Updated some bits in socket docs.

Documented socket samples
Moved wxInitAllImageHandlers from 'file functions' (?) to 'misc functions'


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5643 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/tsamples.tex

@@ -239,6 +239,61 @@ specifying the foreground and background colours with
 bitmap is then converted to a wxImage and the foreground colour (black) is
 replaced with red using \helpref{wxImage::Replace}{wximagereplace}.
 
+\subsection{Sockets sample}\label{samplesockets}
+
+The sockets sample demonstrates how to use the communication facilities
+provided by \helpref{wxSocket}{wxsocketbase}. There are two different
+applications in this sample: a server, which is implemented as a
+\helpref{wxSocketServer}{wxsocketserver} object, and a client, which is
+implemented with \helpref{wxSocketClient}{wxsocketclient}.
+
+The server binds to the local address, using TCP port number 3000, sets
+up an event handler to be notified of incoming connection requests
+({\bf wxSOCKET\_CONNECTION} event), and stands there, waiting (listening
+in the socket parlance) for clients. For each incoming client, a new
+\helpref{wxSocketBase}{wxsocketbase} object is created, which represents
+the connection. Connections are independent from the server that created
+them, so they set up their own event handler, and stay awaiting for
+{\bf wxSOCKET\_INPUT} (incoming data) or {\bf wxSOCKET\_LOST} (connection
+closed at the remote end) events. This event handler is the same for all
+connections, and demonstrates how to determine which socket the event
+is addressed to by using the \helpref{Socket}{wxsocketeventsocket} function
+in the \helpref{wxSocketEvent}{wxsocketevent} class.
+
+Although it might take some time to get used to the event-oriented
+system upon which wxSocket is built, the benefits are many. See, for
+example, that the server application, while being single-threaded
+(and of course without using fork() or ugly select() loops) can handle
+an arbitrary number of connections.
+
+The client starts up unconnected, so you can use the Connect... option
+to specify the address of the server you are going to connect to (the
+TCP port number is hard-coded as 3000). Once connected, a number of
+tests are possible. Currently, three tests are implemented. They show
+how to use the basic IO calls in \helpref{wxSocketBase}{wxsocketbase},
+such as \helpref{Read}{wxsocketbaseread}, \helpref{Write}{wxsocketbasewrite},
+\helpref{ReadMsg}{wxsocketbasereadmsg} and \helpref{WriteMsg}{wxsocketbasewritemsg},
+and how to set up the correct IO flags depending on what you are going to
+do. See the comments in the code for more information (a lengthy explanation
+on socket flags is available in \helpref{SetFlags}{wxsocketbasesetflags}).
+Note that because both clients and connection objects in the server set
+up an event handler to catch {\bf wxSOCKET\_LOST} events, each one is
+immediately notified if the other end closes the connection.
+
+The sockets sample is work in progress. Coming soon:
+
+\begin{itemize}
+
+\item More tests for basic socket functionality.
+
+\item Tests for the recently added datagram socket classes.
+
+\item Tests for protocol classes (wxProtocol and its descendants).
+
+\item New samples which actually do something useful (suggestions accepted).
+
+\end{itemize}
+
 \subsection{Text sample}\label{sampletext}
 
 This sample demonstrates four features: firstly the use and many variants of