Using Timer with non-dialog class

PJ Arends

SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.

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Lost User

He might find that difficult to specify a class member as a call back function. But yes, it is doable (and one of the reasons I prefer C, OK, you need to be a good programmer, but you can do what you want) :)

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Albert Holguin

Yeah but consider what he wants to do... if he's already using the WinAPI, might as well use the Win timers. Otherwise we'll have to answer a bunch of questions regarding mutexes next [joke ;P ].

Lost User

Now why didn't I think of that; good answer.

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Lost User

On reflection I decided to test this and it does not work without any windows, as there is nothing to process the WM_TIMER message, which is used by the default handler to invoke the callback routine.

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PJ Arends

I would be interested to see your test code. I have no problems using a timer callback procedure.

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PJ Arends

Looking at it further, the app does not need a window, but if there is no window then the thread needs a message loop.

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Lost User

PJ Arends wrote:

the thread needs a message loop.

That's the issue; even with a callback the timer signals by posting a WM_TIMER message.

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Chuck OToole

I have a few apps like that (mostly system services) so at the end of "main()" (or whatever you use), stick code like this:

 /\* Fall into the standard message processing loop \*/
 
 static MSG msg;
 while (GetMessage(&msg, NULL, 0, 0))		/\* wait for incoming message \*/
 {
	 TranslateMessage(&msg);		/\* translate it \*/
	 DispatchMessage(&msg);			/\* and let windows dispatch it to WinProc \*/
 }
 return(msg.wParam);				/\* done after "quit" message processed \*/

It doesn't hurt to sit in this loop while the other threads do their job and it allows them to post WM_CLOSE messages to run-down the process if necessary. Other standard messaging things works, including timers.

aangerma

Thanks for the reply, can you give me more details how to use it? How can I know which message I Received by msg?

Chuck OToole

This is the standard windows message pump, it only causes windows messages to get processed for apps that are not "dialog based". You don't modify this code in any way nor look at the message in that loop. The "dispatch" is done by windows to the proper messsage handler. If you have dialogs, windows does this for you.

aangerma

Can you give me exmple how to write a messsage handler , I did it only with the class wizard of mfc, and this is the first time I need to add a timer to a class that don't connected to any window, even if I creat a fictive window like dialog box the SetTimer(...) works only if the dialog is opened by DoModal. thanks