%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Name: socket.tex %% Purpose: wxSocket docs %% Author: Guillermo Rodriguez Garcia %% Modified by: %% Created: 1999 %% RCS-ID: $Id$ %% Copyright: (c) wxWidgets team %% License: wxWindows license %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \section{\class{wxSocketBase}}\label{wxsocketbase} wxSocketBase is the base class for all socket-related objects, and it defines all basic IO functionality. Note: (Workaround for implementation limitation for wxWidgets up to 2.5.x) If you want to use sockets or derived classes such as wxFTP in a secondary thread, call wxSocketBase::Initialize() (undocumented) from the main thread before creating any sockets - in wxApp::OnInit for example. See http://wiki.wxwidgets.org/wiki.pl?WxSocket or http://www.litwindow.com/knowhow/knowhow.html for more details. \wxheading{Derived from} \helpref{wxObject}{wxobject} \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 request (server), or successful 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 successfully (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 connection request fails. \wxheading{Event handling} To process events coming from a socket object, use the following event handler macro to direct events to member functions that take a \helpref{wxSocketEvent}{wxsocketevent} argument. \twocolwidtha{7cm}% \begin{twocollist}\itemsep=0pt \twocolitem{{\bf EVT\_SOCKET(id, func)}}{Process a wxEVT\_SOCKET event.} \end{twocollist} \wxheading{See also} \helpref{wxSocketEvent}{wxsocketevent}, \helpref{wxSocketClient}{wxsocketclient}, \helpref{wxSocketServer}{wxsocketserver}, \helpref{Sockets sample}{samplesockets} % --------------------------------------------------------------------------- % Function groups % --------------------------------------------------------------------------- \latexignore{\rtfignore{\wxheading{Function groups}}} \membersection{Construction and destruction}\label{socketconstruction} \helpref{wxSocketBase}{wxsocketbaseconstruct}\\ \helpref{\destruct{wxSocketBase}}{wxsocketbasedestruct}\\ \helpref{Destroy}{wxsocketbasedestroy} \membersection{Socket state}\label{socketstate} Functions to retrieve current state and miscellaneous info. \helpref{Error}{wxsocketbaseerror}\\ \helpref{GetLocal}{wxsocketbasegetlocal}\\ \helpref{GetPeer}{wxsocketbasegetpeer} \helpref{IsConnected}{wxsocketbaseisconnected}\\ \helpref{IsData}{wxsocketbaseisdata}\\ \helpref{IsDisconnected}{wxsocketbaseisdisconnected}\\ \helpref{LastCount}{wxsocketbaselastcount}\\ \helpref{LastError}{wxsocketbaselasterror}\\ \helpref{Ok}{wxsocketbaseok}\\ \helpref{SaveState}{wxsocketbasesavestate}\\ \helpref{RestoreState}{wxsocketbaserestorestate} \membersection{Basic IO}\label{socketbasicio} Functions that perform basic IO functionality. \helpref{Close}{wxsocketbaseclose}\\ \helpref{Discard}{wxsocketbasediscard}\\ \helpref{Peek}{wxsocketbasepeek}\\ \helpref{Read}{wxsocketbaseread}\\ \helpref{ReadMsg}{wxsocketbasereadmsg}\\ \helpref{Unread}{wxsocketbaseunread}\\ \helpref{Write}{wxsocketbasewrite}\\ \helpref{WriteMsg}{wxsocketbasewritemsg} Functions that perform a timed wait on a certain IO condition. \helpref{InterruptWait}{wxsocketbaseinterruptwait}\\ \helpref{Wait}{wxsocketbasewait}\\ \helpref{WaitForLost}{wxsocketbasewaitforlost}\\ \helpref{WaitForRead}{wxsocketbasewaitforread}\\ \helpref{WaitForWrite}{wxsocketbasewaitforwrite}\\ and also: \helpref{wxSocketServer::WaitForAccept}{wxsocketserverwaitforaccept}\\ \helpref{wxSocketClient::WaitOnConnect}{wxsocketclientwaitonconnect} Functions that allow applications to customize socket IO as needed. \helpref{GetFlags}{wxsocketbasegetflags}\\ \helpref{SetFlags}{wxsocketbasesetflags}\\ \helpref{SetTimeout}{wxsocketbasesettimeout}\\ \helpref{SetLocal}{wxsocketbasesetlocal}\\ \membersection{Handling socket events}\label{socketevents} Functions that allow applications to receive socket events. \helpref{Notify}{wxsocketbasenotify}\\ \helpref{SetNotify}{wxsocketbasesetnotify}\\ \helpref{GetClientData}{wxsocketbasegetclientdata}\\ \helpref{SetClientData}{wxsocketbasesetclientdata}\\ \helpref{SetEventHandler}{wxsocketbaseseteventhandler} % --------------------------------------------------------------------------- % Members here % --------------------------------------------------------------------------- \helponly{\insertatlevel{2}{ \wxheading{Members} }} \membersection{wxSocketBase::wxSocketBase}\label{wxsocketbaseconstruct} \func{}{wxSocketBase}{\void} Default constructor. Don't use it directly; instead, use \helpref{wxSocketClient}{wxsocketclient} to construct a socket client, or \helpref{wxSocketServer}{wxsocketserver} to construct a socket server. \membersection{wxSocketBase::\destruct{wxSocketBase}}\label{wxsocketbasedestruct} \func{}{\destruct{wxSocketBase}}{\void} Destructor. Do not destroy a socket using the delete operator directly; use \helpref{Destroy}{wxsocketbasedestroy} instead. Also, do not create socket objects in the stack. % % Close % \membersection{wxSocketBase::Close}\label{wxsocketbaseclose} \func{void}{Close}{\void} This function shuts down the socket, disabling further transmission and reception of data; it also disables events for the socket and frees the associated system resources. Upon socket destruction, Close is automatically called, so in most cases you won't need to do it yourself, unless you explicitly want to shut down the socket, typically to notify the peer that you are closing the connection. \wxheading{Remark/Warning} Although Close immediately disables events for the socket, it is possible that event messages may be waiting in the application's event queue. The application must therefore be prepared to handle socket event messages even after calling Close. % % Destroy % \membersection{wxSocketBase::Destroy}\label{wxsocketbasedestroy} \func{bool}{Destroy}{\void} Destroys the socket safely. Use this function instead of the delete operator, since otherwise socket events could reach the application even after the socket has been destroyed. To prevent this problem, this function appends the wxSocket to a list of object to be deleted on idle time, after all events have been processed. For the same reason, you should avoid creating socket objects in the stack. Destroy calls \helpref{Close}{wxsocketbaseclose} automatically. \wxheading{Return value} Always true. % % 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. % % Error % \membersection{wxSocketBase::Error}\label{wxsocketbaseerror} \constfunc{bool}{Error}{\void} Returns true if an error occurred in the last IO operation. Use this function to check for an error condition after one of the following calls: Discard, Peek, Read, ReadMsg, Unread, Write, WriteMsg. % % GetClientData % \membersection{wxSocketBase::GetClientData}\label{wxsocketbasegetclientdata} \constfunc{void *}{GetClientData}{\void} Returns a pointer of the client data for this socket, as set with \helpref{SetClientData}{wxsocketbasesetclientdata} % % GetLocal % \membersection{wxSocketBase::GetLocal}\label{wxsocketbasegetlocal} \constfunc{bool}{GetLocal}{\param{wxSockAddress\& }{addr}} 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} true if no error happened, false otherwise. % % GetFlags % \membersection{wxSocketBase::GetFlags}\label{wxsocketbasegetflags} \constfunc{wxSocketFlags}{GetFlags}{\void} Returns current IO flags, as set with \helpref{SetFlags}{wxsocketbasesetflags} % % GetPeer % \membersection{wxSocketBase::GetPeer}\label{wxsocketbasegetpeer} \constfunc{bool}{GetPeer}{\param{wxSockAddress\& }{addr}} 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} true if no error happened, false otherwise. % % InterruptWait % \membersection{wxSocketBase::InterruptWait}\label{wxsocketbaseinterruptwait} \func{void}{InterruptWait}{\void} Use this function to interrupt any wait operation currently in progress. Note that this is not intended as a regular way to interrupt a Wait call, but only as an escape mechanism for exceptional situations where it is absolutely necessary to use it, for example to abort an operation due to some exception or abnormal problem. InterruptWait is automatically called when you \helpref{Close}{wxsocketbaseclose} a socket (and thus also upon socket destruction), so you don't need to use it in these cases. \helpref{wxSocketBase::Wait}{wxsocketbasewait}, \helpref{wxSocketServer::WaitForAccept}{wxsocketserverwaitforaccept}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost}, \helpref{wxSocketBase::WaitForRead}{wxsocketbasewaitforread}, \helpref{wxSocketBase::WaitForWrite}{wxsocketbasewaitforwrite}, \helpref{wxSocketClient::WaitOnConnect}{wxsocketclientwaitonconnect} % % IsConnected % \membersection{wxSocketBase::IsConnected}\label{wxsocketbaseisconnected} \constfunc{bool}{IsConnected}{\void} Returns true if the socket is connected. % % IsData % \membersection{wxSocketBase::IsData}\label{wxsocketbaseisdata} \constfunc{bool}{IsData}{\void} This function waits until the socket is readable. This might mean that queued data is available for reading or, for streamed sockets, that the connection has been closed, so that a read operation will complete immediately without blocking (unless the {\bf wxSOCKET\_WAITALL} flag is set, in which case the operation might still block). \membersection{wxSocketBase::IsDisconnected}\label{wxsocketbaseisdisconnected} % % IsDisconnected % \constfunc{bool}{IsDisconnected}{\void} Returns true if the socket is not connected. \membersection{wxSocketBase::LastCount}\label{wxsocketbaselastcount} % % LastCount % \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: Discard, Peek, Read, ReadMsg, Unread, Write, WriteMsg. % % LastError % \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 occurred (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. % % 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. \wxheading{Remark/Warning} For \helpref{wxSocketClient}{wxsocketclient}, Ok won't return true unless the client is connected to a server. For \helpref{wxSocketServer}{wxsocketserver}, Ok will return true if the server could bind to the specified address and is already listening for new connections. Ok does not check for IO errors; use \helpref{Error}{wxsocketbaseerror} instead for that purpose. % % 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}, user data, as set with \helpref{SetClientData}{wxsocketbasesetclientdata}. Calls to SaveState and RestoreState can be nested. \wxheading{See also} \helpref{wxSocketBase::RestoreState}{wxsocketbaserestorestate} % % SetClientData % \membersection{wxSocketBase::SetClientData}\label{wxsocketbasesetclientdata} \func{void}{SetClientData}{\param{void *}{data}} Sets user-supplied client data for this socket. All socket events will contain a pointer to this data, which can be retrieved with the \helpref{wxSocketEvent::GetClientData}{wxsocketeventgetclientdata} function. % % SetEventHandler % \membersection{wxSocketBase::SetEventHandler}\label{wxsocketbaseseteventhandler} \func{void}{SetEventHandler}{\param{wxEvtHandler\&}{ handler}, \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}. \wxheading{Parameters} \docparam{handler}{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} % % SetFlags % \membersection{wxSocketBase::SetFlags}\label{wxsocketbasesetflags} \func{void}{SetFlags}{\param{wxSocketFlags}{ flags}} Use SetFlags to customize IO operation for this socket. The {\it flags} parameter may be a combination of flags ORed together. The following flags can be used: \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.} \twocolitem{{\bf wxSOCKET\_REUSEADDR}}{Allows the use of an in-use port (wxServerSocket only)} \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. The {\bf wxSOCKET\_REUSEADDR} flag controls the use of the SO\_REUSEADDR standard setsockopt() flag. This flag allows the socket to bind to a port that is already in use. This is mostly used on UNIX-based systems to allow rapid starting and stopping of a server - otherwise you may have to wait several minutes for the port to become available. wxSOCKET\_REUSEADDR can also be used with socket clients to (re)bind to a particular local port for an outgoing connection. This option can have surprising platform dependent behavior, so check the documentation for your platform's implementation of setsockopt(). Note that on BSD-based systems (e.g. Mac OS X), use of wxSOCKET\_REUSEADDR implies SO\_REUSEPORT in addition to SO\_REUSEADDR to be consistent with Windows. 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. {\bf wxSOCKET\_REUSEADDR} controls special platform-specific behavior for reusing local addresses/ports. % % SetLocal % \membersection{wxSocketBase::SetLocal}\label{wxsocketbasesetlocal} \func{bool}{SetLocal}{\param{wxIPV4address\&}{ local}} This function allows you to set the local address and port, useful when an application needs to reuse a particular port. When a local port is set for a \helpref{wxSocketClient}{wxsocketclient}, {\bf bind} will be called before {\bf connect}. % % 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 may be combination of flags ORed together. 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 timeout is 10 minutes. % % Peek % \membersection{wxSocketBase::Peek}\label{wxsocketbasepeek} \func{wxSocketBase\&}{Peek}{\param{void *}{ 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{void *}{ 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} % % ReadMsg % \membersection{wxSocketBase::ReadMsg}\label{wxsocketbasereadmsg} \func{wxSocketBase\&}{ReadMsg}{\param{void *}{ 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 void *}{ 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} % % Wait % \membersection{wxSocketBase::Wait}\label{wxsocketbasewait} \func{bool}{Wait}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until any of the following conditions is true: \begin{itemize} \item The socket becomes readable. \item The socket becomes writable. \item An ongoing connection request has completed (\helpref{wxSocketClient}{wxsocketclient} only) \item An incoming connection request has arrived (\helpref{wxSocketServer}{wxsocketserver} only) \item The connection has been closed. \end{itemize} Note that it is recommended to use the individual Wait functions to wait for the required condition, instead of this one. \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::InterruptWait}{wxsocketbaseinterruptwait}, \helpref{wxSocketServer::WaitForAccept}{wxsocketserverwaitforaccept}, \helpref{wxSocketBase::WaitForLost}{wxsocketbasewaitforlost}, \helpref{wxSocketBase::WaitForRead}{wxsocketbasewaitforread}, \helpref{wxSocketBase::WaitForWrite}{wxsocketbasewaitforwrite}, \helpref{wxSocketClient::WaitOnConnect}{wxsocketclientwaitonconnect} % % 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::InterruptWait}{wxsocketbaseinterruptwait}, \helpref{wxSocketBase::Wait}{wxsocketbasewait} % % WaitForRead % \membersection{wxSocketBase::WaitForRead}\label{wxsocketbasewaitforread} \func{bool}{WaitForRead}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until the socket is readable. This might mean that queued data is available for reading or, for streamed sockets, that the connection has been closed, so that a read operation will complete immediately without blocking (unless the {\bf wxSOCKET\_WAITALL} flag is set, in which case the operation might still block). \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 socket becomes readable, false on timeout. \wxheading{See also} \helpref{wxSocketBase::InterruptWait}{wxsocketbaseinterruptwait}, \helpref{wxSocketBase::Wait}{wxsocketbasewait} % % WaitForWrite % \membersection{wxSocketBase::WaitForWrite}\label{wxsocketbasewaitforwrite} \func{bool}{WaitForWrite}{\param{long}{ seconds = -1}, \param{long}{ millisecond = 0}} This function waits until the socket becomes writable. This might mean that the socket is ready to send new data, or for streamed sockets, that the connection has been closed, so that a write operation is guaranteed to complete immediately (unless the {\bf wxSOCKET\_WAITALL} flag is set, in which case the operation might still block). \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 socket becomes writable, false on timeout. \wxheading{See also} \helpref{wxSocketBase::InterruptWait}{wxsocketbaseinterruptwait}, \helpref{wxSocketBase::Wait}{wxsocketbasewait} % % Write % \membersection{wxSocketBase::Write}\label{wxsocketbasewrite} \func{wxSocketBase\&}{Write}{\param{const void *}{ 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 void *}{ 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} % --------------------------------------------------------------------------- % CLASS wxSocketClient % --------------------------------------------------------------------------- \section{\class{wxSocketClient}}\label{wxsocketclient} \wxheading{Derived from} \helpref{wxSocketBase}{wxsocketbase} \wxheading{Include files} \latexignore{\rtfignore{\wxheading{Members}}} % --------------------------------------------------------------------------- % Members % --------------------------------------------------------------------------- % % wxSocketClient % \membersection{wxSocketClient::wxSocketClient}\label{wxsocketclientctor} \func{}{wxSocketClient}{\param{wxSocketFlags}{ flags = wxSOCKET\_NONE}} Constructor. \wxheading{Parameters} \docparam{flags}{Socket flags (See \helpref{wxSocketBase::SetFlags}{wxsocketbasesetflags})} % % ~wxSocketClient % \membersection{wxSocketClient::\destruct{wxSocketClient}}\label{wxsocketclientdtor} \func{}{\destruct{wxSocketClient}}{\void} Destructor. Please see \helpref{wxSocketBase::Destroy}{wxsocketbasedestroy}. % % Connect % \membersection{wxSocketClient::Connect}\label{wxsocketclientconnect} \func{bool}{Connect}{\param{wxSockAddress\&}{ address}, \param{bool}{ wait = true}} \func{bool}{Connect}{\param{wxSockAddress\&}{ address}, \param{wxSockAddress\&}{ local}, \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{local}{Bind to the specified local address and port before connecting. The local address and port can also be set using \helpref{SetLocal}{wxsocketbasesetlocal}, and then using the 2-parameter Connect method.} \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 occurred 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} WaitOnConnect returns true if the connection request completes. This does not necessarily mean that the connection was successfully established; it might also happen that the connection was refused by the peer. Use \helpref{IsConnected}{wxsocketbaseisconnected} to distinguish between these two situations. If the timeout elapses, WaitOnConnect returns false. These semantics allow code like this: \begin{verbatim} // Issue the connection request client->Connect(addr, false); // Wait until the request completes or until we decide to give up bool waitmore = true; while ( !client->WaitOnConnect(seconds, millis) && waitmore ) { // possibly give some feedback to the user, // and update waitmore as needed. } bool success = client->IsConnected(); \end{verbatim} \wxheading{See also} \helpref{wxSocketClient::Connect}{wxsocketclientconnect}, \helpref{wxSocketBase::InterruptWait}{wxsocketbaseinterruptwait}, \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}\label{wxsocketeventctor} \func{}{wxSocketEvent}{\param{int}{ id = 0}} Constructor. \membersection{wxSocketEvent::GetClientData}\label{wxsocketeventgetclientdata} \func{void *}{GetClientData}{\void} Gets the client data of the socket which generated this event, as set with \helpref{wxSocketBase::SetClientData}{wxsocketbasesetclientdata}. \membersection{wxSocketEvent::GetSocket}\label{wxsocketeventgetsocket} \constfunc{wxSocketBase *}{GetSocket}{\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::GetSocketEvent}\label{wxsocketeventgetsocketevent} \constfunc{wxSocketNotify}{GetSocketEvent}{\void} Returns the socket event type.