PySide6 QSettings: a way to invoke registerFormat()?

q&a
1

PySide6 QSettings does not expose registerFormat()
https://doc.qt.io/qtforpython-6/PySide6/QtCore/QSettings.html

Is there a way, say with QT QMetaObject or with python ctypes,
still, to invoke registerFormat() from python?

2

Hi @random_hacker
hmmmm… looks like it is: QSettings Class | Qt Core 6.8.1
I do not see, that it is missing as well: Qt for Python Missing Bindings - Qt Wiki

Edit: I never find QSettings useful, more clunky. I just use good old YAML file and store in user home directory. Then is easy to me check settings at start and make migration when some I add, remove or change parameter name.

3

@Michal_Plichta, thank you.

  1. yes, registerFormat() is in fact missing in PySide6.
    this link QSettings Class | Qt Core 6.8.1 is for cpp
    in PySide6 the result of QtCore.QSettings.registerFormat(...) is:
AttributeError: 
type object 'PySide6.QtCore.QSettings' 
has no attribute 'registerFormat'

  1. “good old YAML” usually means PyYAML · PyPI
    which is indeed good, but is not a part of python stdlib
    and also requires binary build during pip install since it comes with c code

  2. the task at hand is to avoid file-based store,
    and use memory-store instead, which in turn is persisted by other means

4

Ot got it… I’m not so familiar with QSettings

So, you want introduce your own format for storing app setting and for some reason you don’t want use
NativeFormat or IniFormat PySide6.QtCore.QSettings.Format ?

5

yes, need to provide for QSettings custom call backs:

  • ReadFunc(...)
  • WriteFunc(...)
6

Probably you can use cffi or ctypes to write Python wrapper to C++ Qt6 library, but for me looks like overkill for such functionality.

On windows you need Qt6Core.dll and different lib on Linux, there are different way to handling native C/C++ library under different OS so introduce some layer of abstraction is needed… but even if you want to produce only support only one OS… I wouldn’t go that route…