netclient.cpp

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#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 sockClient=socket(AF_INET,SOCK_DGRAM,0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
	addrSrv.sin_family=AF_INET;
	addrSrv.sin_port=htons(6000);

	char recvBuf[100];
	char sendBuf[100];
	char tempBuf[200];

	int len=sizeof(SOCKADDR);

	while(1)
	{
		printf("Please input data:\n");
		gets(sendBuf);
		sendto(sockClient,sendBuf,strlen(sendBuf)+1,0,
			(SOCKADDR*)&addrSrv,len);
		recvfrom(sockClient,recvBuf,100,0,(SOCKADDR*)&addrSrv,&len);
		if('q'==recvBuf[0])
		{
			sendto(sockClient,"q",strlen("q")+1,0,
				(SOCKADDR*)&addrSrv,len);
			printf("Chat end!\n");
			break;
		}
		sprintf(tempBuf,"%s say : %s",inet_ntoa(addrSrv.sin_addr),recvBuf);
		printf("%s\n",tempBuf);

	}
	closesocket(sockClient);
	WSACleanup();
}