CAsysncSocket-udp tool-AsyncUdpSocket usage.

The programming of the AsyncSocket network library under the iPhone is described in this article. The CFNetwork C library programming is recommended for the iphone standard, but programming is quite annoying. In other operating systems, classes are often used to encapsulate Socket functions. For example, the CAsysncSocket of MFC also has a similar open-source project on the iphone. cocoa AsyncSocket Library

Http://code.google.com/p/cocoaasyncsocket/

Here we only use the example above. You can use it in your project. If you have any questions, please leave a message to discuss it.

Import AsyncUdpSocket. h AsyncUdpSocket. m to your project,

In your own util, add the code

[Cpp]
01. <PRE class = cpp name = "code"> # pragma mark udp
02.-(void) sendSearchBroadcast {
03. NSString * bchost = @ "broadcast 255"; // broadcast is sent here.
04. [self sendToUDPServer: @ "hello udp" address: bchost port: BCPORT];
05 .}
06.-(void) sendToUDPServer :( NSString *) msg address :( NSString *) address port :( int) port {
07. AsyncUdpSocket * udpSocket = [[AsyncUdpSocket alloc] initWithDelegate: self] autorelbid]; // obtain udp util
08. NSLog (@ "address: % @, port: % d, msg: % @", address, port, msg );
09. // receiveWithTimeout is necessary or you won't receive anything
10. [udpSocket receiveWithTimeout: 10 tag: 2]; // set timeout to 10 seconds.
11. [udpSocket enableBroadcast: YES error: nil]; // if you send a broadcast, enableBroadcast must be enabled first.
12. NSData * data = [msg dataUsingEncoding: NSUTF8StringEncoding];
13. [udpSocket sendData: data toHost: address port: port withTimeout: 10 tag: 1]; // send udp
14.} </PRE> <PRE class = cpp name = "code"> // The following are the sent callback functions.
15.-(BOOL) onUdpSocket :( AsyncUdpSocket *) sock didReceiveData :( NSData *) data withTag :( long) tag fromHost :( NSString *) host port :( UInt16) port {
16. NSString * rData = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]
17. autorelease];
18. NSLog (@ "onUdpSocket: didReceiveData: --- % @", rData );
19. return YES;
20 .}
21.-(void) onUdpSocket :( AsyncUdpSocket *) sock didNotSendDataWithTag :( long) tag dueToError :( NSError *) error {
22. NSLog (@ "didNotSendDataWithTag ----");
23.
24 .}
25.-(void) onUdpSocket :( AsyncUdpSocket *) sock didNotReceiveDataWithTag :( long) tag dueToError :( NSError *) error {
26. NSLog (@ "didNotReceiveDataWithTag ----");
27 .}
28.-(void) onUdpSocket :( AsyncUdpSocket *) sock didSendDataWithTag :( long) tag {
29. NSLog (@ "didSendDataWithTag ----");
30 .}
31.-(void) onUdpSocketDidClose :( AsyncUdpSocket *) sock {
32. NSLog (@ "onUdpSocketDidClose ----");
33. }</PRE> <BR>
34. <PRE> </PRE>
35. OK. Give it a try.
36. <P> </P>
37. <P> </P>
38. <PRE> </PRE>
39. <PRE> </PRE>