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

See more SCard Examples

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

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

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

var scard = new CkSCard();

// First establish a context to the PC/SC Resource Manager
success = scard.EstablishContext("user");
if (success == false) {
    console.log(scard.LastErrorText);
    return;
}

var stReaders = new CkStringTable();
success = scard.ListReaders(stReaders);
if (success == false) {
    console.log(scard.LastErrorText);
    return;
}

var numReaders = stReaders.Count;
var i = 0;
while (i < numReaders) {
    var reader = stReaders.StringAt(i);

    console.log(i + ": " + reader);

    // 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) {
            console.log("ReaderStatus: " + scard.ReaderStatus);
            console.log("CardAtr: " + scard.CardAtr);
            console.log("ActiveProtocol: " + scard.ActiveProtocol);
        }
        else {
            console.log(scard.LastErrorText);
            console.log("CheckStatus failed.");
        }

        // Disconnect from this reader.
        success = scard.Disconnect("leave");
    }
    else {
        console.log(scard.LastErrorText);
        console.log("Connect failed.");
    }

    console.log("---------------------------------------");
    i = 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.
success = scard.ReleaseContext();
if (success == false) {
    console.log(scard.LastErrorText);
}