David,
> DC: I'm forwarding this bounced message but I want to comment on Carlos's
> DC: email. That approach would be fine, lets see what the others think.
> DC: I suppose you could also use SCardControl and we could design a PPS
> DC: structure .... Does anyone know how it is done on Win32 ?
I asked this question in the Microsoft SmartCard DDK Mailinglist
some time ago. They told me it's up to the driver to check the
ATR setting and apply a PPS/PTS. Furthermore, the SMCLIB can
assist by translating the ATR and tell the driver what to do.
All you can do manually in you application is setting a parameter
during tha call to SetProtocol:
from WINSMCRD.H
#define SCARD_PROTOCOL_UNDEFINED 0x00000000
// There is no active protocol.
#define SCARD_PROTOCOL_T0 0x00000001
// T=0 is the active protocol.
#define SCARD_PROTOCOL_T1 0x00000002
// T=1 is the active protocol.
#define SCARD_PROTOCOL_RAW 0x00010000
// Raw is the active protocol.
#define SCARD_PROTOCOL_DEFAULT 0x80000000
// Use implicit PTS.
// Since using the optimal parameters is the default case
// no bit is defined to be 1
#define SCARD_PROTOCOL_OPTIMAL 0x00000000
// Use PTS to optimize protocol.
This leaves some questions:
* What really is the optimal setting for any card?
* What if the card's ATR does not tell the optimal setting?
* What if the optimal setting for my application/environment
is not the setting given in the ATR?
Unfortunately, there is no way to issue a PPS/PTS via PC/SC
manually in Windows. And so we have many vendor-specific
implementation, which offer a proprietary way.
Axel
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