Timer in visual studio mfc C++

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I must use a timer that calls the function every 10 seconds, I searched on goole but I don't find a correct example..dou you have some examples?

I read solutions but my application use CDocument class, so WM_TIMER event isn't recognized and SetTimer idem..

What I have tried:

I searched on internet but there isn't a clear example

Posted 26-May-23 4:07am

Member 14594285

Updated 28-May-23 22:59pm

v2

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2 solutions

Solution 1

You need to use the SetTimer function (winuser.h) - Win32 apps | Microsoft Learn[^] and associated messages.

Posted 26-May-23 4:11am

Richard MacCutchan

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Member 14594285 26-May-23 10:47am

I wrote:

m_nTimer = SetTimer(IDT_TIMER, 1000, NULL);

but I I have error in SetTimer

Richard MacCutchan 26-May-23 11:26am

What error?

Member 14594285 26-May-23 11:37am

I have an error inside the function SetTimer, elements are not recognized

Richard MacCutchan 26-May-23 12:27pm

Then you need tob change them so that they are recognised.

Seriously, how do you expect us to help you if you do not provide any useful information? Please use the Improve question link above, and add complete details of the code you have and the exact error messages.

Member 14594285 29-May-23 5:03am

I improved question

Richard MacCutchan 29-May-23 6:21am

OK, so why are you trying to use a timer inside a class that does not support it? Rick York already gave you the correct details in his solution above, and you can see the full details at CWnd Class | Microsoft Learn[^].

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Rick York · Accepted Answer · 2023-05-26T05:04:00

Call SetTimer, as you did, then you have to implement an OnTimer override in your window class that will handle the timer event. This is its prototype :

C++

afx_msg void   OnTimer( UINT_PTR id );

You also have to add this line to your message map :

C++

ON_WM_TIMER()

Remember that there can be several timers active at once so you should only service the event of interest in your handler - not all of them. That means your handler should look something like this :

C++

void MyWindowClass::OnTimer( UINT_PTR timertId )
{
   if( timerId == MyTimerId )
   {
      // handle timer event
   }
   __super::OnTimer( eventId );  // let parent class have its shot at it
}