Optional Parameters in python COM

[Rane Bowen]

Hi,

I am using python with a makepy generated wrapper on a COM application. One
of this object's methods has 3 parameters, two of which are optional.
If I call the method with just the non-optional parameter, or all three
parameters, it works. If I call it with the first two parameters, I get the
following error:

(-2147352567, 'Exception occurred.', (0, 'Amphora.Session.1', 'A bad
parameter was passed to the method', None, 0, -1610547133), None)

I have tried calling the method by using the names of the optional
parameters, and I have also tried using pythoncom.Missing and
pythoncom.Empty for the non essential parameter. I have also edited the
generated .py file so that it contains the following:

defaultNamedOptArg=pythoncom.Empty
defaultNamedNotOptArg=pythoncom.Empty
defaultUnnamedArg=pythoncom.Empty

But this has not made any difference! Any help would be very much
appreciated.

Cheers,

Rane

 

[Rane Bowen]

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[Rane Bowen]

<grind>

<bump>

 

[Mark Hammond]

Hi,

I am using python with a makepy generated wrapper on a COM application. One
of this object's methods has 3 parameters, two of which are optional.
If I call the method with just the non-optional parameter, or all three
parameters, it works. If I call it with the first two parameters, I get the
following error:

(-2147352567, 'Exception occurred.', (0, 'Amphora.Session.1', 'A bad
parameter was passed to the method', None, 0, -1610547133), None)

I have tried calling the method by using the names of the optional
parameters, and I have also tried using pythoncom.Missing and
pythoncom.Empty for the non essential parameter. I have also edited the
generated .py file so that it contains the following:

defaultNamedOptArg=pythoncom.Empty
defaultNamedNotOptArg=pythoncom.Empty
defaultUnnamedArg=pythoncom.Empty

But this has not made any difference! Any help would be very much
appreciated.

Can you reproduce this problem with a "common" object, such as IE,
MSOffice, or a trivial VB object with sourcecode? The problem is that
it is up to each object to implement optional params, so it is very hard
to pinpoint bugs in win32com here.

Mark.