ios socket通信


客户端：

导入头文件：

#import <sys/socket.h>

#import <netinet/in.h>

#import <arpa/inet.h>

#import <unistd.h>

1. 创建连接

CFSocketContext sockContext = {0, // 结构体的版本，必须为0

self, // 一个任意指针的数据，可以用在创建时CFSocket对象相关联。这个指针被传递给所有的上下文中定义的回调。

NULL, // 一个定义在上面指针中的retain的回调， 可以为NULL

NULL, NULL};

CFSocketRef _socket = (kCFAllocatorDefault, // 为新对象分配内存，可以为nil

PF_INET, // 协议族，如果为0或者负数，则默认为PF_INET

SOCK_STREAM, // 套接字类型，如果协议族为PF_INET,则它会默认为SOCK_STREAM

IPPROTO_TCP, // 套接字协议，如果协议族是PF_INET且协议是0或者负数，它会默认为IPPROTO_TCP

kCFSocketConnectCallBack, // 触发回调函数的socket消息类型，具体见Callback Types

TCPServerConnectCallBack, // 上面情况下触发的回调函数

&sockContext // 一个持有CFSocket结构信息的对象，可以为nil

);

if (_socket != nil) {

struct sockaddr_in addr4; // IPV4

memset(&addr4, 0, sizeof(addr4));

addr4.sin_len = sizeof(addr4);

addr4.sin_family = AF_INET;

addr4.sin_port = htons(8888);

addr4.sin_addr.s_addr = inet_addr([strAddress UTF8String]); // 把字符串的地址转换为机器可识别的网络地址

// 把sockaddr_in结构体中的地址转换为Data

CFDataRef address = CFDataCreate(kCFAllocatorDefault, (UInt8 *)&addr4, sizeof(addr4));

CFSocketConnectToAddress(_socket, // 连接的socket

address, // CFDataRef类型的包含上面socket的远程地址的对象

-1 // 连接超时时间，如果为负，则不尝试连接，而是把连接放在后台进行，如果_socket消息类型为kCFSocketConnectCallBack，将会在连接成功或失败的时候在后台触发回调函数

);

CFRunLoopRef cRunRef = CFRunLoopGetCurrent(); // 获取当前线程的循环

// 创建一个循环，但并没有真正加如到循环中，需要调用CFRunLoopAddSource

CFRunLoopSourceRef sourceRef = CFSocketCreateRunLoopSource(kCFAllocatorDefault, _socket, 0);

CFRunLoopAddSource(cRunRef, // 运行循环

sourceRef, // 增加的运行循环源, 它会被retain一次

kCFRunLoopCommonModes // 增加的运行循环源的模式

);

CFRelease(courceRef);

}

2. 设置回调函数

// socket回调函数的格式：

static void TCPServerConnectCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) ｛

if (data != NULL) {

// 当socket为kCFSocketConnectCallBack时，失败时回调失败会返回一个错误代码指针，其他情况返回NULL

NSLog(@"连接失败");

return;

}

TCPClient *client = (TCPClient *)info;

// 读取接收的数据

[info performSlectorInBackground:@selector(readStream) withObject:nil];

｝

3. 接收发送数据

// 读取接收的数据

- (void)readStream {

char buffer[1024];

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

while (recv(CFSocketGetNative(_socket), //与本机关联的Socket 如果已经失效返回－1:INVALID_SOCKET

buffer, sizeof(buffer), 0)) {

NSLog(@"%@", [NSString stringWithUTF8String:buffer]);

}

}

// 发送数据

- (void)sendMessage {

NSString *stringTosend = @"你好";

char *data = [stringTosend UTF8String];

send(SFSocketGetNative(_socket), data, strlen(data) + 1, 0);

}

服务器端：

CFSockteRef _socket;

CFWriteStreamRef outputStream = NULL;

int setupSocket() {

_socket = CFSocketCreate(kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketAcceptCallBack, TCPServerAcceptCallBack, NULL);

if (NULL == _socket) {

NSLog(@"Cannot create socket!");

return 0;

}

int optval = 1;

setsockopt(CFSocketGetNative(_socket), SOL_SOCKET, SO_REUSEADDR, // 允许重用本地地址和端口

(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(port);

addr4.sin_addr.s_addr = htonl(INADDR_ANY);

CFDataRef address = CFDataCreate(kCFAllocatorDefault, (UInt8 *)&addr4, sizeof(addr4));

if (kCFSocketSuccess != CFSocketSetAddress(_socket, address)) {

NSLog(@"Bind to address failed!");

if (_socket)

CFRelease(_socket);

_socket = NULL;

return 0;

}

CFRunLoopRef cfRunLoop = CFRunLoopGetCurrent();

CFRunLoopSourceRef source = CFSocketCreateRunLoopSource(kCFAllocatorDefault, _socket, 0);

CFRunLoopAddSource(cfRunLoop, source, kCFRunLoopCommonModes);

CFRelease(source);

return 1;

}

// socket回调函数，同客户端

void TCPServerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) {

if (kCFSocketAcceptCallBack == type) {

// 本地套接字句柄

CFSocketNativeHandle nativeSocketHandle = *(CFSocketNativeHandle *)data;

uint8_t name[SOCK_MAXADDRLEN];

socklen_t nameLen = sizeof(name);

if (0 != getpeername(nativeSocketHandle, (struct sockaddr *)name, &nameLen)) {

NSLog(@"error");

exit(1);

}

NSLog(@"%@ connected.", inet_ntoa( ((struct sockaddr_in *)name)->sin_addr )):

CFReadStreamRef iStream;

CFWriteStreamRef oStream;

// 创建一个可读写的socket连接

CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativeSocketHandle, &iStream, &oStream);

if (iStream && oStream) {

CFStreamClientContext streamContext = {0, NULL, NULL, NULL};

if (!CFReadStreamSetClient(iStream, kCFStreamEventHasBytesAvaiable,

readStream, // 回调函数，当有可读的数据时调用

&streamContext)){

exit(1);

}

if (!CFReadStreamSetClient(iStream, kCFStreamEventCanAcceptBytes, writeStream, &streamContext)){

exit(1);

}

CFReadStreamScheduleWithRunLoop(iStream, CFRunLoopGetCurrent(), kCFRunLoopCommomModes);

CFWriteStreamScheduleWithRunLoop(wStream, CFRunLoopGetCurrent(), kCFRunLoopCommomModes);

CFReadStreamOpen(iStream);

CFWriteStreamOpen(wStream);

} else {

close(nativeSocketHandle);

}

}

}

// 读取数据

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;

}

main {

char *str = "nihao";

if (outputStream != NULL) {

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

} else {

NSLog(@"Cannot send data!");

}

}

// 开辟一个线程线程函数中

void runLoopInThread() {

int res = setupSocket();

if (!res) {

exit(1);

}

CFRunLoopRun(); // 运行当前线程的CFRunLoop对象

}

原帖地址：http://www.cocoachina.com/bbs/read.php?tid=149651