[nycphp-talk] Barcodes

Rolan Yang rolan at
Thu Aug 6 18:53:30 EDT 2009

Many barcode reading devices act as a keyboard emulator via USB or PS2 

I have written keyboardless touchscreen and barcode scanner kiosk apps 
based on apache/php.
One simple trick is to create a form on the page and have a body onload 
javascript running that does a constant "focus" to the form field. That 
way input from the scanner is always entered into the form.  If you 
don't want the field to be visible, use some css to make it the same 
color as the background or very tiny in size. The scanner device should 
read the barcode, dump it to the form field and send an "enter" key when 


Ajai Khattri wrote:
> Im looking for an algorithm or description of how someone would go about 
> reading the barcode from an image. Are there any libraries out there that 
> I can use?

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