crash when using TDLib with WXPython.

[jawhien]

When I try to use TDLib with the WXPython library, I get the following exception after the first call to td_execute, td_send or td_receieve:

OSError: exception: access violation reading 0x00000000

The problem only occurs when the WXPython library is imported. The libraries work fine separately from each other.

Also if TDLib is compiled in visual studio 2019 there is no problem.

I think the problem appeared when visual studio 2022 was updated to version 17.10 or 17.11
Because before that I compiled tdLib in vs 2022 and there were no conflicts with WXPython.

[levlam]

Could you try to rebuild TDLib with the workaround described at #2912 (comment)?

[jawhien]

@levlam
Yes, thank you. It work!

Now only one question remains, can this be fixed in tdLib itself, or is it necessary to use this workaround for compilation every time?

Or would it be much more correct to use vs 2019 for the build, since this workaround may cause other unforeseen problems?
I'm interested in your opinion on this issue. Thank you very much!

[levlam]

The MSVC changelog says

Programs that aren't following the documented restrictions on binary compatibility may encounter null dereferences in mutex machinery. You must follow this rule: When you mix binaries built by different supported versions of the toolset, the Redistributable version must be at least as new as the latest toolset used by any app component.

Are you sure that you have Redistributable of the new enough version?

[jawhien]

@levlam
Oh, that's the thing!
Thanks, now I have figured out this problem.

I mistakenly thought that Visual studio installed the C++ redistributables on the system, but this actually does not happen. In addition, some WXPython wheels contain an old version of the msvcp140.dll library, which also leads to the problem.

[levlam]

an old version of the msvcp140.dll library, which also leads to the problem.

Yes, this is the cause of the issue.