www.gusucode.com > 两个VC网络相关程序：UDP客户端和服务端源码程序 > 两个VC网络相关程序：UDP客户端和服务端源码程序\code\UDP服务器\UDPSever.cpp

    #include<winsock2.h>
#include<stdio.h>
#include<windows.h>
#pragma comment(lib,"WS2_32.lib")
int main()
{
	WSADATA data;
	WORD w=MAKEWORD(2,0);
	char sztext[]="欢迎你\r\n";
	::WSAStartup(w,&data);
	SOCKET s;
	s=::socket(AF_INET,SOCK_DGRAM,0);
	sockaddr_in addr,addr2;
	int n=sizeof(addr2);
	char buff[11]={0};
	addr.sin_family=AF_INET;
	addr.sin_port=htons(75);
	addr.sin_addr.S_un.S_addr=INADDR_ANY;
    ::bind(s,(sockaddr*)&addr,sizeof(addr));
	printf("UDP服务器已经启动\r\n");
while(1)
{
	if(::recvfrom(s,buff,11,0,(sockaddr*)&addr2,&n)!=0)
	{
		printf("%s已经连接上\r\n",inet_ntoa(addr2.sin_addr));
		printf("%s\r\n",buff);
		::sendto(s,sztext,sizeof(sztext),0,(sockaddr*)&addr2,n);
          break;
		} 
}
			::closesocket(s);
		    ::WSACleanup();
		   if(getchar())						//如果有输入则关闭程序
		  {
		  return 0;						//正常结束程序
			}
		  else
		  {::Sleep(100);
			}
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}