mfc, Why I couldn't SetTimer in ListView

microsoft.public.vc.mfc - Microsoft Visual C


mfc >> Why I couldn't SetTimer in ListView

by WWVKaWFuV2Vp » Mon, 24 Jan 2005 11:05:01 GMT

I create new SDI project by AppWizard, at the final stage I modify the view
class from CView to CListview.
Everything is fine before I try to set a Timer in the ListView.
I simply call CWnd::SetTimer to start a timer, then use classwizard to
generate code to process WM_TIMER message
Here comes the code:
void CListView::OnTimer(UINT nIDEvent)
{
if (nIDEvent == 1)
{
....
}
CListView::OnTimer(nIDEvent);
}

But the I found the message WM_TIMER is been delivered only once,
then there are no more WM_TIMER after the first call to CListView::OnTimer.
I am totally puzzled, could anybody help me?

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mfc >> Why I couldn't SetTimer in ListView

by Doug Harrison [MVP] » Mon, 24 Jan 2005 11:23:25 GMT






Assuming the "..." part isn't killing the timer, and the CListView::OnTimer
call is executed, I'd suspect that the latter is killing the timer. In
general, there's no need to call the base class OnTimer for timers created
in the derived class, and while you're diligently checking nIDEvent, there's
no guarantee the listview control itself does. In fact, listview creates a
couple of undocumented timers to manage the in-place edit controls it
creates; IIRC, they have IDs 42 and 43. So it definitely handles WM_TIMER,
but it may not be as diligent as you are in distinguishing its timers from
those created by subclasses.

I'd suggest trying:

if (nIDEvent == 1)
{
....
}
else
CListView::OnTimer(nIDEvent);

--
Doug Harrison
Microsoft MVP - Visual C++


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mfc >> Why I couldn't SetTimer in ListView

by Jiangsheng[MVP/VC] » Mon, 24 Jan 2005 12:20:56 GMT

see KB Q200054 PRB: OnTimer() Is Not Called Repeatedly for a List Control


"Doug Harrison [MVP]" < XXXX@XXXXX.COM > : XXXX@XXXXX.COM ...




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Why I couldn't SetTimer in ListView

by Doug Harrison [MVP] » Mon, 24 Jan 2005 12:44:09 GMT





I'm glad to see it's documented, but not so glad to see this misbehavior is
"by design". I knew this problem sounded familiar. Searching my own source
code, I found this (partial) comment:

// messages. Moreover, listview kills my timer when I call the base class
// version. I suppose I shouldn't have done that, but there's no excuse for
// listview to kill timers it didn't create.

Have you run across any documentation for the timer IDs listview uses? I
discovered the IDs for myself by using Spy++, but they really ought to be
documented.

--
Doug Harrison
Microsoft MVP - Visual C++

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Why I couldn't SetTimer in ListView

by WWVKaWFuV2Vp » Mon, 24 Jan 2005 12:59:01 GMT

Thank you all, I had seen this KB and confirm it.





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Why I couldn't SetTimer in ListView

by Alexander Grigoriev » Tue, 25 Jan 2005 12:14:52 GMT

Since the ID has the same width as the memory address, I suggest to use
either CWnd pointer for it, or an address of some data member.







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Why I couldn't SetTimer in ListView

by Doug Harrison [MVP] » Wed, 26 Jan 2005 00:37:04 GMT





Not foolproof, but still a pretty nice idea. It has these desirable
properties:

1. It avoids small IDs, such as listview's magic 42 and 43, so won't
conflict with common practice.
2. As long as everyone uses the address of his own variable, people using
this method won't collide with one another.

--
Doug Harrison
Microsoft MVP - Visual C++

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