代码示例_网络编程_TCP

TCP

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1.　头文件

#pragma once

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <strings.h>
#include <string.h>
#include <linux/in.h>

#define IP "192.168.2.150"
#define PORT 9999
#define SIZE 128

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2.　client_tcp

#include "net.h"

int main(void)
{
    //1.创建套接字
    int fd = socket(AF_INET,SOCK_STREAM,0);
    if(fd<0){
        perror("socket failed");
        exit(1);
    }


    //2.初始服务器地址
    struct sockaddr_in cli;
    cli.sin_family = AF_INET;
    cli.sin_port = htons(PORT);
    cli.sin_addr.s_addr=inet_addr(IP);


    //3.发起连接请求
    if( connect(fd,(struct sockaddr*)&cli,sizeof(cli))<0 ){
        perror("connect failed");
        exit(1);
    }


    //4.写
    char buf[SIZE];
    while(1){
    bzero(buf,SIZE);
    printf("please input:	");
    fgets(buf,SIZE,stdin);
    write(fd,buf,strlen(buf));
        if(strncmp(buf,"quit",4)==0)
        break;
    }

    
    //5.关闭
    close(fd);

    return 0 ;
}

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3.server_tcp

#include "net.h"

int main(void)
{
    //1.创建套接字
    int fd = socket(AF_INET,SOCK_STREAM,0);
    if(fd<0){
        perror("socket failed");
        exit(1);
    }


    //2.初始本地地址
    struct sockaddr_in ser;
    ser.sin_family = AF_INET;
    ser.sin_port = htons(PORT);
    ser.sin_addr.s_addr=inet_addr(IP);


    //3.绑定
    if(  bind(fd,(struct sockaddr*)&ser,sizeof(ser))<0  ){
        perror("bind failed");
        exit(1);
    }


    //4.监听
    if(  listen(fd,5)<0  ){
        perror("listen failed");
        exit(1);
    }


    //5.接收
    int newfd;
    if(   (newfd=accept(fd,NULL,NULL))<0  ){
        perror("accept failed");
        exit(1);
    }


    //6.读
    char buf[SIZE];
    while(1){
    bzero(buf,SIZE);
    int ret = read(newfd,buf,SIZE);
    if(ret<0){
        perror("read failed");
        exit(1);
    }
    else if(ret==0)
        break;
    else
    printf("server : %s",buf);
        if(strncmp(buf,"quit",4)==0)
            break;
    }

    //7.关闭
    close(fd);
    close(newfd);


    return 0 ;
}

测试：

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success ！