?
Solved

Control panel application

Posted on 2004-08-06
4
Medium Priority
?
999 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
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 360 total points
ID: 11738798
0

Featured Post

Vote for the Most Valuable Expert

It’s time to recognize experts that go above and beyond with helpful solutions and engagement on site. Choose from the top experts in the Hall of Fame or on the right rail of your favorite topic page. Look for the blue “Nominate” button on their profile to vote.

Question has a verified solution.

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

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
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…
Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day. …
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
Suggested Courses
Course of the Month15 days, 13 hours left to enroll

850 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