seek()}{wxfileseek}:
\twocolwidtha{7cm}
@@ -204,7 +208,7 @@ Returns true if the file has been opened.
\membersection{wxFile::Length}\label{wxfilelength}
\constfunc{off\_t}{Length}{\void}
\constfunc{wxFileOffset}{Length}{\void}
Returns the length of the file.
@@ -222,7 +226,7 @@ Opens the file, returning true if successful.
\membersection{wxFile::Read}\label{wxfileread}
\func{off\_t}{Read}{\param{void*}{ buffer}, \param{off\_t}{ count}}
\func{size\_t}{Read}{\param{void*}{ buffer}, \param{size\_t}{ count}}
Reads the specified number of bytes into a buffer, returning the actual number read.
@@ -238,7 +242,7 @@ The number of bytes read, or the symbol {\bf wxInvalidOffset} (-1) if there was
\membersection{wxFile::Seek}\label{wxfileseek}
\func{off\_t}{Seek}{\param{off\_t }{ofs}, \param{wxSeekMode }{mode = wxFromStart}}
\func{wxFileOffset}{Seek}{\param{wxFileOffset }{ofs}, \param{wxSeekMode }{mode = wxFromStart}}
Seeks to the specified position.
@@ -254,7 +258,7 @@ The actual offset position achieved, or wxInvalidOffset on failure.
\membersection{wxFile::SeekEnd}\label{wxfileseekend}
\func{off\_t}{SeekEnd}{\param{off\_t }{ofs = 0}}
\func{wxFileOffset}{SeekEnd}{\param{wxFileOffset }{ofs = 0}}
Moves the file pointer to the specified number of bytes before the end of the file.
@@ -268,14 +272,14 @@ The actual offset position achieved, or wxInvalidOffset on failure.
\membersection{wxFile::Tell}\label{wxfiletell}
\constfunc{off\_t}{Tell}{\void}
\constfunc{wxFileOffset}{Tell}{\void}
Returns the current position or wxInvalidOffset if file is not opened or if another
error occurred.
\membersection{wxFile::Write}\label{wxfilewrite}
\func{size\_t}{Write}{\param{const void*}{ buffer}, \param{off\_t}{ count}}
\func{size\_t}{Write}{\param{const void*}{ buffer}, \param{wxFileOffset}{ count}}
Writes the specified number of bytes from a buffer.