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+--- Thread: how to handle COM Typelib OUT parameters? (/thread-15167.html)
how to handle COM Typelib OUT parameters? - Erhy - Jan-06-2019
Hello!
I try to convert VB-Script to Python script.
I use the packages pywin32, comtypes and pythoncom
I have problems with function imported from typelib having out parameters
e.g. the code with comtypes.client.GetModule generated import file:
COMMETHOD([dispid(1610809357), helpstring('attributes at given index, returns optionally attributes range'), 'propget'], HRESULT, 'Attributes',
( ['in'], c_int, 'index' ),
( ['out', 'optional'], POINTER(VARIANT), 'range', 0 ),
( ['out', 'retval'], POINTER(POINTER(IPLDictionary)), 'pVal' ))How to handle the out parameter 'range', which have not the retval attribute?Although I have declared the values
actIndex : int = textRange[0]
attributesRange : COM.VARIANT = COM.VARIANT(pythoncom.VT_BYREF | pythoncom.VT_ARRAY, [ 0, 0])
with
gotattributes = textInLayer.Attributes(actIndex, attributesRange)
I got
TypeError
int() argument must be a string, a bytes-like object or a number, not 'NoneType'
Thank you for advice
Erhy
RE: how to handle COM Typelib OUT parameters? - Erhy - Jan-26-2019
after many days I quit.
It seems there is no way to code for functions with OUT parameters defined in IDL.
My last trying was to import only win32com.client, but the error message is the same:
int() argument must be a string, a bytes-like object or a number, not 'NoneType'
Tried also with python and pywin32-master from source, but I was not able to find the reason in debug mode.
Had a great hope to port .vbs scripts to python scripts