About Drag List Box Messages

A drag list box notifies its parent window of drag events by sending it a drag list message. The parent window must process the drag list message.

The drag list box registers the drag list message when the MakeDragList function is called. To get the message identifer (numeric value) of the drag list message, you must call the RegisterWindowMessage function, specifying the DRAGLISTMSGSTRING value.

The wParam parameter of the drag list message is the control identifier for the drag list box. The lParam parameter is the pointer to a DRAGLISTINFO structure, which contains the notification code for the drag event and other information. The return value of the message depends on the notification.

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