How to create a TCP Server on the iPhone?

Question

I want to create a TCP server on the iPhone. I tried to write this server using Apple's developer help, but I had no success. I tried to listen with CoreFoundation and with POSIX Socket API but none of these worked.

Using CoreFoundation I implemented the following:

CFSocketRef myipv4cfsock = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketAcceptCallBack, handleConnect, NULL); struct sockaddr_in mySocket; memset(&mySocket, 0, sizeof(sin)); mySocket.sin_len = sizeof(sin); mySocket.sin_family = PF_INET; mySocket.sin_port = 8000; mySocket.sin_addr.s_addr= INADDR_ANY; CFSocketSetAddress(myipv4cfsock, CFDataCreate(kCFAllocatorDefault, (UInt8 *)&mySocket, sizeof(mySocket))); CFRunLoopSourceRef socketsource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, myipv4cfsock, 0); CFRunLoopAddSource(CFRunLoopGetCurrent(), socketsource, kCFRunLoopDefaultMode); CFReadStreamRef readStream; CFWriteStreamRef writeStream; CFStringRef remoteHost = CFSTR("localhost"); CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)remoteHost, 8000, &readStream, &writeStream); NSInputStream *inputStream = (__bridge_transfer NSInputStream *)readStream; NSOutputStream *outputStream = (__bridge_transfer NSOutputStream *)writeStream; [inputStream setDelegate: self]; [outputStream setDelegate: self]; [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [inputStream open]; [outputStream open];

Using the POSIX Socket API I implemented this:

int listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); struct sockaddr_in socketAddr; memset(&socketAddr, 0, sizeof(socketAddr)); socketAddr.sin_len = sizeof(sin); socketAddr.sin_family = AF_INET; socketAddr.sin_port = 8000; socketAddr.sin_addr.s_addr= INADDR_ANY; if (bind(listenSocket, (struct sockaddr *)&socketAddr, sizeof(socketAddr)) < 0) { NSLog(@"Error: Could not bind socket."); } listen(listenSocket, 10);

But then I didn't know how to handle the events with Grand Central Dispatch.

When I try to connect with some client I always get the exception "Connection refused" on client side.

Does anybody have some example code?

la-ga · Accepted Answer · 2015-05-02 08:08:17Z

I found a solution using the POSIX Socket API.

int listenfd = 0; struct sockaddr_in serv_addr; listenfd = socket(AF_INET, SOCK_STREAM, 0); memset(&serv_addr, '0', sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(8008); bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); _listenForConnections = true; listen(listenfd, 10); dispatch_async(dispatch_get_global_queue(0, 0), ^{ NSLog(@"Waiting for connections..."); while (_listenForConnections) { __block int connfd = accept(listenfd, (struct sockaddr*)NULL, NULL); NSLog(@"Connection accepted"); char buffer[1024]; bzero(buffer, 1024); NSString *message = @""; bool continueReading = true; do { recv(connfd , buffer , 1024 , 0); int size = strlen(buffer); if ((buffer[size-1] == '}' && buffer[size-2] == '{')) { continueReading = false; buffer[size-2] = '\0'; } message = [NSString stringWithFormat: @"%@%s", message, buffer]; }while (continueReading); NSLog(@"Got message from client"); char* answer = "Hello World"; write(connfd, answer, strlen(answer)); } NSLog(@"Stop listening."); close(listenfd); });

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