Barcode failed to display in PDF with XFDF

Hi,
I am a newbie in this forum and if you found my topic should not be posted here,
please kindly let me know.
I have a question about online filling data to a PDF and hope someone can help me.
I am having a XFDF and PDF and data will be filled into PDF online. One of the fields
on the PDF is a code 3 of 9 (code39) barcode. The PDF has embedded the code39
font in it but the PDF does not format the text values into barcode form.
I found an article in web showing how to show barcode on PDF with XFDF
<field name="Barcode" type="barcode" symbology="pdf417" >
        <value>
            PDF-417 is a "stacked linear" symbology invented by
            Symbol.  The iText library makes it very easy to embed this
            symbology in a PDF file.
        </value>
</field>
Must I specify this format in the XFDF file such that the PDF knows the text field is
a barcode format?
Should I change the 'symbology="pdf417"'  into 'symbology="code39"' ?
If you have any experience on this issue, please kindly share it with me.
Thanks a lot,
Raymond

That sounds like an old nVidia display driver bug.
Is there any possibility you took a Windows Update or something that ''updated'' your display driver to an older WHQL version?
Perhaps completely removing the driver and getting the very latest one from nVidia.com might be in order.
-Noel

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