一个简单的Windows TCP服务器实现

初始化

WSADATA wsaData;
SOCKET serverSocket, clientSocket;
struct sockaddr_in serverAddr = { 0x00 };
struct sockaddr_in clientAddr = { 0x00 };
int clientAddrLen = sizeof(clientAddr);if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {printf("WSAStartup failed.\n");
}

创建socket

if ((serverSocket = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {printf("Socket failed.\n");WSACleanup();
}

IP及端口号配置

serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = INADDR_ANY;
serverAddr.sin_port = htons(9988);if (bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {printf("Bind failed.\n")closesocket(serverSocket);WSACleanup();
}

监听客户端连接

if (listen(serverSocket, 5) == SOCKET_ERROR) {printf("Listen failed.\n");closesocket(serverSocket);WSACleanup();
}

接受客户端连接

if ((clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrLen)) == INVALID_SOCKET) {printf("Accept failed.\n");closesocket(serverSocket);WSACleanup();
}

接收

int bytesReceived = recv(clientSocket, (char*)(_sRxBuffer + _sRxLenght), BUFFER_SIZE, 0);

发送

int txPacketlenght = send(socket, (const char*)_sTxBuffer, txPacketlenght, 0);

回收socket资源

closesocket(clientSocket);
closesocket(serverSocket);
WSACleanup();

检查连接断开情形

int bytesReceived = recv(clientSocket, buffer, bufferSize, 0);
if (bytesReceived == 0) {printf("Client socket disconnected gracefully.\n");
} else if (bytesReceived == SOCKET_ERROR) {int error = WSAGetLastError();if (error == WSAECONNRESET) {printf("Client socket disconnected unexpectedly.\n");} else {printf("Recv failed with error: %d\n", error);}
}