I created a COM-interop .dll with this simple class:
using System.Runtime.InteropServices;
namespace ClassLibrary1
{
[ComVisible(true)]
[Guid("795ECFD8-20BB-4C34-A7BE-DF268AAD3955")]
public interface IComWeightedScore
{
int Score { get; set; }
int Weight { get; set; }
}
[ClassInterface(ClassInterfaceType.None)]
[Guid("9E62446D-207D-4653-B60B-E624EFA85ED5")]
public class ComWeightedScore : IComWeightedScore
{
private int _score;
public int Score
{
get { return _score; }
set { _score = value; }
}
private int _weight;
public int Weight
{
get { return _weight; }
set { _weight = value; }
}
public ComWeightedScore()
{
_score = 0;
_weight = 1;
}
}
}
I registered it using:
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\regasm C:\ComClasses\Classlibrary1.dll /tlb: Classlibrary1.tlb
Finally I succesfully added a reference to the .dll after which VB6 gave me intellisense on the object.
Private Sub Form_Load()
Dim score1 As ComWeightedScore
Set score1 = New ComWeightedScore
score1.Score = 500
End Sub
On the line Set score1=new ComWeightedScore
the exception Automation Error is raised.
It can hardly be any simpler than this… Where is the error?!
Best Answer
You forgot the /codebase option in the Regasm.exe command line.
Without it, you'll have to strong-name the assembly and put it in the GAC with gacutil.exe. Good idea on the client machine, just not on yours.