[python-win32] How to work with Dispach callback?

[Mark Hammond]

It appears that the "universal gateway" support in pywin32 doesn't handle
VT_RECORD.  I doubt this would be hard to fix, but its not something I have
time to look at in the short term.  I'd suggest you open a bug at
sourceforge, and/or let me know if you are interested in getting your hands
dirty and trying to help fix it (but you will require a C++ compiler)

Cheers,

Mark
 
> -----Original Message-----
> From: python-win32-bounces at python.org [mailto:python-win32-
> bounces at python.org] On Behalf Of Alexandr N Zamaraev
> Sent: Friday, 15 February 2008 10:16 PM
> To: python-win32 at python.org
> Subject: Re: [python-win32] How to work with Dispach callback?
> 
> Mark Hammond wrote:
> > I'd suggest passing 'useDispatcher=1' to com_wrap, so that debug
> output is
> > generated as your object is called (you can see it via the
> win32traceutil.py
> > tool).
> Thank you for the reply.
> 
> I'd made it in such way:
> <code lang='python'>
> class LocateCommandEvents(object):
>    _com_interfaces_ = [IID_ILocateCommandEvents]
>    _typelib_guid_ = '{CF9F97BF-39F2-4B8E-835C-8BE9E99DAF5B}'
>    _typelib_version_ = 8, 0
>    _typelib_lcid_ = 0
> 
>    _public_methods_ = []
>    _dispid_to_func_ = {
>      0x60020000: 'Accept', 0x60020001: 'LocateFailed', 0x60020002:
> 'LocateFilter', 0x60020003: 'LocateReset', 0x60020004: 'Cleanup',
> 0x60020005: 'Start', 0x60020006: 'Dynamics'}
> </code>
> after it and after editing in win32com.server.policy
> (http://sourceforge.net/tracker/?func=detail&aid=1892592&group_id=78018
> &atid=551956)
> 
> the call of
> StartLocate has worked successfully.
> 
> Now errors occur in calls to LocateCommandEvents.LocateFilter function
> from MicroStation:
> <code>
> pythoncom error: Failed to call the universal dispatcher
> 
> Traceback (most recent call last):
>    File "C:\Lang\Python\25\lib\site-packages\win32com\universal.py",
> line 193, in
>   dispatch
>      WriteFromOutTuple(retVal, meth._gw_out_args, argPtr)
> <type 'exceptions.TypeError'>: The VARIANT type is unknown (0x24).
> pythoncom error: Unexpected gateway error
> 
> Traceback (most recent call last):
>    File "C:\Lang\Python\25\lib\site-packages\win32com\universal.py",
> line 193, in
>   dispatch
>      WriteFromOutTuple(retVal, meth._gw_out_args, argPtr)
> <type 'exceptions.TypeError'>: The VARIANT type is unknown (0x24).
> </code>
> 
> Perhaps the reason of it is that ILocateCommandEvents turn out not
> fully
> compatible with IDispatch interfaces:
> <code lang='IDL'>
>      [
>        odl,
>        uuid(67CBDE4A-F073-11D4-A8E6-00508B4D8FED),
>        helpcontext(0x0000021a),
>        dual,
>        nonextensible,
>        oleautomation
>      ]
>      interface ILocateCommandEvents : IDispatch {
>          [id(0x60020000), helpcontext(0x0000001d)]
>          HRESULT Accept(
>                          [in] _Element* Element,
>                          [in, out] Point3d* Point,
>                          [in] _View* View);
>          [id(0x60020001), helpcontext(0x00000025)]
>          HRESULT LocateFailed();
>          [id(0x60020002), helpcontext(0x00000026)]
>          HRESULT LocateFilter(
>                          [in] _Element* Element,
>                          [in, out] Point3d* Point,
>                          [in, out] VARIANT_BOOL* Accepted);
>          [id(0x60020003), helpcontext(0x00000027)]
>          HRESULT LocateReset();
>          [id(0x60020004), helpcontext(0x00000020)]
>          HRESULT Cleanup();
>          [id(0x60020005), helpcontext(0x0000002e)]
>          HRESULT Start();
>          [id(0x60020006), helpcontext(0x00000022)]
>          HRESULT Dynamics(
>                          [in, out] Point3d* Point,
>                          [in] _View* View,
>                          [in] MsdDrawingMode DrawMode);
>      };
> </code>
> Point3d - struct, MsdDrawingMode - enum, declared in MicroStation
> Typelib.
> 
> Can you give me an advise in the case?
> 
> > Its hard to tell though, as the MicroStation object is throwing a
> > type error without providing any other information about what it is
> upset
> > about.  You might want to check that MicroStation supports IDispatch
> based
> > event interfaces, otherwise you will need yet more magic to make
> things
> > work...
> >
> > Cheers,
> >
> > Mark
> 
> 
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