Solved

"Invalid class reference" error executing control panel applet

Posted on 2004-09-25
2
756 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
2 Comments
 
LVL 6

Accepted Solution

by:
vadim_ti earned 250 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

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
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…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
In this video I am going to show you how to back up and restore Office 365 mailboxes using CodeTwo Backup for Office 365. Learn more about the tool used in this video here: http://www.codetwo.com/backup-for-office-365/ (http://www.codetwo.com/ba…

920 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

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now