udpclient.cpp

用Visual C++编写的UDP客户端程序。

#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 sck=socket(AF_INET,SOCK_DGRAM,0);
	sockaddr_in addrsrv;
	addrsrv.sin_addr.S_un.S_addr=inet_addr("192.168.0.6"/*"127.0.0.1"*/);
	addrsrv.sin_family=AF_INET;
	addrsrv.sin_port=htons(5050);
	int sendbuf1[100]={0,0,0,0,0,8,1,15,0,0,0,8,1,7};
	char sendbuf[100]="000008115000817"/*"welcome to host world"*/;
	sendto(sck,sendbuf,strlen(sendbuf)+1,0,(sockaddr*)&addrsrv,sizeof(addrsrv));
	closesocket(sck);
	WSACleanup();
}