title: ATL COM to add a function to excel
body: <p>I'm trying to build an ATL COM with a c++ class and add it to excel by automation. I found some guides but I have many problems, one is that my dll donesn't compare in automation and if I try to add it excel says there's a problem about not contain a server or there aren't permissions. Could someone give me a guide? I'm using Visual Studio 2012. Thanks.</p>