Windows 10: DwmRegisterThumbnail is not working as expected in the last windows update

Hello,

I developed program that make more than one API call to DwmRegisterThumbnail function from here:

https://docs.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmregisterthumbnail



Since update 1903, this function fail to work as expected when you try to do DwmRegisterThumbnail for the same window more than once.

My program create 2 thumbnails previews for the same window.



When it create the second thumbnail previews, the first thumbnail preview stop working and this is the problem. Only the last thumbnail preview works.



Again, the issue here it that you have for example some window and you want to show more than one thumbnail preview at the same time.

In this case, only the second thumbnail preview will work and the first one will stop working at the point you registered second thumbnail preview for the same window.



It did not happened before the update.



Please fix the issue.

It broke my software and I can't solve this bug.. You should fix this bug in the API or you broke working program with this update.



Thanks.

:)

 

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The tutorials provided are just a list of troubleshooting steps. Use only the steps which apply to you.

Since none of the troubleshooting steps here worked, I'd suggest you do a Clean install.

John

 

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DTS supported natively by Windows 8/8.1 and it should work on windows 10 too just DDL require to unlock your driver .

 

Windows Updated(16299.309).KB4088776 Restart is required to complete.


Hi dalchina. Good news, I followed your suggestion and reinstalled the update and now it appears as "installed correctly" *Biggrin Maybe it was not necessary to run the Windows Update Troubleshooter or maybe if necessary. But using it I do not think it could have worsened something. The installation was very fast, unlike the first time it showed step 1 and step 2 completed.

Thanks for the suggestions and for the time to respond Best regards.


And thanks for the tip of that program, I'll have it on my list.