Click here to Skip to main content
Click here to Skip to main content

Tagged as

Barcode scanning

, 5 Jan 2011 CPOL
Rate this:
Please Sign up or sign in to vote.
A fragment showing how easy it is to read borcodes from serially attached Symbol barcode scanners
The following contains some code required to read barcodes from a Symbol barcode scanner.
 
The StringReceivedEvent serves up scanned barcodes.
 
The purpose of this tip is to show that getting barcodes from barcode scanners is quite simple.
 
Luc Pattyn[^] made a few hints, so I've reduced the code part of the tip to make it more readable. I'll obviously have to rewrite this as an article at a later time Blush | :O
 
    public class SerialPortIO : Component
    {
        private static void LogException(Exception exc, System.Reflection.MethodBase method)
        {
        // Log exceptions here 
        } 
        SerialPort serialPort;
        public EventHandlerzSerialPortIOStringEventArgs> StringReceivedEvent;
 
Code removed, just standard component constructors, initialization and error handling stuff.
 
So raise the event:
protected virtual void OnReceiveString(string characters)
        {
            if (StringReceivedEvent != null)
            {
                SerialPortIOStringEventArgs eventArgs = new SerialPortIOStringEventArgs(characters);
                StringReceivedEvent(this, eventArgs);
            }
        }
Event handler registered with the internal SerialPort Component:
private void ProcessSerialPortDataReceivedEvent(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                ProcessSerialPortData(sender, e);
            }
            catch (Exception exc)
            {
                LogException(exc, System.Reflection.MethodBase.GetCurrentMethod());
            }
        }
Method that can be overridden in derived components to modify how to retrieve the data from the SerialPort component.
protected virtual void ProcessSerialPortData(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                string characters = ReadLine();
                if (characters != null)
                {
                    characters = characters.Trim();
                    OnReceiveString(characters);
                }
            }
            catch (Exception exc)
            {
                LogException(exc, System.Reflection.MethodBase.GetCurrentMethod());
                throw;
            }
        }
 
In the hope that it might prove useful,
Espen Harlinn

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Espen Harlinn
Architect Powel AS
Norway Norway
Chief Architect - Powel AS.
 
Specializing in integrated operations and high performance computing solutions.
 
I’ve been fooling around with computers since the early eighties, I’ve even done work on CP/M and MP/M.
 
Wrote my first “real” program on a BBC micro model B based on a series in a magazine at that time. It was fun and I got hooked on this thing called programming ...
 
A few Highlights:
  • High performance application server development
  • Model Driven Architecture and Code generators
  • Real-Time Distributed Solutions
  • C, C++, C#, Java, TSQL, PL/SQL, Delphi, ActionScript, Perl, Rexx
  • Microsoft SQL Server, Oracle RDBMS, IBM DB2, PostGreSQL
  • AMQP, Apache qpid, RabbitMQ, Microsoft Message Queuing, IBM WebSphereMQ, Oracle TuxidoMQ
  • Oracle WebLogic, IBM WebSphere
  • Corba, COM, DCE, WCF
  • AspenTech InfoPlus.21(IP21), OsiSoft PI
 
More information about what I do for a living can be found at: harlinn.com or LinkedIn
 
You can contact me at espen.harlinn@powel.no

Comments and Discussions

 
Questionbarcode scanning result PinmemberAdeleB24-Aug-14 17:50 
Questionhow to output the scanning data Pinmemberhongdida31-Jul-13 17:10 
AnswerRe: how to output the scanning data PinmvpEspen Harlinn31-Jul-13 17:20 
GeneralVery helpful post, thanks PinmemberThomasssss4-Mar-13 18:24 
GeneralMessage Removed PinmemberMember 984580013-Jun-13 17:35 
GeneralRe: Very helpful post, thanks PinmvpEspen Harlinn14-Jun-13 6:07 
GeneralReason for my vote of 5 Good one man Pinmvpthatraja22-Feb-11 16:26 
GeneralRe: Thank you thatraja! PinmvpEspen Harlinn23-Feb-11 10:55 
GeneralThanks PinmvpEspen Harlinn10-Jan-11 9:58 
GeneralReason for my vote of 5 nice presentation Pinmemberkiranbhakre110-Jan-11 8:20 
GeneralOK, Luc, I've modified it PinmvpEspen Harlinn2-Jan-11 11:26 
GeneralIf you were to show only a fraction of the code, explaining ... PinmvpLuc Pattyn2-Jan-11 7:58 
GeneralReason for my vote of 1 Too much code. PinmvpLuc Pattyn2-Jan-11 7:56 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web04 | 2.8.1411019.1 | Last Updated 5 Jan 2011
Article Copyright 2011 by Espen Harlinn
Everything else Copyright © CodeProject, 1999-2014
Layout: fixed | fluid