cannot load library 'gobject-2.0-0' - windows 10

[lmcamoes]

first of all, Thank you for your hard work and support.

I would like to use WeasyPrint on my Flask project but I am having some issues that I can't solve.
I follow instructions from https://doc.courtbouillon.org/weasyprint/stable/first_steps.html but with no success.
My system:
windows 10 Pro x64
Visual studio code 1.86.1
Python 3.12.1

I Installed GTK3 on C:\Program Files\GTK3-Runtime Win64

when running my code I have the error:
Exception has occurred: OSError
cannot load library 'gobject-2.0-0': error 0x7e. Additionally, ctypes.util.find_library() did not manage to locate a library called 'gobject-2.0-0'

Please help.

(.venv) PS E:\Finances\Flask example> python -m weasyprint --info
System: Windows
Machine: AMD64
Version: 10.0.19045
Release: 10

WeasyPrint version: 61.0
Python version: 3.9.7
Pydyf version: 0.8.0
Pango version: 15003

[liZe]

Hi!

If you’re sure that:

• your OS is 64 bit,
• your Python version is 64 bit,
• your GTK libraries are actually installed in "C:\Program Files\GTK3-Runtime Win64" with DLLs in the "bin" folder,
• WEASYPRINT_DLL_DIRECTORIES is not set,
• your version of WeasyPrint is up to date,

then there’s nothing I can do for you. You’ll have to ask Windows gurus how it’s possible not to find a library when os.add_dll_directory has been called with the correct folder.

Other solutions for you are:

• debug the _dlopen function to find what’s actually wrong,
• use WSL,
• use Conda,
• use another OS,
• manually copy the DLL files to the folder where your Flask app is launched (that’s a bad idea),
• try the new Windows executable (it’s in weasyprint-windows.zip).

[lmcamoes]

Thank you!
Just uninstalled everything and re-installed and with the following:
(.venv) PS E:\Finances\Flask example> python -m weasyprint --info
System: Windows
Machine: AMD64
Version: 10.0.19045
Release: 10

WeasyPrint version: 61.0
Python version: 3.9.7
Pydyf version: 0.8.0
Pango version: 15003

Is not giving errors anymore!!!
thanks

[liZe]

PS E:\Finances\Flask example> python -m weasyprint --info

I didn’t see this. If --info includes the Pango version, then it has definitely found the GObject DLL.

[ilovefreesw]

I fixed this error by installing GTK Windows Runtime: https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer/releases

Just installed weasyprint using uv: uv add weasyprint

and then installed the runtime from above link, it automatically sets path and after that it worked.

[liZe]

Adding DLLs to PATH leads to DLL hell problems, and may break other programs that rely on that (see #2480 among others). There’s a dedicated part in the documentation about how to set a specific environment variable instead of setting PATH.

🙏 Please follow the installation steps if you want to get WeasyPrint working. And please open a new issue if you followed the documentation and have a problem. 🙏

(@ilovefreesw thanks for sharing your solution, but even if it works for you, this is not the best way to install WeasyPrint. Adding DLLs to PATH can break other programs. GTK for Windows is not maintained anymore, it brings outdated libraries with unfixed bugs. We prefer to give a single clean and tested way to install WeasyPrint in our documentation, as it avoids a brunch of problems that may not be obvious at first.)