詳解iPhone 下AsyncSocket網絡庫編程是本文要介紹的內容，iphone的標準推薦CFNetwork C庫編程.但是編程比較煩躁。在其它OS往往用類來封裝的對Socket函數的處理。比如MFC的CAsysncSocket.在iphone也有類似於開源項目.cocoa AsyncSocket庫
官方網站:https://code.google.com/p/cocoaasyncsocket/
這裡隻上例子，自己在項目中使用的，絕對能使用，如果有疑問，歡迎留言討論。
將AsyncUdpSocket.h AsyncUdpSocket.m 導入到你的工程中，
在自己建立的util中，加入一下代碼
[cpp]
01.<PRE class=cpp name="code">#pragma mark udp
02.-(void)sendSearchBroadcast{
03. NSString* bchost=@"255.255.255.255"; //這裡發送廣播
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]autorelease]; //得到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]; //設置超時10秒
11. [udpSocket enableBroadcast:YES error:nil]; //如果你發送廣播，這裡必須先enableBroadcast
12. NSData *data=[msg dataUsingEncoding:NSUTF8StringEncoding];
13. [udpSocket sendData:data toHost:address port:port withTimeout:10 tag:1]; //發送udp
14.}</PRE><PRE class=cpp name="code">//下面是發送的相關回調函數
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,試一下吧
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