WPF + C++ (DLLImport)

test.cpp--------------------------------------------

#include <stdio.h>

extern "C"
{
__declspec(dllexport) void DisplayHelloFromDLL()
 {
  printf ("Hello from DLL !\n");
 }
}
----------------------------------------------------

test.cs----------------------------------------------
using System;
using System.Runtime.InteropServices;

class HelloWorld
{
 
   [DllImport("TestLib.dll")]
   public static extern void DisplayHelloFromDLL ();

   static void Main ()
   {
     Console.WriteLine ("This is C# program");
  DisplayHelloFromDLL ();

   }

}
----------------------------------------------------
요렇게 하면 된다...젠장...
왜 삽질했을까..ㅎㅎ