typedef struct tagSCROLLBARINFO
{
    DWORD cbSize;
    RECT rcScrollBar;
    int dxyLineButton;
    int xyThumbTop;
    int xyThumbBottom;
    int reserved;
    DWORD rgstate[CCHILDREN_SCROLLBAR + 1];
} SCROLLBARINFO, *PSCROLLBARINFO, *LPSCROLLBARINFO;