Ruby

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.

Ruby

require 'chilkat'

success = false

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

scard = Chilkat::CkSCard.new()

# First establish a context to the PC/SC Resource Manager
success = scard.EstablishContext("user")
if (success == false)
    print scard.lastErrorText() + "\n";
    exit
end

stReaders = Chilkat::CkStringTable.new()
success = scard.ListReaders(stReaders)
if (success == false)
    print scard.lastErrorText() + "\n";
    exit
end

numReaders = stReaders.get_Count()
i = 0
while i < numReaders
    reader = stReaders.stringAt(i)

    print i.to_s() + ": " + reader + "\n";

    # Connect to this reader.
    if (scard.Connect(reader,"shared","no_preference") == true)

        # Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
        if (scard.CheckStatus() == true)
            print "ReaderStatus: " + scard.readerStatus() + "\n";
            print "CardAtr: " + scard.cardAtr() + "\n";
            print "ActiveProtocol: " + scard.activeProtocol() + "\n";
        else
            print scard.lastErrorText() + "\n";
            print "CheckStatus failed." + "\n";
        end

        # Disconnect from this reader.
        success = scard.Disconnect("leave")
    else
        print scard.lastErrorText() + "\n";
        print "Connect failed." + "\n";
    end

    print "---------------------------------------" + "\n";
    i = i + 1
end

# 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.
success = scard.ReleaseContext()
if (success == false)
    print scard.lastErrorText() + "\n";
end