C / C++ / MFC

2-Nov-04 1:43

Hello,
I have a program that is in the tray and when a user logout, restart or shutdown I need to make a log when my program exit but I don't get it to work.
I have try with OnCancel(), OnOK() and OnClose() but it don't work.

So how can I make my stuf before my program exit?

Kapoor Vikrant2-Nov-04 1:59

Kapoor Vikrant

2-Nov-04 1:59

None of the given
Read from MSDN about WM_QUERYENDSESSION

Larsson2-Nov-04 2:02

2-Nov-04 2:02

I have check it but I don't get it,
Please help me.

Larsson2-Nov-04 2:23

2-Nov-04 2:23

I meen how can I make so when the program is about to exit it go first to a function and make some stuf?

RChin2-Nov-04 2:36

RChin

2-Nov-04 2:36

Override the ExitInstance function in your Application class. You can then clean up, or do whatever else before the application terminates.

I Dream of Absolute Zero

Larsson2-Nov-04 2:41

2-Nov-04 2:41

I have done that if you mean OnOK(), OnCancel() and OnClose().
Is there anyone else exit instance? and if so where?

RChin2-Nov-04 3:02

RChin

2-Nov-04 3:02

The OnOK(), OnCancel() and OnClose() functions are merly handlers for messages that gets sent when your button (I am assuming these are linked to a button) gets pressed. The previous poster mentioned creating a handler function for the WM_ENDSESSION message. This could be one possible solution to your problem.

My solution uses the fact that the WinApp::ExitInstance() function gets called whenever the user choses to exit their windows session.

Every MFC application should have a WinApp derived class, called something like MyProgApp, or something similar with the App appended to your class name.

Now this function isn't visible by default, so you need to override this function using the Classwizard (if using VS6), or the properties window (if using VS7.1).

You can then write your logging code within the function, but remember to call the base class at the end (or your app won't exit).

int CMyApp::ExitInstance() 
{
	// CLEANUP STUFF
	delete m_pVarA;
	delete m_pVarB;	
        ::CoUninitialize();

	return CWinApp::ExitInstance(); // base class
}

I Dream of Absolute Zero

GDavy2-Nov-04 2:46

GDavy

2-Nov-04 2:46

The system sends the message, so all you have to do is capture that message and then do your stuff.
( return FALSE after a WM_QUERYENDSESSION is received and then capture the WM_ENDSESSION and check if system is really shutting down and do your stuff before returning from this message...

Greetings,
Davy

Larsson2-Nov-04 2:49

2-Nov-04 2:49

Ok,
And where do I make that check?

Antony M Kancidrowski2-Nov-04 4:18

Antony M Kancidrowski

2-Nov-04 4:18

Something like this will help

Mainfrm header file

protected:
  afx_msg LRESULT OnMyEndSession(WPARAM wParam, LPARAM lParam);

Mainfrm cpp file

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
  :
 ON_MESSAGE(WM_ENDSESSION, OnMyEndSession)
  :
END_MESSAGE_MAP()

LRESULT CMainFrame::OnMyEndSession(WPARAM wParam, LPARAM lParam) 
{
  if (lParam & ENDSESSION_LOGOFF)
  {
    :
   // We are logging off
    :
  }
  else
  {
   // We are shutting down
  }
  return 0;
}

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Larsson2-Nov-04 4:51

Re: Wait for Data in pipe?

2-Nov-04 4:51

Thanks it works greate. Laugh | :laugh:

Wait for Data in pipe?

peterchen2-Nov-04 1:42

peterchen

2-Nov-04 1:42

Can I wait for Data to be available on a pipe? Peek & Poll works, but I'd rather have a true wait (since I'm waiting for "either data on pipe, or kill event")

we are here to help each other get through this thing, whatever it is Vonnegut jr.
boost your code || Fold With Us! || sighist | doxygen

Blake Miller2-Nov-04 7:54

Blake Miller

2-Nov-04 7:54

Yes, I found this in MSDN under "Synchronization Objects":

In some circumstances, you can also use a file, named pipe, or communications device as a synchronization object; however, their use for this purpose is discouraged. Instead, use asynchronous I/O and wait on the event object set in the OVERLAPPED structure. It is safer to use the event object because of the confusion that can occur when multiple simultaneous overlapped operations are performed on the same file, named pipe, or communications device. In this situation, there is no way to know which operation caused the object's state to be signaled.

How to calculate the Bandwidth of our computer

Anshul Mehra1-Nov-04 23:58

Anshul Mehra

1-Nov-04 23:58

Hello All,

Can some one tell me the Win32 API fn() or fn()'s used to calculate the bandwidth consumption of our computer. I am on NT platform and using VC++6.0 compiler.

Thnx in Advance

Comboy2080

Antony M Kancidrowski2-Nov-04 1:37

Antony M Kancidrowski

2-Nov-04 1:37

Do you mean Network Percentage Utilisation?

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Anshul Mehra2-Nov-04 3:20

Anshul Mehra

2-Nov-04 3:20

Can u plz tell me fn() which retrives packets sent and received information which is displayed in the Local Area Connection Setup (which is in the task bar in the right hand side corner).

Thnx in Advance

Comboy2080

Antony M Kancidrowski2-Nov-04 4:04

Antony M Kancidrowski

2-Nov-04 4:04

If you want to analyse packets to and from your PC take a look at WinPCap[^]

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Selvam R2-Nov-04 2:56

Selvam R

2-Nov-04 2:56

Hi,

the Win32 API fn() ??? No function avilable..