%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Name: socket.tex %% Purpose: wxSocket docs %% Author: Guillermo Rodriguez Garcia %% Modified by: %% Created: 1999 %% RCS-ID: $Id$ %% Copyright: (c) wxWindows team %% Licence: wxWindows licence %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \section{\class{wxSocketBase}}\label{wxsocketbase} \wxheading{Derived from} \helpref{wxEvtHandler}{wxevthandler} \wxheading{Include files} \wxheading{wxSocket errors} \twocolwidtha{7cm} \begin{twocollist}\itemsep=0pt \twocolitem{{\bf wxSOCKET\_NOERROR}}{No error happened.} \twocolitem{{\bf wxSOCKET\_INVOP}}{Invalid operation.} \twocolitem{{\bf wxSOCKET\_IOERR}}{Input/Output error.} \twocolitem{{\bf wxSOCKET\_INVADDR}}{Invalid address passed to wxSocket.} \twocolitem{{\bf wxSOCKET\_INVSOCK}}{Invalid socket (uninitialized).} \twocolitem{{\bf wxSOCKET\_NOHOST}}{No corresponding host.} \twocolitem{{\bf wxSOCKET\_INVPORT}}{Invalid port.} \twocolitem{{\bf wxSOCKET\_WOULDBLOCK}}{The socket is non-blocking and the operation would block.} \twocolitem{{\bf wxSOCKET\_TIMEDOUT}}{The timeout for this operation expired.} \twocolitem{{\bf wxSOCKET\_MEMERR}}{Memory exhausted.} \end{twocollist} \wxheading{wxSocket events} \twocolwidtha{7cm} \begin{twocollist}\itemsep=0pt \twocolitem{{\bf wxSOCKET\_INPUT}}{There is data available for reading.} \twocolitem{{\bf wxSOCKET\_OUTPUT}}{The socket is ready to be written to.} \twocolitem{{\bf wxSOCKET\_CONNECTION}}{Incoming connection (server), or connection establishment (client).} \twocolitem{{\bf wxSOCKET\_LOST}}{The connection has been closed.} \end{twocollist} A brief note on how to use these events: The {\bf wxSOCKET\_INPUT} event will be issued whenever there is data available for reading. This will be the case if the input queue was empty and new data arrives, or if the application has read some data yet there is still more data available. This means that the application does not need to read all available data in response to a {\bf wxSOCKET\_INPUT} event, as more events will be produced as necessary. The {\bf wxSOCKET\_OUTPUT} event is issued when a socket is first connected with \helpref{Connect}{wxsocketclientconnect} or accepted with \helpref{Accept}{wxsocketserveraccept}. After that, new events will be generated only after an output operation fails with {\bf wxSOCKET\_WOULDBLOCK} and buffer space becomes available again. This means that the application should assume that it can write data to the socket until an {\bf wxSOCKET\_WOULDBLOCK} error occurs; after this, whenever the socket becomes writable again the application will be notified with another {\bf wxSOCKET\_OUTPUT} event. The {\bf wxSOCKET\_CONNECTION} event is issued when a delayed connection request completes succesfully (client) or when a new connection arrives at the incoming queue (server). The {\bf wxSOCKET\_LOST} event is issued when a close indication is received for the socket. This means that the connection broke down or that it was closed by the peer. Also, this event will be issued if a delayed connection request fails. \wxheading{Event handling} To process events from a socket, use the following event handler macro to direct input to member functions that take a \helpref{wxSocketEvent}{wxsocketevent} argument. \twocolwidtha{7cm}% \begin{twocollist}\itemsep=0pt \twocolitem{{\bf EVT\_SOCKET(id, func)}}{A socket event occured.} \end{twocollist} \wxheading{See also} \helpref{wxSocketEvent}{wxsocketevent}, \helpref{wxSocketClient}{wxsocketclient}, \helpref{wxSocketServer}{wxsocketserver}, \helpref{Sockets sample}{samplesockets} % --------------------------------------------------------------------------- % Members % --------------------------------------------------------------------------- \latexignore{\rtfignore{\wxheading{Members}}} \membersection{wxSocketBase::wxSocketBase} \func{}{wxSocketBase}{\void} Default constructor. Don't use it; use \helpref{wxSocketClient}{wxsocketclient} or \helpref{wxSocketServer}{wxsocketserver}. \membersection{wxSocketBase::\destruct{wxSocketBase}} \func{}{\destruct{wxSocketBase}}{\void} Destructor. % --------------------------------------------------------------------------- % State functions % --------------------------------------------------------------------------- % % SetFlags % \membersection{wxSocketBase::SetFlags}\label{wxsocketbasesetflags} \func{void}{SetFlags}{\param{wxSocketBase::wxSockFlags}{ flags}} \twocolwidtha{7cm} \begin{twocollist}\itemsep=0pt \twocolitem{{\bf wxSOCKET\_NONE}}{Normal functionality.} \twocolitem{{\bf wxSOCKET\_NOWAIT}}{Read/write as much data as possible and return immediately.} \twocolitem{{\bf wxSOCKET\_WAITALL}}{Wait for all required data to be read/written unless an error occurs.} \twocolitem{{\bf wxSOCKET\_BLOCK}}{Block the GUI (do not yield) while reading/writing data.} \end{twocollist} A brief overview on how to use these flags follows. If no flag is specified (this is the same as {\bf wxSOCKET\_NONE}), IO calls will return after some data has been read or written, even when the transfer might not be complete. This is the same as issuing exactly one blocking low-level call to recv() or send(). Note that {\it blocking} here refers to when the function returns, not to whether the GUI blocks during this time. If {\bf wxSOCKET\_NOWAIT} is specified, IO calls will return immediately. Read operations will retrieve only available data. Write operations will write as much data as possible, depending on how much space is available in the output buffer. This is the same as issuing exactly one nonblocking low-level call to recv() or send(). Note that {\it nonblocking} here refers to when the function returns, not to whether the GUI blocks during this time. If {\bf wxSOCKET\_WAITALL} is specified, IO calls won't return until ALL the data has been read or written (or until an error occurs), blocking if necessary, and issuing several low level calls if necessary. This is the same as having a loop which makes as many blocking low-level calls to recv() or send() as needed so as to transfer all the data. Note that {\it blocking} here refers to when the function returns, not to whether the GUI blocks during this time. The {\bf wxSOCKET\_BLOCK} flag controls whether the GUI blocks during IO operations. If this flag is specified, the socket will not yield during IO calls, so the GUI will remain blocked until the operation completes. If it is not used, then the application must take extra care to avoid unwanted reentrance. So: {\bf wxSOCKET\_NONE} will try to read at least SOME data, no matter how much. {\bf wxSOCKET\_NOWAIT} will always return immediately, even if it cannot read or write ANY data. {\bf wxSOCKET\_WAITALL} will only return when it has read or written ALL the data. {\bf wxSOCKET\_BLOCK} has nothing to do with the previous flags and it controls whether the GUI blocks. % % SetNotify % \membersection{wxSocketBase::SetNotify}\label{wxsocketbasesetnotify} \func{void}{SetNotify}{\param{wxSocketEventFlags}{ flags}} SetNotify specifies which socket events are to be sent to the event handler. The {\it flags} parameter is a combination of flags ORed toghether. The following flags can be used: \twocolwidtha{7cm} \begin{twocollist}\itemsep=0pt \twocolitem{{\bf wxSOCKET\_INPUT\_FLAG}}{to receive wxSOCKET\_INPUT} \twocolitem{{\bf wxSOCKET\_OUTPUT\_FLAG}}{to receive wxSOCKET\_OUTPUT} \twocolitem{{\bf wxSOCKET\_CONNECTION\_FLAG}}{to receive wxSOCKET\_CONNECTION} \twocolitem{{\bf wxSOCKET\_LOST\_FLAG}}{to receive wxSOCKET\_LOST} \end{twocollist} For example: \begin{verbatim} sock.SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG); sock.Notify(TRUE); \end{verbatim} In this example, the user will be notified about incoming socket data and whenever the connection is closed. For more information on socket events see \helpref{wxSocket events}{wxsocketbase}. % % SetTimeout % \membersection{wxSocketBase::SetTimeout}\label{wxsocketbasesettimeout} \func{void}{SetTimeout}{\param{int }{seconds}} This function sets the default socket timeout in seconds. This timeout applies to all IO calls, and also to the \helpref{Wait}{wxsocketbasewait} family of functions if you don't specify a wait interval. Initially, the default is set to 10 minutes. % % Notify % \membersection{wxSocketBase::Notify}\label{wxsocketbasenotify} \func{void}{Notify}{\param{bool}{ notify}} According to the {\it notify} value, this function enables or disables socket events. If {\it notify} is TRUE, the events configured with \helpref{SetNotify}{wxsocketbasesetnotify} will be sent to the application. If {\it notify} is FALSE; no events will be sent. % % Ok % \membersection{wxSocketBase::Ok}\label{wxsocketbaseok} \constfunc{bool}{Ok}{\void} Returns TRUE if the socket is initialized and ready and FALSE in other cases. \membersection{wxSocketBase::Error}\label{wxsocketbaseerror} \constfunc{bool}{Error}{\void} Returns TRUE if an error occured in the last IO operation. Use this function to check for an error condition after one of the following calls: Read, Write, ReadMsg, WriteMsg, Peek, Unread, Discard. \membersection{wxSocketBase::IsConnected}\label{wxsocketbaseisconnected} \constfunc{bool}{IsConnected}{\void} Returns TRUE if the socket is connected. \membersection{wxSocketBase::IsData}\label{wxsocketbaseisdata} \constfunc{bool}{IsData}{\void} Returns TRUE if there is data available to be read. \membersection{wxSocketBase::IsDisconnected}\label{wxsocketbasedisconnected} \constfunc{bool}{IsDisconnected}{\void} Returns TRUE if the socket is not connected. \membersection{wxSocketBase::LastCount}\label{wxsocketbaselastcount} \constfunc{wxUint32}{LastCount}{\void} Returns the number of bytes read or written by the last IO call. Use this function to get the number of bytes actually transferred after using one of the following IO calls: Read, Write, ReadMsg, WriteMsg, Peek, Unread, Discard. \membersection{wxSocketBase::LastError}\label{wxsocketbaselasterror} \constfunc{wxSocketError}{LastError}{\void} Returns the last wxSocket error. See \helpref{wxSocket errors}{wxsocketbase}. Please note that this function merely returns the last error code, but it should not be used to determine if an error has occured (this is because successful operations do not change the LastError value). Use \helpref{Error}{wxsocketbaseerror} first, in order to determine if the last IO call failed. If this returns TRUE, use LastError() to discover the cause of the error. % --------------------------------------------------------------------------- % IO calls % --------------------------------------------------------------------------- % % Peek % \membersection{wxSocketBase::Peek}\label{wxsocketbasepeek} \func{wxSocketBase\&}{Peek}{\param{char *}{ buffer}, \param{wxUint32}{ nbytes}} This function peeks a buffer of {\it nbytes} bytes from the socket. Peeking a buffer doesn't delete it from the socket input queue. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually peeked. Use \helpref{Error}{wxsocketbaseerror} to determine if the operation succeeded. \wxheading{Parameters} \docparam{buffer}{Buffer where to put peeked data.} \docparam{nbytes}{Number of bytes.} \wxheading{Return value} Returns a reference to the current object. \wxheading{Remark/Warning} The exact behaviour of wxSocketBase::Peek() depends on the combination of flags being used. For a detailed explanation, see \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags} \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags} % % Read % \membersection{wxSocketBase::Read}\label{wxsocketbaseread} \func{wxSocketBase\&}{Read}{\param{char *}{ buffer}, \param{wxUint32}{ nbytes}} This function reads a buffer of {\it nbytes} bytes from the socket. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually read. Use \helpref{Error}{wxsocketbaseerror} to determine if the operation succeeded. \wxheading{Parameters} \docparam{buffer}{Buffer where to put read data.} \docparam{nbytes}{Number of bytes.} \wxheading{Return value} Returns a reference to the current object. \wxheading{Remark/Warning} The exact behaviour of wxSocketBase::Read() depends on the combination of flags being used. For a detailed explanation, see \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}. \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags} % % Write % \membersection{wxSocketBase::Write}\label{wxsocketbasewrite} \func{wxSocketBase\&}{Write}{\param{const char *}{ buffer}, \param{wxUint32}{ nbytes}} This function writes a buffer of {\it nbytes} bytes to the socket. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually written. Use \helpref{Error}{wxsocketbaseerror} to determine if the operation succeeded. \wxheading{Parameters} \docparam{buffer}{Buffer with the data to be sent.} \docparam{nbytes}{Number of bytes.} \wxheading{Return value} Returns a reference to the current object. \wxheading{Remark/Warning} The exact behaviour of wxSocketBase::Write() depends on the combination of flags being used. For a detailed explanation, see \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}. \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags} % % WriteMsg % \membersection{wxSocketBase::WriteMsg}\label{wxsocketbasewritemsg} \func{wxSocketBase\&}{WriteMsg}{\param{const char *}{ buffer}, \param{wxUint32}{ nbytes}} This function writes a buffer of {\it nbytes} bytes from the socket, but it writes a short header before so that \helpref{ReadMsg}{wxsocketbasereadmsg} knows how much data should it actually read. So, a buffer sent with WriteMsg {\bf must} be read with ReadMsg. This function always waits for the entire buffer to be sent, unless an error occurs. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually written. Use \helpref{Error}{wxsocketbaseerror} to determine if the operation succeeded. \wxheading{Parameters} \docparam{buffer}{Buffer with the data to be sent.} \docparam{nbytes}{Number of bytes to send.} \wxheading{Return value} Returns a reference to the current object. \wxheading{Remark/Warning} wxSocketBase::WriteMsg() will behave as if the {\bf wxSOCKET\_WAITALL} flag was always set and it will always ignore the {\bf wxSOCKET\_NOWAIT} flag. The exact behaviour of WriteMsg depends on the {\bf wxSOCKET\_BLOCK} flag. For a detailed explanation, see \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}. \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}, \helpref{wxSocketBase::ReadMsg}{wxsocketbasereadmsg} % % ReadMsg % \membersection{wxSocketBase::ReadMsg}\label{wxsocketbasereadmsg} \func{wxSocketBase\&}{ReadMsg}{\param{char *}{ buffer}, \param{wxUint32}{ nbytes}} This function reads a buffer sent by \helpref{WriteMsg}{wxsocketbasewritemsg} on a socket. If the buffer passed to the function isn't big enough, the remaining bytes will be discarded. This function always waits for the buffer to be entirely filled, unless an error occurs. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually read. Use \helpref{Error}{wxsocketbaseerror} to determine if the operation succeeded. \wxheading{Parameters} \docparam{buffer}{Buffer where to put read data.} \docparam{nbytes}{Size of the buffer.} \wxheading{Return value} Returns a reference to the current object. \wxheading{Remark/Warning} wxSocketBase::ReadMsg() will behave as if the {\bf wxSOCKET\_WAITALL} flag was always set and it will always ignore the {\bf wxSOCKET\_NOWAIT} flag. The exact behaviour of ReadMsg depends on the {\bf wxSOCKET\_BLOCK} flag. For a detailed explanation, see \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}. \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags}, \helpref{wxSocketBase::WriteMsg}{wxsocketbasewritemsg} % % Unread % \membersection{wxSocketBase::Unread}\label{wxsocketbaseunread} \func{wxSocketBase\&}{Unread}{\param{const char *}{ buffer}, \param{wxUint32}{ nbytes}} This function unreads a buffer. That is, the data in the buffer is put back in the incoming queue. This function is not affected by wxSocket flags. If you use \helpref{LastCount}{wxsocketbaselastcount}, it will always return {\it nbytes}. If you use \helpref{Error}{wxsocketbaseerror}, it will always return FALSE. \wxheading{Parameters} \docparam{buffer}{Buffer to be unread.} \docparam{nbytes}{Number of bytes.} \wxheading{Return value} Returns a reference to the current object. \wxheading{See also} \helpref{wxSocketBase::Error}{wxsocketbaseerror}, \helpref{wxSocketBase::LastCount}{wxsocketbaselastcount}, \helpref{wxSocketBase::LastError}{wxsocketbaselasterror} % % Discard % \membersection{wxSocketBase::Discard}\label{wxsocketbasediscard} \func{wxSocketBase\&}{Discard}{\void} This function simply deletes all bytes in the incoming queue. This function always returns immediately and its operation is not affected by IO flags. Use \helpref{LastCount}{wxsocketbaselastcount} to verify the number of bytes actually discarded. If you use \helpref{Error}{wxsocketbaseerror}, it will always return FALSE. % --------------------------------------------------------------------------- % Wait functions % --------------------------------------------------------------------------- \membersection{wxSocketBase::Wait}\label{wxsocketbasewait} \func{bool}{Wait}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until one of the following conditions is TRUE. Note that it is recommended to use the individual Wait functions to wait for the required condition, instead of this one. \begin{itemize} \item There is data available for reading. \item The socket becomes writable. \item An ongoing connection request has completed (only for clients) \item An incoming connection request has arrived (only for servers) \item The connection has been closed. \end{itemize} \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} Returns TRUE when any of the above conditions is satisfied, FALSE if the timeout was reached. \wxheading{See also} \helpref{wxSocketBase::WaitForRead}{wxsocketbasewaitforread}, \helpref{wxSocketBase::WaitForWrite}{wxsocketbasewaitforwrite}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost} % % WaitForRead % \membersection{wxSocketBase::WaitForRead}\label{wxsocketbasewaitforread} \func{bool}{WaitForRead}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until there is data available to be read, or until an error occurs. \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} Returns TRUE if there is data to be read, FALSE if the timeout was reached or an error occured. \wxheading{See also} \helpref{wxSocketBase::Wait}{wxsocketbasewait}, \helpref{wxSocketBase::WaitForWrite}{wxsocketbasewaitforwrite}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost} % % WaitForWrite % \membersection{wxSocketBase::WaitForWrite}\label{wxsocketbasewaitforwrite} \func{bool}{WaitForWrite}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until the socket is ready to send data, or until an error occurs. \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} Returns TRUE if you can write to the socket, FALSE if the timeout was reached or an error occured. \wxheading{See also} \helpref{wxSocketBase::Wait}{wxsocketbasewait}, \helpref{wxSocketBase::WaitForRead}{wxsocketbasewaitforread}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost} % % WaitForLost % \membersection{wxSocketBase::WaitForLost}\label{wxsocketbasewaitforlost} \func{bool}{Wait}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until the connection is lost. This may happen if the peer gracefully closes the connection or if the connection breaks. \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} Returns TRUE if the connection was lost, FALSE if the timeout was reached. \wxheading{See also} \helpref{wxSocketBase::WaitForRead}{wxsocketbasewaitforread}, \helpref{wxSocketBase::WaitForWrite}{wxsocketbasewaitforwrite}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost} % --------------------------------------------------------------------------- % Socket state % --------------------------------------------------------------------------- % % RestoreState % \membersection{wxSocketBase::RestoreState}\label{wxsocketbaserestorestate} \func{void}{RestoreState}{\void} This function restores the previous state of the socket, as saved with \helpref{SaveState}{wxsocketbasesavestate} Calls to SaveState and RestoreState can be nested. \wxheading{See also} \helpref{wxSocketBase::SaveState}{wxsocketbasesavestate} % % SaveState % \membersection{wxSocketBase::SaveState}\label{wxsocketbasesavestate} \func{void}{SaveState}{\void} This function saves the current state of the socket in a stack. Socket state includes flags, as set with \helpref{SetFlags}{wxsocketbasesetflags}, event mask, as set with \helpref{SetNotify}{wxsocketbasesetnotify} and \helpref{Notify}{wxsocketbasenotify}, and current settings for the asynchronous callbacks, as set with \helpref{Callback}{wxsocketbasecallback} and \helpref{CallbackData}{wxsocketbasecallbackdata}. Calls to SaveState and RestoreState can be nested. \wxheading{See also} \helpref{wxSocketBase::RestoreState}{wxsocketbaserestorestate} % % GetLocal % \membersection{wxSocketBase::GetLocal}\label{wxsocketbasegetlocal} \constfunc{bool}{GetLocal}{\param{wxSockAddress\& }{addr\_man}} This function returns the local address field of the socket. The local address field contains the complete local address of the socket (local address, local port, ...). \wxheading{Return value} It returns TRUE if no errors happened, FALSE otherwise. % % GetPeer % \membersection{wxSocketBase::GetPeer}\label{wxsocketbasegetpeer} \constfunc{bool}{GetPeer}{\param{wxSockAddress\& }{addr\_man}} This function returns the peer address field of the socket. The peer address field contains the complete peer host address of the socket (address, port, ...). \wxheading{Return value} It returns TRUE if no errors happened, FALSE otherwise. % --------------------------------------------------------------------------- % Socket callbacks % --------------------------------------------------------------------------- \membersection{wxSocketBase::SetEventHandler}\label{wxsocketbaseseteventhandler} \func{void}{SetEventHandler}{\param{wxEvtHandler\&}{ evt\_hdlr}, \param{int}{ id = -1}} Sets an event handler to be called when a socket event occurs. The handler will be called for those events for which notification is enabled with \helpref{SetNotify}{wxsocketbasesetnotify} and \helpref{Notify}{wxsocketbasenotify}. You can also specify a callback function to be called when an event occurs, although if possible, events should be used instead of callbacks. See \helpref{Callback}{wxsocketbasecallback} and \helpref{CallbackData}{wxsocketbasecallbackdata}. \wxheading{Parameters} \docparam{evt\_hdlr}{Specifies the event handler you want to use.} \docparam{id}{The id of socket event.} \wxheading{See also} \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify}, \helpref{wxSocketEvent}{wxsocketevent}, \helpref{wxEvtHandler}{wxevthandler}, \helpref{wxSocketBase::Callback}{wxsocketbasecallback}, \helpref{wxSocketBase::CallbackData}{wxsocketbasecallbackdata} \membersection{wxSocketBase::Callback}\label{wxsocketbasecallback} \func{wxSocketBase::wxSockCbk}{Callback}{\param{wxSocketBase::wxSockCbk}{ callback}} You can setup a callback function to be called when an event occurs. The function will be called only for those events for which notification has been enabled with \helpref{Notify}{wxsocketbasenotify} and \helpref{SetNotify}{wxsocketbasesetnotify}. The prototype of the callback must be as follows: \begin{verbatim} void SocketCallback(wxSocketBase& sock, wxSocketNotify evt, char *cdata); \end{verbatim} The first parameter is a reference to the socket object in which the event occured. The second parameter tells you which event occured. (See \helpref{wxSocket events}{wxsocketbase}). The third parameter is the user data you specified using \helpref{CallbackData}{wxsocketbasecallbackdata}. Note that events are preferred over callbacks where possible. \wxheading{Return value} A pointer to the previous callback. \wxheading{See also} \helpref{wxSocketBase::CallbackData}{wxsocketbasecallbackdata}, \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify} \membersection{wxSocketBase::CallbackData}\label{wxsocketbasecallbackdata} \func{char *}{CallbackData}{\param{char *}{cdata}} This function sets the the user data which will be passed to a callback function set via \helpref{Callback}{wxsocketbasecallback}. Note that events are preferred over callbacks where possible. \wxheading{Return value} A pointer to the previous user data. \helpref{wxSocketBase::Callback}{wxsocketbasecallback}, \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify} % --------------------------------------------------------------------------- % CLASS wxSocketClient % --------------------------------------------------------------------------- \section{\class{wxSocketClient}}\label{wxsocketclient} \wxheading{Derived from} \helpref{wxSocketBase}{wxsocketbase} \wxheading{Include files} % --------------------------------------------------------------------------- % Members % --------------------------------------------------------------------------- % % wxSocketClient % \membersection{wxSocketClient::wxSocketClient} \func{}{wxSocketClient}{\param{wxSockFlags}{ flags = wxSocketBase::NONE}} Constructor. \wxheading{Parameters} \docparam{flags}{Socket flags (See \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags})} % % ~wxSocketClient % \membersection{wxSocketClient::\destruct{wxSocketClient}} \func{}{\destruct{wxSocketClient}}{\void} Destructor. % % Connect % \membersection{wxSocketClient::Connect}\label{wxsocketclientconnect} \func{bool}{Connect}{\param{wxSockAddress\&}{ address}, \param{bool}{ wait = TRUE}} Connects to a server using the specified address. If {\it wait} is TRUE, Connect will wait until the connection completes. {\bf Warning:} This will block the GUI. If {\it wait} is FALSE, Connect will try to establish the connection and return immediately, without blocking the GUI. When used this way, even if Connect returns FALSE, the connection request can be completed later. To detect this, use \helpref{WaitOnConnect}{wxsocketclientwaitonconnect}, or catch {\bf wxSOCKET\_CONNECTION} events (for successful establishment) and {\bf wxSOCKET\_LOST} events (for connection failure). \wxheading{Parameters} \docparam{address}{Address of the server.} \docparam{wait}{If TRUE, waits for the connection to complete.} \wxheading{Return value} Returns TRUE if the connection is established and no error occurs. If {\it wait} was TRUE, and Connect returns FALSE, an error occured and the connection failed. If {\it wait} was FALSE, and Connect returns FALSE, you should still be prepared to handle the completion of this connection request, either with \helpref{WaitOnConnect}{wxsocketclientwaitonconnect} or by watching {\bf wxSOCKET\_CONNECTION} and {\bf wxSOCKET\_LOST} events. \wxheading{See also} \helpref{wxSocketClient::WaitOnConnect}{wxsocketclientwaitonconnect}, \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify} % % WaitOnConnect % \membersection{wxSocketClient::WaitOnConnect}\label{wxsocketclientwaitonconnect} \func{bool}{WaitOnConnect}{\param{long}{ seconds = -1}, \param{long}{ milliseconds = 0}} Wait until a connection request completes, or until the specified timeout elapses. Use this function after issuing a call to \helpref{Connect}{wxsocketclientconnect} with {\it wait} set to FALSE. \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} If the connection is succesfully established, returns TRUE. If the timeout expires, or if the connection fails, returns FALSE. To distinguish between these two conditions, use \helpref{IsConnected}{wxsocketbaseisconnected} \wxheading{See also} \helpref{wxSocketClient::Connect}{wxsocketclientconnect}, \helpref{wxSocketBase::IsConnected}{wxsocketbaseisconnected} % --------------------------------------------------------------------------- % CLASS: wxSocketEvent % --------------------------------------------------------------------------- \section{\class{wxSocketEvent}}\label{wxsocketevent} This event class contains information about socket events. \wxheading{Derived from} \helpref{wxEvent}{wxevent} \wxheading{Include files} \wxheading{Event table macros} To process a socket event, use these event handler macros to direct input to member functions that take a wxSocketEvent argument. \twocolwidtha{7cm} \begin{twocollist}\itemsep=0pt \twocolitem{{\bf EVT\_SOCKET(id, func)}}{Process a socket event, supplying the member function.} \end{twocollist} \wxheading{See also} \helpref{wxSocketBase}{wxsocketbase}, \helpref{wxSocketClient}{wxsocketclient}, \helpref{wxSocketServer}{wxsocketserver} \latexignore{\rtfignore{\wxheading{Members}}} \membersection{wxSocketEvent::wxSocketEvent} \func{}{wxSocketEvent}{\param{int}{ id = 0}} Constructor. \membersection{wxSocketEvent::Socket}\label{wxsocketeventsocket} \constfunc{wxSocketBase *}{Socket}{\void} Returns the socket object to which this event refers to. This makes it possible to use the same event handler for different sockets. \membersection{wxSocketEvent::SocketEvent}\label{wxsocketeventsocketevent} \constfunc{wxSocketNotify}{SocketEvent}{\void} Returns the socket event type. % --------------------------------------------------------------------------- % CLASS: wxSocketServer % --------------------------------------------------------------------------- \section{\class{wxSocketServer}}\label{wxsocketserver} \wxheading{Derived from} \helpref{wxSocketBase}{wxsocketbase} \wxheading{Include files} % --------------------------------------------------------------------------- % Members % --------------------------------------------------------------------------- \latexignore{\rtfignore{\wxheading{Members}}} % % wxSocketServer % \membersection{wxSocketServer::wxSocketServer}\label{wxsocketserverconstr} \func{}{wxSocketServer}{\param{wxSockAddress\&}{ address}, \param{wxSockFlags}{ flags = wxSocketBase::NONE}} Constructs a new server and tries to bind to the specified {\it address}. Before trying to accept new connections, test whether it succeeded with \helpref{wxSocketBase::Ok}{wxsocketbaseok}. \wxheading{Parameters} \docparam{address}{Specifies the local address for the server (e.g. port number).} \docparam{flags}{Socket flags (See \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags})} % % ~wxSocketServer % \membersection{wxSocketServer::\destruct{wxSocketServer}} \func{}{\destruct{wxSocketServer}}{\void} Destructor (it doesn't close the accepted connections). % % Accept % \membersection{wxSocketServer::Accept}\label{wxsocketserveraccept} \func{wxSocketBase *}{Accept}{\param{bool}{ wait = TRUE}} Accepts an incoming connection request, and creates a new \helpref{wxSocketBase}{wxsocketbase} object which represents the server-side of the connection. If {\it wait} is TRUE and there are no pending connections to be accepted, it will wait for the next incoming connection to arrive. {\bf Warning:} This will block the GUI. If {\it wait} is FALSE, it will try to accept a pending connection if there is one, but it will always return immediately without blocking the GUI. If you want to use Accept in this way, you can either check for incoming connections with \helpref{WaitForAccept}{wxsocketserverwaitforaccept} or catch {\bf wxSOCKET\_CONNECTION} events, then call Accept() once you know that there is an incoming connection waiting to be accepted. \wxheading{Return value} Returns an opened socket connection, or NULL if an error occured or if the {\it wait} parameter was FALSE and there were no pending connections. \wxheading{See also} \helpref{wxSocketServer::WaitForAccept}{wxsocketserverwaitforaccept}, \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify}, \helpref{wxSocketServer::AcceptWith}{wxsocketserveracceptwith} % % AcceptWith % \membersection{wxSocketServer::AcceptWith}\label{wxsocketserveracceptwith} \func{bool}{AcceptWith}{\param{wxSocketBase\&}{ socket}, \param{bool}{ wait = TRUE}} Accept an incoming connection using the specified socket object. \wxheading{Parameters} \docparam{socket}{Socket to be initialized} \wxheading{Return value} Returns TRUE on success, or FALSE if an error occured or if the {\it wait} parameter was FALSE and there were no pending connections. \helpref{wxSocketServer::WaitForAccept}{wxsocketserverwaitforaccept}, \helpref{wxSocketBase::SetNotify}{wxsocketbasesetnotify}, \helpref{wxSocketBase::Notify}{wxsocketbasenotify}, \helpref{wxSocketServer::Accept}{wxsocketserveraccept} for a detailed explanation % % WaitForAccept % \membersection{wxSocketServer::WaitForAccept}\label{wxsocketserverwaitforaccept} \func{bool}{WaitForAccept}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits for an incoming connection. Use it if you want to call \helpref{Accept}{wxsocketserveraccept} or \helpref{AcceptWith}{wxsocketserveracceptwith} with {\it wait} set to FALSE, to detect when an incoming connection is waiting to be accepted. \wxheading{Parameters} \docparam{seconds}{Number of seconds to wait. If -1, it will wait for the default timeout, as set with \helpref{SetTimeout}{wxsocketbasesettimeout}.} \docparam{millisecond}{Number of milliseconds to wait.} \wxheading{Return value} Returns TRUE if an incoming connection arrived, FALSE if the timeout elapsed. \wxheading{See also} \helpref{wxSocketServer::Accept}{wxsocketserveraccept}, \helpref{wxSocketServer::AcceptWith}{wxsocketserveracceptwith}