HOW TO：包裝原生類別以便讓 C# 使用

更新：2007 年 11 月

這個範例是示範如何包裝原生 C++ 類別，好讓以 C# 或其他 .NET 語言撰寫的程式碼可以使用。

範例

// wrap_native_class_for_mgd_consumption.cpp
// compile with: /clr /LD
#include <windows.h>
#include <vcclr.h>
#using <System.dll>

using namespace System;

class UnmanagedClass {
public:
   LPCWSTR GetPropertyA() { return 0; }
   void MethodB( LPCWSTR ) {}
};

public ref class ManagedClass {
public:
   // Allocate the native object on the C++ Heap via a constructor
   ManagedClass() : m_Impl( new UnmanagedClass ) {}
   
   // Deallocate the native object on a destructor
   ~ManagedClass() {
      delete m_Impl;
   }

protected:
   // Deallocate the native object on the finalizer just in case no destructor is called
   !ManagedClass() {
      delete m_Impl;
   }

public:
   property String ^  get_PropertyA {
      String ^ get() {
         return gcnew String( m_Impl->GetPropertyA());
      }
   }

   void MethodB( String ^ theString ) {
      pin_ptr<const WCHAR> str = PtrToStringChars(theString);
      m_Impl->MethodB(str);
   }

private:
   UnmanagedClass * m_Impl;
};

請參閱

參考

使用 C++ Interop (隱含 PInvoke)