EN_HSCROLL  2XZH9XG 

The EN_HSCROLL notification message is sent when the user clicks an edit control s horizontal scroll bar. The parent window of the edit control receives this notification message through the WM_COMMAND message. The parent window is notified before the screen is updated.

EN_HSCROLL

idEditCtrl = (int) LOWORD(wParam); // identifier of edit control

hwndEditCtrl = (HWND) lParam;      // handle of edit control

See Also