public static IntPtr DoRegisterDeviceClassNotification(IntPtr hWnd, Guid devclass)
{
var mm = new MemPtr();
var bh = new DEV_BROADCAST_HDR();
var di = new DEV_BROADCAST_DEVICEINTERFACE();
bh.dbch_size = Marshal.SizeOf <DEV_BROADCAST_HDR>();
di.dbcc_size = Marshal.SizeOf <DEV_BROADCAST_DEVICEINTERFACE>();
bh.dbch_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
di.dbcc_classguid = devclass;
mm.Alloc(bh.dbch_size + di.dbcc_size);
mm.FromStruct(bh);
mm.FromStructAt(bh.dbch_size, di);
var ret = RegisterDeviceNotification(hWnd, mm, DEVICE_NOTIFY_WINDOW_HANDLE);
mm.Free();
return(ret);
}
