Utilisation DLL C# à partir d'une dll C++ (non managé)

// COMClient.cpp
// Build with "cl COMClient.cpp"
// arguments: friend

#include <windows.h>
#include <stdio.h>

#pragma warning (disable: 4278)

// To use managed-code servers like the C# server, 
// we have to import the common language runtime:
#import <mscorlib.tlb> raw_interfaces_only

// For simplicity, we ignore the server namespace and use named guids:
#if defined (USINGPROJECTSYSTEM)
#import "..\RegisterCSharpServerAndExportTLB\CSharpServer.tlb" no_namespace named_guids
#else  // Compiling from the command line, all files in the same directory
#import "CSharpServer.tlb" no_namespace named_guids
#endif
int main(int argc, char* argv[])
{
   IManagedInterface *cpi = NULL;
   int retval = 1;

   // Initialize COM and create an instance of the InterfaceImplementation class:
   CoInitialize(NULL);
   HRESULT hr = CoCreateInstance(CLSID_InterfaceImplementation,
               NULL, CLSCTX_INPROC_SERVER,
               IID_IManagedInterface, reinterpret_cast<void**>(&cpi));

   if (FAILED(hr))
   {
      printf("Couldn't create the instance!... 0x%x\n", hr);
   }
   else
   {
      if (argc > 1)
      {
         printf("Calling function.\n");
         fflush(stdout);
         // The variable cpi now holds an interface pointer 
         // to the managed interface.
         // If you are on an OS that uses ASCII characters at the 
         // command prompt, notice that the ASCII characters are 
         // automatically marshaled to Unicode for the C# code.
         if (cpi->PrintHi(argv[1]) == 33)
            retval = 0;
         printf("Returned from function.\n");
      }
      else
         printf ("Usage:  COMClient <name>\n");
      cpi->Release();
      cpi = NULL;
   }

   // Be a good citizen and clean up COM:
   CoUninitialize();
   return retval;
}