[Pyscard-devel] [ pyscard-Bugs-3427826 ] SCardControl issue with python 2.7

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Bugs item #3427826, was opened at 2011-10-24 13:39
Message generated for change (Comment added) made by pbourgault
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Category: PCSC wrapper
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Philippe BOURGAULT (pbourgault)
Assigned to: jean-daniel aussel (jdaussel)
Summary: SCardControl issue with python 2.7

Initial Comment:
Hello,

I am using pyscard 2.6.12 and python 2.7.2 and I have a issue with ScardControl.
When calling SCardControl to send proprietary command to reader, the ScardControl returns 0x0000001F error code.
Only SCardControl calls sending data to reader, are having this behavior.
SCardControl, used for getting attributes for example, still runs fine.

Please find attached a sample code.
This code works fine using python 2.5 and 2.6 but fails on python 2.7.
Unfortunately, as these commands are proprietary to our CL1356A+ reader , you will not been able to run this code. If you cannot adapt this code on another reader, I can eventually lend you a CL1356A+ reader for debugging purposes.

Thanks, regards,
Philippe BOURGAULT


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>Comment By: Philippe BOURGAULT (pbourgault)
Date: 2011-10-25 05:01

Message:
Hi again,

Just a small addon to my last answer.

I have logged the USB exchange with a USB traffic analyser and it shows
that the request is correctly sent to the reader and that the response is
also correctly sent to the host. The problem is therefore likely to be in
the processing of the response.
I have compared a successfull exchange done using Python 2.6 and an
exchange with problem done with Python 2.7 and they are exactly bit to bit
the same.

I cannot perform Linux test at this time but I think it is reasonable to
assume that the issue is specific to Python 2.7 and the Windows
implementation of the wrapper. May be some regression was introduced in
Python 2.7 C/API.

Regards,

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Comment By: Philippe BOURGAULT (pbourgault)
Date: 2011-10-25 04:52

Message:
Hi Ludovic,

I am using Windows and I have the problem with all SCardControl that are
exchanging data with the reader; not the other one like getting or setting
attributes.
However, the issue (with exactly same code) doesn't happen on Windows
using same pyscard version (1.6.12) on python 2.5 and 2.6; only 2.7 has the
problem. Moreover, there is no issue when calling SCardControl from C
language with the same data.

I'm not a specialist about wrappers but It is likely that there is
something inconsistent between the wrapper and python 2.7.

Regards,

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Comment By: Ludovic Rousseau (ludov)
Date: 2011-10-24 18:49

Message:
Hello Philippe,

I guess you are using Windows. Exact?
Do you have the problem with all the SCardControl() or just some of them?
Do you have the same problem under GNU/Linux or Mac OS X?

I am using Python 2.7.1 on Mac OS X Lion and do not have a problem with
SCardControl(). So maybe the problem is Windows specific.

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