C / C++ / MFC

How to detect screen saver

18-Dec-05 12:23

SetDlgItemText(m_hWnd, nID, ...
SetDlgItemText(GetSafeHwnd(), nID, ...
SetDlgItemText(*this, nID, ...
SetDlgItemText(nID, ...

The last one is CDialog's (actually CWnd's) wrapper for SetDlgItemText.

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Re: Get window handle?

Lord Kixdemp18-Dec-05 13:47

Lord Kixdemp

18-Dec-05 13:47

Hmm? None worked... Hmmm | :|

SetDlgItemText(m_hWnd, nID, ...
m_hWnd doesn't exist...

SetDlgItemText(GetSafeHwnd(), nID, ...
GetSafeHwnd() neither... I looked it up and it came out to be a member of CWnd, but it's not static... Unsure | :~

SetDlgItemText(*this, nID, ...
error C2664: 'SetDlgItemTextA' : cannot convert parameter 1 from 'CMazzeeMapGrouperApp' to 'HWND'

SetDlgItemText(nID, ...
Doesn't exist either... Frown | :(

Do you know of another way? Thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

Re: Get window handle?

Lord Kixdemp18-Dec-05 16:36

Lord Kixdemp

18-Dec-05 16:36

Nevermind... I was putting my event handler somewhere else... Blush | :O

Sorry, and thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

PJ Arends18-Dec-05 12:00

Re: How to detect screen saver

18-Dec-05 12:00

I have an app which always runs in the background (main window is hidden) and it's only visible cue to the user is an animated icon on the task bar. The icon is animated when the app is actively polling for information, and static when the app is running but no polling is taking place. Now according to the task manager my app is running the CPU at about 20% just to animate the icon. This is not so bad when the user is sitting at the computer but the app is designed to run 24/7 so I would really like to be able to stop the animated icon when the user is not there to see it (screen saver starting and or monitor turning off) and start it again when the user is there (screen saver stops and/or monitor turns on).

Is there a way to detect the screen saver starting and stopping or the monitor turning off and on from an app that is not the currently active app? WM_SYSCOMMAND with SC_SCREENSAVE is only recognized by the active app when the screen saver starts, not when it stops.

Owner drawn18-Dec-05 18:21

Owner drawn

18-Dec-05 18:21

SystemParametersInfo(SPI_GETSCREENSAVERRUNNING,...);

Take a look at these too...

1. SPI_GETSCREENSAVEACTIVE
2. SPI_GETSCREENSAVETIMEOUT
3. SPI_SETSCREENSAVEACTIVE
4. SPI_SETSCREENSAVETIMEOUT

could be useful.

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Re: How to detect screen saver

PJ Arends18-Dec-05 20:42

Memory assertion with std::vector ..

18-Dec-05 20:42

Thanks, I will look at those. I was hoping that there was some message that would be posted to my app so that I would not have to poll those settings myself, but I think these will work.

selecta18-Dec-05 8:49

18-Dec-05 8:49

Hello,

I don't know what is wrong with my code. I got assertion of memory. Thank you very much for your help Smile | :)

In example.h

<br />
typedef MyType struct<br />
      { int one; int two};<br />
<br />

In my example.cpp:

<br />
void main(void)<br />
{<br />
  std::vector<<MyType>> toto;<br />
  toto.reserve(10);<br />
  PlayWithToto(&toto);   // here i 've got no assertion messages<br />
  toto.clear();<br />
<br />
}  <= here I've got an assertion ! (even if I don't call toto.clear()<br />
void PlayWithToto(std::vector<<MyType>> *titi)<br />
{<br />
   MyType temp;<br />
   temp.one = 1;<br />
   temp.two = 2;<br />
<br />
   titi->push_back(temp);<br />
}

-- modified at 14:53 Sunday 18th December, 2005

Jörgen Sigvardsson18-Dec-05 8:56

18-Dec-05 8:56

Well.. what is the assertion?

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selecta18-Dec-05 10:25

18-Dec-05 10:25

Hello,

I've got a message box : exeption ... (in french : non gérée)

And the debugger stop in dbgrpt.c code :

#undef _CrtDbgBreak<br />
<br />
_CRTIMP void _cdecl _CrtDbgBreak(<br />
        void<br />
        )<br />
{<br />
        DebugBreak();<br />
}<= THE DEBOGGER STOP HERE<br />

When I click F5, the debogger stop at :

<br />
CWnd* PASCAL CWnd::FromHandlePermanent(HWND hWnd)<br />
{<br />
	CHandleMap* pMap = afxMapHWND();<br />
	CWnd* pWnd = NULL;<br />
	if (pMap != NULL)<br />
	{<br />
		// only look in the permanent map - does no allocations<br />
		pWnd = (CWnd*)pMap->LookupPermanent(hWnd);<br />
		ASSERT(pWnd == NULL || pWnd->m_hWnd == hWnd);  <= HERE<br />
	}<br />
	return pWnd;<br />
}<br />

Thanks you Smile | :)

Jörgen Sigvardsson18-Dec-05 10:29

18-Dec-05 10:29

If you look at the callstack, please navigate to the call frame just before _CrtDbgBreak(). _CrtDbgBreak() is just the function that invokes the debugger.

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selecta18-Dec-05 11:03

18-Dec-05 11:03

Hello,

Before the call to _crtDgbBreak() I've got this in the callstack :

msvcr71d.dll!_CrtDbgReport(int nRptType=2, const char * szFile=0x7c144c68, int nLine=323, const char * szModule=0x00000000, const char * szFormat=0x00000000, ...)

mfc71d.dll!AfxAssertFailedLine(const char * lpszFileName=0x7c144c68, int nLine=323)

mfc71d.dll!CWnd::FromHandlePermanent(HWND__ * hWnd=0x0026061a)

mfc71d.dll!AfxWndProc(HWND__ * hWnd=0x0026061a, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)

mfc71d.dll!AfxWndProcBase(HWND__ * hWnd=0x0026061a, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)

There is no call to a specific function in my code... only calls to AfxWnd...

Thanks you for your help Smile | :)

Jörgen Sigvardsson18-Dec-05 11:15

18-Dec-05 11:15

I'm not sure what has happened. It is clearly unrelated to your code. What type of project is it? MFC? You should create a console project, judging by the code you have shown us. Smile | :)

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selecta18-Dec-05 11:23

18-Dec-05 11:23

Hi ;

I'm sorry to have bother you... I just create a simply CDialog with only this code and I've got no assertion... So there is something in my app that bug somewhere...

Thank you very much for your help !!

Jörgen Sigvardsson18-Dec-05 11:30

18-Dec-05 11:30

I suspect that you have created an MFC project, and added the main() function. MFC apps aren't supposed to work with a main() function. If you test the code with a clean console project, you will have no bugs.

I see no apparent bugs in your code.

--
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PJ Arends18-Dec-05 12:17

18-Dec-05 12:17

selecta wrote:
HWND__ * hWnd=0x0026061a, unsigned int nMsg=15

nMsg=15 is WM_PAINT.

Your app is trying to send a WM_PAINT message to window 0x0026061a but MFC is not able to find that window in its map of window handles (via pMap->LookupPermanent) so it has no idea where to send the message.

selecta18-Dec-05 13:24