AutoIt ObjCreate Throws Error After Upgrading .net 4.7.2 to .net 4.8

[dstrong]

I have been using AutoIt V3.3.14.5 calling a C# custom DLL to find the control names on WPF forms in a Windows 10 app that was targeted to .net 4.7.2.

This has worked flawlessly for many years.  We just rebuilt our Windows 10 app with Visual Studio 2019 and .net 4.8.  The attached sample code now errors out (80040154) with the ObjCreate call.

I have tried the .net 4.8 patch, signing the DLL, AutoIt V3.3.14.5 beta version and many other things without success.

When I uninstall .net 4.8 (KB448129) and reinstall .net 4.7.2 everything works again.

This is on Windows 10 Build 1607.

The Windows 10 app also has WinForms and they work with both .net versions.

It is only the WPF forms and .net 4.8 that don't work.

Are there any other things I can try?SimpleWPF.au3

[Earthshine]

Rebuild the DLL and target to 4.8

[Earthshine]

Also you don’t even need it you can use UIAutomation

[dstrong]

Thank you Earthshine, I rebuilt the DLL targeted to 4.8 but have the same results.

I will investigate using UIAutomation.

[Earthshine]

did anything else change in your application? did you add more stuff to it? Anyway, use this stuff

 

Using UI Automation Code in AutoIt - AutoIt Example Scripts - AutoIt Forums (autoitscript.com)

[Earthshine]

also if you want the dll to work, set up a dev vm, and install your product, then put source for the product and dll on the dev test vm. 

 

then you can debug your stuff in the debugger. this is the best way to get your dll fixed. debug it on a target with the source code. you probably don't need the app source but I would so you can walk through everything and see what exception is being thrown in the DLL method

also add logging to the DLL so you can easily debug using a log file. i do this with everything. makes it lots easier

Edited January 12, 2022 by Earthshine

[Earthshine]

oh and is .net 4.8 runtime installed on the test target?

[dstrong]

Yes, I have .net 4.8 runtime installed on the test system.

The main problem I have is with 4.8, the AutoIt ObjCreate call fails, but runs without error when I uninstall 4.8 and use 4.7.2.