iPhone socket 编程,该怎么处理

iPhone socket 编程
写了一个应用程序，但是不完善。请大侠们指点指点！ 我的客户端是写成iPhone应用程序，socket是用CFsocket来写的。服务器是在Windows下，用MFC来写的。遵循的是TCP协议。现在已经测试通过了！ 但有一个问题，就是当服务器断开之后，客户端并没有监听到服务器的断开，想问一下如何写个监听程序，当服务器断开时，客户端能及时退出，并返回重新连接的界面！ 谢谢先~

连接图和发送图：
http://www.cocoachina.com/bbs/read.php?tid-48722.html 


连接代码如下： 
- (void) doConnect { 
CFSocketContext CTX = {0, self, NULL, NULL, NULL}; 

//Create the socket of TCP 
_socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketConnectCallBack, TCPServerConnectCallBack, &CTX); 

//Create Error 
if (NULL == _socket) { 
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Create socket error" delegate:nil cancelButtonTitle:@"关闭" otherButtonTitles:nil]; 
[alert show]; 
[alert release]; 
} 

struct sockaddr_in Server_addr; 

memset(&Server_addr, 0, sizeof(Server_addr)); 

Server_addr.sin_len = sizeof(Server_addr); 
Server_addr.sin_family = AF_INET; 
Server_addr.sin_addr.s_addr = htonl(0xc0a800c8L); //Only 192.168.2.202 allowed 
Server_addr.sin_port = htons(70); //Only Port 70 allowed 
//Server_addr.sin_addr.s_addr = inet_addr([connController.textField.text UTF8String]); 

CFDataRef address = CFDataCreate(kCFAllocatorDefault, (UInt8 *)&Server_addr, sizeof(Server_addr)); 

//Connect the the server's socket 
CFSocketConnectToAddress(_socket, address, -1); 


CFRunLoopRef cfrl = CFRunLoopGetCurrent(); 
CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, _socket, 0); 
CFRunLoopAddSource(cfrl, source, kCFRunLoopCommonModes); 
CFRelease(source); 

CFRunLoopRun(); 

while (1) { 
struct timeval tv; 
tv.tv_usec = 0; 
tv.tv_sec = 1; 
select(-1, NULL, NULL, NULL, &tv); 
} 
} 

发送代码如下： 
- (void) sendMessage { 
NSString *stringToSend = [sendController.textField.text stringByAppendingString:@"\n"]; 
const char *data = [stringToSend UTF8String]; 
send(CFSocketGetNative(_socket), data, strlen(data) + 1, 0); 
NSRange endRange; 
endRange.location = [sendController.textView.text length]; 
endRange.length = [stringToSend length]; 
sendController.textView.text = [sendController.textView.text stringByAppendingString:[@"Client: " stringByAppendingString:stringToSend]]; 
[sendController.textView scrollRangeToVisible:endRange]; 
sendController.textField.text = @""; 
} 



------解决方案--------------------
问题解决了~