Solved

Control panel application

Posted on 2004-08-06
4
988 Views
Last Modified: 2011-10-03
How is it possible in Delphi to make a .cpl file? and how could you make your standard Delphi program run with that extension?
0
Comment
Question by:KLOPEKS
[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
4 Comments
 
LVL 12

Expert Comment

by:andrewjb
ID: 11733664
You got Delphi pro? Don't you just do "New" and choose 'Control Panel appliction' of the 'Other' options somewhere?
0
 
LVL 17

Expert Comment

by:Wim ten Brink
ID: 11734149
andrewjb is right. Use File|New|Control Panel Application

When you create a new CPL project, you get a TAppletModule which is a kind of data module with special events to support a control panel. You can even add more of those panels if you like. Control Panel Applications have a special entry point called "CPlApplet" which is required.

Let's quote cpl.pas:
--------Start quote
General rules for being installed in the Control Panel:
      1) The DLL must export a function named CPlApplet which will handle the messages discussed below.
      2) If the applet needs to save information in CONTROL.INI minimize clutter by using the application name [MMCPL.appletname].
      3) If the applet is refrenced in CONTROL.INI under [MMCPL] use the following form:
              ...
              [MMCPL]
              uniqueName=c:\mydir\myapplet.dll
              ...
  The order applet DLL's are loaded by CONTROL.EXE is:
      1) MAIN.CPL is loaded from the windows system directory.
      2) Installable drivers that are loaded and export the CplApplet() routine.
      3) DLL's specified in the [MMCPL] section of CONTROL.INI.
      4) DLL's named *.CPL from windows system directory.

 CONTROL.EXE will answer this message and launch an applet

 WM_CPL_LAUNCH
      wParam      - window handle of calling app
      lParam      - LPTSTR of name of applet to launch

 WM_CPL_LAUNCHED
      wParam      - TRUE/FALSE if applet was launched
      lParam      - NULL

 CONTROL.EXE will post this message to the caller when the applet returns (ie., when wParam is a valid window handle)
--------End quote

In Delphi, the related units are CPL and CtlPanel. It is possible to make an executable that runs both as stand-alone exe and as CPL application but in general it's better to split this functionality. But if you really want to do this, create a CPlApplet according to above syntax and export it. Rename the exe to .cpl or include {$E cpl} in your project source.
0
 

Author Comment

by:KLOPEKS
ID: 11735532
I'm not to familiar with Control Panel Application, but i have an existing program that i would like to run as one, so do i make a dll, or add my current code to a CPlApplet ?  
0
 
LVL 18

Accepted Solution

by:
Johnjces earned 120 total points
ID: 11738798
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone 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 Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
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…
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

688 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