How to Marshal a C++ Class

#ifndef __ExampleUnmanagedDLL_h__
#define __ExampleUnmanagedDLL_h__

// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the EXAMPLEUNMANAGEDDLL_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// EXAMPLEUNMANAGEDDLL_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifdef EXAMPLEUNMANAGEDDLL_EXPORTS
	#define EXAMPLEUNMANAGEDDLL_API __declspec(dllexport)
#else
	#define EXAMPLEUNMANAGEDDLL_API __declspec(dllimport)
#endif


class EXAMPLEUNMANAGEDDLL_API CUnmanagedTestClass
{
public:
	CUnmanagedTestClass();
	virtual ~CUnmanagedTestClass();
	void PassInt(int nValue);
	void PassString(char* pchValue);
	char* ReturnString();
};

#endif	// __ExampleUnmanagedDLL_h__