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.
\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}
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxFile::wxFile}\label{wxfileconstr}
+
+\membersection{wxFile::wxFile}\label{wxfilector}
\func{}{wxFile}{\void}
\docparam{fd}{An existing file descriptor (see \helpref{Attach()}{wxfileattach} for the list of predefined descriptors)}
-\membersection{wxFile::\destruct{wxFile}}
+
+\membersection{wxFile::\destruct{wxFile}}\label{wxfiledtor}
\func{}{\destruct{wxFile}}{\void}
{\bf NB:} it is not virtual so you should not use wxFile polymorphically.
+
\membersection{wxFile::Access}\label{wxfileaccess}
\func{static bool}{Access}{\param{const char *}{ name}, \param{OpenMode}{ mode}}
This function verifies if we may access the given file in specified mode. Only
values of wxFile::read or wxFile::write really make sense here.
+
\membersection{wxFile::Attach}\label{wxfileattach}
\func{void}{Attach}{\param{int}{ fd}}
The descriptor should be already opened and it will be closed by wxFile
object.
+
\membersection{wxFile::Close}\label{wxfileclose}
\func{void}{Close}{\void}
Closes the file.
+
\membersection{wxFile::Create}\label{wxfilecreate}
\func{bool}{Create}{\param{const char*}{ filename}, \param{bool}{ overwrite = false}, \param{int }{access = wxS\_DEFAULT}}
Creates a file for writing. If the file already exists, setting {\bf overwrite} to true
will ensure it is overwritten.
+
\membersection{wxFile::Detach}\label{wxfiledetach}
\func{void}{Detach}{\void}
Get back a file descriptor from wxFile object - the caller is responsible for closing the file if this
descriptor is opened. \helpref{IsOpened()}{wxfileisopened} will return false after call to Detach().
+
\membersection{wxFile::fd}\label{wxfilefd}
\constfunc{int}{fd}{\void}
Returns the file descriptor associated with the file.
+
\membersection{wxFile::Eof}\label{wxfileeof}
\constfunc{bool}{Eof}{\void}
\helpref{Read}{wxfileread} repeatedly and tests its return condition instead
of using Eof() as this will not work for special files under Unix.
+
\membersection{wxFile::Exists}\label{wxfileexists}
\func{static bool}{Exists}{\param{const char*}{ filename}}
Returns true if the given name specifies an existing regular file (not a
directory or a link)
+
\membersection{wxFile::Flush}\label{wxfileflush}
\func{bool}{Flush}{\void}
due to a missing fsync function, which reduces the usefulness of this function
(it can still be called but it will do nothing on unsupported compilers).
+
+\membersection{wxFile::GetKind}\label{wxfilegetfilekind}
+
+\constfunc{wxFileKind}{GetKind}{\void}
+
+Returns the type of the file. Possible return values are:
+
+\begin{verbatim}
+enum wxFileKind
+{
+ wxFILE_KIND_UNKNOWN,
+ wxFILE_KIND_DISK, // a file supporting seeking to arbitrary offsets
+ wxFILE_KIND_TERMINAL, // a tty
+ wxFILE_KIND_PIPE // a pipe
+};
+
+\end{verbatim}
+
+
\membersection{wxFile::IsOpened}\label{wxfileisopened}
\constfunc{bool}{IsOpened}{\void}
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.
+
\membersection{wxFile::Open}\label{wxfileopen}
\func{bool}{Open}{\param{const char*}{ filename}, \param{wxFile::OpenMode}{ mode = wxFile::read}}
\docparam{mode}{The mode in which to open the file. May be one of {\bf wxFile::read}, {\bf wxFile::write} and {\bf wxFile::read\_write}.}
+
\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.
The number of bytes read, or the symbol {\bf wxInvalidOffset} (-1) if there was an error.
+
\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.
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.
+Moves the file pointer to the specified number of bytes relative to the end of
+the file. For example, \texttt{SeekEnd($-5$)} would position the pointer $5$
+bytes before the end.
\wxheading{Parameters}
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{size\_t}{ count}}
Writes the specified number of bytes from a buffer.
the number of bytes actually written
+
\membersection{wxFile::Write}\label{wxfilewrites}
\func{bool}{Write}{\param{const wxString\& }{s}, \param{wxMBConv\&}{ conv = wxConvUTF8}}
Writes the contents of the string to the file, returns true on success.
-The second argument is only meaningful in Unicode build of wxWindows when
+The second argument is only meaningful in Unicode build of wxWidgets when
{\it conv} is used to convert {\it s} to multibyte representation.
+Note that this method only works with {\tt NUL}-terminated strings, if you want
+to write data with embedded {\tt NUL}s to the file you should use the other
+\helpref{Write() overload}{wxfilewrite}.
+
projects / wxWidgets.git / blobdiff