[python-win32] a question about word addin , IRibbonExtensibility, GetCustomUI, getImage, IPicture

[Mark Hammond]

I've lost some of the context here, but there is a 
pythoncom.ObjectFromAddress that looks like it does exactly what you 
want - check out the pywin32 docs for details...

HTH,

Mark

On 14/12/2012 11:04 AM, Gilles Baggieri wrote:
> Mark Hammond <skippy.hammond <at> gmail.com> writes:
>
>>
>> I'm not familiar enough with ctypes to know if that makes sense, but I
>> doubt it - nothing would seem to know the size of the buffer pointed at
>> by 'x'.  You probably need to stick with using a python string object -
>> ensure the string contains exactly the bytes of the metafile.
>>
>> Mark
>>
>> On 25/03/2012 10:33 PM, shuwj wrote:
>>>
>>>> I believe a c_void_p is a ctypes construct which aren't supported by
>>>> pywin32.  You need to convert it to a "normal" Python type.  I'm
>>>> guessing it is binary data, so in py2k, you should be able to simply use
>>>> buffer(some_string_object).  The error message seems to imply you may
>>>> even be able to use buffer(c_void_p_object), but I don't know how they
>>>> work well enough to suggest that will actually work.
>>>>
>>>> Mark
>>>>
>>>
>>> Hi Mark,
>>> Thanks for your reply. I use buffer() in GetImage method and there's no
>>> exception now,  but they don't work as expected.
>>>
>>>
>>> -----------------------------------------
>>> class wordaddin:
>>>       def GetImage(self,ctrl):
>>>           from gdiplus import LoadImage
>>>           i = LoadImage( 'c:/edit.png' )
>>>           i = buffer(i)
>>>           print i, 'ddd'
>>>           return i
>>> -----------------------------------------
>>>
>>>
>>
> Hello,
>
> After spending several hours with the same problem (thanks for gdiplus.py, great
> job!), I've found a solution from Thomas Heller's comtypes testunits. The idea
> is to cast 'x' (pointer) to a comtypes POINTER(IUnknown), and then convert again
> to pythoncom PyIDispatch.
> Add this to the end of gdiplus LoadImage (but don't use buffer() as the returned
> object can be return as is to RibbonX callback):
>
>
>      ...
>      if not x.value:
>          return None
>
>      from comtypes.automation import VARIANT, IUnknown, IDispatch
>      from ctypes import cast, POINTER, PyDLL, py_object, c_void_p, byref
>      from ctypes.wintypes import BOOL
>      import pythoncom
>
>      # cast to comtypes IUnknown
>      cobj = cast(x,POINTER(IUnknown))
>
>      # cast to PyIDispatch
>      _PyCom_PyObjectFromIUnknown =
> PyDLL(pythoncom.__file__).PyCom_PyObjectFromIUnknown
>      _PyCom_PyObjectFromIUnknown.restype = py_object
>      _PyCom_PyObjectFromIUnknown.argtypes = (POINTER(IUnknown), c_void_p, BOOL)
>
>      return _PyCom_PyObjectFromIUnknown(cobj, byref(IDispatch._iid_), True)
>
>
> Perhaps is there a shorter (and clearer!) way...
>
> Gilles
>
>
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