www.pudn.com > windows2000XP_WDM_DeviceDriverDevelopment_WuAnHe_C > CharFilterDll.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 FILTERDLL_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
// FILTERDLL_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef FILTERDLL_EXPORTS
#define FILTERDLL_API __declspec(dllexport)
#else
#define FILTERDLL_API __declspec(dllimport)
#endif
extern "C" {
FILTERDLL_API DWORD Install(void);
FILTERDLL_API DWORD Uninstall(void);
}