OnTimer function is killed automatically when the dialog is closed

[bjorn_ht]

Create a console app and put this code in to see how it works, then you can adapt "myOnTimer" and the call to ::SetTimer to your code.

#include <windows.h>
#include <iostream>

void CALLBACK myOnTimer(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD tickCount)
{
std::cout << "Timer. id = " << idEvent << ", tick = " << tickCount << std::endl;
}

int main(int argc, char * argv[])
{
MSG msg;

UINT_PTR timerId = ::SetTimer(0, 42, 1000, myOnTimer);

std::cout << "Timer set, id = " << timerId << std::endl;

// This is done by MFC in your application but needed for the example.
while(GetMessage(&msg, 0, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}

[shanmugarajaa]

But I am get error when i try to implement UINT_PTR timerId = ::SetTimer(0, 42, 1000, myOnTimer); in MFC VS6 ErrorReport:

'SetTimer' : cannot convert parameter 4 from 'void (struct HWND__ *,unsigned int,unsigned long,unsigned long)' to 'void (__stdcall *)(struct HWND__ *,unsigned int,unsigned int,unsigned long)'

[bjorn_ht]

I wrote that example for VS 2008, looks like the callback signature has changed a little since VS6. Try to change it to

void __stdcall myOnTimer(HWND hwnd, unsigned int uMsg, unsigned int idEvent, DWORD tickCount)
{
// ...
}

as the error message suggests. If you have an MSDN library with your VS then you should be able to find the correct callback function signature there. Maybe even an example.

[David Crow]

shanmugarajaa wrote:

how to create "TIMERPROC"..

It's in the docs: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644901(v=vs.85).aspx#creating_timer[^]

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[shanmugarajaa]

Thanks you so much.

[shanmugarajaa]

Hi code working good.. but I cant able to kill this timer... can you help to kill this call.. Regards, S.Shanmugaraja

[bjorn_ht]

You just call ::KillTimer(0, timerId); where timerId is the timer id value you got back from ::SetTimer.

[shanmugarajaa]

Thanks Thanks so much :)

[shanmugarajaa]

Hi, I am beginner to MFC application. I need your suggestion to improve my skill in MFC. How you come know about __stdcall and other functionality of MFC. Any material you have been using? kindly share your views and ideas. It may help me to improve my MFC skills. I am looking forward your valuable suggestion. Regards, S.Shanmugaraja

[shanmugarajaa]

Hi, I am Calling CapWatchID: = ::SetTimer(SetTimer(0, 42, 1000, CaptureStopWatchT); and after sometime I killed this running timer using ::KillTimer(0, CapWatchID);. But the problem is, when I start the same timer again then Updation time became lessthan 1000 millisecond. Why its happing like this. kindly help me to fix this problem. Regards, S.Shanmugaraja.

[bjorn_ht]

This is not MFC as such. SetTimer and KillTimer Windows system functions documented by Microsoft. http://msdn.microsoft.com/library/default.aspx[^] There are many good books and online resources on the subject of C++ programming, Windows system programming and MFC. I suggest you try searching the net for recommendations and book reviews.

[bjorn_ht]

I have not observed similar behavior so I'm afraid I can't help with that. Also please note that the number 42 as second parameter to SetTimer in my example was chosen randomly. Probably, it would be more correct in your context to use the value 0.