#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(23456);

	bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

	char recvBuf[100];
	char sendBuf[100];
	char tempBuf[200];
	memset(tempBuf,0,200);

	SOCKADDR_IN addrClient;
	int len=sizeof(SOCKADDR);

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