socket编程之UDP(windows环境下C++实现)

服务端源代码

#include "stdafx.h"
#include<WinSock2.h>
#include<iostream>
using namespace std;
#pragma comment(lib,"ws2_32.lib")

int _tmain(int argc, _TCHAR* argv[])
{
//初始化socket资源
WSADATA WSAData;
WORD sockVersion=MAKEWORD(2,2);
if(WSAStartup(sockVersion,&WSAData)!=0)
return 0;

SOCKET serSocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);  //创建服务器socket
if(INVALID_SOCKET==serSocket)
{
cout<<"socket error!";
return 0;
}

//设置传输协议、端口以及目的地址
sockaddr_in serAddr;
serAddr.sin_family=AF_INET;
serAddr.sin_port=htons(8888);
serAddr.sin_addr.S_un.S_addr=INADDR_ANY;

if(bind(serSocket,(sockaddr*)&serAddr,sizeof(serAddr))==SOCKET_ERROR)    //将socket绑定地址
{
cout<<"bind error";
closesocket(serSocket);
return 0;
}

sockaddr_in clientAddr;
int iAddrlen=sizeof(clientAddr);
char buff[1024];    //建立接收缓存字节数组
while(true)
{
memset(buff,0,1024);    //清空接收缓存数组
//开始接收数据
int len=recvfrom(serSocket,buff,1024,0,(sockaddr*)&clientAddr,&iAddrlen);
if(len>0)
{
cout<<"客户端地址："<<inet_ntoa(clientAddr.sin_addr)<<endl;
cout<<buff;

//  sendto(serSocket,buff,1024,0,(sockaddr*)&clientAddr,iAddrlen);
}
}

closesocket(serSocket);     //关闭socket
WSACleanup();

return 0;
}

客户端源代码

#include "stdafx.h"
#include<WinSock2.h>
#include<iostream>
using namespace std;
#pragma comment(lib,"ws2_32.lib")

int _tmain(int argc, _TCHAR* argv[])
{
WSADATA WSAData;
WORD sockVersion=MAKEWORD(2,2);
if(WSAStartup(sockVersion,&WSAData)!=0)
return 0;

SOCKET clientSocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(INVALID_SOCKET==clientSocket)
{
cout<<"socket error!";
return 0;
}

sockaddr_in dstAddr;
dstAddr.sin_family=AF_INET;
dstAddr.sin_port=htons(8888);
dstAddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");

const char* sendData="来自客户端的数据包。";
sendto(clientSocket,sendData,strlen(sendData),0,(sockaddr*)&dstAddr,sizeof(dstAddr));

closesocket(clientSocket);
WSACleanup();

return 0;
}