Objective-C

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.

Objective-C

#import <CkoSCard.h>
#import <CkoStringTable.h>
#import <NSString.h>

BOOL success = NO;

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

CkoSCard *scard = [[CkoSCard alloc] init];

// First establish a context to the PC/SC Resource Manager
success = [scard EstablishContext: @"user"];
if (success == NO) {
    NSLog(@"%@",scard.LastErrorText);
    return;
}

CkoStringTable *stReaders = [[CkoStringTable alloc] init];
success = [scard ListReaders: stReaders];
if (success == NO) {
    NSLog(@"%@",scard.LastErrorText);
    return;
}

int numReaders = [stReaders.Count intValue];
int i = 0;
while (i < numReaders) {
    NSString *reader = [stReaders StringAt: [NSNumber numberWithInt: i]];

    NSLog(@"%d%@%@",i,@": ",reader);

    // Connect to this reader.
    if ([scard Connect: reader shareMode: @"shared" preferredProtocol: @"no_preference"] == YES) {

        // Check the status to get the reader state, active protocol, and card ATR (if a card is inserted).
        if ([scard CheckStatus] == YES) {
            NSLog(@"%@%@",@"ReaderStatus: ",scard.ReaderStatus);
            NSLog(@"%@%@",@"CardAtr: ",scard.CardAtr);
            NSLog(@"%@%@",@"ActiveProtocol: ",scard.ActiveProtocol);
        }
        else {
            NSLog(@"%@",scard.LastErrorText);
            NSLog(@"%@",@"CheckStatus failed.");
        }

        // Disconnect from this reader.
        success = [scard Disconnect: @"leave"];
    }
    else {
        NSLog(@"%@",scard.LastErrorText);
        NSLog(@"%@",@"Connect failed.");
    }

    NSLog(@"%@",@"---------------------------------------");
    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 == NO) {
    NSLog(@"%@",scard.LastErrorText);
}