Home/ Questions/Q 5994603
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-22T23:50:28+00:00

I have the following interface. The interface returns ISystemCmds interface as part of GetSystemCommandInterface

  • 0

I have the following interface. The interface returns ISystemCmds interface as part of GetSystemCommandInterface method. We are using ATL for creating the COM. 

interface IDevice : IDispatch{  
 [id(1), helpstring("method Connect")] HRESULT Connect([in] VARIANT varPortNo);    
 [id(2), helpstring("method GetSystemCommandInterface")] HRESULT GetSystemCommandInterface([out,retval] ISystemCmds** pISystemCmd);    
};

What code should add (and where) for creating the COM object for ISystemCmds if

a. I am creating the COM object for ISystemCmds as part of COM object creation of IDevice?
b. I am creating the COM object in GetSystemCommandInterface() method?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Use the ATL wizard to create the implementation of ISystemCmds. Then create the object through normal CoCreateInstance, or use the CComObject<> template (see method CreateInstance) if you need to initialize the object in a way that ISystemCmds does not support. Be aware that CComObject<>::CreateInstance() does not AddRef() your object like QueryInterface() and CoCreateInstance() do. AddRef the object before passing it along!

    • 0