[pywin32-bugs] [ pywin32-Bugs-3152800 ] gen_py fails to map type correctly

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Bugs item #3152800, was opened at 2011-01-07 18:57
Message generated for change (Comment added) made by mhammond
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Category: com
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Klaus Noekel (kahlbutz)
Assigned to: Nobody/Anonymous (nobody)
Summary: gen_py fails to map type correctly

Initial Comment:
Hi,

I am calling a COM server (written in C++) from Python. The COM server defines methods:

interface IMatrix : IDispatch
{
...
  [id(14), helpstring ("Copy matrix contents to a pointer to a C-style 2D double array")]  HRESULT GetValuesRaw ( [in] unsigned int hi, [in] unsigned int lo); 
  [id(15), helpstring ("Copy matrix contents from a pointer to a C-style 2D double array")]  HRESULT SetValuesRaw ( [in] unsigned int hi, [in] unsigned int lo); 
}

Pywin32 does not pick up the unsigned int, but generates

	def GetValuesRaw(self, hi=defaultNamedNotOptArg, lo=defaultNamedNotOptArg):
		"""Copy matrix contents to a pointer to a C-style 2D double array"""
		return self._oleobj_.InvokeTypes(14, LCID, 1, (24, 0), ((3, 1), (3, 1)),hi
			, lo)

where the type id 3 stands for VT_I4 instead of VT_UI4. As you would expect this fails the first time bit 31 of hi or lo is set. 

Is it a bug in pywin32?
If not, how can I influence gen_py so that it correctly recognizes the type? Do I have to write the IDL differently? Can I include hints?
Finally, what I really want to achieve is pass a 64-bit pointer from Python to the C++ COM server. Splitting it into the 32-bit hi/lo parts and passing them separately is my current solution. Am I overlooking a better option?

Thanks and best regards,
Klaus Noekel

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>Comment By: Mark Hammond (mhammond)
Date: 2011-04-23 22:43

Message:
Thanks for the report!  Investigating this shows you are 100% correct and
also led me to another bug - that OverFlowError exceptions passing too
large integers are ignored with -1 silently passed.  Fixed and checked into
hg with tests as of 62ea09011278

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You can respond by visiting: 
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