Hello forum,

I have an MFC dialog application with a USB class of my own.

I would like to be able to receive device notifications in the USB class, but the RegisterDeviceNotification needs a handle for the recipient of the notifications. The only handle I can come up with is the handle for the main dialog class.

So how do I get the handle for my USB class, so that it's the USB class' MESSAGE_MAP that receives the notification?

The call to RegisterDeviceNotification looks like this at the moment:


The call is made from within the USB class, but the member function containing the call to RegisterDeviceNotification is called from the main dialog class' OnInitDialog().

I would somehow like to replace "this" with the handle for the USB class.

The USB class object is created like this:


I'm not sure I have provided enough background information on how to get the handle, so please ask for more if nessasary.

I hope you can help me. Thanks.


Regards,
Futterama

HI,
Is your class is derived from CDialog.
// class USBclass : public CDialog

If yes then u can easily see that CDialog is internally derived from CWnd, which is having a member variable m_hwnd that contains handle to dialog.
For modeless dialog u have to initializes the value m_hwnd by calling Create function of Cwnd class.

your class Cntr will look like something this

USBclass() : CDialog(...)
{
Create(.....) // Just see parameters which has to be passed.
}

After calling create function , your class members will get initilaized and you can get the vlaue of m_hwnd.

USBclass USBclassObj;

You can use value like this
USBclassObj.m_hwnd;

For mOdal dialog instead of calling Create function you have to call another fn. See MSDN for help.

Regards,
Umesh Bansal.