tcp网络编程（C语言）

以下是两个文件.client.c和server.c

server.c

/***********引入必要的文件**************/
#include<stdio.h>

#include<string.h>
#include<sys/types.h>

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

#include<netdb.h>
#include<errno.h>
#include<stdlib.h>
#include<unistd.h>

int main(int argc,char **argv){
    int sock,accetp_sock,sock_len,numbytes,i;
    struct sockaddr_in server_addr;
    struct sockaddr_in client_addr;
    char buff[BUFSIZ];
    
    /*
    *sin_family   AF_INET(ipv4) AF_INET6(ipv6) AF_LOCAL(unix协议) AF_KEY(秘钥)
    */
    server_addr.sin_family = AF_INET;
    //绑定端口
    server_addr.sin_port = htons(8000);
    //绑定本地ip(也就是0.0.0.0)
    //表示本机的所有ip(可能本机有多个网卡，这能代表所有网卡)
    server_addr.sin_addr.s_addr = INADDR_ANY;
    //清零
    bzero(&(server_addr.sin_zero),8);
    sock_len = sizeof(struct sockaddr_in);
    printf("start\n");
    sock = socket(AF_INET,SOCK_STREAM,0);
    //绑定
    while(bind(sock,(struct sockaddr *)&server_addr,sock_len)==-1);
    printf("bind success\n");
    while(listen(sock,10)==-1);
    printf("Listening..\n");
    printf("Ready for Accept,Waiting...\n");
    //开始阻塞
    accetp_sock = accept(sock,(struct sockaddr *)&client_addr,&sock_len);
    printf("Get the client\n");
    numbytes = send(accetp_sock,"Welecome to my server\n",21,0);
    //开始阻塞
    while((numbytes = recv(accetp_sock,buff,BUFSIZ,0))>0){
        buff[numbytes] = '\0';
        printf("%s\n",buff);
        if(send(accetp_sock,buff,numbytes,0)<0){
            perror("write");
            return 1;
        }
    }
    close(accetp_sock);
    close(sock);
    return 0;
}   

client.c

/***********引入必要的文件**************/
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<errno.h>
#include<netdb.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

int main(int argc,char **argv){
    int sockfd,numbers;
    char buf[BUFSIZ];
    struct sockaddr_in sockaddress;
    printf("start:\n");
    while((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1);
    printf("get sockfd:\n");
    /*
    *sin_family   AF_INET(ipv4) AF_INET6(ipv6) AF_LOCAL(unix协议) AF_KEY(秘钥)
    */
    sockaddress.sin_family = AF_INET;
    //绑定端口
    sockaddress.sin_port = htons(8000);
    //连接某个ip
    sockaddress.sin_addr.s_addr = inet_addr(argv[1]);
    //清零
    bzero(&(sockaddress.sin_zero),8);
    //连接
    while(connect(sockfd,(struct sockaddr*)&sockaddress,sizeof(struct sockaddr))==-1);
    printf("Get the server\n");
    //开始阻塞
    numbers = recv(sockfd,buf,BUFSIZ,0);
    buf[numbers]= '\0';
    printf("%s",buf);
    while(1){
        printf("entersome thing:");
        scanf("%s",buf);
        numbers = send(sockfd,buf,sizeof(buf),0);
        //开始阻塞
        numbers = recv(sockfd,buf,BUFSIZ,0);
        buf[numbers]= '\0';
        printf("received:%s\n",buf);
    }
    close(sockfd);
    return 0;
}

运行效果如下

image.png