reflected-window-message-ids.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: Reflected Window Message IDs	Reflected Window Message IDs	11/04/2016	OCM_CTLCOLORBTN OCM_PARENTNOTIFY OCM_VKEYTOITEM OCM_CTLCOLORSTATIC OCM_HSCROLL OCM_CHARTOITEM OCM_DRAWITEM OCM_MEASUREITEM OCM_COMPAREITEM OCM_COMMAND OCM_NOTIFY OCM_CTLCOLORMSGBOX OCM_DELETEITEM OCM_CTLCOLORLISTBOX OCM_CTLCOLORDLG OCM_CTLCOLOREDIT OCM_CTLCOLORSCROLLBAR OCM_VSCROLL OCM_CTLCOLOR	OCM_HSCROLL message [MFC] OCM_PARENTNOTIFY message [MFC] messages, reflected reflected messages, window message Ids OCM_CTLCOLORDLG message [MFC] OCM_COMMAND message [MFC] OCM_CTLCOLORMSGBOX message [MFC] OCM_COMPAREITEM message [MFC] OCM_DRAWITEM message [MFC] OCM_VSCROLL message [MFC] OCM_CTLCOLOREDIT message [MFC] OCM_VKEYTOITEM message [MFC] OCM_CHARTOITEM message [MFC] OCM_CTLCOLORBTN message [MFC] OCM_CTLCOLORSTATIC message [MFC] OCM_MEASUREITEM message [MFC] OCM_CTLCOLOR message [MFC] OCM_CTLCOLORSCROLLBAR message [MFC] OCM_ messages OCM_DELETEITEM message [MFC] OCM_CTLCOLORLISTBOX message [MFC] OCM_NOTIFY message [MFC] reflected messages	3417ff51-ff9f-458c-bff4-17c200f00d96

Reflected Window Message IDs

A quick way to create an ActiveX control, or other specialized control, is to subclass a window. For more information, see MFC ActiveX Controls: Subclassing a Windows Control.

To prevent the control's container from receiving the window messages sent by a subclassed Windows control, COleControl creates a "reflector" window to intercept certain window messages and send them back to the control. The control, in its window procedure, can then process these reflected messages by taking actions appropriate for an ActiveX control.

The following table shows the messages that are intercepted and the corresponding messages that the reflector window sends.

Message sent by the control	Message reflected to the control
WM_COMMAND	OCM_COMMAND
WM_CTLCOLORBTN	OCM_CTLCOLORBTN
WM_CTLCOLOREDIT	OCM_CTLCOLOREDIT
WM_CTLCOLORDLG	OCM_CTLCOLORDLG
WM_CTLCOLORLISTBOX	OCM_CTLCOLORLISTBOX
WM_CTLCOLORSCROLLBAR	OCM_CTLCOLORSCROLLBAR
WM_CTLCOLORSTATIC	OCM_CTLCOLORSTATIC
WM_DRAWITEM	OCM_DRAWITEM
WM_MEASUREITEM	OCM_MEASUREITEM
WM_DELETEITEM	OCM_DELETEITEM
WM_VKEYTOITEM	OCM_VKEYTOITEM
WM_CHARTOITEM	OCM_CHARTOITEM
WM_COMPAREITEM	OCM_COMPAREITEM
WM_HSCROLL	OCM_HSCROLL
WM_VSCROLL	OCM_VSCROLL
WM_PARENTNOTIFY	OCM_PARENTNOTIFY
WM_NOTIFY	OCM_NOTIFY

Note

If the control runs on a Win32 system, there are several types of WM_CTLCOLOR* messages it may receive. For more information, see WM_CTLCOLORBTN, WM_CTLCOLORDLG, WM_CTLCOLOREDIT, WM_CTLCOLORLISTBOX, WM_CTLCOLORMSGBOX, WM_CTLCOLORSCROLLBAR, WM_CTLCOLORSTATIC.

See also

MFC ActiveX Controls: Subclassing a Windows Control
TN062: Message Reflection for Windows Controls