Matt Wilbur schrieb: > Hello All, especially Thomas, > > I'm running into a fairly serious snag calling a method that is supposed to > take a SAFEARRAY** as input. The class generated from GetModule is > > IIviSpecAnTrace._methods_ = [ > COMMETHOD([helpstring(u'This function returns the trace the spectrum > analyzer aquires.')], HRESULT, 'FetchY', > ( ['in', 'out'], POINTER(_midlSAFEARRAY(c_double)), > 'Amplitude' )), > > <other methods omitted> > > ] > > >>From the header file its: > > public: > virtual /* [helpcontext][helpstring] */ HRESULT STDMETHODCALLTYPE > FetchY( > /* [out][in] */ SAFEARRAY __RPC_FAR * __RPC_FAR *Amplitude) = 0; > > > > Everything was going swimmingly until I tried to use this function. Here's > what I do: > > In [305]: safe2 = (c_double*401)() > > In [306]: safe2 > Out[306]: <__main__.c_double_Array_401 object at 0x0292A670> > > I tried manually creating the SAFEARRAY and passing it to the FetchY method, > but I got bounced because it looked like the underlying Python code was > constructing it for me. > > However, the array, when returned, is filled with 0.0. In fact, whatever I > fill the array with, it remains unchanged after the call. > > I've verified things work correctly at the C++ level, and I've verified the > instrument is communicating and sending back the right values. I'm > obviously buggering something up, but after a day and a half of > investigation, I have to admit I'm stumped. I don't know enough about the > internals of comtypes to debug this, so I'm hoping Thomas can help me out.
Yes, it looks like the safearray support is still very buggy. What I (deperately) need are some COM objects that use SAFEARRAY parameters. Googling for 'IIviSpecAndTrace' I found ivifoundation.org. It looks like they provide drivers for a Agilent 54642D mixed signal scope that I have on my bench, so maybe this could be something. Matt, can you help me (maybe off-list) getting started with this? Thomas ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ comtypes-users mailing list comtypes-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/comtypes-users
