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;