Seg Fault with page.firstWidget

[mpalazz]

Bug

I iterate through widgets on a regular basis. I often use the firstWidget attribute to start a loop with each page. I updated to 1.16.8 recently and all my code started failing on page.firstwidget. I've tried this on many different forms, and it seems to universally fail on versions > 1.16.5.

To Reproduce

random form link for testing

mudoc = fitz.open('cms1490s-english.pdf')
page = mudoc[0]
f = page.firstWidget

Output:

Segmentation fault: 11

Configuration

• Reproduced on MacOS and Windows 10
• Python version 3.7.5
• PyMuPDF >=1.16.6, installed with pip install pymupdf

Additional

Perhaps fixing issue #390 (“Incomplete deletion of annotations”) in 1.16.6 created this bug?
Thanks for the help! Love the software, btw.

[JorjMcKie]

Thanks for submitting this!
I located and fixed the error. Some background:
In some recent version I extended the Widget class with some properties, among them button_caption. The base library's (MuPDF) PDF object text retrieval function I used for this occasionally does not return a proper C char* type (instead pointed into the wild).
This disappeared after switching to a more cautious alternative ...

I presume there is some urgency for you here?
If yes, I can publish a fixed version by tomorrow ...

[JorjMcKie]

BTW you are aware of the new iterator page.wigdets()? It saves you accessing firstWidget yourself, and also allows subselecting the desired widget types.

[mpalazz]

There is no emergency - 1.16.5 is working fine for now. Thanks for your fast response!

I am aware of the new iterator and use it - I just wanted this bug to be clear.

[JorjMcKie]

Just uploaded v1.16.9 which fixes this.