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.
Matt
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