Documented wxFFile and wxFFileStream and Co.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4871 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/file.tex

@@ -148,7 +148,12 @@ Returns the file descriptor associated with the file.
 
 \constfunc{bool}{Eof}{\void}
 
-Returns TRUE if the end of the file has been reached.
+Returns TRUE if the end of the file has been reached (the last byte has been read).
+
+Note that the behaviour of the file pointer based class
+\helpref{wxFFile}{wxffile} is different as \helpref{wxFFile::Eof}{wxffileeof}
+will return TRUE here only if an attempt has been made to read
+{\it past} the last byte of the file.
 
 \membersection{wxFile::Exists}\label{wxfileexists}
 
@@ -208,7 +213,7 @@ 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{wxFile::SeekMode }{mode = wxFile::FromStart}}
+\func{off\_t}{Seek}{\param{off\_t }{ofs}, \param{wxSeekMode }{mode = wxFromStart}}
 
 Seeks to the specified position.
 
@@ -216,7 +221,7 @@ Seeks to the specified position.
 
 \docparam{ofs}{Offset to seek to.}
 
-\docparam{mode}{One of {\bf wxFile::FromStart}, {\bf wxFile::FromEnd}, {\bf wxFile::FromCurrent}.}
+\docparam{mode}{One of {\bf wxFromStart}, {\bf wxFromEnd}, {\bf wxFromCurrent}.}
 
 \wxheading{Return value}
 
@@ -265,3 +270,197 @@ TRUE if the operation was successful.
 
 Writes the contents of the string to the file, returns TRUE on success.
 
+\section{\class{wxFFile}}\label{wxffile}
+
+A wxFFile performs raw file I/O. This is a very small class designed to
+minimize the overhead of using it - in fact, there is hardly any overhead at
+all, but using it brings you automatic error checking and hides differences
+between platforms and compilers.
+
+\wxheading{Derived from}
+
+None.
+
+\wxheading{Include files}
+
+<wx/ffile.h>
+
+\twocolwidtha{7cm}
+\begin{twocollist}\itemsep=0pt%
+\twocolitem{{\bf wxFromStart}}{Count offset from the start of the file}
+\twocolitem{{\bf wxFromCurrent}}{Count offset from the current position of the file pointer}
+\twocolitem{{\bf wxFromEnd}}{Count offset from the end of the file (backwards)}
+\end{twocollist}
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxFFile::wxFFile}\label{wxffileconstr}
+
+\func{}{wxFFile}{\void}
+
+Default constructor.
+
+\func{}{wxFFile}{\param{const char*}{ filename}, \param{const char*}{ mode = "r"}}
+
+Opens a file with the given mode. As there is no way to return whether the
+operation was successful or not from the constructor you should test the
+return value of \helpref{IsOpened}{wxffileisopened} to check that it didn't
+fail.
+
+\func{}{wxFFile}{\param{FILE*}{ fp}}
+
+Opens a file with the given file pointer, which has already been opened.
+
+\wxheading{Parameters}
+
+\docparam{filename}{The filename.}
+
+\docparam{mode}{The mode in which to open the file using standard C strings.}
+
+\docparam{fp}{An existing file descriptor, such as stderr.}
+
+\membersection{wxFFile::\destruct{wxFFile}}
+
+\func{}{\destruct{wxFFile}}{\void}
+
+Destructor will close the file.
+
+NB: it is not virtual so you should {\it not} derive from wxFFile!
+
+\membersection{wxFFile::Attach}\label{wxffileattach}
+
+\func{void}{Attach}{\param{FILE*}{ fp}}
+
+Attaches an existing file pointer to the wxFFile object.
+
+The descriptor should be already opened and it will be closed by wxFFile
+object.
+
+\membersection{wxFFile::Close}\label{wxffileclose}
+
+\func{bool}{Close}{\void}
+
+Closes the file and returns TRUE on success.
+
+\membersection{wxFFile::Detach}\label{wxffiledetach}
+
+\func{void}{Detach}{\void}
+
+Get back a file pointer from wxFFile object - the caller is responsible for closing the file if this
+descriptor is opened. \helpref{IsOpened()}{wxffileisopened} will return FALSE after call to Detach().
+
+\membersection{wxFFile::fp}\label{wxffilefp}
+
+\constfunc{FILE *}{fp}{\void}
+
+Returns the file pointer associated with the file.
+
+\membersection{wxFFile::Eof}\label{wxffileeof}
+
+\constfunc{bool}{Eof}{\void}
+
+Returns TRUE if the an attempt has been made to read {\it past}
+the end of the file. 
+
+Note that the behaviour of the file descriptor based class
+\helpref{wxFile}{wxfile} is different as \helpref{wxFile::Eof}{wxfileeof}
+will return TRUE here as soon as the last byte of the file has been
+read.
+
+\membersection{wxFFile::Flush}\label{wxffileflush}
+
+\func{bool}{Flush}{\void}
+
+Flushes the file and returns TRUE on success.
+
+\membersection{wxFFile::IsOpened}\label{wxffileisopened}
+
+\constfunc{bool}{IsOpened}{\void}
+
+Returns TRUE if the file has been opened.
+
+\membersection{wxFFile::Length}\label{wxffilelength}
+
+\constfunc{size\_t}{Length}{\void}
+
+Returns the length of the file.
+
+\membersection{wxFFile::Open}\label{wxffileopen}
+
+\func{bool}{Open}{\param{const char*}{ filename}, \param{const char*}{ mode = "r"}}
+
+Opens the file, returning TRUE if successful.
+
+\wxheading{Parameters}
+
+\docparam{filename}{The filename.}
+
+\docparam{mode}{The mode in which to open the file.}
+
+\membersection{wxFFile::Read}\label{wxffileread}
+
+\func{size\_t}{Read}{\param{void*}{ buffer}, \param{off\_t}{ count}}
+
+Reads the specified number of bytes into a buffer, returning the actual number read.
+
+\wxheading{Parameters}
+
+\docparam{buffer}{A buffer to receive the data.}
+
+\docparam{count}{The number of bytes to read.}
+
+\wxheading{Return value}
+
+The number of bytes read.
+
+\membersection{wxFFile::Seek}\label{wxffileseek}
+
+\func{bool}{Seek}{\param{long }{ofs}, \param{wxSeekMode }{mode = wxFromStart}}
+
+Seeks to the specified position and returs TRUE on success.
+
+\wxheading{Parameters}
+
+\docparam{ofs}{Offset to seek to.}
+
+\docparam{mode}{One of {\bf wxFromStart}, {\bf wxFromEnd}, {\bf wxFromCurrent}.}
+
+\membersection{wxFFile::SeekEnd}\label{wxffileseekend}
+
+\func{bool}{SeekEnd}{\param{long }{ofs = 0}}
+
+Moves the file pointer to the specified number of bytes before the end of the file
+and returns TRUE on success.
+
+\wxheading{Parameters}
+
+\docparam{ofs}{Number of bytes before the end of the file.}
+
+\membersection{wxFFile::Tell}\label{wxffiletell}
+
+\constfunc{size\_t}{Tell}{\void}
+
+Returns the current position.
+
+\membersection{wxFFile::Write}\label{wxffilewrite}
+
+\func{size_t}{Write}{\param{const void*}{ buffer}, \param{size\_t}{ count}}
+
+Writes the specified number of bytes from a buffer.
+
+\wxheading{Parameters}
+
+\docparam{buffer}{A buffer containing the data.}
+
+\docparam{count}{The number of bytes to write.}
+
+\wxheading{Return value}
+
+Number of bytes written.
+
+\membersection{wxFFile::Write}\label{wxffilewrites}
+
+\func{bool}{Write}{\param{const wxString\& }{s}}
+
+Writes the contents of the string to the file, returns TRUE on success.
+