Called by the framework when Excel closes the XLL
[C++]
virtual void OnXllClose();
This function is called whenever a user unloads the add-in,
whether using the Excel Tools - Add-ins dialog or indirectly, when closing Excel. This is a good time to do any termination and cleanup that needs to follow
any use of your add-in functions, particularly closing databases and logging off data feeds. The default implementation of this function does nothing.
Header: xllplus.h
CXllApp Class
| CXllApp Methods
| CXllApp::OnXllOpenEx()
| CXllApp::OnXllOpen()