hdr

The standard notification message header. hdr.idFromcontains the notification's unique identifier ( dwID); hdr.codeis one of the following values.

Value	Description
SHNN_LINKSEL	pszLinkcontains the link text of the choice that was selected.
SHNN_DISMISS	fTimeoutis TRUE if duration expired, FALSE if user tapped away.
SHNN_SHOW	ptcontains the point to which the bubble points.
SHNN_NAVLEFT	Toast stack left spinner clicked, D-pad left action.
SHNN_NAVRIGHT	Toast stack right spinner clicked, D-pad right action.
SHNN_VIEWITEM	Toast D-pad action.
SHNN_INITMENU	Indicates menu coming up, and that hMenu is in lParam.
SHNN_ICONCLICKED	ptcontains the coordinates of the point where the user clicked.

lParam

The lParamfor the notification.

dwReturn

A return value to pass back to the notification handler (SHNN_LINKSEL only).

pszLink

Contains the link text of the choice that was selected (SHNN_LINKSEL only).

fTimeout

Is TRUE if the notification's timeout duration expired; FALSE if the user dismissed the notification some other way, such as by tapping elsewhere (SHNN_DISMISS only).

pt

Contains the point to which the bubble references (SHNN_SHOW only).

WM_NOTIFY messages are sent to the window registered as the sink window when the notification was added. The lParamof the WM_NOTIFY message contains a pointer to this NMSHNstructure.

A message is sent to the sink window with hdr.codeequal to SHNN_SHOW just before the notification handler shows the notification bubble. The member ptcontains the point to which the stem of the notification bubble references. The sink window can return 0 from the window procedure to tell the notification handler not to display the notification bubble. Otherwise, it should return 1.

A message is sent to the sink window with hdr.codeequal to SHNN_LINKSEL when a link is tapped in the notification bubble (that is not of the form <A HREF="cmd:#"></A>). For this message, pszLinkcontains a pointer to the link text for the selected link. The sink window can specify a return value by placing it into dwReturnand returning 1 from the message processing. Otherwise, it should just return 0 and the default return value will be used. This is used to prevent the notification handler from removing the notification after the link is selected; set dwReturnto IDCANCEL to do this.

A message is sent to the sink window with hdr.codeequal to SHNN_DISMISS when the bubble goes away. The fTimeoutmember is equal to TRUE if the notification bubble's timeout duration expired, and FALSE if it is going away for some other reason, such as the user link selection or tapping elsewhere.