HWND_BROADCAST and CDialog

[cchipman]

I've created a simple dialog based app and I am having some message problems. I'm trying to send it a windows mesage of a define user type.

I define the message thus:

#define MW_SHOW_TROY WM_USER + 1

Create the map entry in the dialog.ccp file

	ON_MESSAGE(MW_SHOW_TROY, OnMwShowTroy)

and create the map entry in the h file:

	afx_msg LONG OnMwShowTroy( UINT uParam, LONG lParam );

if I call send message in either of these fashions

	::SendMessage(AfxGetMainWnd()->GetSafeHwnd(), MW_SHOW_TROY,       // message to post
				0x0012345,  // first message parameter
				(LPARAM)pdata);// second message parameter

	AfxGetMainWnd()->SendMessage(MW_SHOW_TROY,       // message to post
				0x0012345,  // first message parameter
				(LPARAM)pdata);// second message parameter

it works. However, if I send it this way:

	::SendMessage(HWND_BROADCAST, MW_SHOW_TROY,       // message to post
			0x0012345,  // first message parameter
			(LPARAM)pdata);// second message parameter

it doesn't. I'm missing something simple, aren't I. I wouldn't be bothering with it, except where having to use a MFC app with a lot of code running in a non-mfc thread, and I'm not wanting to have to pass it a window handle, but wanting to use the broadcast. Do dialog based apps not respond to broadcast messages?

 

[teriviret]

Broadcast messages only go to top-level windows, and not to their children. Maybe your dialog is not set up as a top-level window?