详解iPhone 下AsyncSocket网络库编程是本文要介绍的内容，iphone的标准推荐CFNetwork C库编程.但是编程比较烦躁。在其它OS往往用类来封装的对Socket函数的处理。比如MFC的CAsysncSocket.在iphone也有类似于开源项目.cocoa AsyncSocket库
官方网站:http://code.google.com/p/cocoaasyncsocket/
这里只上例子，自己在项目中使用的，绝对能使用，如果有疑问，欢迎留言讨论。
将AsyncUdpSocket.h AsyncUdpSocket.m 导入到你的工程中，
在自己建立的util中，加入一下代码
- <pre name="code" class="cpp">#pragma mark udp
- -(void)sendSearchBroadcast{
- NSString* bchost=@"255.255.255.255"; //这里发送广播
- [self sendToUDPServer:@"hello udp" address:bchost port:BCPORT];
- }
- -(void)sendToUDPServer:(NSString*) msg address:(NSString*)address port:(int)port{
- AsyncUdpSocket *udpSocket=[[[AsyncUdpSocket alloc]initWithDelegate:self]autorelease]; //得到udp util
- NSLog(@"address:%@,port:%d,msg:%@",address,port,msg);
- //receiveWithTimeout is necessary or you won't receive anything
- [udpSocket receiveWithTimeout:10 tag:2]; //设置超时10秒
- [udpSocket enableBroadcast:YES error:nil]; //如果你发送广播，这里必须先enableBroadcast
- NSData *data=[msg dataUsingEncoding:NSUTF8StringEncoding];
- [udpSocket sendData:data toHost:address port:port withTimeout:10 tag:1]; //发送udp
- }</pre><pre name="code" class="cpp">//下面是发送的相关回调函数
- -(BOOL)onUdpSocket:(AsyncUdpSocket *)sock didReceiveData:(NSData *)data withTag:(long)tag fromHost:(NSString *)host port:(UInt16)port{
- NSString* rData= [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]
- autorelease];
- NSLog(@"onUdpSocket:didReceiveData:---%@",rData);
- return YES;
- }
- -(void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error{
- NSLog(@"didNotSendDataWithTag----");
- }
- -(void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error{
- NSLog(@"didNotReceiveDataWithTag----");
- }
- -(void)onUdpSocket:(AsyncUdpSocket *)sock didSendDataWithTag:(long)tag{
- NSLog(@"didSendDataWithTag----");
- }
- -(void)onUdpSocketDidClose:(AsyncUdpSocket *)sock{
- NSLog(@"onUdpSocketDidClose----");
- }</pre><br><pre></pre>ok,试一下吧<p></p><p></p><pre></pre><pre></pre>
转：http://blog.csdn.net/kafeidev/article/details/8465970