Runtime Error "ffi_prep_cif_var failed" when using "FontSize" under MacOS

[nlekuona]

Using Spire.Doc.Free or Spire.Doc trial on a MacOS machine, when running the sample code on your website I hit the following error every time FontSize is invoked:

ffi_prep_cif_var failed

It happens when trying to assign a Font Size to either a footnote with:

text.CharacterFormat.FontSize = 8 (sample value, no number is accepted)

or when trying to assign Font Size to a footnote marker with:

footnote.MarkerCharacterFormat.FontSize = 10 (sample value, no number is accepted)

If entering any incorrect value other than float, the condition is detected and rejected; but when a float is provided, as it should, the error above shows.

Result is that it is not possible to assign a Font Size to any element.

Versions

• Python 3.14
• MacOS 15.7
• Spire.Doc.Free 12.12.0
  or
• Spire.Doc trial 13.8.0

[eiceblue]

Thank you for your feedback.

I have reproduced the issue and have already reported it to the development team. The issue ID is SPIREDOC-11602. I will notify you immediately once it is resolved or if there are any updates.

We sincerely apologize for the inconvenience this may have caused.

[eiceblue]

Hello，

Thank you for your patience. Glad to inform you that our latest version Spire.Doc for Python Version:14.1.6 includes fixes for SPIREDOC-11602 issue, please update and test it.