http://msdn.microsoft.com/en-us/library/bb787585(v=VS.85).aspx SB_HORZ Retrieves the position of the scroll box in a window's standard horizontal scroll bar.水平
SB_VERT Retrieves the position of the scroll box in a window's standard vertical scroll bar.垂直
SB_HORZ Retrieves the position of the scroll box in a window's standard horizontal scroll bar.水平
SB_VERT Retrieves the position of the scroll box in a window's standard vertical scroll bar.垂直
GetScrollPos是对滚动条的,要调用的话还是要得到滚动条句柄;
直接对listview调用,又没法区分横还是竖