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Notifications

Notifications are the messages that sent to a parent window of the IM client application and notify about any events initiated by the IM server. Notifications deliver information on incoming and forwarded instant messages, changes in the user's Contact List, adding/removing assigned messaging groups, changing group permissions, etc. The handle to the window of the application that should receive these notifications is set through the IServerClientVB::Initialize function call.

Notifications are sent in the form of NOTIFY_SERVER_MESSAGE message.

Protected Overridable Sub WndProc (ByRef m As System.Windows.Forms.Message)
Used parameters:
(m.HWnd) hParentWnd (m.Msg) uiMessage, (m.WParam) wParam (m.LParam) lParam

Parameters

hParentWnd
Handle to a destination window. It should be passed as parameter to IServerClientVB::Initialize method on initializing interface and point to a form handle that will receive notifications from the IM server.
uiMessage
Identifier of the message that is always equal VBNotification.NOTIFY_SERVER_MESSAGE.
wParam
Identifier of the notification message. See available notification messages in the table below.
lParam
Contains additional information and data depending on the notification message.

Return Value

The return value specified by m.Result variable is ignored except for notification messages that specify otherwise.

The constants below are defined withinn VBNotification enum defined in the CSCLIENTLib workspace.

Notification Messages passed through wParam variable

AccountPasswordResetNotifies the IM client application current user's password has been reset on the IM server.
ContactStatusNotifies the IM client application some user's presence status from the Contact List and/or group contacts has been changed.
ContactListAddedNotifies the IM client application that new contacts are available to current user on the IM server.
ContactListChangedNotifies the IM client application that the list of contacts available to current user on the IM server has been changed.
ContactListNeedsToBeRebuiltNotifies the IM client application that the user's contacts have been reset due to major changes in the users structure on the IM server.
ContactListRebuiltNotifies the IM client application that the user's contacts have been rebuilt on the IM server and must be received again.
GroupAddedNotifies the IM client application that current user has been added (assigned) to specified messaging group.
GroupChangedNotifies the IM client application that assigned messaging group has been renamed and/or it's permissions have been changed.
GroupRemovedNotifies the IM client application that current user has been removed (unassigned) from specified messaging group.
MessageTypingEventNotifies the IM client application that remote user is typing a message.
NewMessageNotifies the IM client application on a new incoming instant message.
SessionClosedNotifies the IM client application that the connection with the IM server has been lost and the session has been closed. This can be a result of network issues or the IM server forcefully closes the session.
SessionClosedAsExistingNotifies the IM client application that the connection with the IM server has been automatically interrupted and the session has been closed. This can be a result of another connection to the IM server made under the same user account.
SessionPingPongNotifies the IM client application that the IM server checks a live status of the application. The IM client may bypass this notification message.

Example

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)     If m.Msg = VBNotification.NOTIFY_SERVER_MESSAGE Then         Select Case m.WParam.ToInt32()             Case VBNotification.SessionPingPong         End Select     End If     MyBase.WndProc(m) End Sub