用C语言完成一对一Socket客户端和用户端程序

以下是一个简单的基于C语言的Socket客户端和服务器端程序的实现，您可以根据自己的需要进行修改和扩展。

服务端程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define MAX_CLIENTS 10
#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
    int server_sock, client_sock, c, read_size;
    struct sockaddr_in server, client;
    char buffer[BUFFER_SIZE];

    // 创建套接字
    server_sock = socket(AF_INET, SOCK_STREAM, 0);
    if (server_sock == -1) {
        printf("Failed to create socket.\n");
        exit(1);
    }

    // 设置服务器地址和端口
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(8888);

    // 绑定套接字到指定地址和端口
    if (bind(server_sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
        printf("Failed to bind socket.\n");
        exit(1);
    }

    // 监听连接请求
    listen(server_sock, MAX_CLIENTS);

    printf("Waiting for connections...\n");

    c = sizeof(struct sockaddr_in);

    // 接受连接请求
    client_sock = accept(server_sock, (struct sockaddr *)&client, (socklen_t *)&c);
    if (client_sock < 0) {
        printf("Failed to accept connection.\n");
        exit(1);
    }

    printf("Client connected.\n");

    // 接收客户端发送的数据
    while ((read_size = recv(client_sock, buffer, BUFFER_SIZE, 0)) > 0) {
        printf("Received message: %s", buffer);

        // 处理客户端发送的数据
        // ...

        // 发送响应数据到客户端
        write(client_sock, "OK", strlen("OK"));
    }

    if (read_size == 0) {
        printf("Client disconnected.\n");
    } else if (read_size == -1) {
        printf("Failed to receive data.\n");
    }

    return 0;
}

客户端程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
    int sock;
    struct sockaddr_in server;
    char message[BUFFER_SIZE], server_reply[BUFFER_SIZE];

    // 创建套接字
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == -1) {
        printf("Failed to create socket.\n");
        exit(1);
    }

    // 设置服务器地址和端口
    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);

    // 连接到服务器
    if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
        printf("Failed to connect to server.\n");
        exit(1);
    }

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

    // 发送数据到服务器
    while (1) {
        printf("Enter message: ");
        fgets(message, BUFFER_SIZE, stdin);

        if (send(sock, message, strlen(message), 0) < 0) {
            printf("Failed to send data.\n");
            exit(1);
        }

        // 接收服务器响应
        if (recv(sock, server_reply, BUFFER_SIZE, 0) < 0) {
            printf("Failed to receive data.\n");
            exit(1);
        }

        printf("Server reply: %s", server_reply);
    }

    close(sock);

    return 0;
}

注意：上述程序是一个简单的示例，没有进行错误处理和异常情况的处理。在实际开发中，应该对这些情况进行充分考虑和处理。