How to get peekatdesktop is enabled/disabled in C#

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Dear All,

I'm trying to detect the PeekAtDeskTop is enabled/disabled.

What I have tried:

C#

public enum WindowsPeekAtDesktop
{
        Enabled = 1,
        Disabled = 0,
}

[DllImport("dwmapi.dll", PreserveSig = false)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool DwmIsCompositionEnabled();

public static WindowsPeekAtDesktop IsPeekAtDesktop()
{
            // Tried using RegistryKey
            //RegistryKey AeroPeek = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\DWM", true);
            //var abc = AeroPeek.GetValue("EnableAeroPeek");
            //var aa = DwmWindowAttribute.DWMWA_EXCLUDED_FROM_PEEK;


            if (Environment.OSVersion.Version.Major >= 6 && DwmIsCompositionEnabled())
                return WindowsPeekAtDesktop.Enabled;
            
            return WindowsPeekAtDesktop.Disabled;
}

If I enabled/disabled peekatdesktop the DwmIsCompositionEnabled() and RegistryKey is always returning true.

Can anyone please help me. How to detect PeekAtDesktop is enabled/disabled.

Thanks in advance

Posted 31-Dec-19 23:50pm

abdul subhan mohammed

Updated 1-Jan-20 0:59am

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Comments

[no name] 1-Jan-20 9:37am

Check this for the correct signature: pinvoke.net: dwmiscompositionenabled (dwmapi)[^]

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2020-01-01T00:59:00

Solution 1

Your code is not correct, the function requires an out parameter (see pinvoke.net: dwmiscompositionenabled (dwmapi)[^] ) that gets the setting. If the function succeeds, whichever value is set, it will always return true. See DwmIsCompositionEnabled function (dwmapi.h) - Win32 apps | Microsoft Docs[^] for full details.

[edit]
Added P/Invoke signature thanks to 0X01AA
[/edit]

Posted 1-Jan-20 0:59am

Richard MacCutchan

Updated 1-Jan-20 4:03am

v2

Comments

[no name] 1-Jan-20 9:58am

This sould help for the signature: https://www.pinvoke.net/default.aspx/dwmapi.dwmiscompositionenabled

Richard MacCutchan 1-Jan-20 10:04am

Thanks, added to Solution with acknowledgement.

abdul subhan mohammed 2-Jan-20 1:03am

//Peek at desktop
        [DllImport("dwmapi.dll")]
        public static extern int DwmIsCompositionEnabled(out bool enabled);

        public static bool AeroEnabled()
        {
            if (Environment.OSVersion.Version.Major < 6)
                return false;

            bool result;
            DwmIsCompositionEnabled(out result);

            return result;
        }

        public static WindowsPeekAtDesktop IsPeekAtDesktop()
        {            
            return AeroEnabled() ? WindowsPeekAtDesktop.Enable : WindowsPeekAtDesktop.Disable;
        }

I tried the above code but still always its return true eventhough the PeekAtDesktop is disabled.

Please help me.

Richard MacCutchan 2-Jan-20 3:51am

As stated in the documentation:
Quote: Note As of Windows 8, DWM composition is always enabled.

abdul subhan mohammed 7-Jan-20 2:15am

I tried to win 10 as well, but still, the result always returning true.

Richard MacCutchan 7-Jan-20 3:35am

Exactly, as stated in my previous comment. All versions of Windows now show DWM as true.

How to get peekatdesktop is enabled/disabled in C#

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How to get peekatdesktop is enabled/disabled in C#

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