服务器和客户端的通信

服务器

#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <stdlib.h>#include <string.h>#define PORT   8888int main(){    int sockfd, ret, fd;    char buf[100] = {0};    struct sockaddr_in server_addr;                //用于存放服务器本身的信息，包括自己的port和ip    struct sockaddr_in client_addr;                //接受客户端连接的时候， 用于存放客户端信息    printf("Start Server!\n");    sockfd = socket(PF_INET, SOCK_STREAM, 0);      //创建socket，处理客户端的连接，不用于发送信息    if (-1 == sockfd)    {        perror("socket");        exit(1);    }    memset(&server_addr, 0, sizeof(server_addr));    server_addr.sin_family = PF_INET;                               //地址族    server_addr.sin_port = PORT;                                    //指定socket的端口号    server_addr.sin_addr.s_addr = inet_addr("192.168.1.111");       //本机ip    ret = bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));   //上述信息绑定到socket    if (-1 == ret)    {        perror("bind");        exit(1);    }    printf("Listening...\n");    ret = listen(sockfd, 5);                               //监听，是否有客户端发起连接    if(-1 == ret)    {        perror("listen");        exit(1);    }    int length = sizeof(client_addr);    fd = accept(sockfd, (struct sockaddr *)&client_addr, &length);//接受客户端的连接，返回值用于发送信息    if (-1 == fd)    {        perror("accept");        exit(1);    }    printf("Accept %d , Port %d\n", fd, client_addr.sin_port);    while (1)    {        ret = recv(fd, buf, sizeof(buf), 0);             //接收消息，从fd里面接收        if (-1 == ret)        {            perror("recv");            exit(1);        }        if (!strcmp(buf, "bye"))        {            break;        }        printf("Recv From Client : %s\n", buf);        memset(buf, 0, sizeof(buf));    }    close(fd);    close(sockfd);    return 0;}

客户端

#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <stdlib.h>#include <string.h>#include <netinet/in.h>#include <arpa/inet.h>#define PORT    8888int main(){    int sockfd, ret;    struct sockaddr_in server_addr;              //向server_addr发起连接    char buf[100] = {0};    sockfd = socket(PF_INET, SOCK_STREAM, 0);    //创建socket，既用于连接，又用于发送消息    if (-1 == sockfd)    {        perror("socket");        exit(1);    }    memset(&server_addr, 0, sizeof(server_addr));     //都是服务器的信息    server_addr.sin_family = PF_INET;    server_addr.sin_port = PORT;    server_addr.sin_addr.s_addr = inet_addr("192.168.1.111");       printf("Start Connecting...\n");    ret = connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));//发起连接    if (-1 == ret)    {        perror("connect");        exit(1);    }    while (1)    {        scanf("%s", buf);        ret = send(sockfd, buf, strlen(buf), 0);      //发送消息        if (-1 == ret)        {            perror("send");            exit(1);        }        if (!strcmp(buf, "bye"))        {            break;        }        memset(buf, 0, sizeof(buf));    }    close(sockfd);    return 0;}