The framework calls this member function to inform the parent window of a control that an event has occurred in the control or that the control requires some kind of information.
Identifies the control that sends the message if the message is from a control. Otherwise, wParam is 0.
Pointer to a notification message (NMHDR) structure that contains the notification code and additional information. For some notification messages, this parameter points to a larger structure that has the NMHDR structure as its first member.
Pointer to an LRESULT variable in which to store the result code if the message is handled.
An application returns nonzero if it processes this message; otherwise 0.
OnNotify processes the message map for control notification.
Override this member function in your derived class to handle the WM_NOTIFY message. An override will not process the message map unless the base class OnNotify is called.
For more information on the WM_NOTIFY message, see Technical Note 61 (TN061), ON_NOTIFY and WM_NOTIFY messages. You may also be interested the related topics described in Control Topics, and TN062, Message Reflection for Windows Controls.