Error With HDEVNOTIFY

Hi,
Currently iam Implementing USB Downloader in Win32 Console Application.
For Auto Detcection Iam registering the device notification like
Notification->hDevNotify = ::RegisterDeviceNotification(
hwnd,
&Filter,
DEVICE_NOTIFY_WINDOW_HANDLE
);

while declaring hdevNotify Iam getting Compilation Error.

struct Notification
{
// device interface class
GUID InterfaceClassGuid;
// handle returned by RegisterDeviceNotification
HDEVNOTIFY hDevNotify;
.......
// constructor

};


d\event_handlers.h(118) : error C2146: syntax error : missing ';' before identifier 'hDevNotify'
d:\event_handlers.h(118) : error C2501: 'HDEVNOTIFY' : missing storage-class or type specifiers
d:\event_handlers.h(118) : error C2501: 'hDevNotify' : missing storage-class or type specifiersh

I have also included #include "stdafx.h" & WinUser.h. Still iam facing this issue.

I need your help.

Thanks in Advance

regards