梅科尔-华为14天实战开发-网络应用开发（一）

UDP客户端

UDP相关协议API介绍

客户端创建流程

实现客户端

static void UDPClientTask(void)
{
    //服务器的地址信息
    struct sockaddr_in send_addr;
    socklen_t addr_length = sizeof(send_addr);
    char recvBuf[512];

    //连接Wifi
    WifiConnect("TP-LINK_65A8", "0987654321");

    //创建socket
    if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
    {
        perror("create socket failed!\r\n");
        exit(1);
    }

    //初始化预连接的服务端地址
    send_addr.sin_family = AF_INET;
    send_addr.sin_port = htons(_PROT_);
    send_addr.sin_addr.s_addr = inet_addr("192.168.0.175");
    addr_length = sizeof(send_addr);

    //总计发送 count 次数据
    while (1)
    {
        bzero(recvBuf, sizeof(recvBuf));

        //发送数据到服务远端
        sendto(sock_fd, send_data, strlen(send_data), 0, (struct sockaddr *)&send_addr, addr_length);

        //线程休眠一段时间
        sleep(10);

        //接收服务端返回的字符串
        recvfrom(sock_fd, recvBuf, sizeof(recvBuf), 0, (struct sockaddr *)&send_addr, &addr_length);
        printf("%s:%d=>%s\n", inet_ntoa(send_addr.sin_addr), ntohs(send_addr.sin_port), recvBuf);
    }

    //关闭这个 socket
    closesocket(sock_fd);
}

TCP服务端

TCP相关协议API介绍

TCP服务端创建流程

实现流程以及代码

	//创建socket
	if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket is error\r\n");
		exit(1);
	}

	bzero(&server_sock, sizeof(server_sock));
	server_sock.sin_family = AF_INET;
	server_sock.sin_addr.s_addr = htonl(INADDR_ANY);
	server_sock.sin_port = htons(_PROT_);

	//调用bind函数绑定socket和地址
	if (bind(sock_fd, (struct sockaddr *)&server_sock, sizeof(struct sockaddr)) == -1)
	{
		perror("bind is error\r\n");
		exit(1);
	}

	//调用listen函数监听(指定port监听)
	if (listen(sock_fd, TCP_BACKLOG) == -1)
	{
		perror("listen is error\r\n");
		exit(1);
	}

	printf("start accept\n");