BUG: You receive an "Unable to create the function" error message when you try to add a method as the variable type in the ATL Interface Wizard with Visual C++

WORKAROUND

Add these methods by manually editing the .idl, .h, and .cpp files.

The following shows the changes when adding two methods (called Test and Test2 that have SAFEARRAY(BSTR)* and SAFEARRAY(BSTR), respectively) to an interface called IATLObj. IATLObj is implemented by an ATL class called CATLObj.

1. Add this code for the new methods in the .IDL file:

         interface IATLObj : IDispatch
         {
            [id(1)] HRESULT Test([out] SAFEARRAY(BSTR) *ppArrayBstr);
            [id(2)] HRESULT Test2([in] SAFEARRAY(BSTR) pArrayBstr);
         };
   						

2. Add this code to the .H file for the ATL COM object:

         STDMETHOD(Test)(SAFEARRAY **ppArrayBstr);
         STDMETHOD(Test2)(SAFEARRAY *pArrayBstr);
   						

3. And add this code to the .CPP file for the ATL COM object:

         STDMETHODIMP CATLObj::Test(SAFEARRAY **ppArrayBstr)
         {
            return S_OK;
         }
   
         STDMETHODIMP CATLObj::Test2(SAFEARRAY *pArrayBstr)
         {
            return S_OK;
         }