testdll.h

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

// This class is exported from the TestDll.dll
class TESTDLL_API CTestDll {
public:
	CTestDll(void);
	// TODO: add your methods here.
};

extern TESTDLL_API int nTestDll;

TESTDLL_API int fnTestDll(void);

__declspec(dllexport) int Add(int n1, int n2);
__declspec(dllexport) int Sub(int n1, int n2);
__declspec(dllexport) int Mul(int n1, int n2);
__declspec(dllexport) int Div(int n1, int n2);