Introduction - If you have any usage issues, please Google them yourself
(Using the scroll bar) in the P124 program sysmets2.c on the basis of the following functions: 1) modeled on the vertical scroll bar to achieve functional, so the window has a horizontal scroll bar 2) to respond to the scroll bar message: SB_LINEUP, SB_LINELEFT, SB_LINEDOWN, SB_LINERIGHT , SB_PAGEUP, SB_PAGELEFT, SB_PAGEDOWN, SB_PAGERIGHT, SB_THUMBTRACK, SB_TOP, SB_LEFT, SB_BOTTOM, SB_RIGHT