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Posted by iulian.ilea on 10/22/06 11:36
larry@portcommodore.com wrote:
> madunix wrote:
> > I am in the process to create an online form using PHP with DB Oracle
> > or MySQL, this form which consist of
> > 2x parts personal data and finance data, and it will be filled by the
> > users, once the form is filled and submitted ,
> > it will be saved to the system as reference and printed as hardcopy it
> > could be a pdf or not, but the print format
> > will be on A4 format hardcopy with printed random generated (internal
> > calculation) bar code printed on the paper.
> > Then in the central office through bar code readers the date will be
> > retrieved.
> >
> > Any one implemented this kind of application, if yes how did you
> > generate the bar code on the web form
> > through php, and which bar code readers did you use in order to access
> > and retrieve the data from the form?
> >
> > Thnaks
>
> If you are doing barcodes you need either to have a common (as in
> identifyable by HTML FONT tags) barcode font installed on the clinet
> computer or b) use something that generates the barcode graphic on the
> server side (either as an attached GIF/PNG or as a PDF documant).
>
> Next problem is when you print the barcode it may be scanable or not
> depending on the clinet's printer and drivers (i.e. I have seen wide
> variations), even if the print is crisp, sometimes the driver fudges on
> the images to fit to page and may change the width of some of the
> barcode bars (making it unreadable) so making the codes a larger (or
> sometimes slightly smaller) size may help.
>
> As for readters I use keyboard wedge readers (scan the code, it enters
> it into the computer as if you typed the alhanumeric value it
> represents.) In the US you can get a inexpensive scanner through CDW
> i.e. http://www.cdw.com/shop/products/default.aspx?EDC=654453 , this
> one is a CCD scanner, which means you have to put the scanner next to
> the code to read, others are wand or pen scanners, which you drag
> across the code (cheap not great reliability) or laser scanners which
> you point and click gun style (best but quite expensive) CCD is in the
> mid-range.
>
> Probably the easiest barcode symbology is code 3 of 9 which is an
> alpha-neumeric code that can be in a font form (thare are many other
> symbologies that are more compact or have comapatibility -UPC- and
> usually are more complex to generate). Here is a site that has code
> 3of9 free in true type form:
> http://www.barcodetraders.com/bct_scan_barcode.asp
>
> Using the code in an application you need to think about how you want
> it to work, most stores you see the registers just scan one item after
> another, which means there is just one text entry field on the screen
> (the code) they scan the code with is either a product code (like an im
> ID number) or some control code (i.e. coupon - 10% off - maybe says
> something like C2006011210, the C tells the computer the entry is a
> coupon) anyway a bit of imagination and planning and you can make up
> some really cool applications with barcodes.
>
> Hope that helps
> Larry
See this: http://www.fpdf.org/en/script/script5.php if you want to
generate EAN13. The same algorithm I used in an ASP page and it worked.
I printed the code on a laser printer and I it was readable from
different scanners.
I read above that maybe it will not be readable if the printed page is
resized to fit the page. I THINK (I'm not sure) that will work because
if an image with width of 250 is resized to 290 also the white and
black stripes are resized equally. ...And THEORETICALLY it can be read.
If you want to generate CODE 39, POSTNET, i25 barcodes:
http://www.fpdf.org/en/script/index.php. Use the algorithm, you don't
have to create pdf.
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