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_IUccPlatformEvents.OnIpAddrChange Method

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Raised when the network address of the local client is changed.

Namespace: Microsoft.Office.Interop.UccApi
Assembly: Microsoft.Office.Interop.UccApi (in

void OnIpAddrChange (
	UccPlatform pEventSource,
	Object pEventData
void OnIpAddrChange (
	UccPlatform pEventSource, 
	Object pEventData
function OnIpAddrChange (
	pEventSource : UccPlatform, 
	pEventData : Object



A value of the IUccPlatform* (UccPlatform, for a .NET application) type. This identifies the IUccPlatform instance in which this event is raised.


A value of the IUnknown* (object, for a .NET application) type. Currently only NULL is returned.

This event indicates that the client connection to a Unified Communications server may no longer be valid. If the IP address that changed is the primary IP address then the connection must be restored. To restore the connection, the client application must be stopped and restarted.

Win32 COM/C++ Syntax

HRESULT OnIpAddrChange
   IUccPlatform* pEventSource,
   IUnknown* pEventData
In a Win32 application, the return value of a method or property is always an HRESULT value indicating the status of the call to the interface member. Any result of the operation is returned as a parameter marked with the [out, retval] attribute. In contrast, in a .NET application the HRESULT value indicating an error condition is returned as a COM exception and the [out, retval] parameter becomes the return value. For the UCC API-defined HRESULT values, see Trace and Handle Errors in Unified Communications Client API .

The following example is an event handler for the OnIpAddrChange event raised by the platform. The event source is the instantiated platform singleton running in the client process. This event should trigger the client application to notify the user that it is necessary to shut down and restart the client application.

void _IUccPlatformEvents.OnIpAddrChange(
            UccPlatform eventSource,
            object eventData)
   // client application logic appropriate for this event handler
     "your network connection changed and will now close." + 
     System.Environment.NewLine + 
     "Please restart the application.");

All public static (Shared in Visual Basic) members of this type are thread-safe. Instance members are not guaranteed to be thread-safe.

Development Platforms

Windows XP Professional with Service Pack 2 (SP2), Windows Server 2000 with Service Pack 4, Windows Server 2003, Windows Vista Ultimate Edition, Windows Vista Business Edition, Windows Vista Enterprise Edition

Target Platforms