Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

"Invalid class reference" error executing control panel applet

Posted on 2004-09-25
2
Medium Priority
?
773 Views
Last Modified: 2010-04-16
Started a Control Panel Application in Delphi 7, setting icon, title and description. Created a Form window and set unit1(applet module) to use unit2 (Form). Runs the following code on applet activation:

with TForm2.Create(nil) do
try
  ShowModal
finally
  Free
end;

Installed the applet and launched Control Panel which produces 3 identical application errors:

Exception EAppletException in module Project1.cpl at 00022DD2.
Invalid class reference for TAppletApplication.

Double-clicking the applet icon from control panel produces the error once more before displaying form2 successfully. I don't think I'm trying to do anything special here, so hopefully I am missing something really obvious!

Thanks, J.
0
Comment
Question by:seizures
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 6

Accepted Solution

by:
vadim_ti earned 1000 total points
ID: 12152318
Your Form2 is autocreated in your Project file (DPR)
delete or comment  string

 Application.CreateForm(TForm2, Form2);

in your .DPR file
0
 

Author Comment

by:seizures
ID: 12153948
That did the trick. It was driving me mad so thank you very much.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Suggested Courses

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question