Update docs to mention new filesystem handlers.

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

diff --git a/docs/latex/wx/fs.tex b/docs/latex/wx/fs.tex
index 5488d876f60ae3b6353c4b1159792b194d491e96..51822608148e65b258fa21b1924c47be87a789ce 100644 (file)
--- a/docs/latex/wx/fs.tex
+++ b/docs/latex/wx/fs.tex
@@ -1,37 +1,38 @@
-\section{File Systems}\label{fs}
+\section{wxFileSystem}\label{fs}

 
 The wxHTML library uses a {\bf virtual file systems} mechanism
 similar to the one used in Midnight Commander, Dos Navigator,
 
 The wxHTML library uses a {\bf virtual file systems} mechanism
 similar to the one used in Midnight Commander, Dos Navigator,

-FAR or almost any modern file manager. (Do you remember? You can
-press enter on ZIP file and its contents is displayed as if it
-were a local directory...)
+FAR or almost any modern file manager. It allows the user to access
+data stored in archives as if they were ordinary files. On-the-fly
+generated files that exist only in memory are also supported.

 
 \wxheading{Classes}
 
 
 \wxheading{Classes}
 

-Three classes are used in order to provide full VFS:
+Three classes are used in order to provide virtual file systems mechanism:

 
 \begin{itemize}\itemsep=0pt
 \item The \helpref{wxFSFile}{wxfsfile} class provides information
 
 \begin{itemize}\itemsep=0pt
 \item The \helpref{wxFSFile}{wxfsfile} class provides information

-on opened file (name, input stream, mime type and anchor).
+about opened file (name, input stream, mime type and anchor).

 \item The \helpref{wxFileSystem}{wxfilesystem} class is the interface.
 Its main methods are ChangePathTo() and OpenFile(). This class
 is most often used by the end user.
 \item The \helpref{wxFileSystemHandler}{wxfilesystemhandler} is the core
 \item The \helpref{wxFileSystem}{wxfilesystem} class is the interface.
 Its main methods are ChangePathTo() and OpenFile(). This class
 is most often used by the end user.
 \item The \helpref{wxFileSystemHandler}{wxfilesystemhandler} is the core

-if VFS mechanism. You can derive your own handler and pass it to
+of virtual file systems mechanism. You can derive your own handler and pass it to
+the VFS mechanism. You can derive your own handler and pass it to

 wxFileSystem's AddHandler() method. In the new handler you only need to
 wxFileSystem's AddHandler() method. In the new handler you only need to

-overwrite OpenFile() and CanOpen() methods.
+override the OpenFile() and CanOpen() methods.

 \end{itemize}
 
 \wxheading{Locations}
 
 \end{itemize}
 
 \wxheading{Locations}
 

-Locations (aka filenames aka addresses) are constructed from 4 parts:
+Locations (aka filenames aka addresses) are constructed from four parts:

 
 \begin{itemize}\itemsep=0pt
 \item {\bf protocol} - handler can recognize if it is able to open a
 file by checking its protocol. Examples are "http", "file" or "ftp".
 \item {\bf right location} - is the name of file within the protocol.
 
 \begin{itemize}\itemsep=0pt
 \item {\bf protocol} - handler can recognize if it is able to open a
 file by checking its protocol. Examples are "http", "file" or "ftp".
 \item {\bf right location} - is the name of file within the protocol.

-In "http://www.wxwindows.org/index.html" the right location is "//www.wxwindows.org/index.html".
-\item {\bf anchor} - anchor is optional and is usually not present.
+In "http://www.wxwidgets.org/index.html" the right location is "//www.wxwidgets.org/index.html".
+\item {\bf anchor} - an anchor is optional and is usually not present.

 In "index.htm\#chapter2" the anchor is "chapter2".
 \item {\bf left location} - this is usually an empty string. 
 It is used by 'local' protocols such as ZIP.
 In "index.htm\#chapter2" the anchor is "chapter2".
 \item {\bf left location} - this is usually an empty string. 
 It is used by 'local' protocols such as ZIP.


@@ -40,31 +41,55 @@ See Combined Protocols paragraph for details.
 
 \wxheading{Combined Protocols}
 
 
 \wxheading{Combined Protocols}
 

-Left location pretends protocol in URL string. 
-It's not used by global protocols like HTTP but it's used
-by local ones - for example you can see this address:
+The left location precedes the protocol in the URL string. 
+It is not used by global protocols like HTTP but it becomes handy when nesting
+protocols - for example you may want to access files in a ZIP archive:

 
 file:archives/cpp\_doc.zip\#zip:reference/fopen.htm\#syntax
 
 
 file:archives/cpp\_doc.zip\#zip:reference/fopen.htm\#syntax
 

-In this example, protocol is "zip", left location is
-"reference/fopen.htm", anchor is "syntax" and right location
-is "file:archives/cpp_doc.zip". It is used by zip handler
-to determine in what file this particular zip VFS is stored.
+In this example, the protocol is "zip", right location is
+"reference/fopen.htm", anchor is "syntax" and left location
+is "file:archives/cpp\_doc.zip". 

 
 

-In fact there are two protocols used in this example: zip and file.
-You can construct even more complicated addresses like this one:
+There are {\bf two} protocols used in this example: "zip" and "file".

 
 

-http://www.archives.org/myarchive.zip\#zip:local/docs/cpp/stdio.zip\#zip:index.htm
+\wxheading{File Systems Included in wxHTML}

 
 

-In this example you access zip VFS stdio.zip stored in another zip (myarchive.zip)
-which is at WWW.
+The following virtual file system handlers are part of wxWidgets so far:

 
 

-\wxheading{File Systems Included in wxHTML}
+\begin{twocollist}
+\twocolitem{{\bf wxArchiveFSHandler}}{A handler for archives such as zip
+and tar. Include file is <wx/fs\_arc.h>. URLs examples:
+"archive.zip\#zip:filename", "archive.tar.gz\#gzip:\#tar:filename".}
+\twocolitem{{\bf wxFilterFSHandler}}{A handler for compression schemes such
+as gzip. Header is <wx/fs\_filter.h>. URLs are in the form, e.g.:
+"document.ps.gz\#gzip:".}
+\twocolitem{{\bf wxInternetFSHandler}}{A handler for accessing documents
+via HTTP or FTP protocols. Include file is <wx/fs\_inet.h>.}
+\twocolitem{{\bf wxMemoryFSHandler}}{This handler allows you to access 
+data stored in memory (such as bitmaps) as if they were regular files.
+See \helpref{wxMemoryFSHandler documentation}{wxmemoryfshandler} for details.
+Include file is <wx/fs\_mem.h>. URL is prefixed with memory:, e.g. 
+"memory:myfile.htm"}
+\end{twocollist}
+
+In addition, wxFileSystem itself can access local files.
+
+
+\wxheading{Initializing file system handlers}
+
+Use \helpref{wxFileSystem::AddHandler}{wxfilesystemaddhandler} to initialize
+a handler, for example:
+
+\begin{verbatim}
+#include <wx/fs_mem.h>
+
+...

 
 

-\begin{enumerate}\itemsep=0pt
-\item Local files
-\item HTTP protocol
-\item FTP protocol
-\item .ZIP archives
-\end{enumerate}
+bool MyApp::OnInit()
+{
+    wxFileSystem::AddHandler(new wxMemoryFSHandler);
+...
+}
+\end{verbatim}