Mixing .NET and native code

// 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 ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_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 
// ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API functions as being imported from a DLL, whereas this DLL sees symbols
// defined with this macro as being exported.
#ifdef ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_EXPORTS
   #define ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API __declspec(dllexport)
#else
   #define ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API __declspec(dllimport)
#endif

// This class is exported from the AdR.Samples.CLRCallingNative.NativeDLL.dll
class ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API CPerson {
public:
   // Initialization
   CPerson(LPCTSTR pszName, SYSTEMTIME birthDate);
   // Accessors
   unsigned int get_Age();

private:
   TCHAR m_sName[64];
   SYSTEMTIME m_birthDate;

   CPerson();
};


#ifdef __cplusplus
extern "C" {
#endif

extern ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API int nAdRSamplesCLRCallingNativeNativeDLL;

ADRSAMPLESCLRCALLINGNATIVENATIVEDLL_API int fnAdRSamplesCLRCallingNativeNativeDLL(void);

#ifdef __cplusplus
}
#endif