A simple C# ActiveX COM dll

[Joe Caverly]

This is a method of creating a 32-bit ActiveX COM dll from the command line,
without the need to use Visual Studio.

This 32-bit ActiveX COM dll can then be used from;

Powershell
thinBasic
VBScript
Visual Basic 6.0
Visual FoxPro 9.0

...and other 32-bit applications.

Here's the C# source for SimpleComDLL.cs

using System;
using System.Runtime.InteropServices;

namespace SimpleComDll
{
    [ComVisible(true)]
    [Guid("E7A9A5C7-3B6D-4C6A-9B7A-2B5D5F5D5F5D")]
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    public interface ISimpleComClass
    {
        void ShowMessage(string message);
        double PPP(double PPK); // Adding PPP function to the interface
    }

    [ComVisible(true)]
    [Guid("D7A9A5C7-3B6D-4C6A-9B7A-2B5D5F5D5F5D")]
    [ClassInterface(ClassInterfaceType.None)]
    public class SimpleComClass : ISimpleComClass
    {
        public void ShowMessage(string message)
        {
            Console.WriteLine(message);
        }
        
        public double PPP(double PPK)
        {
            return PPK * 0.454; // Implementing PPP function
        }
    }
}

Review the source code for 32bit.btm for detailed instructions on how to create the 32-bit ActiveX COM dll.

Here's a thinBasic usage example;

Uses "Console"

dim Cs as iDispatch
dim result as String

CS = CreateObject("SimpleComDll.SimpleComClass")

If IsComObject(cs) then
  result = cs.PPP(6.59)

  printl result
  
Else
  Printl "Could not create SimpleComDll.SimpleComClass object"
end if

cs = Nothing

Joe