Message
Design: Use interfaces or an abstract base class. Define the methods that
do the data conversion in the interface / abstract base class.
For each dat conversion method, create a concrete class that either
implements the interface or sub-classes the abstract base class.
Implementation: Use packages. Each class can be in its own package. Use
an INI file setting to determine which package to load. You can export a
method in the package that creates an instance of the class and either
returns the interface or the abstract base class reference.
----- Original Message -----
From: Jeremy Coulter
To: Multiple recipients of list delphi
Sent: Tuesday, August 05, 2003 10:54 PM
Subject: [DUG]: What is the best way
Hi All.
I have got an app. that gets data from devices via the comport.
60% if not more of the data from these devices is similar or easy to deal
with, like dates and times, but other info can be specific to a device, and
i have to normalize it into a format that I want.
In times gone by, about 6-7 years ago, if not more, when I first wrote this
app., I used DLL's and depending onn teh devide you specified in an INI file
it used that DLL, which I think from memory was done via the setup, so there
was only one DLL.
BUT this was really not a good idea, as it was hard to debug and just
overall never practical.
I have thought that I could use classes this time round, once again
specifying the device type in an INI file, and then based onthat it would
know hat class to use.
But is this the best way either? I mean, if I find a device that has not got
a class for it already, then its a new EXE release.
I guess what woud be idea would be if I could load some specific functions
up at runtime, and then access them then it would only ever be a txt file or
whatever that I would need to distribute.
I thought something like Delphi WebScript, but I need to get results back to
go into a DB.
Has anyone got any Ideas? Would Classes be the best? or is there something
else I can look at?
Cheers,
Jeremy Coulter
------------------------------------------------------------------------
All email scanned with Nortons Antivirus 2003
------------------------------------------------------------------------
---------------------------------------------------------------------------
New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED]
Website: http://www.delphi.org.nz
To UnSub, send email to: [EMAIL PROTECTED]
with body of "unsubscribe delphi"
Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/
