I need to utilize in managed code some security functions from secur32.dll.
To do this,  i have to call 'InitSecurityInterface' function, which returns
a
pointer to a 'SecurityFunctions' struct. This struct have pointers to the
secure methods.

I've defined:

   [DllImport("secur32.dll")]
   static extern IntPtr InitSecurityInterfaceA();

and

   [StructLayout(LayoutKind.Sequential)]
   public struct SecurityFunctions
   {
           public ulong dwVersion;
           public IntPtr EnumerateSecurityPackages;
           public IntPtr QueryCredentialsAttributes;
           .......
   }

Now, my initialization code looks like:

   IntPtr functionsPointer = InitSecurityInterface();
   SecurityFunctions funcs = (SecurityFunctions)
Marshal.PtroToStructure(functionsPointer, typeof(SecurityFunctions));

And i cannot go beyond this. How can i invoke, as example,
"funcs.EnumerateSecurityPackages(...)" method. It have
it's own signature. I've investigated System.Reflection.Emit because
TypeBuilder have the "DefinePInvokeMethod",
but i cannot find how link this dynamic methods with the fixed address that
i have in "SecurityFunctions" structure.

Can anybody help me?

Thanks in advance.

Federico