[C++] socket - 2 [UDP通信C/S实例]

 

服务端：

#include<iostream>
#include<winsock2.h>
#include<stdio.h>
#pragma comment(lib,"WS2_32.lib")//显示连接套接字库
int main()
{
    WSADATA data;//定义WSADATA结构体
    WORD w=MAKEWORD(2,0);//定义版本号
    char sztext[]="Welcome you\r\n";//定义并初始化发送到客户端的字符数组
    ::WSAStartup(w,&data);//初始化套接字库
    SOCKET s;
    s=::socket(AF_INET,SOCK_DGRAM,0);
    sockaddr_in addr,addr2;//定义套接字地址结构
    int n=sizeof(addr2);
    char buff[16]={0};//接收数据缓冲区
    addr.sin_family=AF_INET;//初始化地质结构
    addr.sin_port=htons(75);
    addr.sin_addr.S_un.S_addr=INADDR_ANY;
    ::bind(s,(sockaddr*)&addr,sizeof(addr));//绑定套接字
    printf("UDP Server already start!\r\n");
    if(::recvfrom(s,buff,16,0,(sockaddr*)&addr2,&n)!=-1)//接收客户端信息
    {
        printf("%s already connect\r\n",inet_ntoa(addr2.sin_addr));
        ::sendto(s,sztext,sizeof(sztext),0,(sockaddr*)&addr2,n);//向客户端发送字符数组
        ::closesocket(s);//关闭套接字句柄
        ::WSACleanup();//释放套接字库
    }
    if(getchar())
    {
        return 0;
    }
    else
    {
        ::Sleep(100);
    }
}

 

客户端：

#include<iostream>
#include<winsock2.h>
#include<stdio.h>
#pragma comment(lib,"WS2_32.lib")//显示连接套接字库
int main()
{
    WSADATA data;//定义WSADATA结构体
    WORD w=MAKEWORD(2,0);//定义版本号
    ::WSAStartup(w,&data);//初始化套接字库
    SOCKET s;
    s=::socket(AF_INET,SOCK_DGRAM,0);//创建TCP套接字
    sockaddr_in addr,addr2;
    int n=sizeof(addr2);
    char buff[16]="Wde";
    char sztext[16]={0};
    addr.sin_family=AF_INET;//初始化地质结构
    addr.sin_port=htons(75);
    addr.sin_addr.S_un.S_addr=inet_addr("10.203.117.150");
    printf("UDP Clienct already start\r\n");
    if(::sendto(s,sztext,sizeof(sztext),0,(sockaddr*)&addr,n)!=0)
    {
        ::recvfrom(s,buff,16,0,(sockaddr*)&addr2,&n);
        printf("Server say:%s\r\n",buff);
        ::closesocket(s);
        ::WSACleanup();//释放套接字库
    }
    if(getchar())
    {
        return 0;
    }
    else
    {
        ::Sleep(100);
    }
}