用winsock编写一个C/S通讯

好的，以下是一个简单的基于 Winsock 的 C/S 通讯例子，其中客户端和服务器端都是使用 C 语言编写的。

服务器端代码：

#include <stdio.h>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsa;
    SOCKET server_sock, client_sock;
    struct sockaddr_in server_addr, client_addr;
    int client_addr_size = sizeof(client_addr);
    char buffer[1024] = {0};

    // 初始化 Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("Failed. Error Code : %d", WSAGetLastError());
        return 1;
    }

    // 创建服务器端套接字
    if ((server_sock = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
        printf("Could not create socket : %d", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 初始化服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(8888);

    // 绑定服务器端套接字
    if (bind(server_sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        printf("Bind failed with error code : %d", WSAGetLastError());
        closesocket(server_sock);
        WSACleanup();
        return 1;
    }

    // 监听客户端连接请求
    listen(server_sock, 3);

    printf("Server listening on port 8888...\n");

    // 接收客户端连接并处理
    while ((client_sock = accept(server_sock, (struct sockaddr*)&client_addr, &client_addr_size)) != INVALID_SOCKET) {
        printf("Connection accepted from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

        // 接收客户端数据并回复
        while (1) {
            // 接收客户端数据
            int num_bytes = recv(client_sock, buffer, sizeof(buffer), 0);
            if (num_bytes == SOCKET_ERROR) {
                printf("recv failed with error code : %d", WSAGetLastError());
                closesocket(client_sock);
                WSACleanup();
                return 1;
            }
            if (num_bytes == 0) {
                printf("Connection closed by client.\n");
                closesocket(client_sock);
                break;
            }

            // 处理客户端数据
            buffer[num_bytes] = '\0';
            printf("Received message from %s:%d: %s\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), buffer);

            // 回复客户端数据
            if (send(client_sock, buffer, num_bytes, 0) == SOCKET_ERROR) {
                printf("send failed with error code : %d", WSAGetLastError());
                closesocket(client_sock);
                WSACleanup();
                return 1;
            }
        }
    }

    // 关闭服务器端套接字
    closesocket(server_sock);

    // 清理 Winsock
    WSACleanup();

    return 0;
}

客户端代码：

#include <stdio.h>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsa;
    SOCKET sock;
    struct sockaddr_in server_addr;
    char buffer[1024] = {0};

    // 初始化 Winsock
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("Failed. Error Code : %d", WSAGetLastError());
        return 1;
    }

    // 创建客户端套接字
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
        printf("Could not create socket : %d", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 初始化服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // 连接服务器端套接字
    if (connect(sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        printf("Connect failed with error code : %d", WSAGetLastError());
        closesocket(sock);
        WSACleanup();
        return 1;
    }

    printf("Connected to server.\n");

    // 发送数据到服务器端并接收回复
    while (1) {
        // 发送数据到服务器端
        printf("Enter message: ");
        gets_s(buffer, sizeof(buffer));
        if (send(sock, buffer, strlen(buffer), 0) == SOCKET_ERROR) {
            printf("send failed with error code : %d", WSAGetLastError());
            closesocket(sock);
            WSACleanup();
            return 1;
        }

        // 接收服务器端回复
        int num_bytes = recv(sock, buffer, sizeof(buffer), 0);
        if (num_bytes == SOCKET_ERROR) {
            printf("recv failed with error code : %d", WSAGetLastError());
            closesocket(sock);
            WSACleanup();
            return 1;
        }
        if (num_bytes == 0) {
            printf("Connection closed by server.\n");
            closesocket(sock);
            break;
        }

        // 处理服务器端回复
        buffer[num_bytes] = '\0';
        printf("Received message from server: %s\n", buffer);
    }

    // 关闭客户端套接字
    closesocket(sock);

    // 清理 Winsock
    WSACleanup();

    return 0;
}

这个例子简单地实现了一个回显服务器，客户端向服务器发送数据，服务器接收到数据后将其回传给客户端。你可以在这个例子的基础上进行扩展和修改，以满足你的具体需求。