I successfully exported the following C# class and its method to COM.

namespace SRCSN
{
   [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
   public interface _SRCSAux
   {
       void DisplayDLLInfo();
   }

   [ClassInterface(ClassInterfaceType.None)]
   public class SRCSAux : _SRCSAux
   {
       public SRCSAux()
       {
       }

       public void DisplayDLLInfo()
       {
           MessageBox.Show("Hello World!");
       }
   }
}

Everything works fine when I call DisplayDLLInfo()
from an unmanaged MFC application as follows.

#import "C:\...\bin\Debug\SRCSN.tlb"
using namespace SRCSN;

SRCSN::_SRCSAuxPtr com_ptr;
CoInitialize(NULL);
SRCSN::_SRCSAuxPtr p(__uuidof(SRCSN::SRCSAux));            // OK
com_ptr = p;
com_ptr->DisplayDLLInfo();
// OK

However, exactly the same code throws an exception when executed
within an exported function in an unmanaged C++ DLL.

#define DLLExport extern "C" _declspec(dllexport)
#import "C:\...\bin\Debug\SRCSN.tlb"
using namespace SRCSN;

DLLExport BOOL Func()
{
   AFX_MANAGE_STATE(AfxGetStaticModuleState());
   SRCSN::_SRCSAuxPtr com_ptr;
   CoInitialize(NULL);
   SRCSN::_SRCSAuxPtr p(__uuidof(SRCSN::SRCSAux));        // EXCEPTION :-(
   com_ptr = p;
   com_ptr->DisplayDLLInfo();
}

What's the problem with SRCSN::_SRCSAuxPtr p(__uuidof(SRCSN::SRCSAux)) ?

Any help would be greatly appreciated.

TIA,
-Alex