Thanks very much for the reply -- that got me a good way there, but
now I have further questions.
I'm working with some ESRI com libraries. I've managed to retrieve an
ILayer from an IMap and then cast IFeatureLayer from the ILayer.
fc = layer.QueryInterface(comtypes.gen.esriGeoDatabase.IFeatureLayer)
I don't have much experience at all with COM and what's confusing me
now is difference between methods and properties as they are seen by
comtypes. I can do
feature.DataSourceType
and get:
u'Personal Geodatabase Feature Class'
but doing:
feature.FeatureClass
which is what I really need to do, yields:
<bound method POINTER(IFeatureLayer).FeatureClass of <POINTER
(IFeatureLayer) object cbc990>>
And
feature.FeatureClass()
yields:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: required argument 'fclass' missing
fclass needs to be a pointer to an IFeatureClass whose CoClass,
FeatureClass, is a non-creatable COM class.
I'm not sure if matters but the relevant parts of feature._methods_ are:
(<class 'ctypes.HRESULT'>, '_get_FeatureClass', (<class
'ctypes.LP_POINTER(IFeatureClass)'>,), ((10, 'fclass'),), ('propget',
u"The layer's feature class."), u" The layer's feature class.")
(<class 'ctypes.HRESULT'>, 'FeatureClass', (<class 'comtypes.POINTER
(IFeatureClass)'>,), ((1, 'fclass'),), ('propputref', u"The layer's
feature class."), u"The layer's feature class.")
(<class 'ctypes.HRESULT'>, '_get_DataSourceType', (<class
'ctypes.LP_BSTR'>,), ((10, 'Text'),), ('propget', u'Data source
type.'), u'Data source type.')
(<class 'ctypes.HRESULT'>, '_set_DataSourceType', (<class
'comtypes.BSTR'>,), ((1, 'Text'),), ('propput', u'Data source
type.'), u'Data source type.')
Lastly, feature.FeatureClass works fine in VB, for what that's worth.
FeatureClass is read-only. Would that have anything to do with it?
thanks very much,
Nick
On Oct 18, 2007, at 8:25 PM, Andrew MacIntyre wrote:
> Nick Collier wrote:
>
>> I'm trying to use python to work with the various ESRI (the GIS
>> folks) com libraries. However, I'm running into some difficulties.
>>
>> I've run makepy on the type library I'm interested in working with
>> and that yields:
>>
>> ...
>> # This CoClass is known by the name 'esriSystem.AoInitialize.1'
>> class AoInitialize(CoClassBaseClass): # A CoClass ...
>>
>>
>> But dispatching to that
>>
>>>>> client.Dispatch("esriSystem.AoInitialize.1")
>> Traceback (most recent call last):
>> File "<interactive input>", line 1, in <module>
>> File "C:\Python25\Lib\site-packages\win32com\client\__init__.py",
>> line 95, in Dispatch
>> dispatch, userName = dynamic._GetGoodDispatchAndUserName
>> (dispatch,userName,clsctx)
>> File "C:\Python25\lib\site-packages\win32com\client\dynamic.py",
>> line 98, in _GetGoodDispatchAndUserName
>> return (_GetGoodDispatch(IDispatch, clsctx), userName)
>> File "C:\Python25\lib\site-packages\win32com\client\dynamic.py",
>> line 78, in _GetGoodDispatch
>> IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx,
>> pythoncom.IID_IDispatch)
>> com_error: (-2147467262, 'No such interface supported', None, None)
>>
>> I'm assuming that this is because this doesn't implement IDispatch.
>>
>> The relevant VB code does:
>>
>> Set m_pAoInitialize = New AoInitialize
>>
>> Is there any equivalent in win32com (or even ctypes) that I can
>> use to
>
>> get this working or is Python out of the question here?
>
> A lot of the ESRI COM stuff doesn't support IDispatch. ctypes,
> with the
> comtypes add-on module, can be used to call the ESRI COM interfaces
> quite successfully in my experience.
>
> I've not tried using the ESRI 9.x stuff yet - still using 8.3 and an
> ancient version of ctypes. With the ESRI 8.x TLBs, there were issues
> where many of the names were declared out of order as far as Python
> was
> concerned and the generated modules had to be manually edited to
> rectify
> this. With 9.x, ESRI split the TLBs up a lot more so I don't know how
> much this affects what gets generated.
>
> -------------------------> "These thoughts are mine alone!" <---------
> Andrew MacIntyre National Licensing and Allocations Branch
> tel: +61 2 6219 5356 Inputs to Industry Division
> fax: +61 2 6253 3277 Australian Communications & Media Authority
> email: [EMAIL PROTECTED]
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