When a COM Add-in is installed on a user's system, registry entries are created for the Add-in. All COM Add-ins must implement each of the five methods of this interface: OnConnection, OnStartupComplete, OnAddinsUpdate, OnBeginShutDown, and OnDisconnection. COM Add-in functions cannot be directly called from cell formulas in worksheets.Ī COM Add-in is an in-process COM server (an ActiveX DLL) that must implement the IDTExensibility2 interface. COM Add-ins are typically used to automate Excel in response to a click of a CommandBar button, a form or dialog box, or some other event specific to Excel such as opening or closing workbooks or entering data on worksheets. More Information COM Add-insĬOM Add-ins present the developer with a way to extend the functionality of Office applications for custom tasks. This article explains the differences between these two types of Add-ins. ![]() ![]() Microsoft Office Excel support Automation Add-ins in addition to Component Object Model (COM) Add-ins. ![]() Excel COM add-ins and Automation add-ins Summary
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