Xojo Plugin

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.

Xojo Plugin

Dim success As Boolean
success = False

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

Dim scard As New Chilkat.SCard

// First establish a context to the PC/SC Resource Manager
success = scard.EstablishContext("user")
If (success = False) Then
    System.DebugLog(scard.LastErrorText)
    Return
End If

Dim stReaders As New Chilkat.StringTable
success = scard.ListReaders(stReaders)
If (success = False) Then
    System.DebugLog(scard.LastErrorText)
    Return
End If

Dim numReaders As Int32
numReaders = stReaders.Count
Dim i As Int32
i = 0
While i < numReaders
    Dim reader As String
    reader = stReaders.StringAt(i)

    System.DebugLog(Str(i) + ": " + reader)

    // Connect to this reader.
    If (scard.Connect(reader,"shared","no_preference") = True) Then

        // Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
        If (scard.CheckStatus() = True) Then
            System.DebugLog("ReaderStatus: " + scard.ReaderStatus)
            System.DebugLog("CardAtr: " + scard.CardAtr)
            System.DebugLog("ActiveProtocol: " + scard.ActiveProtocol)
        Else
            System.DebugLog(scard.LastErrorText)
            System.DebugLog("CheckStatus failed.")
        End If

        // Disconnect from this reader.
        success = scard.Disconnect("leave")
    Else
        System.DebugLog(scard.LastErrorText)
        System.DebugLog("Connect failed.")
    End If

    System.DebugLog("---------------------------------------")
    i = i + 1
Wend

// 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) Then
    System.DebugLog(scard.LastErrorText)
End If