(Objective-C) Load Default Certificate from Smart Card or Token

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Chilkat contains internal logic to examine a connected smart card or USB token, and will make decisions based on make/model to successfully interact with the hardware. When faced with a new smartcard or token, the best starting point is to call LoadFromSmartcard with an empty string argument to see what Chilkat discovers.

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#import <CkoCert.h>

CkoCert *cert = [[CkoCert alloc] init];

// If you know the smart card PIN, it's good to set it prior to loading from the smartcard/USB token.
cert.SmartCardPin = @"12345678";

// To let Chilkat discover what smartcard or token is connected, pass an empty string to LoadFromSmartcard.
// When testing in this way, it's best to have only a single smartcard or token connected to the system.
BOOL success = [cert LoadFromSmartcard: @""];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    NSLog(@"%@",@"Certificate not loaded.");
    return;
}

// The LastErrorText property on all Chilkat objects will contain 
// information even when the method call is successful.
// You can examine the LastErrorText to see what Chilkat found and
// what decisions were made.
// 
// For example, if a certificate was successfully loaded via LoadFromSmartcard,
// but then signing failed, such as w/ Pdf, XmlDSig, CAdES, etc.,
// then we would want to examine the LastErrorText from the call to
// LoadFromSmartcard to get detailed information about the card.
NSLog(@"%@",cert.LastErrorText);

NSLog(@"%@%@%@%@",@"Found: ",cert.SubjectDN,@" serial=",cert.SerialNumber);