如何爲GetDelegateForFunctionPointer系統指定調用的類型：Func？

Question

任務將System :: Func的回調類型傳遞給非託管函數。

//c++ clr 

     class Unmanagement 
     { 
      void Test() 
      { 
      Marshal::GetDelegateForFunctionPointer(callback,);//<----how to specify the type? 
      } 
      IntPtr callback; 
     } 

     bool Init(Func<IntPtr, Int32, Int32,Int32>^ callback) 
     { 
      Unmanagement a=new Unmanagement; 
      IntPtr cb=Marshal::GetFunctionPointerForDelegate(callback); 
      a->callback=cb; 
     } 

Answer 1

Func<IntPtr, Int32, Int32, Int32>::typeid？