escape more underscores (we need a pre-commit check for those...)

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

diff --git a/docs/latex/wx/fs.tex b/docs/latex/wx/fs.tex
index a183aa63a4d25a219a5415c9c62a16e8fe5226a9..c8f80148b8402532cdde4f6510a66e800c9fcf33 100644 (file)
--- a/docs/latex/wx/fs.tex
+++ b/docs/latex/wx/fs.tex
@@ -1,75 +1,91 @@
-\section{File Systems}\label{fs}
+\section{wxFileSystem}\label{fs}

 
 

-The wxHTML library uses {\bf virtual file systems} mechanism
-similar to the one used in Midnight Commander or Dos Navigator or
-FAR or almost any modern file manager. (Do you remember? You can
-press enter on ZIP file and it's content is displayed like it's
-a directory...)
+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. 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}
-\item \helpref{wxFSFile}{wxfsfile} class provides information
-on opened file (name, input stream, mime type and anchor).
-
-\item \helpref{wxFileSystem}{wxfilesystem} class is interface.
-It's main methods are ChangePathTo() and OpenFile(). This class
+\begin{itemize}\itemsep=0pt
+\item The \helpref{wxFSFile}{wxfsfile} class provides information
+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.
 is most often used by the end user.

-
-\item \helpref{wxFileSystemHandler}{wxfilesystemhandler} is the core
-if VFS mechanism. You can derive your own handler and pass it to
+\item The \helpref{wxFileSystemHandler}{wxfilesystemhandler} is the core
+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:
-
-\begin{itemize}
-\item {\bf protocol} - handler can regonize if it is able to open some
-file by checking it's protocol. Examples are "http", "file" or "ftp"
+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.
 \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 "index.htm\#chapter2" the anchor is "chapter2"
-
-\item {\bf left location} - this is usually empty string. 
+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.
 See Combined Protocols paragraph for details.
 \end{itemize}
 
 \wxheading{Combined Protocols}
 
 It is used by 'local' protocols such as ZIP.
 See Combined Protocols paragraph for details.
 \end{itemize}
 
 \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. Enjoy it :-)
+The following virtual file system handlers are part of wxWidgets so far:

 
 

-\wxheading{File Systems Included in wxHTML}
+\begin{twocollist}
+\twocolitem{{\bf wxInternetFSHandler}}{A handler for accessing documents
+via HTTP or FTP protocols. Include file is <wx/fs\_inet.h>.}
+\twocolitem{{\bf wxZipFSHandler}}{A handler for ZIP archives. 
+Include file is <wx/fs\_zip.h>. URL is in form "archive.zip\#zip:filename".}
+\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}
-\item Local files
-\item HTTP protocol
-\item FTP protocol
-\item .ZIP archives
-\end{enumerate}
+bool MyApp::OnInit()
+{
+    wxFileSystem::AddHandler(new wxMemoryFSHandler);
+...
+}
+\end{verbatim}