Need for Rebasing a DLL

// 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 DLL1_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 
// DLL1_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef DLL1_EXPORTS
#define DLL1_API __declspec(dllexport)
#else
#define DLL1_API __declspec(dllimport)
#endif

// This class is exported from the Dll1.dll
class DLL1_API CDll1 {
public:
	CDll1(void);
	// TODO: add your methods here.
};

extern DLL1_API int nDll1;

DLL1_API int fnDll1(void);