Re: [ctypes-users] more readtlb.py surprises

[Thomas H. <th...@py...>]

Some of these problems are fixed in the version I sent you, others must
be fixed manually:

> Still trundling through editing the generated interface to 
> ESRICore.olb, and came across another couple of oddities...
> Not sure whether you've dealt with these yet:-
> 
> 1. POINTER(HRESULT) -> complains that HRESULT is not a class
> 
> generated class:
> ----------------
> IDatasetEditEx._methods_ = IUnknown._methods_ + [
>     (STDMETHOD(HRESULT, "IsBeingEdited", POINTER(c_int), POINTER(HRESULT))),
> ]
> 
> last couple of lines of traceback:
> ----------------------------------
>   File "C:\Temp\dev\new_area_mgt\ESRICore.py", line 22423, in ?
>     IDatasetEditEx._methods_ = IUnknown._methods_ + [
>   File "C:\PROGRA~1\Python22\Lib\site-packages\ctypes\__init__.py", line
> 189, in POINTER
>     {'_type_': cls})
> exceptions.TypeError: _type_ must be a type
> 
> To fudge my way forward, I've substituted c_void_p for POINTER(HRESULT).
> 

HRESULT is currently a function, not a ctypes data type, it is used to
check for errors in dll-function or COM method calls. It can only be
used as the restype attribute, not in the parameter list. One fix would
be to replace POINTER(HRESULT) with POINTER(c_int), for
example. Personally I've not (yet) encountered an interface where
HRESULT values are received as byref parameters.

> 
> 2. POINTER(None) is generated for a void* reference

Fixed in the version I sent you.

> 
> 3.  related to #1, but encountered in c:\winnt\system32\msxml3.dll, 
> because ESRICore has references to IXMLDOMElement (I had to create a 
> DOMNodeType = tagDOMNodeType alias too).
> 
> class def:
> ----------
> ISAXErrorHandler._methods_ = IUnknown._methods_ + [
>     (STDMETHOD(HRESULT, "error", POINTER(ISAXLocator), POINTER(c_ushort),
> HRESULT)),
>     (STDMETHOD(HRESULT, "fatalError", POINTER(ISAXLocator),
> POINTER(c_ushort), HRESULT)),
>     (STDMETHOD(HRESULT, "ignorableWarning", POINTER(ISAXLocator),
> POINTER(c_ushort), HRESULT)),
> ]
> 
> traceback:
> ----------
>   File "msxml3.py", line 1292, in ?
>     ISAXErrorHandler._methods_ = IUnknown._methods_ + [
>   File "C:\PROGRA~1\Python22\Lib\site-packages\ctypes\com\__init__.py", line
> 59,  in STDMETHOD
>     return name, WINFUNCTYPE(restype, c_voidp, *argtypes)
>   File "C:\PROGRA~1\Python22\Lib\site-packages\ctypes\__init__.py", line 69,
> in WINFUNCTYPE
>     class WinFunctionType(_CFuncPtr):
> TypeError: item 4 in _argtypes_ is not a valid C type
> 

Same as #1, item 4 is the HRESULT again. I have to think about it how
this can be fixed.
The "DOMNodeType = tagDOMNodeType" problem is probably because
TKIND_ALIAS entries are not yet parsed by readtlb.

Andrew, thanks for reporting and 'complaining' about all this, it will
surely help to make readtlb much better.

Thomas