c语言tcp通信demo

你好，以下是一个简单的 C 语言 TCP 通信的示例代码：

服务端代码：

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

#define PORT 8888
#define MAXLINE 1024

int main() {
    int sockfd, connfd;
    struct sockaddr_in servaddr, cliaddr;
    char buff[MAXLINE];
    int n;

    sockfd = socket(AF_INET, SOCK_STREAM, );
    if (sockfd == -1) {
        perror("socket");
        exit(1);
    }

    memset(&servaddr, , sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(PORT);

    if (bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) == -1) {
        perror("bind");
        exit(1);
    }

    if (listen(sockfd, 10) == -1) {
        perror("listen");
        exit(1);
    }

    printf("server listening on port %d...\n", PORT);

    while (1) {
        socklen_t len = sizeof(cliaddr);
        connfd = accept(sockfd, (struct sockaddr *)&cliaddr, &len);
        if (connfd == -1) {
            perror("accept");
            continue;
        }

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

        while ((n = recv(connfd, buff, MAXLINE, )) > ) {
            buff[n] = '\';
            printf("received: %s", buff);
            send(connfd, buff, n, );
        }

        if (n == ) {
            printf("client closed connection\n");
        } else {
            perror("recv");
        }

        close(connfd);
    }

    close(sockfd);

    return ;
}

客户端代码：

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

#define PORT 8888
#define MAXLINE 1024

int main() {
    int sockfd;
    struct sockaddr_in servaddr;
    char buff[MAXLINE];
    int n;

    sockfd = socket(AF_INET, SOCK_STREAM, );
    if (sockfd == -1) {
        perror("socket");
        exit(1);
    }

    memset(&servaddr, , sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr("127...1");
    servaddr.sin_port = htons(PORT);

    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) == -1) {
        perror("connect");
        exit(1);
    }

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

    while (fgets(buff, MAXLINE, stdin) != NULL) {
        send(sockfd, buff, strlen(buff), );
        n = recv(sockfd, buff, MAXLINE, );
        if (n == -1) {
            perror("recv");
            exit(1);
        } else if (n == ) {
            printf("server closed connection\n");
            break;
        } else {
            buff[n] = '\';
            printf("received: %s", buff);
        }
    }

    close(sockfd);

    return ;
}

希望对你有帮助。