C / C++ / MFC

struct filter
{
	unsigned Bus	: 3;	// range : 0 - 7
	unsigned Route	: 5;	// range : 0 - 31
	unsigned Xmit	: 1;	// range : 0 - 1	// constraint: exclusive with Rcv
	unsigned Rcv	: 1;	// range : 0 - 1	// constraint: exclusive with Xmit
	unsigned Msg	: 5;	// range : 0 - 31
	unsigned dummy	: 1;	// padding to 16 bits
};

Alan Balkany wrote:

But the immediate problem is how to get the extern "C" attribute on a method.

extern "C" 
{
  class Vdr
  {
  public:
    __declspec (dllexport) 
    int add (int a, int b);
  };
}

BitmapInfo bi = new BitmapInfo ();   // This is the object we want to pass.
IntPtr ptr = (IntPtr) (&bi);         // Get address (needs unsafe mode).

CppFunction (ptr);                   // Pass address of object to C++.

Alan Balkany wrote:

I'm trying to make a C++ DLL with non-decorated method names that can be called from .NET.