After clicking "Copy" in UPS variables the UI crashes

[codiflow]

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• Completed below form
• Attached debug log file
• Copy output in File -> UPS Variable

WinNUT Version: v2.3.8988
Windows OS Version: Windows Server 2016 Essentials Build 14393

Describe the bug
After I click on "Copy" in UPS variables the UI crashes with the error message System.Runtime.InteropServices.ExternalException (0x800401D0): Der angeforderte Clipboard-Vorgang war nicht erfolgreich.. Full error log at the end of this issue.

The path mentioned in this error looks wrong (no user Glen on this machine):
C:\Users\Glen\Repositories\nutdotnet\WinNUT-Client\WinNUT_V2\WinNUT-Client\List_Var_Gui.vb

To Reproduce
Steps to reproduce the behavior:

1. Click on UPS variables
2. Click on Copy
3. Crash (Error message appears)
4. If I click on the X in the upper right corner the UI vanishes but the process is still running in the background. Need to shoot it with the task manager to be able to start the UI again.

Expected behavior
The UPS variable content should be copied to the clipboard.

Screenshots

Additional context
Error message:

System.Runtime.InteropServices.ExternalException (0x800401D0): Der angeforderte Clipboard-Vorgang war nicht erfolgreich.
   bei System.Windows.Forms.Clipboard.ThrowIfFailed(Int32 hr)
   bei System.Windows.Forms.Clipboard.SetDataObject(Object data, Boolean copy, Int32 retryTimes, Int32 retryDelay)
   bei System.Windows.Forms.Clipboard.SetText(String text, TextDataFormat format)
   bei System.Windows.Forms.Clipboard.SetText(String text)
   bei WinNUT_Client.List_Var_Gui.Btn_Clip_Click(Object sender, EventArgs e) in C:\Users\Glen\Repositories\nutdotnet\WinNUT-Client\WinNUT_V2\WinNUT-Client\List_Var_Gui.vb:Zeile 158.
   bei System.Windows.Forms.Control.OnClick(EventArgs e)
   bei System.Windows.Forms.Button.OnClick(EventArgs e)
   bei System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei System.Windows.Forms.ButtonBase.WndProc(Message& m)
   bei System.Windows.Forms.Button.WndProc(Message& m)
   bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[gbakeman]

Hi @codiflow ,

Sorry I missed this post way back when. It looks like a non-specific error message, possibly indicating another app is using the clipboard. Leaving this link for myself when I come back to this. Any ideas what other applications might be using your clipboard?

[codiflow]

Hi @gbakeman ,
thanks for answering and no problem with the delay. Your finding can indeed be the cause. I used remote control (I think it was RustDesk at this time) to access the machine and this could indeed have been blocking the clipboard.

So maybe this is only a bug in remote control scenarios?

[gbakeman]

That probably makes sense as the culprit, although to be honest I have little understanding of how the clipboard works so it's surprising to me that it couldn't be written to. This could definitely be handled better though. The SO question seemed to have some good answers, and there should probably be a save to disk button as an alternative. Do you think that might be helpful? Either way I hope to get back to this bug and fix. Thanks again for your patience and responsiveness.

[codiflow]

Do you think that might be helpful?

Sure. I think its sufficient to have at least one way which works to copy and paste the tree structure.

Thanks for your will to fix this 🙏

[gbakeman]

Thanks again for your patience. I just sent up a PR that includes a fix for this issue, among other changes. Would you please give the build a try and report back when you get a chance?
e: I want to add that it may not fix the root issue of being able to copy data to the clipboard, but at least the error should be handled now and the option to save to a file is available now too.