[pywin32-bugs] [ pywin32-Bugs-2857273 ] Handling type complex

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Bugs item #2857273, was opened at 2009-09-12 10:02
Message generated for change (Comment added) made by mhammond
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Category: None
Group: None
Status: Closed
Resolution: Wont Fix
Priority: 5
Private: No
Submitted By: no_hope (no_hope)
Assigned to: Nobody/Anonymous (nobody)
Summary: Handling type complex

Initial Comment:
I think win32com may not handle Python's complex type correctly.

I use win32com client to manipulate variable inside LabVIEW. When I read LabVIEW's complex variable it is returned as a tuple. However, when I try to write to a LabVIEW's complex variable using tuple, I get 
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2147352571), 2)
in ._oleobj_.InvokeTypes as if there is type mismatch.
If I supply an object of type complex, win32com is happy but LabVIEW complains (presumably because it wants a tuple).

Is it possible that this is a bug since win32com client sometimes uses tuple and sometimes complex for the same object?


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>Comment By: Mark Hammond (mhammond)
Date: 2009-09-12 11:50

Message:
Yeah, that exception is a COM error thrown by labview.  To be quite honest,
I'm not sure what type win32com will attempt to pass in that case, but
there is no simple COM type which can represent a complex number

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Comment By: no_hope (no_hope)
Date: 2009-09-12 10:17

Message:
Then how come win32com gives me an error unless I give it a an object of
type complex? Or is 
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None,
None, 0, -2147352571), 2)
LabVIEW's exception, not win32com's?

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Comment By: Mark Hammond (mhammond)
Date: 2009-09-12 10:08

Message:
COM doesn't define a complex type, so win32com doesn't either.  I've no
idea what LabVIEW would be expecting to be passed here - but I'm guessing
it uses a simple array of 2 integers or floats, which is what makes you
think win32com sometimes uses a tuple.

You probably need to ask the labview guys what they use to represent a
complex number.

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