Steps to create a simple SI Add-in using Visual C++ 6.0

1) Create new project using MFC AppWizard (dll)
   (optional) MFC Statically Linked
   Automation

2) Insert new ATL object:  Simple Object (or whatever you want to implement)
   Default settings

3) In ClassView, right-click on class and select
   "Implement Interface..."
   Browse type libraries and select
   "Smallworld Spatial Intelligence Extensibility Objects"
   Add the _SIExtensibility interface

4) Add implementation code!

My preference is to move the methods to the .cpp file
and just leave declarations in the .h file, as follows:

.h:

   STDMETHOD(get_AddInProperties)(_SIAddInProperties * * );
   STDMETHOD(Initialise)(IDispatch * * SpatialIntelligence);
   STDMETHOD(Activate)(VARIANT * Custom);
   STDMETHOD(Terminate)(VARIANT * Custom);

.cpp:

STDMETHODIMP CSiTestAddin::get_AddInProperties(_SIAddInProperties * * prop)
{

   // TO DO:  Add implementation code
   return NOERROR;

}

STDMETHODIMP CSiTestAddin::Initialise(IDispatch * * SpatialIntelligence)
{

   // TO DO:  Add implementation code
   return NOERROR;

}

STDMETHODIMP CSiTestAddin::Activate(VARIANT * Custom)
{

   // TO DO:  Add implementation code
   return NOERROR;

}

STDMETHODIMP CSiTestAddin::Terminate(VARIANT * Custom)
{

   // TO DO:  Add implementation code
   return NOERROR;

}

For an example of a final product, see the SI Version Navigator Add-in project.

Enjoy!