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

DONGLE_API BOOL DongleCheck(void);