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#1
June 4th, 2004, 01:12 PM
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Com
I'm trying to access some COM objects with Python. I read some sample code with the following line:
o = win32com.client.Dispatch("Object.Name") eg. o = win32com.client.Dispatch("Excel.Application") How do I know what I should put as "Object.Name"? I couldn't find anything from the doc of my COM objects.
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#2
June 4th, 2004, 01:50 PM
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you mean..
Code:
import win32com print dir( win32com )  there you have mostly everything, run the code
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#3
June 4th, 2004, 03:40 PM
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Quote:
It should be stated in the docs for the COM object, but it often isn't (M$ docs are particularly bad for this). There is one way I know to find out, but it is a bit long-winded and there may well be easier ways. 1) open the PythonWin IDE and select the "tools/COM makepy utility" menu entry. 2) select the type library that you want in the listbox and click OK. This will generate the stub file for that type library. 3) navigate to Python\Lib\site-packages\win32com\gen_py and open the .py file you have just generated. The files are named after the library GUID, so it is easiest to use the timestamp to find the most recent file. 4) The stub file will have a class derived from 'CoClassBaseClass' for each class in the type library. The comment just before the class definition gives the name that you want. e.g. Code:
from win32com.client import CoClassBaseClass
# This CoClass is known by the name 'Excel.Application.8'
class Application(CoClassBaseClass): # A CoClass
CLSID = IID('{00024500-0000-0000-C000-000000000046}')
coclass_sources = [
AppEvents,
]
default_source = AppEvents
coclass_interfaces = [
_Application,
]
default_interface = _Application
Generating the stubs has other advantages too. It not only speeds up accessing the COM objects, but it also enables you to query the interfaces in interactive mode. e.g. Code:
>>> app = win32com.client.Dispatch("Excel.Application")
>>> dir(app)
['ActivateMicrosoftApp', 'AddChartAutoFormat', 'AddCustomList', 'CLSID', 'Calculate', 'CentimetersToPoints',...]
>>>
Dave - The Developers' Coach Last edited by DevCoach : June 4th, 2004 at 03:46 PM.
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#4
June 4th, 2004, 04:14 PM
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I should add that not every class will have the comment at the start - I think it is only those that are intended to be creatable directly by calls to win32com.client.Dispatch(). Other classes will be generated only by method calls on existing objects.
Note that for Excel at least, it is not always necessary to start by creating the Application object. If you create a Sheet object then the Application object will be automatically created along with a single Sheet, and can be accessed by the Sheet.Application property. Dave - The Developers' Coach
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#5
June 7th, 2004, 09:07 AM
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There's a line like this in the .py file that the makepy utility generated.
# This CoClass is known by the name 'SMIEngine.SMIHost.1' I tried w=win32com.client.Dispatch("SMIEngine.SMIHost") but I got the following error message Traceback (most recent call last): File "<interactive input>", line 1, in ? File "C:\Python23\Lib\site-packages\win32com\client\__init__.py", line 95, in Dispatch dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx) File "C:\Python23\Lib\site-packages\win32com\client\dynamic.py", line 91, in _GetGoodDispatchAndUserName return (_GetGoodDispatch(IDispatch, clsctx), userName) File "C:\Python23\Lib\site-packages\win32com\client\dynamic.py", line 79, in _GetGoodDispatch IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.IID_IDispatch) com_error: (-2147467262, 'No such interface supported', None, None) Did I do anything wrong? Thank you.
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