.NET COM Interop on Windows 7 64Bit gives me a headache

Posted by Kevin Stumpf on Stack Overflow See other posts from Stack Overflow or by Kevin Stumpf
Published on 2010-05-01T10:51:24Z Indexed on 2010/05/01 10:57 UTC
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Hey guys,

.NET COM interop so far always has been working quite nicely. Since I upgraded to Windows 7 I don't get my .NET COM objects to work anymore.

My COM object is as easy as:


namespace Crap
{
    [ComVisible(true)]
    [Guid("2134685b-6e22-49ef-a046-74e187ed0d21")]
    [ClassInterface(ClassInterfaceType.None)]
    public class MyClass : IMyClass
    {

        public MyClass()
        {}

        public void Test()
        {
            MessageBox.Show("Finally got in here.");
        }

    }
}



namespace Crap
{
    [Guid("1234685b-6e22-49ef-a046-74e187ed0d21")]
    public interface IMyClass
    {

    }
}


assembly is marked ComVisible as well.

I register the assembly using

regasm /codebase /tlb "path"

registers successfully (admin mode). I tried regasm 32 and 64bit. Both time I get the error

"ActiveX component cant create object Crap.MyClass" using this vbscript:


dim objReg
Set objReg = CreateObject("Crap.MyClass")
MsgBox typename(objReg)

fuslogvw doesn't give me any hints either. That COM object works perfectly on my Vista 32 Bit machine.

I don't understand why I haven't been able to google a solution for that problem.. am I really the only person that ever got into that problem?

Looking at OleView I see my object is registered successfully. I am able to create other COM objects as well.. it only does not work with my own ones.

Thank you, Kevin

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