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Posted 3 Jan 2011

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Barcode Scanning

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4.89/5 (8 votes)
5 Jan 2011CPOL
A fragment showing how easy it is to read barcodes from serially attached Symbol barcode scanners

Introduction

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 :-O

C#
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:

C#
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:

C#
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.

C#
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;
            }
        }

I hope that it might prove useful.

License

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

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About the Author

Espen Harlinn
Architect Sea Surveillance AS
Norway Norway
Chief Architect - Sea Surveillance 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.no

Comments and Discussions

 
QuestionHow to read Barcode images in asp.net application Pin
MChandraKanth25-Nov-15 1:35
MemberMChandraKanth25-Nov-15 1:35 
AnswerRe: How to read Barcode images in asp.net application Pin
Espen Harlinn25-Nov-15 10:13
professionalEspen Harlinn25-Nov-15 10:13 
Questionbarcode scanning result Pin
AdeleB24-Aug-14 16:50
MemberAdeleB24-Aug-14 16:50 
QuestionMessage Closed Pin
31-Jul-13 16:10
Memberhongdida31-Jul-13 16:10 
AnswerRe: how to output the scanning data Pin
Espen Harlinn31-Jul-13 16:20
professionalEspen Harlinn31-Jul-13 16:20 
GeneralMessage Closed Pin
4-Mar-13 17:24
MemberThomasssss4-Mar-13 17:24 
GeneralMessage Closed Pin
13-Jun-13 16:35
MemberMember 984580013-Jun-13 16:35 
GeneralRe: Very helpful post, thanks Pin
Espen Harlinn14-Jun-13 5:07
professionalEspen Harlinn14-Jun-13 5:07 
GeneralReason for my vote of 5 Good one man Pin
thatraja22-Feb-11 15:26
professionalthatraja22-Feb-11 15:26 
GeneralRe: Thank you thatraja! Pin
Espen Harlinn23-Feb-11 9:55
professionalEspen Harlinn23-Feb-11 9:55 
GeneralThanks Pin
Espen Harlinn10-Jan-11 8:58
professionalEspen Harlinn10-Jan-11 8:58 
GeneralReason for my vote of 5 nice presentation Pin
kiranbhakre110-Jan-11 7:20
Memberkiranbhakre110-Jan-11 7:20 
GeneralOK, Luc, I've modified it Pin
Espen Harlinn2-Jan-11 10:26
professionalEspen Harlinn2-Jan-11 10:26 
GeneralIf you were to show only a fraction of the code, explaining ... Pin
Luc Pattyn2-Jan-11 6:58
sitebuilderLuc Pattyn2-Jan-11 6:58 
GeneralReason for my vote of 1 Too much code. Pin
Luc Pattyn2-Jan-11 6:56
sitebuilderLuc Pattyn2-Jan-11 6:56 

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