We are having occasional difficulties when we need to pass an argument
in-and-out of a COM method that we are calling in Python. There is some magic
in makepy that normally handles this for us but occasionally it fails because
it somehow reads the typelib incorrectly and misunderstands the data type it
must create. Specifically, I have a C++ method exposed to COM and it expects
an empty SafeArray of two elements (double floats) to be passed as an argument.
That method revises the array, filling it with two values. We have found that
makepy assigns some sort of identifier to each data type. For instance an
array of strings is assigned (24584, 3) and an array of variants is assigned
(24588, 3) as shown in the line of code below, taken from one of the wrappers
created by Makepy.
def GetDirection(self, oDirection=(0,0)):
return self._ApplyTypes_(1611137025, 1, (24, 0), ((24588,3),),
u'GetDirection', None, oDirection)
Occasionally pywin32 assigns the wrong identifier then the argument is cast as
the wrong data type and an error is thrown. We stumbled upon the correct
identifier and when we corrected the identifier assigned by Makepy then we were
able to call the method without throwing an error. Where can we find a list of
these identifiers?
Mike Fox
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