I need to create a class that can be accessible through the classic asp's Server.CreateObject method, and that exposes 3 properties (int Width, int Height, bool Loaded) and 3 methods (void Load(string locatoin), void Resize(int width, int height), void Save(string location)). All my attempts so far has been unsuccessful.
Any help would be appreciated.
Building a .NET COM Object can be somewhat difficult.
As you haven't told us what you've tried so far, the best I can do is point you to a good step-by-step guide:
Building the object is very easy - registering it and managing the COM dependency can be quite tricky.
Your .NET project should be a class library, and your class can be a straightfoward C# / .NET CLR object:
namespace MyCompany.MyProject.Com {
public class MyObject {
public int Width { get; set; }
public int Height { get; set; }
public void Load(string location) { /* implementation here */ }
public void Resize(int width, int height) { /* implementation here */ }
}
}
Right-click your project, select Properties, Application, click Assembly Information... and ensure that "Make assembly COM-Visible" is selected at the bottom of the Assembly Information dialog.
Build your project - you should end up with MyCompany.MyProject.Com.dll in your \bin\debug\ folder.
Build a simple ASP webpage that looks like this:
<% option explicit %>
<%
dim myObject
set myObject = Server.CreateObject("MyCompany.MyProject.Com.MyObject")
myObject.Width = 20
myObject.Height = 40
%>
<html>
<head>COM Interop Demo</head>
<body>
<p>Width + Height = <%= myObject.Width + myObject.Height %></p>
</body>
</html>
Bring up that page on http://localhost/ and verify that you get "Server.CreateObject failed" the first time you try and run it.
Now register your DLL as a COM object using regasm.exe, installed with the .NET framework:
C:\>C:\Windows\Microsoft.NET\Framework\v2.0.50727\regasm.exe /tlb MyCompany.MyProject.Com.dll /codebase
Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.4927
Copyright (C) Microsoft Corporation 1998-2004. All rights reserved.
Types registered successfully
Assembly exported to 'D:\WebDlls\MyCompany.MyProject.Com.tlb', and the type library w
as registered successfully
Now refresh your web page, and you should see Width + Height = 60 in your output.
These instructions assume you're not running anything in 64-bit; if you are, it gets more complex. (You either need to run everything as 64-bit - compile a 64-bit project and use the 64-bit version of regasm.exe to register it for 64-bit COM, accessed by IIS running a 64-bit scripting host) - or manually force everything to 32-bit.