Using Timer with non-dialog class
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Hello, I have a class that doesn't connect to a dialog or window and I need to do some operations on timer but the timers works only with dialogs , does anyone know another way I do it? thank
You can have a thread running the Sleep API. After a specified interval of time it becomes active, performs it's task and sleep's again for the specified duration. That is somewhat similar to what a timer does.
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Hello, I have a class that doesn't connect to a dialog or window and I need to do some operations on timer but the timers works only with dialogs , does anyone know another way I do it? thank
Just use the win 32 set timer method: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644906(v=vs.85).aspx[^] Dont forget, MFC just wraps the Win32 API, and even then not all of it (there is a lot of rich unctionality there not available in MFC), and pretty much all MFC functions have a function of the same name in the win32API. Most of these win32 funcs take a window handle as the first param, and thats generally the only difference between them, and their MFC counterpart, since the MFC one generally calls itself. So for example the win32 MessageBox() func has a HWND as the first partam, then all the rest are the same as MFC. You can also call the win32API directly form MFC code. Just use the global namespce operator :: before each call ie: ::MessageBox(hWnd, txt, msg, MB_OK); You can get window handles for other processes/wondows easilly too. FindWindow() returns a HWND. Its params are eityher the class of the window, or its text (in the title bar). You can use this to send or post messages, such as WM_COMMAND ones to another window. Like I say, there is a lot you can do outside of MFC. (Window hooks are particularly interesting things. Very very powerfull.) :)
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You can have a thread running the Sleep API. After a specified interval of time it becomes active, performs it's task and sleep's again for the specified duration. That is somewhat similar to what a timer does.
You talk about Being HUMAN. I have it in my name AnsHUMAN
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Just use the win 32 set timer method: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644906(v=vs.85).aspx[^] Dont forget, MFC just wraps the Win32 API, and even then not all of it (there is a lot of rich unctionality there not available in MFC), and pretty much all MFC functions have a function of the same name in the win32API. Most of these win32 funcs take a window handle as the first param, and thats generally the only difference between them, and their MFC counterpart, since the MFC one generally calls itself. So for example the win32 MessageBox() func has a HWND as the first partam, then all the rest are the same as MFC. You can also call the win32API directly form MFC code. Just use the global namespce operator :: before each call ie: ::MessageBox(hWnd, txt, msg, MB_OK); You can get window handles for other processes/wondows easilly too. FindWindow() returns a HWND. Its params are eityher the class of the window, or its text (in the title bar). You can use this to send or post messages, such as WM_COMMAND ones to another window. Like I say, there is a lot you can do outside of MFC. (Window hooks are particularly interesting things. Very very powerfull.) :)
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Thanks a lot, As I understand I need to use SetTimer() and to give it an handle to window but the class is not connected to a dialog so what the hWnd that I need to pass?
Timers have nothing to do with dialogs, they operate on any Window. The issue of passing a handle to the window is so that the Windows framework knows where to post the
WM_TIMERmessage that gets raised when the timer expires. If you do not have a Window to connect the timer to then SetWaitableTimer()[^] may be able to help you.Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman
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Thanks a lot, As I understand I need to use SetTimer() and to give it an handle to window but the class is not connected to a dialog so what the hWnd that I need to pass?
aangerma wrote:
so what the hWnd that I need to pass?
The one to your dialog/app window that handles WM_TIMER. As suggested you can get this handle with a FindWindow() specifying the title text. Or you can provide it form the fialog itself, I forget the func, something like GetSafeHwnd() or some such, but there is one for a dialog to get its own handle. Like I say, hunt through the win32 API. You will find what you need there.
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Hello, I have a class that doesn't connect to a dialog or window and I need to do some operations on timer but the timers works only with dialogs , does anyone know another way I do it? thank
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Thanks for the answer, But the operations that I need to perform on the timer shuld have an approach to the data members and member Functions of the class , can I do it with threads?
No, not thread safe at all.
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No, not thread safe at all.
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Hello, I have a class that doesn't connect to a dialog or window and I need to do some operations on timer but the timers works only with dialogs , does anyone know another way I do it? thank
SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.
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SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.
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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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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 ].
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SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.
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Now why didn't I think of that; good answer.
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SetTimer[^] has a fourth parameter, an application defined callback function. Use that and set the HWND to NULL.
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On reflection I decided to test this and it does not work without any windows, as there is nothing to process the
WM_TIMERmessage, which is used by the default handler to invoke the callback routine.Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman
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On reflection I decided to test this and it does not work without any windows, as there is nothing to process the
WM_TIMERmessage, which is used by the default handler to invoke the callback routine.Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman
I would be interested to see your test code. I have no problems using a timer callback procedure.
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On reflection I decided to test this and it does not work without any windows, as there is nothing to process the
WM_TIMERmessage, which is used by the default handler to invoke the callback routine.Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman
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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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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PJ Arends wrote:
the thread needs a message loop.
That's the issue; even with a callback the timer signals by posting a
WM_TIMERmessage.Unrequited desire is character building. OriginalGriff I'm sitting here giving you a standing ovation - Len Goodman
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Hello, I have a class that doesn't connect to a dialog or window and I need to do some operations on timer but the timers works only with dialogs , does anyone know another way I do it? thank
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.
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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.