BUG: Compile Errors Result for Certain ATL Method Parameters

   SAFEARRAY(type) pSA
   SAFEARRAY(type) *ppSA
				

RESOLUTION

To cause the ATL code to compile, you must make modifications to the method that was added with the ATL COM Interface wizard in the .h and .cpp files.

The correct declarations and definitions that must be used for each of the known data types that cause the problems are shown below (assume that the interface is IATLObj and the ATL class that is implementing the interface is CATLObj):

For instance, the following are wizard-generated function prototypes in the .h file:

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

The correct declarations for header file should be:

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

The correct definitions for source file should be:

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

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

You will notice that if you use the above method, the Class view information in the Tree view may look different for CATLObj. Test and Test2 will not be in the IATLObj interface section in Class view for CATLObj as they were before. They are now in the member function section. You can correct this behavior by not making the changes above; and instead, using a macro. To do this, make the following modifications to the header file before the class definition:

   #define SAFEARRAY(X) SAFEARRAY*
				

Class view will now properly display the new methods under the interface section instead of under the member function section.