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Editorial Team
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Asked: 2026-05-16T10:04:49+00:00

I did a notifier app in C# that sits on the taskbar and display

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I did a notifier app in C# that sits on the taskbar and display a balloon when I get something from it, similar to Google Talk when you receive a new email but at the momment it ignores if I am running an application on fullscreen or not and just do it is job.

How can I detect and make sure an application is in fullscreen mode? I don’t mean maximized (as an app could be maximized on your screen but still not in fullscreen) mode but true fullscreen.

For example when you run a game most will run in fullscreen mode.

Initially GetForegroundWindow() and GetWindowRect() came to my mind but even so I could make a window go larger then my screen if I am not on fullscreen which wouldn’t help me so I am wondering if there are other flags or ways to approach this?

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1 Answer

  1. Editorial Team

    For PowerPoint, see this MS KB article here:
    http://support.microsoft.com/kb/913045

    Screen Saver: Windows API: FindWindow(“WindowsScreenSaverClass”).
    (For more details see this web article: http://bobmoore.mvps.org/Win32/w32tip22.htm – it has a more detailsd way to do it, but I think FindWindow will work ok for you)

    For detecting if a full screen game is in use: IDirect3DDevice9::TestCooperativeLevel
    http://msdn.microsoft.com/en-us/library/bb174472(VS.85).aspx

    Otherwise, I think you are on the right path with GetForegroundWindow, GetWindowRect, and other window positioning api.

    Things get complicated with you have more than one monitor – so don’t forget that scenario as it relates to your app.

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