A Question about an activity done by OnTimer()

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Hello, i have a question about OnTimer() function in Visual C++ 6.0. My program contais 2 classes - let's say a class A and a class B . Class A calls me a screen and the user must choose an option(e.g. Start or something). When the user clicks on START it calls me class B. I'm doing that using DoModal().
In class B i'm using OnTimer() to make moving objects(e.g. ellipses). If i press Esc key it calls me A class back. If i do this process several times(from A class to B and from B to A) i notice that in B class the moving objects start to lag(the falling speed decreases - bug or something). I'm asking for your opinion and solution if you have that. Thanks in advance!

Posted 15-Feb-10 4:09am

George Findulov

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Eugen Podsypalnikov · Answer 1 · 2010-02-15T04:16:00

Solution 1

Who and where
does start and kill the timer ? :)

Posted 15-Feb-10 4:16am

Eugen Podsypalnikov

Eugen Podsypalnikov · Answer 2 · 2010-02-15T04:56:00

Your technique is just a thriller... :)

You can begin the analysis
trying to remember and kill the last timer
in the B::OnDestroy() function...

Secondly,
think that the handling of WM_TIMER
has its place in the main thread only,
so you could take the same theoretic effect
with a singly timer too... :)

George Findulov · Answer 3 · 2010-02-15T04:22:00

Like i said i have a lot of falling stuffs and i'm using different timers. The first timer: SetTimer(1, 100, NULL) starts in OnInitDialog();
Then in OnTimer I make a check and kill the timer and set a new one. I do it in a loop

for(int i=1; i<=100; i++)
{
if(y[i]>500)
{
KillTimer(i);
SetTimer(i+1, 100, NULL);
}
}

A Question about an activity done by OnTimer()

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