C++Socket(UDP)

/***********
*服务端程序*
************/
#include 
#include 

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;
	}
	
	//创建套接字
	SOCKET sockSrv = socket(AF_INET, SOCK_DGRAM, 0);
	//创建地址结构体.
	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(6000);

	//绑定套接字和地址.
	bind(sockSrv, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));
	char recvBuf[100];
	char sendBuf[100];
	char tempBuf[200];

	SOCKADDR_IN addrClient;
	int len = sizeof(SOCKADDR);

	while(1){
		//接收数据.
		recvfrom(sockSrv, recvBuf, 100, 0, (SOCKADDR *)&addrClient, &len);
		if('q'==recvBuf[0]){
			sendto(sockSrv, "q", 1, 0, (SOCKADDR *)&addrClient, sizeof(SOCKADDR));
			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);
		//发送数据.
		sendto(sockSrv, sendBuf, 100, 0, (SOCKADDR*)&addrClient, sizeof(SOCKADDR));

	}
	//关闭套接字.
	closesocket(sockSrv);
	//关闭套接字库.
	WSACleanup();
}

/***********
*客户端程序*
************/
#include 
#include 

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

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

	int len = sizeof(SOCKADDR);

	while(1){
		printf("please input date:");
		gets(sendBuf);
		sendto(sockClient, sendBuf,strlen(sendBuf)+1, 0, (SOCKADDR*)&addrClient, len);
		recvfrom(sockClient, recvBuf, 100, 0, (SOCKADDR*)&addrclient, &len);
		if(recvBuf[0] == 'q'){
			sendto(sockClient, '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);
	}
	closesocket(sockClient);
	WSACleanup();
}