recvfrom的返回值为-1，不知哪里出了错

//这是服务器发送

void UDPSocketServer::Send(DWORD IP, int Port,char str[1000])

{

  //绑定本地端口号和IP



	SOCKET sockServer = socket(AF_INET,SOCK_DGRAM,0);

	SOCKADDR_IN addrServer;

	addrServer.sin_addr.S_un.S_addr = inet_addr("192.168.1.104");

	addrServer.sin_family = AF_INET;

	addrServer.sin_port = htons(32550);



	int ss = bind(sockServer,(SOCKADDR *)&addrServer,sizeof(SOCKADDR));

	



	//获取客户端信息

/*	tempAddr.S_un.S_addr=IP;

	strcpy_s(buf,inet_ntoa(tempAddr));

	p=(LPCTSTR)buf;*/

	

	SOCKADDR_IN addrClient;

	addrClient.sin_addr.S_un.S_addr = inet_addr("192.168.1.104");

	addrClient.sin_family = AF_INET;

	addrClient.sin_port = htons(32551);



	int Byte = sendto(sockServer,str,strlen(str)+1,0,(SOCKADDR*)&addrClient,sizeof(SOCKADDR));



//这是客户端接收

void UDPSocketClient::Receive(DWORD IP, int Port)

{

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

	SOCKADDR_IN addrServer;addrServer.sin_addr.S_un.S_addr = inet_addr("192.168.1.104");

	addrServer.sin_family = AF_INET;

	addrServer.sin_port = htons(Port);

	int len = sizeof(SOCKADDR);

	char recvBuff[256]="";

	int Byte = recvfrom(sockClient,recvBuff,256,0,(SOCKADDR *)&addrServer,&len);

}

//这是调用的代码

        UDPSocketServer udpS;

	udpS.Send(inet_addr("192.168.1.104"),32550, "Server said");

	UDPSocketClient udpC;

	udpC.Receive(inet_addr("192.168.1.104"),32550);