Python COM: Unable to create server-side object.

[Bill Bell]

arisen at start.no (André) wrote:

> Hi. Something strange is happening to in my Python / COM
> recently (ActiveState Python 2.0 on Win2K). I have created 
> this small class in the file short.py:
> 
>   class Short:
>       _reg_clsid_ = "{74471ADF-9453-4135-87E6-22E1B9499B0D}"
>       _reg_progid_ = "Python.Short"
>       _reg_desc_ = "PythonCOM test"
>       _public_methods = ["isShort"]
> 
>       def __init__(self):
>           self.short = "yes"
> 
>       def isShort(self):
>           return self.short
> 
>   if __name__=="__main__":
>       import win32com.server.register
>       win32com.server.register.UseCommandLine(Short)
> 
> And registered it succcessfully. ($ python short.py)
> 
> When i try
> >>> import win32com.client 
> >>> s = win32com.client.Dispatch("Python.Short")
> 
> I get the following error:
>  (-2147221231, 'ClassFactory cannot supply requested class', None,
>  None)
> 
> If i try it again i get another:
>  (-2147467259, 'Unspecified error', None, None)
> 
> I have tried with diffeetn class names, prog ids and clsids.
> 
> This used to work fine, and i have written several com servers
> in python before which still work. Any ideas?

André,

I added debugging to your code in the following way:

debugging = 1
 
class Short:
    _reg_clsid_ = "{74471ADF-9453-4135-87E6-22E1B9499B0D}"
    _reg_progid_ = "Python.Short"
    _reg_desc_ = "PythonCOM test"
    _public_methods = ["isShort"]
    
    def __init__(self):
        self.short = "yes"

    def isShort(self):
        return self.short

if __name__=="__main__":
    import win32com.server.register
    win32com.server.register.UseCommandLine(Short, 
debug=debugging)

This gives the following diagnostic output in the "win32trace remote 
collector".

Object with win32trace dispatcher created (object=None)
Traceback (most recent call last):
  File "c:\python21\win32com\server\dispatcher.py", line 27, in _CreateInstance_
    self.policy._CreateInstance_(clsid, reqIID)
  File "c:\python21\win32com\server\policy.py", line 200, in _CreateInstance_
    self._wrap_(myob)
  File "c:\python21\win32com\server\policy.py", line 448, in _wrap_
    raise error, "Object does not support DesignatedWrapPolicy"
win32com.server.policy error: Object does not support DesignatedWrapPolicy
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
  File "c:\python21\win32com\client\__init__.py", line 94, in Dispatch
    dispatch, userName = dynamic._GetGoodDispatchAndUserName(dispatch,userName,clsctx)
  File "c:\python21\win32com\client\dynamic.py", line 81, in _GetGoodDispatchAndUserName
    return (_GetGoodDispatch(IDispatch, clsctx), userName)
  File "c:\python21\win32com\client\dynamic.py", line 72, in _GetGoodDispatch
    IDispatch = pythoncom.CoCreateInstance(IDispatch, None, clsctx, pythoncom.IID_IDispatch)
com_error: (-2147467259, 'Unspecified error', None, None)

Any use to you? (Incidentally, I did this in Win95 with newly 
installed ActiveState distribution, installed this morning.)

Bill