typedef struct _PRINTER_NOTIFY_INFO_DATA {
    WORD Type;
    WORD Field;
    DWORD Reserved;
    DWORD Id;
    union {
        DWORD adwData[2];
        struct {
            DWORD  cbBuf;
            LPVOID pBuf;
        } Data;
    } NotifyData;
} PRINTER_NOTIFY_INFO_DATA, *PPRINTER_NOTIFY_INFO_DATA, *LPPRINTER_NOTIFY_INFO_DATA;