Thread: Scroll Bars

You can set the range of a scroll bar using SetScrollInfo. You respond to movement by handling the WM_HSCROLL or WM_VSCROLL messages depending on whether the scroll bar is horizontal or vertical. This is slightly complicated, as you have to manually update the position. There is an example at MSDN:

Code:

    case WM_HSCROLL:
    {
         SCROLLINFO si     = { 0 };
         int        oldPos = 0;

         si.cbSize = sizeof (si);
         si.fMask  = SIF_ALL;
         GetScrollInfo (hwnd, SB_HORZ, &si);

         // Save the position for comparison later on
         oldPos = si.nPos;

         switch (LOWORD (wParam))
         {
             // user clicked left arrow
             case SB_LINELEFT: 
                 si.nPos -= 1;
                 break;
              
             // user clicked right arrow
             case SB_LINERIGHT: 
                 si.nPos += 1;
                 break;
              
             // user clicked the scroll bar shaft left of the scroll box
             case SB_PAGELEFT:
                 si.nPos -= si.nPage;
                 break;
              
             // user clicked the scroll bar shaft right of the scroll box
             case SB_PAGERIGHT:
                 si.nPos += si.nPage;
                 break;
              
             // user dragged the scroll box
             case SB_THUMBTRACK: 
                 si.nPos = si.nTrackPos;
                 break;
              
             default:
                 break;
         }

         // Set the position and then retrieve it.  Due to adjustments
         //   by Windows it may not be the same as the value set.
         si.fMask = SIF_POS;
         SetScrollInfo (hwnd, SB_HORZ, &si, TRUE);
         GetScrollInfo (hwnd, SB_HORZ, &si);
         
         if (si.nPos != oldPos)
         {
             // If the position has changed, use the new value
         }

         return 0;
    }

However, instead of using a scroll bar, I would strongly suggest you use a trackbar control.

As far as I know, you haven't offended anybody, some questions just slip by.