Структура для оповещения.
typedef struct _tagSCREADERS_SCANER_PROC_PARAM
{
	HWND					hWnd;
	DWORD					dwReadersCount;
	LPSCARD_READERSTATE			lpReaderState;

	UINT					nMessage;
	WPARAM				wpCardPutInValue;
	WPARAM				wpCardTakeOutValue;
	HANDLE*					lphExitEvent;
} SCREADERS_SCANER_PROC_PARAM, *LP_SCREADERS_SCANER_PROC_PARAM;