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<HTML>
<head><title>wxSocketBase</title></head>
<BODY BGCOLOR=#FFFFFF>
<A NAME="wxsocketbase"></A><CENTER>
<A HREF="wx.htm"><img align=center src="contents.gif" BORDER=0 ALT="Contents"></A> <A HREF="wx22.htm#classref"><img align=center src="up.gif" BORDER=0 ALT="Up"></A> <A HREF="wx208.htm#wxsockaddress"><img align=center src="back.gif" BORDER=0 ALT="Previous"></A> <A HREF="wx210.htm#wxsocketclient"><img align=center src="forward.gif" BORDER=0 ALT="Next"></A> </CENTER><HR>
<H2>wxSocketBase</H2>
<P>
<B><FONT COLOR="#FF0000">Derived from</FONT></B><P>
<A HREF="wx85.htm#wxevthandler">wxEvtHandler</A><P>
<B><FONT COLOR="#FF0000">Include files</FONT></B><P>
<wx/socket.h><P>
<B><FONT COLOR="#FF0000">Event handling</FONT></B><P>
To process events from a socket, use the following event handler macro to direct
input to member
functions that take a <A HREF="wx211.htm#wxsocketevent">wxSocketEvent</A> argument.<P>
<TABLE>
<TR><TD VALIGN=TOP>
<B>EVT_SOCKET(id, func)</B>
</TD>
<TD VALIGN=TOP>
A socket event occured.
</TD></TR>
</TABLE>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx211.htm#wxsocketevent">wxSocketEvent</A><BR>
<A HREF="wx210.htm#wxsocketclient">wxSocketClient</A><BR>
<A HREF="wx213.htm#wxsocketserver">wxSocketServer</A><P>
<B><FONT COLOR="#FF0000">Members</FONT></B><P>
<A HREF="#topic825">wxSocketBase::wxSocketBase</A><BR>
<A HREF="#topic826">wxSocketBase::~wxSocketBase</A><BR>
<A HREF="#wxsocketbaseok">wxSocketBase::Ok</A><BR>
<A HREF="#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="#wxsocketbaseconnected">wxSocketBase::IsConnected</A><BR>
<A HREF="#wxsocketbaseisdata">wxSocketBase::IsData</A><BR>
<A HREF="#wxsocketbasedisconnected">wxSocketBase::IsDisconnected</A><BR>
<A HREF="#wxsocketbasenowait">wxSocketBase::IsNoWait</A><BR>
<A HREF="#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="#wxsocketbaselasterror">wxSocketBase::LastError</A><BR>
<A HREF="#wxsocketbasepeek">wxSocketBase::Peek</A><BR>
<A HREF="#wxsocketbaseread">wxSocketBase::Read</A><BR>
<A HREF="#wxsocketbasesetflags">wxSocketBase::SetFlags</A><BR>
<A HREF="#wxsocketbasewrite">wxSocketBase::Write</A><BR>
<A HREF="#wxsocketbasewritemsg">wxSocketBase::WriteMsg</A><BR>
<A HREF="#wxsocketbasereadmsg">wxSocketBase::ReadMsg</A><BR>
<A HREF="#wxsocketbaseunread">wxSocketBase::UnRead</A><BR>
<A HREF="#wxsocketbasediscard">wxSocketBase::Discard</A><BR>
<A HREF="#wxsocketbasewait">wxSocketBase::Wait</A><BR>
<A HREF="#wxsocketbasewaitforread">wxSocketBase::WaitForRead</A><BR>
<A HREF="#wxsocketbasewaitforwrite">wxSocketBase::WaitForWrite</A><BR>
<A HREF="#wxsocketbasewaitforlost">wxSocketBase::WaitForLost</A><BR>
<A HREF="#wxsocketbaserestorestate">wxSocketBase::RestoreState</A><BR>
<A HREF="#wxsocketbasesavestate">wxSocketBase::SaveState</A><BR>
<A HREF="#wxsocketbaseseteventhandler">wxSocketBase::SetEventHandler</A><BR>
<P>
<HR>
<A NAME="topic825"></A>
<H3>wxSocketBase::wxSocketBase</H3>
<P>
<B></B> <B>wxSocketBase</B>()<P>
Default constructor but don't use it, you must use <A HREF="wx210.htm#wxsocketclient">wxSocketClient</A>
or <A HREF="wx213.htm#wxsocketserver">wxSocketServer</A>.<P>
<HR>
<A NAME="topic826"></A>
<H3>wxSocketBase::~wxSocketBase</H3>
<P>
<B></B> <B>~wxSocketBase</B>()<P>
Destroys the wxSocketBase object.<P>
<HR>
<A NAME="wxsocketbaseok"></A>
<H3>wxSocketBase::Ok</H3>
<P>
<B>bool</B> <B>Ok</B>() <B>const</B><P>
Returns TRUE if the socket is initialized and ready and FALSE in other
cases.<P>
<HR>
<A NAME="wxsocketbaseerror"></A>
<H3>wxSocketBase::Error</H3>
<P>
<B>bool</B> <B>Error</B>() <B>const</B><P>
Returns TRUE if an error occured.<P>
<HR>
<A NAME="wxsocketbaseconnected"></A>
<H3>wxSocketBase::IsConnected</H3>
<P>
<B>bool</B> <B>IsConnected</B>() <B>const</B><P>
Returns TRUE if the socket is connected.<P>
<HR>
<A NAME="wxsocketbaseisdata"></A>
<H3>wxSocketBase::IsData</H3>
<P>
<B>bool</B> <B>IsData</B>() <B>const</B><P>
Returns TRUE if some data is arrived on the socket. <P>
<HR>
<A NAME="wxsocketbasedisconnected"></A>
<H3>wxSocketBase::IsDisconnected</H3>
<P>
<B>bool</B> <B>IsDisconnected</B>() <B>const</B><P>
Returns TRUE if the socket is disconnected.<P>
<HR>
<A NAME="wxsocketbasenowait"></A>
<H3>wxSocketBase::IsNoWait</H3>
<P>
<B>bool</B> <B>IsNoWait</B>() <B>const</B><P>
Returns TRUE if the socket mustn't wait.<P>
<HR>
<A NAME="wxsocketbaselastcount"></A>
<H3>wxSocketBase::LastCount</H3>
<P>
<B>size_t</B> <B>LastCount</B>() <B>const</B><P>
Returns the number of bytes read or written by the last IO call.<P>
<HR>
<A NAME="wxsocketbaselasterror"></A>
<H3>wxSocketBase::LastError</H3>
<P>
<B>int</B> <B>LastError</B>() <B>const</B><P>
Returns an error in the errno format (see your C programmer's guide).<P>
<HR>
<A NAME="wxsocketbasepeek"></A>
<H3>wxSocketBase::Peek</H3>
<P>
<B>wxSocketBase&</B> <B>Peek</B>(<B>char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function peeks a buffer of <I>nbytes</I> bytes from the socket. Peeking a buffer
doesn't delete it from the system socket in-queue.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer where to put peeked data.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A><P>
<HR>
<A NAME="wxsocketbaseread"></A>
<H3>wxSocketBase::Read</H3>
<P>
<B>wxSocketBase&</B> <B>Read</B>(<B>char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function reads a buffer of <I>nbytes</I> bytes from the socket.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer where to put read data.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">Remark/Warning</FONT></B><P>
By default, Read uses an internal asynchronous manager: it will send data when
the socket requests them. It is particularly interesting when you enter a long
data transfer (e.g. a big file, an image, ...). But it is also buggy when you
simply discuss with the peer using user data. In this case, wxSocket prepares
itself to send data (Write wait for them to be sent) and during a GUI refresh
the user enters new data, which involves a new Read call though the previous
isn't finished. Well, in most cases it can work but it might fail too.
So I advise you to use the SPEED flag, which disables the asynchronous manager,
when you just want to discuss with the peer.<P>
This remark is also valid for all IO call.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A>,
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A>,
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A>
<HR>
<A NAME="wxsocketbasesetflags"></A>
<H3>wxSocketBase::SetFlags</H3>
<P>
<B>void</B> <B>SetFlags</B>(<B>wxSockFlags</B><I> flags</I>)<P>
<TABLE>
<TR><TD VALIGN=TOP>
<B>wxSocketBase::NONE</B>
</TD>
<TD VALIGN=TOP>
Normal functionnalities.
</TD></TR>
<TR><TD VALIGN=TOP>
<B>wxSocketBase::NOWAIT</B>
</TD>
<TD VALIGN=TOP>
Get the available data in the input queue and exit immediately.
</TD></TR>
<TR><TD VALIGN=TOP>
<B>wxSocketBase::WAITALL</B>
</TD>
<TD VALIGN=TOP>
Wait for all required data unless an error occured.
</TD></TR>
<TR><TD VALIGN=TOP>
<B>wxSocketBase::SPEED</B>
</TD>
<TD VALIGN=TOP>
Disable the asynchronous IO functionnality.
</TD></TR>
</TABLE>
<P>
<HR>
<A NAME="wxsocketbasewrite"></A>
<H3>wxSocketBase::Write</H3>
<P>
<B>wxSocketBase&</B> <B>Write</B>(<B>const char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function writes a buffer of <I>nbytes</I> bytes from the socket.<P>
<B><FONT COLOR="#FF0000">Remark/Warning</FONT></B><P>
By default, Write uses an internal asynchronous manager: it will send data when
the socket requests them. It is particularly interesting when you enter a long
data transfer (e.g. a big file, an image, ...). But it is also buggy when you
simply discuss with the peer using user data. In this case, wxSocket prepares
itself to send data (Write wait for them to be sent) and during a GUI refresh
the user enters new data, which involves a new Write call though the previous
isn't finished. Well, in most cases it can work but it might fail too.
So I advise you to use the SPEED flag, which disables the asynchronous manager,
when you just want to discuss with the peer.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer where to get the data to write.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A><P>
<HR>
<A NAME="wxsocketbasewritemsg"></A>
<H3>wxSocketBase::WriteMsg</H3>
<P>
<B>wxSocketBase&</B> <B>WriteMsg</B>(<B>const char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function writes a buffer of <I>nbytes</I> bytes from the socket. But it
writes a short header before so that ReadMsg can alloc the right size for
the buffer. So a buffer sent with WriteMsg <B>must</B> be read with ReadMsg.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer where to put data peeked.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A><BR>
<A HREF="wx209.htm#wxsocketbasereadmsg">wxSocketBase::ReadMsg</A><P>
<HR>
<A NAME="wxsocketbasereadmsg"></A>
<H3>wxSocketBase::ReadMsg</H3>
<P>
<B>wxSocketBase&</B> <B>ReadMsg</B>(<B>char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function reads a buffer sent by WriteMsg on a socket. If the buffer passed
to the function isn't big enough, the function filled it and then discard the
bytes left. This function always wait for the buffer to be entirely filled.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer where to put read data.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes allocated for the buffer.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A><BR>
<A HREF="wx209.htm#wxsocketbasewritemsg">wxSocketBase::WriteMsg</A><P>
<HR>
<A NAME="wxsocketbaseunread"></A>
<H3>wxSocketBase::UnRead</H3>
<P>
<B>wxSocketBase&</B> <B>UnRead</B>(<B>const char *</B><I> buffer</I>, <B>size_t</B><I> nbytes</I>)<P>
This function unreads a buffer. It means that the buffer is put in the top
of the incoming queue. But, it is put also at the end of all unread buffers.
It is useful for sockets because we can't seek it.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>buffer</I><UL><UL>
Buffer to be unread.</UL></UL>
<P>
<I>nbytes</I><UL><UL>
Number of bytes.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns a reference to the current object.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaseerror">wxSocketBase::Error</A><BR>
<A HREF="wx209.htm#wxsocketbaselastcount">wxSocketBase::LastCount</A><BR>
<A HREF="wx209.htm#wxsocketbaselasterror">wxSocketBase::LastError</A><P>
<HR>
<A NAME="wxsocketbasediscard"></A>
<H3>wxSocketBase::Discard</H3>
<P>
<B>wxSocketBase&</B> <B>Discard</B>()<P>
This function simply deletes all bytes in the incoming queue. This function
doesn't wait.<P>
<HR>
<A NAME="wxsocketbasewait"></A>
<H3>wxSocketBase::Wait</H3>
<P>
<B>bool</B> <B>Wait</B>(<B>long</B><I> seconds = -1</I>, <B>long</B><I> microsecond = 0</I>)<P>
This function waits for an event: it could be an incoming byte, the possibility
for the client to write, a lost connection, an incoming connection, an
established connection.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>seconds</I><UL><UL>
Number of seconds to wait. By default, it waits infinitely.</UL></UL>
<P>
<I>microsecond</I><UL><UL>
Number of microseconds to wait.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns TRUE if an event occured, FALSE if the timeout was reached.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbasewaitforread">wxSocketBase::WaitForRead</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforwrite">wxSocketBase::WaitForWrite</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforlost">wxSocketBase::WaitForLost</A><P>
<HR>
<A NAME="wxsocketbasewaitforread"></A>
<H3>wxSocketBase::WaitForRead</H3>
<P>
<B>bool</B> <B>WaitForRead</B>(<B>long</B><I> seconds = -1</I>, <B>long</B><I> microsecond = 0</I>)<P>
This function waits for a read event.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>seconds</I><UL><UL>
Number of seconds to wait. By default, it waits infinitely.</UL></UL>
<P>
<I>microsecond</I><UL><UL>
Number of microseconds to wait.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns TRUE if a byte arrived, FALSE if the timeout was reached.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbasewait">wxSocketBase::Wait</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforwrite">wxSocketBase::WaitForWrite</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforlost">wxSocketBase::WaitForLost</A><P>
<HR>
<A NAME="wxsocketbasewaitforwrite"></A>
<H3>wxSocketBase::WaitForWrite</H3>
<P>
<B>bool</B> <B>WaitForWrite</B>(<B>long</B><I> seconds = -1</I>, <B>long</B><I> microsecond = 0</I>)<P>
This function waits for a write event.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>seconds</I><UL><UL>
Number of seconds to wait. By default, it waits infinitely.</UL></UL>
<P>
<I>microsecond</I><UL><UL>
Number of microseconds to wait.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns TRUE if a write event occured, FALSE if the timeout was reached.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbasewait">wxSocketBase::Wait</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforread">wxSocketBase::WaitForRead</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforlost">wxSocketBase::WaitForLost</A><P>
<HR>
<A NAME="wxsocketbasewaitforlost"></A>
<H3>wxSocketBase::WaitForLost</H3>
<P>
<B>bool</B> <B>Wait</B>(<B>long</B><I> seconds = -1</I>, <B>long</B><I> microsecond = 0</I>)<P>
This function waits for a "lost" event. For instance, the peer may have closed
the connection, or the connection may have been broken.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>seconds</I><UL><UL>
Number of seconds to wait. By default, it waits infinitely.</UL></UL>
<P>
<I>microsecond</I><UL><UL>
Number of microseconds to wait.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">Return value</FONT></B><P>
Returns TRUE if a "lost" event occured, FALSE if the timeout was reached.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbasewaitforread">wxSocketBase::WaitForRead</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforwrite">wxSocketBase::WaitForWrite</A><BR>
<A HREF="wx209.htm#wxsocketbasewaitforlost">wxSocketBase::WaitForLost</A><P>
<HR>
<A NAME="wxsocketbaserestorestate"></A>
<H3>wxSocketBase::RestoreState</H3>
<P>
<B>void</B> <B>RestoreState</B>()<P>
This function restores a previously saved state.<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbasesavestate">wxSocketBase::SaveState</A><P>
<HR>
<A NAME="wxsocketbasesavestate"></A>
<H3>wxSocketBase::SaveState</H3>
<P>
<B>void</B> <B>SaveState</B>()<P>
This function saves the current state of the socket object in a stack:
actually it saves all flags and the state of the asynchronous callbacks. <P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx209.htm#wxsocketbaserestorestate">wxSocketBase::RestoreState</A><P>
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<A NAME="wxsocketbaseseteventhandler"></A>
<H3>wxSocketBase::SetEventHandler</H3>
<P>
<B>void</B> <B>SetEventHandler</B>(<B>wxEvtHandler&</B><I> evt_hdlr</I>, <B>int</B><I> id = -1</I>)<P>
Sets an event handler to be called when a socket event occured.<P>
<B><FONT COLOR="#FF0000">Parameters</FONT></B><P>
<I>evt_hdlr</I><UL><UL>
Specifies the event handler you want to use.</UL></UL>
<P>
<I>id</I><UL><UL>
The id of socket event.</UL></UL>
<P>
<B><FONT COLOR="#FF0000">See also</FONT></B><P>
<A HREF="wx211.htm#wxsocketevent">wxSocketEvent</A><P>
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