IOS的网络通信的方法

ios设备的网络通信的方法，有如下两个大类：1、使用socket的方式进行通信。2、使用asynsocket类库进行通信。两种方法当中，我觉得asynsocket更好，因为是别人已经封装好的类库，比较稳定。但是对于直接使用socket的通信方法我倒是觉得很灵活。因为控制都是自己在做的事情。先列举集中不同的使用方法：1、直接使用socket的方式。以 TCP为利，对于TCP来说，是要区分服务端和客户端的。服务端：通常的方法是服务端启动后监听，是否有客户端连接，如果有连接，则建立与客户端的通信。客户端的方法通常是连接服务端，当连接成功之后，就希望发送数据了。客户端：CFSocketContext sockContext ;CFSocketRef cfsock ;sockContext.info =self;sockContext.copyDescription =0;cfsock =CFSocketCreate(kCFAllocatorDefault,PF_INET,SOCK_STREAM,IPPROTO_TCP,kCFSocketConnectCallBack,MyCallBack,&sockContext);// 这个地方是个关键的地方，就是建立一个ip地址，然后使的客户端可以向服务端发起连接。NSString *strAddress =@"192.168.1.1";if (cfsock !=nil) {struct sockaddr_in addr4;memset(&addr4,0,sizeof(addr4));addr4.sin_len =sizeof(addr4);addr4.sin_family =AF_INET;addr4.sin_port =htons(1230);addr4.sin_addr.s_addr =inet_addr( [strAddress UTF8String] );CFDataRef address =CFDataCreate(kCFAllocatorDefault, (UInt8*)&addr4,sizeof(addr4));CFSocketConnectToAddress(cfsock, address, -1);}// 发起连接之后，需要将runloop的过程，也就是消息的过程加入到当前线程当中。这样当有事件发生时，会调用对应的方法。CFRunLoopRef crun =CFRunLoopGetCurrent();//CFRunLoopGetMain();CFRunLoopSourceRef source =CFSocketCreateRunLoopSource(kCFAllocatorDefault,cfsock, 0);CFRunLoopAddSource(crun, source,kCFRunLoopCommonModes);CFRelease(source);回调函数：当连接成功之后的处理如下：static void MyCallBack (CFSocketRef s,CFSocketCallBackType callbackType,CFDataRef address,constvoid *data,void *info){if (data!=NULL) {NSLog(@"传输失败!");}SocketTestAppDelegate *client = (SocketTestAppDelegate*)info;[client performSelectoInBackground:@selector(readstream)withObject:nil];}-(void) readstream{char buffer[1024];NSAutoreleasePool *pool = [[NSAutoreleasePoolalloc] init];while (recv(CFSocketGetNative(cfsock),buffer,sizeof(buffer),0)) {}[pool release];}// 如果希望直接向服务器写内容的话，采用如下的方法。-(void) sendstream{NSString * stringtosend =@"hello everyone";const char *data = [stringtosendUTF8String];send(CFSocketGetNative(cfsock),data,strlen(data)+1,0);}服务器端的程序：CFSocketRef socketserver;int setupSocket(){socketserver =CFSocketCreate(kCFAllocatorDefault,PF_INET,SOCK_STREAM,IPPROTO_TCP,kCFSocketAcceptCallBack,myaccept,NULL);int optval =1;setsockopt(CFSocketGetNative(socketserver),SOL_SOCKET, SO_REUSEADDR, (void*)&optval,sizeof(optval));struct sockaddr_in addr4;memset(&addr4,0,sizeof(addr4));addr4.sin_len =sizeof(addr4);addr4.sin_family =AF_INET;addr4.sin_port =htons(10);addr4.sin_addr.s_addr=htonl(INADDR_ANY);CFDataRef address =CFDataCreate(kCFAllocatorDefault, (UInt8*)&addr4,sizeof(addr4));CFSocketSetAddress(socketserver, address);CFRunLoopRef cfRunloop =CFRunLoopGetCurrent();CFRunLoopSourceRef source =CFSocketCreateRunLoopSource(kCFAllocatorDefault,socketserver, 0);CFRunLoopAddSource(cfRunloop, source,kCFRunLoopCommonModes);CFRelease(source);}//服务端的socket建立之后，就需要接受client的连接，因此建立连接的回调函数。static void myaccept (CFSocketRef s,CFSocketCallBackType callbackType,CFDataRef address,constvoid *data,void *info){if (callbackType ==kCFSocketAcceptCallBack) {// 如果对端连接成功的话，是可以获取对端的名称和socket的。CFSocketNativeHandle nativesockethandle = *(CFSocketNativeHandle*)data;uint8_t name[100];socklen_t namelen =100;getpeername(nativesockethandle, (struct sockaddr *)name, &namelen);//除此以外，更重要的是获取输入流 和 输出流，CFReadStreamRef iStream;CFWriteStreamRef oStream;//创建一个可读写的socket连接CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativesockethandle, &iStream, &oStream);CFStreamClientContextstreamcontext={0,NULL,NULL,NULL};// 注册两种事件！CFReadStreamSetClient(iStream,kCFStreamEventHasBytesAvailable, readStream, &streamcontext);CFReadStreamSetClient(iStream,kCFStreamEventCanAcceptBytes, writeStream, &streamcontext);//加入到循环当中！CFReadStreamScheduleWithRunLoop(iStream,CFRunLoopGetCurrent(),kCFRunLoopCommonModes);CFWriteStreamScheduleWithRunLoop(oStream,CFRunLoopGetCurrent(),kCFRunLoopCommonModes);CFReadStreamOpen(iStream);CFWriteStreamOpen(oStream);}}void readStream(CFReadStreamRef stream,CFStreamEventType eventType,void *clientCallBackInfo) {UInt8 buff[255];CFReadStreamRead(stream, buff,255);printf("received: %s", buff);}void writeStream (CFWriteStreamRef stream,CFStreamEventType eventType, void *clientCallBackInfo) {// outputStream = stream;

char *str = "nihao";

CFWriteStreamWrite(outputStream, str, strlen(line) + 1);

}另一种方法是使用NSStream的方式构建客户端，然后发送和接受内容。