C++ socket网络通讯

2020-05-02  本文已影响0人  无聊的CairBin

说明

代码

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


const int MAXLINE = 4096;
const int PORT = 2726;


int sockfd, connfd; //sock句柄和连接句柄
struct sockaddr_in SerAddr;
char buf[MAXLINE];
int size;




using namespace std;

int ServerSockConn()
{
    //检查连接并报错
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        cout << " Socket connect failed:" << errno << endl;
        return 0;
    }
    
    //储存相关信息,如IP等
    memset(&SerAddr, 0, sizeof(SerAddr));
    SerAddr.sin_family = AF_INET;
    SerAddr.sin_port = htons(PORT);
    SerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    
    //检测绑定并报错
    if (bind(sockfd, (struct sockaddr*)&SerAddr, sizeof(SerAddr)) == -1)
    {
        cout << "Bind socket failed: " << errno << endl;
        return 0;
    }
    
    //检测监听并报错
    if( listen(sockfd, 10) == -1)
    {
        cout << "Listen socket failed: " << errno << endl;
        return 0;
    }
}

void GetInfor()
{
    recv(connfd, buf, MAXLINE, 0);
    cout << buf << endl;
    close(connfd);
}

void SendInfor()
{
    send(connfd, "Send", 15, 0);
}

//若为真则接收消息,若为假则发送消息
void ServerInfor(bool adj)
{
    ServerSockConn();
    while(1)
    {
        if ( (connfd = accept(sockfd, (struct sockaddr*)NULL,NULL)) == -1) //同意请求
        {
            cout << "Accept socket failed: " << errno << endl;
            continue;
        }
    
        if (adj == true)
        {
        GetInfor();
        }
        
        else
        {
            SendInfor();
        }
    }
    close(sockfd);
}



//客户端

int socketfd,n;
char recvline[MAXLINE], sendline[MAXLINE];
struct sockaddr_in CliAddr;


//真收,假发

int ClientInfor(bool adj)
{
    socketfd = socket(AF_INET,SOCK_STREAM,0); //建立连接
    if (socketfd == -1)
    {
        cout << "Socket failed:" << errno << endl;
    }
    
    
    CliAddr.sin_family=AF_INET;
     CliAddr.sin_port=htons(PORT);
    CliAddr.sin_addr.s_addr=inet_addr(""); //引号内为服务器公网IP
    bzero(&(CliAddr.sin_zero),8);
    if ( connect(socketfd,(struct sockaddr*)&CliAddr,sizeof(struct sockaddr)) == -1 ){
        cout << "Connect failed:" << errno << endl;        
    }
    else
    {
        if (adj == true)
        {
            recv(socketfd,buf,MAXLINE,0);
            cout << buf << endl;
        }
        else
        {
        cout << "Please input" << endl;
        send(socketfd,"conn",15,0);
        close(socketfd);
        }
    }
    
}



int main()
{
    
    //修改adjust变量来控制消息收发,为真则默认收,为假则发送
    bool adjust = false;
    /*
    说明:
    ClientInfor(); 为客户端使用
    ServerInfor(); 为服务端使用
    二者不能同时用,因为用了相同的buf变量
    通过adjust变量作为函数参数来切换收发
    */


    return 0;
    
}

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