How to use C# hide all visible windows in windows.

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I use basically nethod showwindow(hwnd,0) to hide all visible windows,but however,some windows in spy++ such as tskmgr and regedit still in appearance.Is there some method else i should try？For example,Once i run the code below,window spy++ still insists on screen.

What I have tried:

C#

EnumWindows((hw, lPara) =>
{
    if (IsWindowVisible(hw) == true)
    {
        ShowWindow(hw, 0);
    }
    return true;
}, IntPtr.Zero);

Posted 4-Jan-24 19:59pm

Qing Lucking

Updated 4-Jan-24 21:53pm

Richard Deeming

v2

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PIEBALDconsult 5-Jan-24 9:51am

Is that what your users want?

Qing Lucking 5-Jan-24 10:31am

Pardon,no user but i,Ijust wanna implement that case that all visible windows go disappeared shows no icons, bars except the wallpaper on screen.BUT some inner windows can't hide by func showwindow(hw,0)

PIEBALDconsult 5-Jan-24 10:32am

Maybe you want to run in kiosk mode?

Qing Lucking 5-Jan-24 10:36am

No none,no such a difficulty.just C# to make windows dies out and show wallpaper alone

[no name] 5-Jan-24 15:18pm

https://stackoverflow.com/questions/33781788/how-to-get-hidden-windows-handle-of-the-windows-that-show-hidden-system-tray-ico

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Richard MacCutchan · Accepted Answer · 2024-01-04T22:16:00

Solution 1

See the note below the Remarks section at EnumWindows function (winuser.h) - Win32 apps | Microsoft Learn[^].

Posted 4-Jan-24 22:16pm

Richard MacCutchan

Comments

Qing Lucking 5-Jan-24 7:47am

very funny

Richard MacCutchan 5-Jan-24 8:21am

It was a serious point. But perhaps you did not bother reading it.

Qing Lucking 5-Jan-24 10:11am

Whatever,thanks for help.But I had read that func parameters meaning over several times.Perhaps it provide no solution for what i asked.Some windows inner couldn't receive the Showwindow commands to show them hidden

Richard MacCutchan 5-Jan-24 10:34am

It's quite possible that some Windows do not respond to such requests as thay are effectively system processes.

Qing Lucking 5-Jan-24 10:41am

That was troublesome.I don't know how windows paint and refresh and why some system process windows really stabbon on screen

Richard MacCutchan 5-Jan-24 11:32am

I expect the only people who do know are the Windows developers themselves. You could always post your question on the Microsoft support forum.

Qing Lucking 6-Jan-24 4:52am

get a point

Maxim Kartavenkov · Accepted Answer · 2024-01-08T23:42:00

In additional to previous solution and notes of EnumWindows I want to point that if you running code as particular user and the application which is owning window you want to hide as admin then the function ShowWindow will fail.
Also from the user perspective hiding windows of the application which is not started from your process or not related to your application is very bad design. If you doing that with your own applications then it is better to use RegisterWindowMessage and any of message sending functions such as BroadcastSystemMessage, SendMessageCallback or similar. It is also possible to use named notification events as the hiding signal.

Regards,
Maxim.