Question

I’m a newer about COM. I want to write a plugin that locate in vs2008
toolbar(not toolbox).

I created an ATL project. It gived me some default codes. so i could generate a DLL. Through this way, I can add this plugin to ToolBox by TOOLs->choose tool items->COM components. But I want to add this into toolbar. So how should i do.

I add some regester info in rgs file, as follow:

HKCU{ NoRemove SOFTWARE   {
NoRemove Microsoft
{
  NoRemove VisualStudio
  {
    NoRemove 9.0
    {
      NoRemove AddIns
      {
        ForceRemove PiSvr.CalcPi
        {
          val CommandLineSafe  = d '0'
          val CommandPreload   = d '1'
          val Description      = s 'Sample Common Add-In'
          val FriendlyName     = s 'Sample Common Add-In'
          val LoadBehavior     = d '1'           
        }
      }
    }
  }
}  }}

But when I started the vs2008, it told me no such interface supported. error number:80004002

Answer 1

The add-in connection is in registry under HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\9.0\AddIns and your script looks like correct. Note you can always use regedit to check if the corresponding registry item is there in registry too, not just in your script.

0x80004002 is E_NOINTERFACE and what is probably taking place is that Visual Studio is trying to instantiate and initialize your add-in but it lacks a mandatory interface implemetnation, and Visual Studio aborts the attempt.

To troubleshoot this, debug your add-in and check what interfaces are queried, esp. those for which you return error code and indicate their absence.