tcp客户端与服务器通信 c++ 代码实现

以下是一个基本的TCP客户端与服务器通信的C代码实现。

服务器端：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int main()
{
    int server_socket, client_socket;
    struct sockaddr_in server_addr, client_addr;
    char buffer[1024];
    int bytes_received, bytes_sent;
    socklen_t client_addr_len;

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    server_addr.sin_addr.s_addr = INADDR_ANY;

    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket < 0) {
        perror("socket");
        exit(1);
    }

    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind");
        exit(1);
    }

    if (listen(server_socket, 5) < 0) {
        perror("listen");
        exit(1);
    }

    printf("Server started...\n");

    while (1) {
        client_addr_len = sizeof(client_addr);
        client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &client_addr_len);
        if (client_socket < 0) {
            perror("accept");
            exit(1);
        }

        printf("Client connected: %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

        while (1) {
            memset(buffer, 0, sizeof(buffer));
            bytes_received = recv(client_socket, buffer, sizeof(buffer), 0);
            if (bytes_received < 0) {
                perror("recv");
                exit(1);
            } else if (bytes_received == 0) {
                printf("Client disconnected: %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
                break;
            }

            printf("Received from client: %s", buffer);

            bytes_sent = send(client_socket, buffer, bytes_received, 0);
            if (bytes_sent < 0) {
                perror("send");
                exit(1);
            }
        }

        close(client_socket);
    }

    close(server_socket);
    return 0;
}

客户端：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>

int main()
{
    int client_socket;
    struct sockaddr_in server_addr;
    struct hostent *server;
    char buffer[1024];
    int bytes_received, bytes_sent;

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(8888);
    server = gethostbyname("localhost");
    if (server == NULL) {
        fprintf(stderr, "Error: no such host\n");
        exit(1);
    }
    memcpy(&server_addr.sin_addr.s_addr, server->h_addr, server->h_length);

    client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket < 0) {
        perror("socket");
        exit(1);
    }

    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("connect");
        exit(1);
    }

    printf("Connected to server: %s:%d\n", inet_ntoa(server_addr.sin_addr), ntohs(server_addr.sin_port));

    while (1) {
        memset(buffer, 0, sizeof(buffer));
        printf("Enter message: ");
        fgets(buffer, sizeof(buffer), stdin);

        bytes_sent = send(client_socket, buffer, strlen(buffer), 0);
        if (bytes_sent < 0) {
            perror("send");
            exit(1);
        }

        bytes_received = recv(client_socket, buffer, sizeof(buffer), 0);
        if (bytes_received < 0) {
            perror("recv");
            exit(1);
        } else if (bytes_received == 0) {
            printf("Server disconnected\n");
            break;
        }

        printf("Received from server: %s", buffer);
    }

    close(client_socket);
    return 0;
}