[python-win32] win32com confusion: PROPERTY with arguments vs. METHOD.

[bosch9y at arcor.de]

We use an IVI-COM Server for an Agilent power supply. 

The documentation defines "Status.Register" to be a PROPERTY, but also specifies arguments to be used when calling it (apparently a rare case we haven't come across before). 

Init code: 
>>> import win32com.client 
>>> o=win32com.client.Dispatch("AgilentN57xx.AgilentN57xx.1") 
>>> o.Initialize('UsbDevice1', False, True) 

It looks like "Status.Register" was a bound as a METHOD in win32com: 
>>> o.Status.Register 
<bound method CDispatch.Register of <COMObject <unknown>>> 

Trying to assign a value to it raises an exception: 
>>> o.Status.Register = 1 
Traceback (most recent call last): 
File "<interactive input>", line 1, in ? 
File "C:\Python23\Lib\site-packages\win32com\client\dynamic.py", line 543, in __setattr__ 
raise AttributeError, "Property '%s.%s' can not be set." % (self._username_, attr) 
AttributeError: Property '<unknown>.Register' can not be set. 

The exception suggests that it really is a PROPERTY. 

Calling the "PROPERTY" as specified to read the power supply's status register (with main type=3, subtype=0) also raises an exception: 
>>> o.Status.Register(3,0) 
Traceback (most recent call last): 
File "<interactive input>", line 1, in ? 
File "<COMObject <unknown>>", line 2, in Register 
com_error: (-2147352573, 'Member not found.', None, None) 

We stepped through dynamic.py and it seems that 'win32com' gets confused in this case and mixes up METHOD and PROPERTY handling. 

All other COM METHODS and PROPERTIES work fine. 

Is this a win32com bug, or a misunderstanding on our part? 

Can anyone suggest a workaround? 

We use:
PythonWin 2.3.5 (#62, Feb 9 2005, 16:17:08) [MSC v.1200 32 bit (Intel)] on win32.
Windows 2000

Many thanks for your help ! 


Fritz Bosch

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