RE: [Jposloader-discuss] Where to start developing a JavaPOS syst em?

[Lange, J. <La...@Ul...>]

Kin,
   I agree that at first glance JavaPOS and the JCL can be rather confusing.
but once you understand the concept of it, it is rather easy.  One good
place to look is at http://www.globalretailtech.com/  they have an
open-source JavaPOS POS program that uses the JCL.  basically the idea of
the JCL is to allow your POS application to open up a device, say
"MyLineDisplay".  your application will then use standard UnifiedPOS calls
to the line display that you opened. a simple example would be:

LineDisplay ld = new LineDisplay();
ld.open("MyLineDisplay");
ld.claim(1000);
ld.clearText();
ld.displayText("This is a test",0);
ld.release();
ld.close();

this simple example will open up a Linedisplay object and display the text
"this is a test".  where the JCL and "MyLineDisplay" comes into play is in
your jpos.xml file. and Example jpos.xml file for a Ultimate Technology
Linedisplay would look like this.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE JposEntries PUBLIC "=//JavaPOS//DTD//EN"
                             "jpos/res/jcl.dtd">
<JposEntries>
	<JposEntry logicalName="MyLineDisplay">
		<creation
factoryClass="com.ultimatetechnology.jpos.UTCJposServiceInstanceFactory"
serviceClass="com.ultimatetechnology.jpos.linedisplay.LineDisplayService"/>
		<vendor name="Ultimate Technology"
url="http://www.ultimatetechnology.com"/>
		<jpos category="LineDisplay" version="1.7"/>
		<product description="JavaPOS driver for serial line
display" name="PD1100" url="http://ultimatetechnology.com"/>
		<prop name="deviceBus" type="String" value="RS232"/>
		<prop name="baudRate" type="String" value="9600"/>
		<prop name="parity" type="String" value="none"/>
		<prop name="flowControl" type="String" value="none"/>
		<prop name="portName" type="String" value="COM1"/>
		<prop name="stopBits" type="String" value="1"/>
		<prop name="dataBits" type="String" value="8"/>
	</JposEntry>
</JposEntries>


As you can see the jpos.xml and JCL abstract the device so that your program
can just open up a LineDisplay and it won't care about any of the device
settings.

I hope this helped you.

--Jeffrey Lange
la...@ul...
Software Engineer
Ultimate Technology Corp.
(585) 742-5244


-----Original Message-----
From: Siu, Chun Kin [mailto:Chu...@ge...]
Sent: Wednesday, February 05, 2003 3:11 AM
To: 'jpo...@ww...'
Subject: [Jposloader-discuss] Where to start developing a JavaPOS
system?


Hi guys,

	I am novice to retail POS system, my supervisor ask me to
investigate the difficulties in changing existing POS application to JavaPOS
competitable. For me a developer, what should I start with? I have already
download the UnifiedPOS Spec. version 1.7, but it seem not something I am
seeking for, I am now very confuse about jcl, jpos. Is there any example
that I can get a basic concept?  

	Thx.

Kin
_______________________________________________
Jposloader-discuss mailing list
Jpo...@ww...
http://www-124.ibm.com/developerworks/oss/mailman/listinfo/jposloader-discus
s