UDP模式下上位机能不能建立多个socket分别对不同的IP进行一对一的通信？

2019-03-07 03:26:48 437 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

网络通信(Socket/TCP/UDP) TCP/IP传输协议，即传输控制/网络协议，也叫作网络通讯协议。它是在网络的使用中的最基本的通信协议。TCP/IP传输协议对互联网中各部分进行通信的标准和方法进行了规定。并且，TCP/IP传输协议是保证网络数据信息及时、完整传输的两个重要的协议。TCP/IP传输协议是严格来说是一个四层的体系结构，应用层、传输层、网络层和数据链路层都包含其中。[2]TCP/IP协议是Internet最基本的协议,其中应用层的主要协议有TelnetFTPSMTP。阅读详情

我在做一项测试，下位机是2块网络通信模块，都配置为UDP模式，分别配置成不同的IP和端口号，然后通过网线连接到路由器；现在上位机这边我创建了两个socket分别对相应的下位机进行一对一的通信，代码如下：



UINT16 i;



	WORD socketVersion = MAKEWORD(2,2);							

	WSADATA wsaData;											

	SOCKET desSocket_0;										

	SOCKET desSocket_1;

	

	struct sockaddr_in serverAddr[2];							

	int iAddrlen = sizeof(sockaddr_in);

	char szbuffer[10] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09};

	int ret;



	if (WSAStartup(socketVersion,&wsaData) != 0)				 

	{

		printf("Winsock init faied!\r\n");

		WSACleanup();											

		return;

	}



	/* 服务器监听的端口和地址 */

	for(i = 0;i < 2;i ++)

	{

		memset(&serverAddr[i], 0, sizeof(serverAddr));

		serverAddr[i].sin_family = AF_INET;					

	}

	serverAddr[0].sin_port = htons(6000);						

	serverAddr[0].sin_addr.S_un.S_un_b.s_b1 = 192;

	serverAddr[0].sin_addr.S_un.S_un_b.s_b2 = 168;

	serverAddr[0].sin_addr.S_un.S_un_b.s_b3 = 1;

	serverAddr[0].sin_addr.S_un.S_un_b.s_b4 = 120;

	printf("Now connecting the server...\r\n");

	

	desSocket_0 = socket(AF_INET, SOCK_DGRAM, 0);				

	if(desSocket_0 == INVALID_SOCKET)

	{

		printf("Socket0建立失败！\r\n");

		printf("Error mseeage:%d\n",WSAGetLastError());

	}



	serverAddr[1].sin_port = htons(5000);						

	serverAddr[1].sin_addr.S_un.S_un_b.s_b1 = 192;

	serverAddr[1].sin_addr.S_un.S_un_b.s_b2 = 168;

	serverAddr[1].sin_addr.S_un.S_un_b.s_b3 = 1;

	serverAddr[1].sin_addr.S_un.S_un_b.s_b4 = 130;

	printf("Now connecting the server...\r\n");



	desSocket_1 = socket(AF_INET, SOCK_DGRAM, 0);				

	if(desSocket_1 == INVALID_SOCKET)

	{

		printf("Socket1建立失败！\r\n");

		printf("Error mseeage:%d\n",WSAGetLastError());

	}



	while(true)

	{

		ret = sendto(desSocket_0, szbuffer, sizeof(szbuffer), 0, (struct  sockaddr*)&serverAddr[0], iAddrlen);

		if(ret != SOCKET_ERROR)

		{

			Sleep(1000);

			ret = recvfrom(desSocket_0, szbuffer, sizeof(szbuffer), 0, (struct sockaddr*)&serverAddr[0], &iAddrlen);

			if(ret != SOCKET_ERROR)

			{

				printf("recive from server:%d\r\n", 0);

			}

			else

				printf("Socket0ReciveError:%d\n",WSAGetLastError());

		}

		else

			printf("Socket0SendError:%d\n",WSAGetLastError());



		Sleep(1000);

		ret = sendto(desSocket_1, szbuffer, sizeof(szbuffer), 0, (struct  sockaddr*)&serverAddr[1], iAddrlen);

		if(ret != SOCKET_ERROR)

		{

			Sleep(1000);

			ret = recvfrom(desSocket_1, szbuffer, sizeof(szbuffer), 0, (struct sockaddr*)&serverAddr[1], &iAddrlen);

			if(ret != SOCKET_ERROR)

			{

				printf("recive from server:%d\r\n", 1);

			}

			else

				printf("Socket1ReciveError:%d\n",WSAGetLastError());

		}

		else

			printf("Socket1SendError:%d\n",WSAGetLastError());



		Sleep(1000);

	}

	closesocket(desSocket_0);										

	closesocket(desSocket_1);										

	printf("通讯失败！\r\n");

	return;