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流程伪代码

//1、加载库//2、创建套接字//3、连接服务端while(true){//4、发送数据//5、接收数据}
//6、关闭套接字、卸载库

代码实现

加载库

	int err = 0;WORD version = MAKEWORD(2, 2);WSADATA wsaData;err = WSAStartup(version, &wsaData);if (err != 0) {cout << "WSAStartup error:" << WSAGetLastError() << endl;return 1;}if (2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion)) {cout << "WSAStartup version error" << endl;WSACleanup();return 1;}else {cout << "WSAStartup success" << endl;}

创建套接字

	SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (INVALID_SOCKET == sock) {cout << "socket error:" << WSAGetLastError() << endl;WSACleanup();return 1;}else {cout << "socket success" << endl;}

连接服务端

连接服务端我们使用的是connect()函数，分别为连接使用的socket，连接的地址信息，连接的地址信息长度。返回值为int类型，如果没有错误返回0，否则返回SOCKET_ERROR。

	sockaddr_in addrServer;addrServer.sin_family = AF_INET;addrServer.sin_port = htons(456789);addrServer.sin_addr.S_un.S_addr = inet_addr("192.168.44.1");int nLen = sizeof(addrServer);err = connect(sock, (sockaddr*)&addrServer, nLen);if (err == SOCKET_ERROR) {cout << "connect error:" << WSAGetLastError() << endl;closesocket(sock);WSACleanup();return 1;}else {cout << "connect success" << endl;}

收发数据

	int nSendNum = 0;char sendBuf[1024] = "";int nRecvNum = 0;char recvBuf[1024] = "";while (true) {//发送数据gets_s(sendBuf);nSendNum = send(sock, sendBuf, sizeof(sendBuf), 0);if (nSendNum == SOCKET_ERROR) {cout << "send error:" << WSAGetLastError() << endl;break;}//接收数据nRecvNum = recv(sock, recvBuf, sizeof(recvBuf), 0);if (nRecvNum < 0) {cout << "recv error" << WSAGetLastError() << endl;break;}else {cout << "say:" << recvBuf << endl;}}

关闭套接字、卸载库

	closesocket(sock);WSACleanup();

这样我们的TCP协议简单通讯就写好了。

测试

先运行服务端再运行客户端

没有什么问题，可以一人说一句话