nfcpy

Tag object reading

Asked by Matthew Crown on 2015-09-16

Hello all,

I have used the sample code within getting started to try and creating a program which can retrieve the unique id of a type 2 tag to be stored within a database along with a username. However, when I attempt to remove the the "Type 2 Tag=" part of the returned data from the tag function, I am unable to iterate over this as the object is not iterable. I can however force this data to be a string and then parse the result. My question is this: is there a way to retrieve only the id attribute itself, or is it a better idea to force the result to be a string and then use this within my solution?

Thanks,

Matt

Question information

Language:: English Edit question

Status:: Solved

For:: nfcpy Edit question

Assignee:: No assignee Edit question

Solved by:: Stephen Tiedemann

Solved:: 2015-09-19

Last query:: 2015-09-19

Last reply:: 2015-09-18

Link existing bug

Stephen Tiedemann (stephen-tiedemann) said on 2015-09-17:

I'm not sure how you attempted to get the ID but here's a code snippet that print's the tag identifier, and then the tag object representation and the formatted string.

>>> import nfc
>>> clf = nfc.ContactlessFrontend("usb")
>>> tag = clf.connect(rdwr={'on-connect': lambda tag: False})
>>> tag.identifier
'\x04\x94\xff\xc2\xd78\x80'
>>> repr(tag)
'<nfc.tag.tt2_nxp.NTAG216 object at 0x7fec4ac09e50>'
>>> str(tag)
"Type2Tag 'NXP NTAG216' ID=0494FFC2D73880"

Matthew Crown (matthewcrown) said on 2015-09-18:

Thanks for the reply. Still just need a little more clarification:

When I use

>>> print(repr(tag))
>>>print(str(tag))

this works fine but when I run

>>> print(tag.identifier)

this doesn't appear to give an output - it does give me some sort of issue with regards the character coding though which I'm unsure about. Can you tell me will tag.identifier work for all cards or only some?