[python-win32] issues with win32com constants and static/dynamic dispatch

[Jason Ferrara]

On Jul 4, 2007, at 11:20 AM, Simon Dahlbacka wrote:

> my best guess is that you should be using .ProductName (capital p)  
> as static dispatch is case sensitive..
>
> /S

Thats not it.

productName is the correct case.

And also..

 >>> print c
   <PyIUnknown at 0xac640c with obj at 0xf0d808>
 >>> dir(c)
['QueryInterface', '__class__', '__cmp__', '__delattr__', '__doc__',  
'__getattri
bute__', '__hash__', '__init__', '__new__', '__reduce__',  
'__reduce_ex__', '__re
pr__', '__setattr__', '__str__']

That doesn't look right at all. Shouldn't I see the COM methods and  
attributes? For objects that do work I get stuff that looks much more  
sensible.

 >>> print mi
<win32com.gen_py.MIDLibCom 1.0 Type Library.IMIDLib instance at  
0x13079016>
 >>> dir(mi)
['CLSID', 'CloseCameras', 'OpenCameras', '_ApplyTypes_', '__cmp__',  
'__doc__', '
__getattr__', '__init__', '__module__', '__repr__', '__setattr__',  
'_get_good_ob
ject_', '_get_good_single_object_', '_oleobj_', '_prop_map_get_',  
'_prop_map_put
_', 'coclass_clsid']

>
>
> On 7/4/07, Jason Ferrara < jason.ferrara at jacquette.com> wrote:
> 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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>

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