(Ruby) PC/SC List Smart Card Readers (and USB Tokens)

See more SCard Examples

Demonstrates how to list the smart card readers and USB tokens connected to the computer.

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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
    print i.to_s() + ": " + stReaders.stringAt(i) + "\n";
    i = i + 1
end

# Sample output:
# 0: Alcor Micro USB Smart Card Reader 0
# 1: FS USB Token 0
# 2: FT Java Token 0
# 3: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0
# 4: Yubico YubiKey OTP+FIDO+CCID 0

# Applications should always release the context when finished.
success = scard.ReleaseContext()
if (success == false)
    print scard.lastErrorText() + "\n";
end