用标准C语言在window环境下写基于tcp协议的socket多次通信

下面是一个基于TCP协议的socket客户端和服务器端的示例代码，可以在Windows环境下使用标准C语言编写。

客户端：

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

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

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

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("WSAStartup failed with error: %d\n", WSAGetLastError());
        return 1;
    }

    // 创建socket
    if ((client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET) {
        printf("socket creation failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // 连接服务器
    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        printf("connect failed with error: %d\n", WSAGetLastError());
        closesocket(client_socket);
        WSACleanup();
        return 1;
    }

    // 发送消息
    printf("Enter message: ");
    fgets(message, sizeof(message), stdin);
    send(client_socket, message, strlen(message), 0);

    // 接收响应
    bytes_received = recv(client_socket, buffer, sizeof(buffer), 0);
    if (bytes_received == SOCKET_ERROR) {
        printf("recv failed with error: %d\n", WSAGetLastError());
        closesocket(client_socket);
        WSACleanup();
        return 1;
    }

    // 输出响应
    printf("Received: %s\n", buffer);

    // 关闭socket和Winsock库
    closesocket(client_socket);
    WSACleanup();

    return 0;
}

服务器端：

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

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

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

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("WSAStartup failed with error: %d\n", WSAGetLastError());
        return 1;
    }

    // 创建socket
    if ((server_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET) {
        printf("socket creation failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8080);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    // 绑定socket到指定地址和端口
    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        printf("bind failed with error: %d\n", WSAGetLastError());
        closesocket(server_socket);
        WSACleanup();
        return 1;
    }

    // 监听连接请求
    if (listen(server_socket, SOMAXCONN) == SOCKET_ERROR) {
        printf("listen failed with error: %d\n", WSAGetLastError());
        closesocket(server_socket);
        WSACleanup();
        return 1;
    }

    // 接受客户端连接
    if ((client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &client_addr_size)) == INVALID_SOCKET) {
        printf("accept failed with error: %d\n", WSAGetLastError());
        closesocket(server_socket);
        WSACleanup();
        return 1;
    }

    // 接收消息
    bytes_received = recv(client_socket, buffer, sizeof(buffer), 0);
    if (bytes_received == SOCKET_ERROR) {
        printf("recv failed with error: %d\n", WSAGetLastError());
        closesocket(client_socket);
        closesocket(server_socket);
        WSACleanup();
        return 1;
    }

    // 输出消息
    printf("Received: %s\n", buffer);

    // 发送响应
    send(client_socket, "Hello from server!", strlen("Hello from server!"), 0);

    // 关闭socket和Winsock库
    closesocket(client_socket);
    closesocket(server_socket);
    WSACleanup();

    return 0;
}