Demo Control Panel Application

Environment: Win 9x/NT/2000 and Visual C++ 6

While not being very fancy, this application (called ControlPanel) is a small demonstration of how the real Windows Control Panel functions.

When the Control Panel is launched, it looks for .cpl files in the Windows system folder. The .cpl files (called applets) are simple DLLs that export the CPlApplet function. For each applet found, the Control Panel loads that DLL with the ::LoadLibrary function call and then uses the GetProcAddress function to realize a pointer to the CPlApplet function. For each applet, it calls the CPlApplet function by passing it different messages such as CPL_INIT, CPL_INQUIRE etc. You can get help about different messages in the online help of MSDN.

When the Control Panel calls the CPlApplet function with CPL_INQUIRE message, the .cpl file returns a CPLINFO structure which holds information about that perticular applet such as its name, icon, info tip etc. When the Control Panel applet is double-clicked by the user, the CPlApplet function is called with the CPL_DBLCLK value. At this point, the applet generally displays a dialog from which the user can interact with the applet.


Download demo project - 32 KB
Download source - 46 KB


  • hardware control panel

    Posted by RAJESH KORI on 11/08/2012 10:36pm

    Dear sir/madam Since i shall be starting the production unit of A/D conversion plus Optical cable in mp khajuraho. please give the suggestion about lauched it. Thanking you

  • Local Area Connection

    Posted by Legacy on 02/24/2003 12:00am

    Originally posted by: Rens


    Is there also anyway to go direct to the Local Area Connection in windows XP? I don't want to go first to the network properties. I want to do this with C++ Builder.

  • How i can cheng sound card from control panel in vb or vc++?

    Posted by Legacy on 02/18/2003 12:00am

    Originally posted by: majid

    How i can cheng sound card from control panel in vb or vc++
    when i want record multi sound form multi sound card whit mic in program i think chang sound card from control panel
    but i dont do it. can you help me.

    thank you.

  • how to make cd rom drivers available in dos without cd rom drivers?

    Posted by Legacy on 12/22/2001 12:00am

    Originally posted by: Auleear Mohammad Yasir

    from your startup disk copy the following files to c:

    then edit config.sys and add this:
    DEVICE=Oakcdrom.sys /d:mscd001
    DEVICE=Btcdrom.sys /d:mscd001
    DEVICE=Aspicd.sys /d:mscd001

    save it

    then edit autoexec.bat and add this:
    mscdex /d:mscd001
    then save it
    restart your computer then go on pressin f8
    then select command prompt only

    the drivers for your cd rom will be enabled

    searching tips for installing linux?

    email me at

  • How can I make harddisk bootable throgth this controlpanal program?

    Posted by Legacy on 11/14/2001 12:00am

    Originally posted by: yanny

    I want to make a program that can make hard disk bootable,as do in making startup floppy disk in control panal.How "add/delete program" in control panal make this?

  • My changed email address:

    Posted by Legacy on 05/25/2001 12:00am

    Originally posted by: Farooque Khan


    My email address is
    The given is not valid.
    Thank You.

    Farooque Khan

  • Control Panel

    Posted by Legacy on 05/15/2001 12:00am

    Originally posted by: son

    Thanks for your application, i think it's really helpful. I also have a question to ask. Is there anyway that I can invoke one of the item within the pop up dialog after I double click on the one of the control panel item, for example "Printer" item. Can I programmatically execute my "LaserJet printer" without double click on the item?


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