Tcl

PC/SC Check the Status of each Smart Card Reader (and USB token)

See more SCard Examples

Demonstrates how to list the smart card readers and USB tokens connected to the computer, and check the status of each.

Note: This functionality was introduced in Chilkat v9.5.0.87.

Tcl

load ./chilkat.dll

set success 0

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set scard [new_CkSCard]

# First establish a context to the PC/SC Resource Manager
set success [CkSCard_EstablishContext $scard "user"]
if {$success == 0} then {
    puts [CkSCard_lastErrorText $scard]
    delete_CkSCard $scard
    exit
}

set stReaders [new_CkStringTable]

set success [CkSCard_ListReaders $scard $stReaders]
if {$success == 0} then {
    puts [CkSCard_lastErrorText $scard]
    delete_CkSCard $scard
    delete_CkStringTable $stReaders
    exit
}

set numReaders [CkStringTable_get_Count $stReaders]
set i 0
while {$i < $numReaders} {
    set reader [CkStringTable_stringAt $stReaders $i]

    puts "$i: $reader"

    # Connect to this reader.
    if {[CkSCard_Connect $scard $reader "shared" "no_preference"] == 1} then {

        # Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
        if {[CkSCard_CheckStatus $scard] == 1} then {
            puts "ReaderStatus: [CkSCard_readerStatus $scard]"
            puts "CardAtr: [CkSCard_cardAtr $scard]"
            puts "ActiveProtocol: [CkSCard_activeProtocol $scard]"
        }         else {
            puts [CkSCard_lastErrorText $scard]
            puts "CheckStatus failed."
        }

        # Disconnect from this reader.
        set success [CkSCard_Disconnect $scard "leave"]
    }     else {
        puts [CkSCard_lastErrorText $scard]
        puts "Connect failed."
    }

    puts "---------------------------------------"
    set i [expr $i + 1]
}

# Sample output:

# 0: Alcor Micro USB Smart Card Reader 0
# ReaderStatus: specific
# CardAtr: 3B7F96000080318065B0855956FB120FFE829000
# ActiveProtocol: T0
# ---------------------------------------
# 1: Generic Smart Card Reader Interface 0
# ReaderStatus: specific
# CardAtr: 3BFC180000813180459067464A00641606F2727E00E0
# ActiveProtocol: T1
# ---------------------------------------
# 2: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0
# ReaderStatus: specific
# CardAtr: 3BDF96FF8131FE455A018048494443313158587300011B09
# ActiveProtocol: T1
# ---------------------------------------

# Applications should always release the context when finished.
set success [CkSCard_ReleaseContext $scard]
if {$success == 0} then {
    puts [CkSCard_lastErrorText $scard]
}


delete_CkSCard $scard
delete_CkStringTable $stReaders