tcp通信

点击查看代码

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

#define SERVER_IP "127.0.0.1"
#define PORT 8080
#define BUFFER_SIZE 1024

int sock;

void *recv_thread(void *arg) {
    char buffer[BUFFER_SIZE];
    while (1) {
        memset(buffer, 0, BUFFER_SIZE);
        int bytes_received = recv(sock, buffer, BUFFER_SIZE, 0);
        if (bytes_received <= 0) {
            perror("Connection closed");
            break;
        }
        printf("Server said: %s\n", buffer);
    }
    close(sock);
    exit(0);
}

int main() {
    struct sockaddr_in serv_addr;
    
    // 创建socket
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Socket creation error");
        exit(EXIT_FAILURE);
    }
    
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    
    // 转换IPv4地址
    if (inet_pton(AF_INET, SERVER_IP, &serv_addr.sin_addr) <= 0) {
        perror("Invalid address/Address not supported");
        exit(EXIT_FAILURE);
    }
    
    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("Connection Failed");
        exit(EXIT_FAILURE);
    }
    
    printf("Connected to server\n");
    
    // 创建接收线程
    pthread_t tid;
    if (pthread_create(&tid, NULL, recv_thread, NULL) != 0) {
        perror("pthread_create");
        exit(EXIT_FAILURE);
    }
    
    // 主线程处理发送
    char message[BUFFER_SIZE];
    while (1) {
        fgets(message, BUFFER_SIZE, stdin);
        message[strcspn(message, "\n")] = 0; // 去除换行符
        
        if (send(sock, message, strlen(message), 0) < 0) {
            perror("send failed");
            break;
        }
    }
    
    return 0;
}

点击查看代码

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

#define SERVER_IP "127.0.0.1"
#define PORT 8080
#define BUFFER_SIZE 1024

int sock;

void *recv_thread(void *arg) {
    char buffer[BUFFER_SIZE];
    while (1) {
        memset(buffer, 0, BUFFER_SIZE);
        int bytes_received = recv(sock, buffer, BUFFER_SIZE, 0);
        if (bytes_received <= 0) {
            perror("Connection closed");
            break;
        }
        printf("Server said: %s\n", buffer);
    }
    close(sock);
    exit(0);
}

int main() {
    struct sockaddr_in serv_addr;
    
    // 创建socket
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Socket creation error");
        exit(EXIT_FAILURE);
    }
    
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    
    // 转换IPv4地址
    if (inet_pton(AF_INET, SERVER_IP, &serv_addr.sin_addr) <= 0) {
        perror("Invalid address/Address not supported");
        exit(EXIT_FAILURE);
    }
    
    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("Connection Failed");
        exit(EXIT_FAILURE);
    }
    
    printf("Connected to server\n");
    
    // 创建接收线程
    pthread_t tid;
    if (pthread_create(&tid, NULL, recv_thread, NULL) != 0) {
        perror("pthread_create");
        exit(EXIT_FAILURE);
    }
    
    // 主线程处理发送
    char message[BUFFER_SIZE];
    while (1) {
        fgets(message, BUFFER_SIZE, stdin);
        message[strcspn(message, "\n")] = 0; // 去除换行符
        
        if (send(sock, message, strlen(message), 0) < 0) {
            perror("send failed");
            break;
        }
    }
    
    return 0;
}

点击查看代码

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

#define PORT 8080
#define BUFFER_SIZE 1024

int client_socket;

void *recv_thread(void *arg) {
    char buffer[BUFFER_SIZE];
    while (1) {
        memset(buffer, 0, BUFFER_SIZE);
        int bytes_received = recv(client_socket, buffer, BUFFER_SIZE, 0);
        if (bytes_received <= 0) {
            perror("Connection closed");
            break;
        }
        printf("Client said: %s\n", buffer);
    }
    close(client_socket);
    exit(0);
}

int main() {
    int server_fd;
    struct sockaddr_in address;
    socklen_t addrlen = sizeof(address);
    
    // 创建socket文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // 设置socket选项
    int opt = 1;
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    // 绑定socket到端口
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    
    // 监听连接
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    
    printf("Server listening on port %d\n", PORT);
    
    // 接受客户端连接
    if ((client_socket = accept(server_fd, (struct sockaddr *)&address, &addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }
    
    printf("Client connected\n");
    
    // 创建接收线程
    pthread_t tid;
    if (pthread_create(&tid, NULL, recv_thread, NULL) != 0) {
        perror("pthread_create");
        exit(EXIT_FAILURE);
    }
    
    // 主线程处理发送
    char message[BUFFER_SIZE];
    while (1) {
        fgets(message, BUFFER_SIZE, stdin);
        message[strcspn(message, "\n")] = 0; // 去除换行符
        
        if (send(client_socket, message, strlen(message), 0) < 0) {
            perror("send failed");
            break;
        }
    }
    
    close(server_fd);
    return 0;
}