Re: Fail to GetSafeHwnd() in Modeless Dialog

"Alexander Nickolov" <>
Mon, 19 Jun 2006 12:38:04 -0700
If this is not an MFC window, you can't use MFC functions
with it. ATL's classes derive from CWindow that has a m_hWnd
member for the window's HWND. Use that instead.

Alexander Nickolov
Microsoft MVP [VC], MCSD

<> wrote in message

Dear All,

I have a question about Modeless Window.

In the generic MFC Dialog application, I start a Thread by

I pass the HWND (GetSafeHwnd())to the Thread as a param. Then in the
thread, upon something happen, it will use the HWND to post a message
back to the Dialog, like below

::PostMessage((HWND) pParam, WM_MSG1, 0, 0);
Then I can post a message back to the Dialog and the corresponding
function can be called.
The above works fine.

BUT now I am in a different situation. I try to develop a Modeless
Dialog and use the above mechanism to post a message back from the
thread to the modeless dialog. BUT this time the GetSafeHwnd() function
returns NULL. Also the m_hWnd variable in the modeless Dialog is NULL
as well.

Does anyone have idea on how to solve it?

Actually I implement this Modeless Dialog in an ATL COM server. Will it
cause the problem?


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