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

Notes

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

Concepts

MFC ActiveX Controls: Subclassing a Windows Control

TN062: Message Reflection for Windows Controls