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Asking for PWD at maximize?

Posted on 2000-05-05
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Last Modified: 2013-11-20
Hello,
I want to develop an app. that should ask for a password when it is being maximized (like CCMail), I would really appreciate if I can put password while getting focus too i.e, while repainting.
Thanx in advance.
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Question by:Moin
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7 Comments
 
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Expert Comment

by:ShaunWilde
ID: 2779887
do you mean maximized (full screen) or restored ?

either way you may want to look at overriding OnActivate(...) or OnActivateApp(...) (WM_ACTVATE or WM_ACTIVATEAPP respectively)
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LVL 1

Expert Comment

by:tomkeane
ID: 2782201
Add a handler for WM_WINDOWPOSCHANGING - before the window is resized you'll get this message with a WINDOWPOS structure as an argument.

You can check the flags in the WINDOWPOS argument to see if the window is about to be maximized (or restored) and prompt the user for the password.

If the password is not entered correctly, you can modify the flags in the WINDOWPOS structure to prevent the window from being maximized/restored.

Hope this helps-

Tom
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Author Comment

by:Moin
ID: 2791526
How will I add a handler to "WM_WINDOWPOSCHANGING", because I couldn';t find it anywhere in the MFC  classwizard dialog?
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LVL 9

Expert Comment

by:ShaunWilde
ID: 2791662
you will need to change your filter in the class info tab to 'window' for the class that you wish to add this handler to
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LVL 1

Expert Comment

by:tomkeane
ID: 2791700
You could also add it manually (which  is not a bad thing to learn to do anyway...)

Add the following to your header file:
afx_msg void OnWindowPosChanging( WINDOWPOS* lpwndpos );

Add:
  ON_WM_WINDOWPOSCHANGING()
to your message map

and add the function to your class:

void YourClass::OnWindowPosChanging( WINDOWPOS* lpwndpos )
{

}

Tom
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Author Comment

by:Moin
ID: 2795631
How is the WINDOWPOS struct showing the state of Window, i.e., maximized or minimized
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Accepted Solution

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tomkeane earned 100 total points
ID: 2795800
I read your question again and had another idea.  Handle WM_SYSCOMMAND - the following code will fire whenver the window is minimized before it gets restored.  In place the MessageBox, you would place your password dialog.

void CMainFrame::OnSysCommand(UINT nID, LPARAM lParam)
{
  if (IsIconic() && 
    (nID == SC_RESTORE ||
     nID == SC_ZOOM ||
     nID == SC_MAXIMIZE))
  {
    if (MessageBox( "Allow to restore?", "MyApp", MB_OKCANCEL ) != IDOK)
    {
      return;
    }
  }
      
CFrameWnd::OnSysCommand(nID, lParam);
}
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