Programming AutoCAD 2007 by compypes 0.5.1 I faced the following problem:
The test variable is an object of IAcadBlockReference, which has a
method GetAttributes() in the form of (from the generated Python
wrapper):
COMMETHOD([dispid(9), helpstring(u'Gets Attributes in the
block')], HRESULT, 'GetAttributes',
( ['retval', 'out'], POINTER(VARIANT), 'pAttrObjs' )),
The returning VARIANT is an array containing objects of VT_DISPATCH.
This type of VARIANT is handled by comtypes.automatation as
demonstrated by the following exception:
>>> result = test.GetAttributes()
Traceback (most recent call last):
File "d:\MyProjects\Gromaqua\ACAD-comtypes\<string>", line 1, in <module>
File "d:\Python25\Lib\site-packages\comtypes\automation.py", line
394, in __ctypes_from_outparam__
result = self.value
File "d:\Python25\Lib\site-packages\comtypes\automation.py", line
345, in _get_value
typ = _vartype_to_ctype[self.vt & ~VT_ARRAY]
KeyError: 9
Indeed, in line 683 of automatation.py you find:
# These are not yet implemented:
## POINTER(IUnknown): VT_UNKNOWN,
## POINTER(IDispatch): VT_DISPATCH,
I found that simply uncommenting the above lines solves my problem:
test.GetAttributes() returns a tuple of comtypes.POINTER(IDispatch)
objects, and comtypes.client.GetBestInterface() makes a good job in
converting them into the proper AutoCAD objects.
So what does it mean that the above types of VARIANT are not implemented?
Regards,
Géza Groma
Institute of Biophysics
Biological Research Center of the Hungarian Academy of Sciences
Temesvári krt. 62.
6701 Szeged, Hungary
phone: +36 62 599 620 fax: +36 62 433 133 mobile: +36 20 5648 303
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