added support for reading alpha channel

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

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Name:        ftp.tex
%% Purpose:     wxFTP documentation
%% Author:      Guilhem Lavaux, Vadim Zeitlin
%% Modified by:
%% Created:     ~1997
%% RCS-ID:      $Id$
%% Copyright:   (c) wxWindows team
%% License:     wxWindows license
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{\class{wxFTP}}\label{wxftp}

wxFTP can be used to establish a connection to an FTP server and perform all the
usual operations. Please consult the RFC 959 for more details about the FTP
protocol.

To use a commands which doesn't involve file transfer (i.e. directory oriented
commands) you just need to call a corresponding member function or use the
generic \helpref{SendCommand}{wxftpsendcommand} method. However to actually
transfer files you just get or give a stream to or from this class and the
actual data are read or written using the usual stream methods.

Example of using wxFTP for file downloading:

\begin{verbatim}
    wxFTP ftp;

    // if you don't use these lines anonymous login will be used
    ftp.SetUser("user");
    ftp.SetPassword("password");

    if ( !ftp.Connect("ftp.wxwindows.org") )
    {
        wxLogError("Couldn't connect");
        return;
    }

    ftp.ChDir("/pub");
    wxInputStream *in = ftp.GetInputStream("wxWindows-4.2.0.tar.gz");
    if ( !in )
    {
        wxLogError("Coudln't get file");
    }
    else
    {
        size_t size = in->StreamSize();
        char *data = new char[size];
        if ( !in->Read(data, size) )
        {
            wxLogError("Read error");
        }
        else
        {
            // file data is in the buffer
            ...
        }

        delete [] data;
        delete in;
    }
\end{verbatim}

To upload a file you would do (assuming the connection to the server was opened
successfully):

\begin{verbatim}
        wxOutputStream *out = ftp.GetOutputStream("filename");
        if ( out )
        {
            out->Write(...); // your data
            delete out;
        }
\end{verbatim}

\wxheading{Constants}

wxFTP defines constants corresponding to the two supported transfer modes:

\begin{verbatim}
enum TransferMode
{
    ASCII,
    BINARY
};
\end{verbatim}

\wxheading{Derived from}

\helpref{wxProtocol}{wxprotocol}

\wxheading{Include files}

<wx/protocol/ftp.h>

\wxheading{See also}

\helpref{wxSocketBase}{wxsocketbase}

% ----------------------------------------------------------------------------
% Members
% ----------------------------------------------------------------------------

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

\membersection{wxFTP::wxFTP}

\func{}{wxFTP}{\void}

Default constructor.

\membersection{wxFTP::\destruct{wxFTP}}

\func{}{\destruct{wxFTP}}{\void}

Destructor will close the connection if connected.

\membersection{wxFTP::Abort}\label{wxftpabort}

\func{bool}{Abort}{\void}

Aborts the download currently in process, returns {\tt true} if ok, {\tt false} 
if an error occured.

\membersection{wxFTP::CheckCommand}

\func{bool}{CheckCommand}{\param{const wxString\&}{ command}, \param{char }{ret}}

Send the specified {\it command} to the FTP server. {\it ret} specifies
the expected result.

\wxheading{Return value}

true if the command has been sent successfully, else false.

\membersection{wxFTP::SendCommand}\label{wxftpsendcommand}

\func{char}{SendCommand}{\param{const wxString\&}{ command}}

Send the specified {\it command} to the FTP server and return the first
character of the return code.

\membersection{wxFTP::GetLastResult}

\func{const wxString\&}{GetLastResult}{\void}

Returns the last command result, i.e. the full server reply for the last
command.

% ----------------------------------------------------------------------------

\membersection{wxFTP::ChDir}

\func{bool}{ChDir}{\param{const wxString\&}{ dir}}

Change the current FTP working directory.
Returns true if successful.

\membersection{wxFTP::MkDir}

\func{bool}{MkDir}{\param{const wxString\&}{ dir}}

Create the specified directory in the current FTP working directory.
Returns true if successful.

\membersection{wxFTP::RmDir}

\func{bool}{RmDir}{\param{const wxString\&}{ dir}}

Remove the specified directory from the current FTP working directory.
Returns true if successful.

\membersection{wxFTP::Pwd}

\func{wxString}{Pwd}{\void}

Returns the current FTP working directory.

% ----------------------------------------------------------------------------

\membersection{wxFTP::Rename}

\func{bool}{Rename}{\param{const wxString\&}{ src}, \param{const wxString\&}{ dst}}

Rename the specified {\it src} element to {\it dst}. Returns true if successful.

% ----------------------------------------------------------------------------

\membersection{wxFTP::RmFile}

\func{bool}{RmFile}{\param{const wxString\&}{ path}}

Delete the file specified by {\it path}. Returns true if successful.

% ----------------------------------------------------------------------------

\membersection{wxFTP::SetAscii}

\func{bool}{SetAscii}{\void}

Sets the transfer mode to ASCII. It will be used for the next transfer.

\membersection{wxFTP::SetBinary}

\func{bool}{SetBinary}{\void}

Sets the transfer mode to binary (IMAGE). It will be used for the next transfer.

\membersection{wxFTP::SetTransferMode}

\func{bool}{SetTransferMode}{\param{TransferMode }{mode}}

Sets the transfer mode to the specified one. It will be used for the next
transfer.

If this function is never called, binary transfer mode is used by default.

% ----------------------------------------------------------------------------

\membersection{wxFTP::SetUser}

\func{void}{SetUser}{\param{const wxString\&}{ user}}

Sets the user name to be sent to the FTP server to be allowed to log in.

\wxheading{Default value}

The default value of the user name is "anonymous".

\wxheading{Remark}

This parameter can be included in a URL if you want to use the URL manager.
For example, you can use: "ftp://a\_user:a\_password@a.host:service/a\_directory/a\_file"
to specify a user and a password.

\membersection{wxFTP::SetPassword}

\func{void}{SetPassword}{\param{const wxString\&}{ passwd}}

Sets the password to be sent to the FTP server to be allowed to log in.

\wxheading{Default value}

The default value of the user name is your email address. For example, it could
be "username@userhost.domain". This password is built by getting the current
user name and the host name of the local machine from the system.

\wxheading{Remark}

This parameter can be included in a URL if you want to use the URL manager.
For example, you can use: "ftp://a\_user:a\_password@a.host:service/a\_directory/a\_file"
to specify a user and a password.

% ----------------------------------------------------------------------------

\membersection{wxFTP::FileExists}\label{wxftpfileexists}

\func{bool}{FileExists}{\param{const wxString\&}{ filename}}

Returns {\tt true} if the given remote file exists, {\tt false} otherwise.

\membersection{wxFTP::GetFileSize}\label{wxftpgetfilesize}

\func{int}{GetFileSize}{\param{const wxString\&}{ filename}}

Returns the file size in bytes or $-1$ if the file doesn't exist or the size
couldn't be determined. Notice that this size can be approximative size only
and shouldn't be used for allocating the buffer in which the remote file is
copied, for example.

\membersection{wxFTP::GetDirList}\label{wxftpgetdirlist}

\func{bool}{GetDirList}{\param{wxArrayString\& }{files}, \param{const wxString\&}{ wildcard = ""}}

The GetList function is quite low-level. It returns the list of the files in
the current directory. The list can be filtered using the {\it wildcard} string.
If {\it wildcard} is empty (default), it will return all files in directory.

The form of the list can change from one peer system to another. For example,
for a UNIX peer system, it will look like this:

\begin{verbatim}
-r--r--r--   1 guilhem  lavaux      12738 Jan 16 20:17 cmndata.cpp
-r--r--r--   1 guilhem  lavaux      10866 Jan 24 16:41 config.cpp
-rw-rw-rw-   1 guilhem  lavaux      29967 Dec 21 19:17 cwlex_yy.c
-rw-rw-rw-   1 guilhem  lavaux      14342 Jan 22 19:51 cwy_tab.c
-r--r--r--   1 guilhem  lavaux      13890 Jan 29 19:18 date.cpp
-r--r--r--   1 guilhem  lavaux       3989 Feb  8 19:18 datstrm.cpp
\end{verbatim}

But on Windows system, it will look like this:

\begin{verbatim}
winamp~1 exe    520196 02-25-1999  19:28  winamp204.exe
        1 file(s)           520 196 bytes
\end{verbatim}

Return value: true if the file list was successfully retrieved, false
otherwise.

\wxheading{See also}

\helpref{GetFilesList}{wxftpgetfileslist}

\membersection{wxFTP::GetFilesList}\label{wxftpgetfileslist}

\func{bool}{GetFilesList}{\param{wxArrayString\& }{files}, \param{const wxString\&}{ wildcard = ""}}

This function returns the computer-parsable list of the files in the current
directory (optionally only of the files matching the {\it wildcard}, all files
by default). This list always has the same format and contains one full
(including the directory path) file name per line.

Return value: true if the file list was successfully retrieved, false
otherwise.

% ----------------------------------------------------------------------------

\membersection{wxFTP::GetOutputStream}

\func{wxOutputStream *}{GetOutputStream}{\param{const wxString\&}{ file}}

Initializes an output stream to the specified {\it file}. The returned
stream has all but the seek functionality of wxStreams. When the user finishes
writing data, he has to delete the stream to close it.

\wxheading{Return value}

An initialized write-only stream.

\wxheading{See also}

\helpref{wxOutputStream}{wxoutputstream}

% ----------------------------------------------------------------------------

\membersection{wxFTP::GetInputStream}\label{wxftpgetinput}

\func{wxInputStream *}{GetInputStream}{\param{const wxString\&}{ path}}

Creates a new input stream on the the specified path. You can use all but the seek
functionality of wxStream. Seek isn't available on all streams. For example,
http or ftp streams do not deal with it. Other functions like Tell
are not available for this sort of stream, at present.
You will be notified when the EOF is reached by an error.

\wxheading{Return value}

Returns NULL if an error occurred (it could be a network failure or the fact
that the file doesn't exist).

Returns the initialized stream. You will have to delete it yourself when you
don't need it anymore. The destructor closes the DATA stream connection but
will leave the COMMAND stream connection opened. It means that you can still
send new commands without reconnecting.

\wxheading{Example of a standalone connection (without wxURL)}

\begin{verbatim}
  wxFTP ftp;
  wxInputStream *in_stream;
  char *data;

  ftp.Connect("a.host.domain");
  ftp.ChDir("a_directory");
  in_stream = ftp.GetInputStream("a_file_to_get");

  data = new char[in_stream->StreamSize()];

  in_stream->Read(data, in_stream->StreamSize());
  if (in_stream->LastError() != wxStream_NOERROR) {
    // Do something.
  }

  delete in_stream; /* Close the DATA connection */

  ftp.Close(); /* Close the COMMAND connection */
\end{verbatim}

\wxheading{See also}

\helpref{wxInputStream}{wxinputstream}