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Barcode Scanning

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5 Jan 2011CPOL 70.7K   33   15
A fragment showing how easy it is to read barcodes 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 :-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)
                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)
                string characters = ReadLine();
                if (characters != null)
                    characters = characters.Trim();
            catch (Exception exc)
                LogException(exc, System.Reflection.MethodBase.GetCurrentMethod());

I hope that it might prove useful.


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

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Architect Sea Surveillance AS
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Comments and Discussions

QuestionHow to read Barcode images in application Pin
MChandraKanth25-Nov-15 2:35
MChandraKanth25-Nov-15 2:35 
AnswerRe: How to read Barcode images in application Pin
Espen Harlinn25-Nov-15 11:13
professionalEspen Harlinn25-Nov-15 11:13 
Questionbarcode scanning result Pin
AdeleB24-Aug-14 17:50
AdeleB24-Aug-14 17:50 
QuestionMessage Closed Pin
31-Jul-13 17:10
hongdida31-Jul-13 17:10 
AnswerRe: how to output the scanning data Pin
Espen Harlinn31-Jul-13 17:20
professionalEspen Harlinn31-Jul-13 17:20 
GeneralMessage Closed Pin
4-Mar-13 18:24
Thomasssss4-Mar-13 18:24 
GeneralMessage Closed Pin
13-Jun-13 17:35
Member 984580013-Jun-13 17:35 
GeneralRe: Very helpful post, thanks Pin
Espen Harlinn14-Jun-13 6:07
professionalEspen Harlinn14-Jun-13 6:07 
GeneralReason for my vote of 5 Good one man Pin
thatraja22-Feb-11 16:26
professionalthatraja22-Feb-11 16:26 
GeneralRe: Thank you thatraja! Pin
Espen Harlinn23-Feb-11 10:55
professionalEspen Harlinn23-Feb-11 10:55 
GeneralThanks Pin
Espen Harlinn10-Jan-11 9:58
professionalEspen Harlinn10-Jan-11 9:58 
GeneralReason for my vote of 5 nice presentation Pin
kiranbhakre110-Jan-11 8:20
kiranbhakre110-Jan-11 8:20 
GeneralOK, Luc, I've modified it Pin
Espen Harlinn2-Jan-11 11:26
professionalEspen Harlinn2-Jan-11 11:26 
GeneralIf you were to show only a fraction of the code, explaining ... Pin
Luc Pattyn2-Jan-11 7:58
sitebuilderLuc Pattyn2-Jan-11 7:58 
GeneralReason for my vote of 1 Too much code. Pin
Luc Pattyn2-Jan-11 7:56
sitebuilderLuc Pattyn2-Jan-11 7:56 

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