Crash on CallWindowProcW when entering Play mode for the second time and running the Editor in the background while using System.Windows.Forms functions

Unity: Mono

Won't Fix

6.5.X

6.4.X

6.3.X

6.0.X

Thank you for reporting a bug to Unity. We don't support the use of System.Windows.Forms in Unity. While it may be possible that there is some way for this to work; it is not something we plan on supporting. Today we will be closing this case. Thank you again for taking the time to report this issue, and please let us know if there is anything else that changes the impact or severity of this issue.

How to reproduce:
1. Open the attached “IN-132970” project
2. Open the “GameScene“
3. Enter, then exit Play mode
4. Enter Play mode once again
5. Open any other program (for example Notepad or any IDE)
6. Observe the crash

Reproducible with: 6000.0.0b16, 6000.0.68f1, 6000.3.10f1, 6000.4.0b10, 6000.5.0a7
Could not test with: 6000.0.0b15 (couldn't solve errors from downgrading)

Reproduced on: Windows 11
Not reproduced on: No other environment tested

First few lines of the stack trace:
0x00007FFC1AB56B46 (USER32) CallWindowProcW
0x00007FFC1AB563CC (USER32) SendMessageW
0x00007FFC1AB87FC3 (USER32) GetWindowDpiAwarenessContext
0x00007FFC1CDC5A74 (ntdll) KiUserCallbackDispatcher
0x00007FFC1A9112C4 (win32u) NtUserPeekMessage

Crash on CallWindowProcW when entering Play mode for the second time and running the Editor in the background while using System.Windows.Forms functions

Unity: Mono

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

Crash on CallWindowProcW when entering Play mode for the second time and running the Editor in the background while using System.Windows.Forms functions

Unity: Mono

Statuses

Won't Fix

Resolution Notes

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?