socket

来源：互联网发布：淘宝上的摩托车能买吗编辑：程序博客网时间：2024/06/05 02:17

    dispatch_async(dispatch_get_global_queue(0,0), ^{

        sendMsgSocketfd = socket(AF_INET,SOCK_STREAM,0);

        struct sockaddr_in addr;

        const char *ipadd = [IPAddrcStringUsingEncoding:NSUTF8StringEncoding];

        memset(&addr,0,sizeof(addr));
        addr.sin_family= AF_INET;
        addr.sin_port= htons(port);
        //这个函数转换字符串到网络地址，第一个参数af是地址簇，第二个参数*src是来源地址，第三个参数* dst接收转换后的数据。
        inet_pton(AF_INET, ipadd, &addr.sin_addr);

        int connect_fd =connect(sendMsgSocketfd, (structsockaddr*)&addr,sizeof(addr));
        if (connect_fd == -1) {

            NSLog(@"connect error :%s",strerror(errno));
        }

        NSLog(@" >> Successfully connected to");

        const char *cMsg = [msgcStringUsingEncoding:NSUTF8StringEncoding];

        send(sendMsgSocketfd,cMsg , strlen(cMsg),0);

        //buffer malloc 开辟一块这么大的内存空间
        char *buffer =malloc(MAX_Buffer);

        //接收
        recv(sendMsgSocketfd, buffer, MAX_Buffer,0);

        NSString *str = [NSStringstringWithCString:bufferencoding:NSUTF8StringEncoding];

        dispatch_async(dispatch_get_main_queue(), ^{

            NSLog(@"client receive msg %@",str);
        });

        close(sendMsgSocketfd);

    });

}

/*

1.打开socket，获得描述字    socket()
2.绑定IP地址 bind()
3.开始收听连接 listen()
4.同意连接    accept()   同步函数，会卡死当前线程，直到有客户端连接时
5.接收数据rev()
6.close

*/
+(void)buildServer:(int)port withMsgBlock:(MsgBlock)block{

    dispatch_async(dispatch_get_global_queue(0,0), ^{

        serverSocketfd = socket(AF_INET,SOCK_STREAM,0);

        struct sockaddr_in addr;

        memset(&addr,0,sizeof(addr));
        addr.sin_family= AF_INET;
        addr.sin_port= htons(port);
        addr.sin_addr.s_addr= htonl(INADDR_ANY);

        int bindSuccess = bind(serverSocketfd,(structsockaddr*) &addr,sizeof(addr));
        if (bindSuccess == -1) {

            NSLog(@"bind error : %s",strerror(errno));

        }

        listen(serverSocketfd,10);

        NSLog(@"-------waiting for client`s request--------");

        while (1) {

            int connectfd =accept(serverSocketfd,NULL,NULL);

            if (connectfd == -1) {
                continue;
            }


            char *buffer =malloc(MAX_Buffer);
            //char buffer[MAX_Buffer];

            //接收
            recv(connectfd, buffer,MAX_Buffer,0);

            NSString *str = [NSStringstringWithCString:bufferencoding:NSUTF8StringEncoding];

            dispatch_async(dispatch_get_main_queue(), ^{
                block(str);
            });

            const char *sendmm ="hello world";
            send(connectfd,sendmm ,strlen(sendmm),0);
            NSLog(@"send success");

            close(connectfd);
        }

    });
}

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