Thread: How to solve the error number 10035?

I write two programsne is to send data,another is to receive
data,and I register a message function,Look:

Code:

WSAAsyncSelect(m_sock,m_hWnd,WM_RNET,FD_READ);
void CTcpFSDlg::OnRNet(WPARAM wParam,LPARAM lParam)
{
         char recvbuf[100];
         int retval,err;
         while(1)
	{
		retval=recv((SOCKET)wParam,recvbuf,100,0);
		if(retval==SOCKET_ERROR)
		{
			err=WSAGetLastError();
			str.Format("recv error=%d",err);
			MessageBox(str);
			break;
		}
		MessageBox(recvbuf);
	}
}

when I send one message,this program can receive it,but it
receive a error number 10035,when I send more than one message,
I only receive the first message and error number 10035,
I want to know how to solve it?