c = win32com.client.Dispatch(c.QueryInterface(pythoncom.IID_IDispatch))
works. Thanks!
FYI, c=win32com.client.Dispatch(c) does not.
>>> c=win32com.client.Dispatch(c)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python25\Lib\site-packages\win32com\client\__init__.py",
line 96, in Dispatch
return __WrapDispatch(dispatch, userName, resultCLSID, typeinfo,
UnicodeToString, clsctx)
File "C:\Python25\Lib\site-packages\win32com\client\__init__.py",
line 44, in __WrapDispatch
return dynamic.Dispatch(dispatch, userName, WrapperClass,
typeinfo, UnicodeToString=UnicodeToString,clsctx=clsctx)
File "C:\Python25\lib\site-packages\win32com\client\dynamic.py",
line 111, in Dispatch
typeinfo = IDispatch.GetTypeInfo()
AttributeError: 'PyIUnknown' object has no attribute 'GetTypeInfo'
On Jul 4, 2007, at 7:03 PM, Mark Hammond wrote:
That is strange - the problem is that the resulting COM object is
returning an IUnknown rather than an IDispatch. A work around
should be to say:
c = cams[0]
c = win32com.client.Dispatch(c)
or possibly:
c = win32com.client.Dispatch(c.QueryInterface
(pythoncom.IID_IDispatch))
I think we could also argue this is a bug in win32com - it should
try and QI any IUnknown objects - but changing this might break
existing code...
Mark
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:python-win32-
[EMAIL PROTECTED] Behalf Of Jason Ferrara
Sent: Thursday, 5 July 2007 12:30 AM
To: python-win32@python.org
Subject: [python-win32] issues with win32com constants and static/
dynamicdispatch
I'm trying to use a COM library from python.
If I use dynamic dispatch, the com objects all behave correctly,
but the constants defined in the COM library don't show up.
If I use static dispatch, the constants show up, but COM objects
returned by calls into the COM library seem broken.
As example, starting with dynamic dispatch
Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more
information.
>>> import win32com.client
>>> mi=win32com.client.Dispatch("MIDLIBCom.MIDLib")
>>> cams=mi.OpenCameras("C:\Program Files\Micron Imaging
\sensor_data")
>>> c=cams[0]
>>> print c
<COMObject OpenCameras>
>>> print c.productName
Micron Imaging DEMO2
So far everything is fine, but now...
>>> print win32com.client.constants.MI_BAYER_8
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python25\Lib\site-packages\win32com\client
\__init__.py", line 168, in
__getattr__
raise AttributeError, a
AttributeError: MI_BAYER_8
This is no good. So now I try static dispatch
Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more
information.
>>> import win32com.client
>>> mi=win32com.client.gencache.EnsureDispatch("MIDLIBCom.MIDLib")
>>> print win32com.client.constants.MI_BAYER_8
1
Things are looking better, but now...
>>> cams=mi.OpenCameras("C:\Program Files\Micron Imaging
\sensor_data")
>>> c=cams[0]
>>> print c
<PyIUnknown at 0xac640c with obj at 0xf0d808>
>>> print c.productName
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'PyIUnknown' object has no attribute 'productName'
So whats going on here? What am I doing wrong?
Thanks
- J
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