udpsrv.cpp

网络编程

#include <Winsock2.h>
#include <stdio.h>

void main()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
 
	wVersionRequested = MAKEWORD( 1, 1 );
 
	err = WSAStartup( wVersionRequested, &wsaData );
	if ( err != 0 ) {
		return;
	}
 
 
	if ( LOBYTE( wsaData.wVersion ) != 1 ||
			HIBYTE( wsaData.wVersion ) != 1 ) {
		WSACleanup( );
		return; 
	}

	SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);
  
	SOCKADDR_IN addrsrv;
	addrsrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
	addrsrv.sin_family=AF_INET;
	addrsrv.sin_port=htons(6000);

	bind(sockSrv,(SOCKADDR*)&addrsrv,sizeof(SOCKADDR));
  
    SOCKADDR_IN addrClient;
	char recvBuf[100];
	int len=sizeof(SOCKADDR);

	recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);
    printf("%s\n",recvBuf);
	closesocket(sockSrv);
	WSACleanup();


}