Flex and. NET Interop (i): socket-based network connectivity

Flash/flex also supports socket-based network connections, and the server can be developed in any language such as C++,vb,c#,java. Listening to a network port can receive connections from clients that are Flash/flex developed.

ActionScript 3.0 provides a way to communicate with the server side through a socket connection. This is an important feature beyond the traditional B/s structure. This makes the network communication can be connected instantly, avoiding the disadvantage of the HTTP protocol stateless connection. ActionScript 3.0 uses the Xmlsocket class to connect. It is important to note that when you use the Xmlsocket class for a socket connection, you cannot automatically pass through the firewall. To go through a firewall connection, you need to use the HTTP protocol-based RTMP protocol.

By reviewing the API documentation provided by Adobe, Xmlsocket provides four public methods:

1, XMLSocket (host:string=null,port:int=0)--Create a new XMLSocket object.

2, Close (): void--close a xmlsocket.

3. Connect (host:string,port:int): void--connect to the specified TCP port.

4. Send (object:*): void--sends data to the connection server.

OK, so we can use xmlsocket to develop a socket-based network for instant communication applications. The following provides a socket service side via C # and listens on port 8888. The sample program is as follows:

<!--<br/><br/>code highlighting produced by Actipro Codehighlighter (freeware) <br/>http://www. Codehighlighter.com/<br/><br/>-->1usingsystem;
2usingsystem.collections.generic;
3usingsystem.linq;
4usingsystem.text;
5usingsystem.net.sockets;
6usingsystem.io;
7
8namespaceFlashFlexDotNet
9{
10classProgram
11{
12staticvoidMain (String[]args)
13{
14TcpListenerlistener;
15
16try
17{
18listener=newtcplistener (8888);
19}
20catch (Exceptionex)
21{
22console.writeline (ex. Message);
23return;
24}
25
26listener. Start ();
27console.writeline ("Server starts, waits for client connection.");
28boolloop=true;
29
30while (Loop)
31{
32sockets=listener. AcceptSocket ();
33networkstreamns=newnetworkstream (s);
34streamreaderreader=newstreamreader (NS);
35stringresult=string. Empty;
36try
37{
38result=reader. ReadLine ();
39console.writeline (result);
40}
41catch (Exceptionex)
42{
43console.writeline (ex. Message);
44}
45}
46}
47}
48}
49

The server-side socket is ready, and below is a look at how the client's ActionScript Xmlsocket to establish a socket connection to communicate with the. NET Socket service.

As described earlier in this article, ActionScript 3.0 provides a socket-based network connection class Xmlsocket, which we can use directly to develop socket-based network communication. Create a base with the Xmlsocket network connection provided by ActionScript 3.0 as follows:

<!--<br/><br/>code highlighting produced by Actipro Codehighlighter (freeware) <br/>http://www. Codehighlighter.com/<br/><br/>-->1privatefunctionconnectionserver (): void
2{
3xmlconn=newxmlsocket ();
4xmlconn.connect ("127.0.0.1", 8888);
5}

You can then send a message to the socket server via the Xmlsocket instance method send (). The following code defines:

<!--<br/><br/>code highlighting produced by Actipro Codehighlighter (freeware) <br/>http://www. Codehighlighter.com/<br/><br/>-->1privatefunctiononsend (): void
2{
3xmlconn.send (txtdata.text+ "\ n");
4}

Client complete code:

<!--<br/><br/>code highlighting produced by Actipro Codehighlighter (freeware) <br/>http://www. codehighlighter.com/<br/><br/>-->1<?xmlversion= "1.0" encoding= "Utf-8"?>
2<mx:applicationxmlns:mx= "Http://www.adobe.com/2006/mxml" layout= "Absolute"
3backgroundgradientalphas= "[1.0,1.0]"
4backgroundgradientcolors= "[#CDCAE6, #FFFFFF]" >
5<mx:script>
6<! [cdata[
7importmx.controls.alert;
8
9privatevarxmlconn:xmlsocket;
10
11privatefunctionconnectionServer (): void
12{
13xmlconn=newxmlsocket ();
14xmlconn.connect ("127.0.0.1", 8888);
15}
16
17privatefunctiononSend (): void
18{
19xmlconn.send (txtdata.text+ "\ n");
20}
21]]>
22</mx:script>
23<mx:textareax= "y=" "height=" width= "263" id= "Txtdata"/>
24<mx:buttonx= "y=" "label=" Connection "fontsize=" "click=" Connectionserver () "/>"
25<mx:buttonx= "y=" "label=" Send "fontsize=" "click=" OnSend () "/>"
26</mx:application>

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