After it has called QueryService to get a pointer to an interface that is part of a service, an ActiveX designer can simply call the interface through the pointer. For example, the following two lines of code get a pointer to the ICodeNavigate interface in the SCodeNavigate service (as described in the preceding section, "Finding a Service"):
hr = pClientSite->QueryInterface(IID_IServiceProvider, &pISP);
hr = pISP->QueryService(SID_SCodeNavigate, IID_ICodeNavigate, &pICN);
Assuming that the QueryService call returns without error, the following code fragment calls the DisplayDefaultEventHandler method of ICodeNavigate:
hr = pICN->DisplayDefaultEventHandler(lpMyObject);
Typically called in response to an event such as a mouse click, this method displays the default event handler for the object named in lpMyObject.