目前正在写一iOS客户端，内容是客户端向服务端发送一段命令，服务端通过某端口向客户端发送图像 我用CFSocket,CFStream写了如下代码； 但是在文件接收后，无法得知何时文件已经传送完成，也没有个完成状态神马的： kCFStreamEventEndEncountered这里也不被执行； 用了GCDAsyncSocket也是如此，

因为不想改变服务端原有的架构，所以尽量不通过协议来解决； iOS在文件传输完毕之后有EOF之类的标识么？

int setupSocket() {

_receiveData = [[NSMutableData alloc] init];

_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, (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(12000);
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;

}

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

    CFReadStreamRef iStream;

    // 创建一个可读写的socket连接
    CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativeSocketHandle, &iStream, NULL);
    if (iStream) {
        CFStreamClientContext streamContext = {0, NULL, NULL, NULL};
        if (!CFReadStreamSetClient(iStream,
                                   kCFStreamEventHasBytesAvailable,
                                   readStream, // 回调函数，当有可读的数据时调用
                                   &streamContext)){
            exit(1);
        }


        CFReadStreamScheduleWithRunLoop(iStream, CFRunLoopGetCurrent(), kCFRunLoopCommonModes);
        CFReadStreamOpen(iStream);
    } else {
        close(nativeSocketHandle);
    }
}

}

// 读取数据 void readStream(CFReadStreamRef stream, CFStreamEventType eventType, void *clientCallBackInfo) {

printf("新一轮开始了----------------------");

switch (eventType) {
    case kCFStreamEventEndEncountered:

        NSLog(@"完成");

        break;
    case kCFStreamEventHasBytesAvailable:
    {
        UInt8 buff[1024];
        CFReadStreamRead(stream, buff, 1024);
        for (int i = 0; i <1024; i++) {
            printf("index:%d-%dn",i,buff[i]);
        }
        [_receiveData appendData:[NSData dataWithBytes:buff length:1024]];
    }
    default:
        break;
}

}