Screen Saver Base Class


In Window95 a screen saver can be previewed in display property dialog . How can the application knows whether it runs in full screen mode or in the preview mode . If the the first parameter is 'c' you need to run config . if it is 'p' you need to create a preview window . If it is 's' you need to create full screen window .

I write the three base class which are for the common usage .
  1. One is derived from CWinApp , it(CSSApp) will judge whether runs in full screen mode or in preview mode and call the proper member function to start task .
  2. The other two are derived from CWnd , one(CFullWnd) is full screen window the other(CSmallWnd) is preview window.

There are some virtual member function in the CSSApp .

  1. InitInstance(...) It will judge the running mode and call the proper function (DoConfig, DoSmall or DoFull) .Your class derived from CSSApp must call it in InitInstance .
  2. DoConfig(...) You must override it to display your configuration dialog .
  3. DoSmall(...) You must override it to create your preview mode window . You need create a child whose parent window is CWnd* pParent = CWnd::FromHandle((HWND)atol(__argv[2])) .
  4. DoFull(...) You must override it to display the full screen window .

The class CFullWnd and CSmallWnd can be the base class of your full screen window class and preview window class . When the window is created it will generate a timer . The thing you need to do is overriding the OnTimer(...) function .

Download demo project - 177 KB

Download source - 27 KB


  • Black Background

    Posted by Legacy on 01/14/1999 12:00am

    Originally posted by: Frank Meffert

    I'm using NT4 with IE 4.01.

    In the code, member variable m_brBk is set to NULL (meaning it should be Transparent).

    In preview mode the Screen Saver works as it should (icons/windows/etc. stay visible), but when it actually gets activated with the Screen Saver timer), my desktop icons and windows disappear and only my desktop bitmap is shown. Anything I need to know about how to make the entire desktop (with icons and windows) stay visible?

    Anyone have a clue? I don't think I should have to capture the screen and re-paint it as a fake window or anything like that...

  • screen saver parameters page

    Posted by Legacy on 01/07/1999 12:00am

    Originally posted by: Thierry Maurel

    When I try to open the parameters dialog of the screen saver, from the screen property, it doesn't appear.
    There is a little flickering (the main property page losts and gets the focus).
    Is it a referenced problem for MFC screen savers ?
    I use NT4.

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