VC++ MFC - WM_DEVICECHANGE message handling

[Simon Sadler]

I have a bit of a problem.

I have a simple, dialog based, VC++ app using the MFC, it does nothing except
what the app wizard produced. I want my app to pick up and process the
WM_DEVICECHANGE message which gets sent to top level windows when the os detects
a device change (surprise surprise), e.g. something being plugged in a USB port
etc. However when I go to class wizard to add the message handler, no matter what
class I select the message never appears as one that I can handle!! Obviously I
don't want to go messing with the app wizard generated code .

Any suggestions? Ideally some sample code would great.

Cheers

Simon

[David Lowndes]

>I have a simple, dialog based, VC++ app using the MFC, it does nothing except
>what the app wizard produced. I want my app to pick up and process the
>WM_DEVICECHANGE message which gets sent to top level windows when the os detects
>a device change (surprise surprise), e.g. something being plugged in a USB port
>etc. However when I go to class wizard to add the message handler, no matter what
>class I select the message never appears as one that I can handle!

Simon,

Class Wizard only supports the more common messages. It's not
difficult to add a message handler yourself, however searching though
the MFC docs, there is already one you can use.

Add ON_WM_DEVICECHANGE() to your message map, and implement a member
function afx_msg void OnDeviceChange( UINT, DWORD ).

Dave
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[Sam Hobbs]

The first thing I do in situations such as this is to look in the
documentation, which you have already done. The next step for me is to
search the documentation. I discovered that the WM_DEVICECHANGE message is
sent as a WM_COMMAND message. I also found CWnd::OnDeviceChange, but I sure
do not find any of those in the ClassWizard.

So my next step sometimes is to search the internet. I found the CodeGuru
web site a few years ago by searching the internet for an API function. I
found:

http://codeguru.earthweb.com/multimedia/cd_audio.shtml

Which might help.

"Simon Sadler" <simon....@sema.co.uk> wrote in message
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