Hello,

I'm new to atl programming but I need to develop a component which
encapsulates a neural network which is part of a c++-dll. Because it
is not possible to use objects derived from a dll in matlab, I have to
create a com-object that wraps the objects (com-objects can be easily
used in matlab).

Until now I have developed the 'main' component that holds the
complete net. So far everything works fine. But I also want to access
single nodes. Therefore I created a new atl object to handle single
nodes of the net. Unfortunately I can't instantiate these objects. A
statement like

  CCBiasedNeuronCtl *tmp = new CCBiasedNeuronCtl()

gives the following compiler error (v++.net):
  d:\users\matthias\projekte\wnetapps\ctlWaveletNet\WaveletNetCtl.cpp(37):
error C2259: 'CCBiasedNeuronCtl' : cannot instantiate abstract class
due to following members:

But no members are listed. The only method I added is not abstract.

Thanks in advance
    Matthias

d:\users\matthias\projekte\wnetapps\ctlWaveletNet\WaveletNetCtl.cpp(37):

You need to wrap your class in an ATL-provided class that implements
IUnknown methods. E.g.

CComObject<CCBiasedNeuronCtl>* pObject;
CComObject<CCBiasedNeuronCtl>::CreateInstance(&pObject);
// Now pObject points to your instance with refcount of 0

--
With best wishes,
    Igor Tandetnik

"For every complex problem, there is a solution that is simple, neat,
and wrong." H.L. Mencken

Change this to:

CComObject<CCBiasedNeuronCtl> *tmp;
CComObject<CCBiasedNeuronCtl>::CreateInstance (&tmp);

The CComObject template fills in the missing implementations for you.