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<H3 align=center><FONT color=#a0a099>Win32: Control Panel Applet
Framework</FONT></H3>
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<P>This article was contributed by <A
href="mailto:Len.Holgate@dial.pipex.com">Len Holgate</A>.<!-- Sample
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<P> <A
href="http://dialspace.dial.pipex.com/town/road/xmx04/Source/Win32/ControlPanel.htm">Download Source Code and Example</A> </P>
<P><!-- The article... --><FONT face="Times New Roman">The Windows
Control Panel
is the ideal way to allow a user to alter settings for an application
that runs
in the background, or automatically. But what <EM>are</EM> control panel
applets
and how do you write one? Well, after some exploring in the MSDN I
discovered
that control panel applets are just standard DLLs with a particular set
of entry
points and a .cpl extension. Place such a file in the Windows System
directory
and the next time you start up control panel your applet will be there.
Having
discovered what I needed to know I set about writing a control panel
applet and
once I'd done that, I turned the bulk of the code into a mini applet
framework
so I wouldn't have to write it ever again!</FONT></P>
<P><FONT face="Times New Roman">To implement your control panel applet
all you
need to do is the following: </FONT>
<UL>
<LI><FONT face="Times New Roman">include
"ControlApplet.hpp" and
publicly derive a class from CJBControlPanelApplet.</FONT>
<LI><FONT face="Times New Roman">call the CJBControlPanelApplet
constructor
and pass resource IDs for the applet's icon, name and
description.</FONT>
<LI><FONT face="Times New Roman">implement the pure virtual
function
OnDoubleClick() - this is where your applet becomes live and can
display a
dialog or whatever.</FONT>
<LI><FONT face="Times New Roman">create an instance of your applet
class at
global scope.</FONT>
<LI><FONT face="Times New Roman">link with ControlApplet.cpp and
include
ControlApplet.def in your project. ControlApplet.cpp gives you the
implementation of CJBControlPanelApplet and suitable DllMain() and
CPlApplet() DLL entry point functions.</FONT> </LI></UL>
<P>So that this article and code can be kept up to date more easily
I've
provided a link to where the article is located on my own web pages. <A
href="http://dialspace.dial.pipex.com/town/road/xmx04/Source/Win32/Cont
rolPanel.htm">Read
the full article and download the source code</A>.</P><!-- Remember to
update this -->
<P>Last updated: 27 June 1998 </P>
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<CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER>
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<DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A> </FONT></DIV>
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