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Enable creating subclasses of com_record #2361

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geppi opened this issue Aug 13, 2024 · 1 comment
Open

Enable creating subclasses of com_record #2361

geppi opened this issue Aug 13, 2024 · 1 comment

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@geppi
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geppi commented Aug 13, 2024

It would be desirable to create subclasses of com_record to enable typing of interface methods that expect a particular structure as a parameter.

I've just started to look into writing C/C++ Python extensions and therefore probably do not understand what problems it would create when the PyRecord::Type structure would be modified to allow this.

Wouldn't it be just sufficient to set the field:

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags

and to define a function for the tp_new field in the PyRecord::Type structure?

This function could make use of the PyRecord::pythoncom_GetRecordFromGuids function to create the new instance.

I'm wondering what the reason was, to just allow the creation of com_record instances via the factory function win32com.client.Record and not allow the creation of subclasses. Would this open a Pandora's box of issues that I probably do not see?

@mhammond
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I suspect this was done for 20 year old reasons that no longer apply. I see no problem with allowing subclasses here.

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