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[wxWidgets.git] / docs / latex / wx / filesys.tex

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\section{\class{wxFileSystem}}\label{wxfilesystem}

This class provides an interface for opening files on different
file systems. It can handle absolute and/or local filenames.
It uses a system of \helpref{handlers}{wxfilesystemhandler} to
provide access to user-defined virtual file systems.

\wxheading{Derived from}

\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/filesys.h>

\wxheading{See Also}

\helpref{wxFileSystemHandler}{wxfilesystemhandler}, 
\helpref{wxFSFile}{wxfsfile}, 
\helpref{Overview}{fs}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxFileSystem::wxFileSystem}\label{wxfilesystemwxfilesystem}

\func{}{wxFileSystem}{\void}

Constructor. 

\membersection{wxFileSystem::AddHandler}\label{wxfilesystemaddhandler}

\func{static void}{AddHandler}{\param{wxFileSystemHandler }{*handler}}

This static function adds new handler into the list of handlers.
The \helpref{handlers}{wxfilesystemhandler} provide access to virtual FS.

\wxheading{Note}

You can call:

\begin{verbatim}
wxFileSystem::AddHandler(new My_FS_Handler);
\end{verbatim}

This is because (a) AddHandler is a static method, and (b) the handlers
are deleted in wxFileSystem's destructor so that you don't have to
care about it.

\membersection{wxFileSystem::ChangePathTo}\label{wxfilesystemchangepathto}

\func{void}{ChangePathTo}{\param{const wxString\& }{location}, \param{bool }{is\_dir = false}}

Sets the current location. {\it location} parameter passed to 
\helpref{OpenFile}{wxfilesystemopenfile} is relative to this path.

{\bf Caution! } Unless {\it is\_dir} is true the {\it location} parameter
is not the directory name but the name of the file in this directory. All these
commands change the path to "dir/subdir/":

\begin{verbatim}
  ChangePathTo("dir/subdir/xh.htm");
  ChangePathTo("dir/subdir", true);
  ChangePathTo("dir/subdir/", true);
\end{verbatim}

\wxheading{Parameters}

\docparam{location}{the new location. Its meaning depends on the value of {\it is\_dir}}

\docparam{is\_dir}{if true {\it location} is new directory. If false (default) 
{\it location} is {\bf file in} the new directory.}

\wxheading{Example}

\begin{verbatim}
  f = fs -> OpenFile("hello.htm"); // opens file 'hello.htm'
  fs -> ChangePathTo("subdir/folder", true);
  f = fs -> OpenFile("hello.htm"); // opens file 'subdir/folder/hello.htm' !!
\end{verbatim}

\membersection{wxFileSystem::GetPath}\label{wxfilesystemgetpath}

\func{wxString}{GetPath}{\void}

Returns actual path (set by \helpref{ChangePathTo}{wxfilesystemchangepathto}).

\membersection{wxFileSystem::FileNameToURL}\label{wxfilesystemfilenametourl}

\func{static wxString}{FileNameToURL}{\param{wxFileName }{filename}}

Converts filename into URL.

\wxheading{See also}

\helpref{wxFileSystem::URLToFileName}{wxfilesystemurltofilename},
\helpref{wxFileName}{wxfilename}

\membersection{wxFileSystem::FindFirst}\label{wxfilesystemfindfirst}

\func{wxString}{FindFirst}{\param{const wxString\& }{wildcard}, \param{int }{flags = 0}}

Works like \helpref{wxFindFirstFile}{wxfindfirstfile}. Returns name of the first
filename (within filesystem's current path) that matches {\it wildcard}. {\it flags} may be one of
wxFILE (only files), wxDIR (only directories) or 0 (both).

\membersection{wxFileSystem::FindNext}\label{wxfilesystemfindnext}

\func{wxString}{FindNext}{\void}

Returns the next filename that matches parameters passed to \helpref{FindFirst}{wxfilesystemfindfirst}.

\membersection{wxFileSystem::OpenFile}\label{wxfilesystemopenfile}

\func{wxFSFile*}{OpenFile}{\param{const wxString\& }{location}}

Opens the file and returns a pointer to a \helpref{wxFSFile}{wxfsfile} object
or NULL if failed. It first tries to open the file in relative scope
(based on value passed to ChangePathTo() method) and then as an
absolute path.  Note that the user is responsible for deleting the returned
wxFSFile.  

\membersection{wxFileSystem::URLToFileName}\label{wxfilesystemurltofilename}

\func{static wxFileName}{URLToFileName}{\param{const wxString\& }{url}}

Converts URL into a well-formed filename. The URL must use the {\tt file} 
protocol.

\wxheading{See also}

\helpref{wxFileSystem::FileNameToURL}{wxfilesystemfilenametourl}, 
\helpref{wxFileName}{wxfilename}