This message is sent when the clipboard contains a data handle for the CF_OWNER-DISPLAY format (specifically the clipboard owner should display the clipboard contents) and an event occurs in the clipboard application's horizontal scroll bar.
| Parameter | Description |
| wParam | Contains a handle to the clipboard application window. | ||
| lParam | Contains one of the following scroll-bar codes in the low-order word: | ||
| Value | Meaning | ||
| SB_BOTTOM | Scroll to lower right. | ||
| SB_ENDSCROLL | End scroll. | ||
| SB_LINEDOWN | Scroll one line down. | ||
| SB_LINEUP | Scroll one line up. | ||
| SB_PAGEDOWN | Scroll one page down. | ||
| SB_PAGEUP | Scroll one page up. | ||
| SB_THUMBPOSITION | Scroll to absolute position. | ||
| SB_TOP | Scroll to upper left. | ||
| The high-order word of the lParam parameter contains the thumb position if the scroll-bar code is SB_THUMBPOSITION. Otherwise, the high-order word is not used. | |||
The clipboard owner should use the InvalidateRect function or repaint as desired. The scroll-bar position should also be reset.