Delphi ActiveX

PC/SC Find Inserted Smart Cards

See more SCard Examples

Get detailed information about each reader including whether or not a smart card is currently inserted in the reader. (Also includes USB tokens.)

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

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
scard: TChilkatSCard;
json: TChilkatJsonObject;
name: WideString;
state: WideString;
vendorName: WideString;
systemName: WideString;
cardAtr: WideString;
cardWindowsMiniDriver: WideString;
cardWindowsCryptoProvider: WideString;
cardWindowsKeyStorageProvider: WideString;
serialNumber: WideString;
i: Integer;
count_i: Integer;

begin
success := 0;

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

scard := TChilkatSCard.Create(Self);

// First establish a context to the PC/SC Resource Manager
success := scard.EstablishContext('user');
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
    Exit;
  end;

// Get JSON containing information about the smartcards currently inserted into readers.
// This also includes information about USB security tokens.
json := TChilkatJsonObject.Create(Self);
success := scard.FindSmartcards(json.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
    Exit;
  end;

json.EmitCompact := 0;
Memo1.Lines.Add(json.Emit());

// Here is sample output:
// See below for sample code to parse the JSON.

// You can see which readers have a card inserted by the "state".
// If the state contains "present", then a card is inserted into the reader.
// (USB tokens will typically always have a state containing "present")
// Also, the ATR of the card inserted into the reader is indicated by "atr".

// {
//   "reader": [
//     {
//       "name": "Alcor Micro USB Smart Card Reader 0",
//       "state": "present,inuse",
//       "vendorName": "Alcor Micro",
//       "systemName": "Alcor Micro USB Smart Card Reader 0",
//       "card": {
//         "atr": "3B7F96000080318065B0855956FB120FFE829000",
//         "windows": {
//           "miniDriver": "AxaltoCM.dll",
//           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
//           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
//         }
//       }
//     },
//     {
//       "name": "FS USB Token 0",
//       "state": "present,inuse",
//       "vendorName": "FS",
//       "serialNumber": "3F",
//       "systemName": "FS USB Token 0",
//       "card": {
//         "atr": "3B9F958131FE9F006646530534002571DF000000000012",
//         "windows": {
//           "miniDriver": "eps2003csp11",
//           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
//           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
//         }
//       }
//     },
//     {
//       "name": "FT Java Token 0",
//       "state": "present",
//       "vendorName": "FT",
//       "serialNumber": "3F",
//       "systemName": "FT Java Token 0",
//       "card": {
//         "atr": "3BFC180000813180459067464A00642D70C172FEE0FE",
//         "windows": {
//           "miniDriver": "tagliov70px.dll",
//           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
//           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
//         }
//       }
//     },
//     {
//       "name": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0",
//       "state": "present",
//       "vendorName": "SCM Microsystems Inc.",
//       "serialNumber": "333130303330",
//       "systemName": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0",
//       "card": {
//         "atr": "3BFC180000813180459067464A00641606F2727E00E0",
//         "windows": {
//           "miniDriver": "tagliov70px.dll",
//           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
//           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
//         }
//       }
//     },
//     {
//       "name": "Yubico YubiKey OTP+FIDO+CCID 0",
//       "state": "present",
//       "vendorName": "Yubico",
//       "serialNumber": "3F",
//       "systemName": "Yubico YubiKey OTP+FIDO+CCID 0",
//       "card": {
//         "atr": "3BFD1300008131FE158073C021C057597562694B657940",
//         "windows": {
//           "miniDriver": "msclmd.dll",
//           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
//           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
//         }
//       }
//     }
//   ]
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

i := 0;
count_i := json.SizeOfArray('reader');
while i < count_i do
  begin
    json.I := i;
    name := json.StringOf('reader[i].name');
    state := json.StringOf('reader[i].state');
    vendorName := json.StringOf('reader[i].vendorName');
    systemName := json.StringOf('reader[i].systemName');
    cardAtr := json.StringOf('reader[i].card.atr');
    cardWindowsMiniDriver := json.StringOf('reader[i].card.windows.miniDriver');
    cardWindowsCryptoProvider := json.StringOf('reader[i].card.windows.cryptoProvider');
    cardWindowsKeyStorageProvider := json.StringOf('reader[i].card.windows.keyStorageProvider');
    serialNumber := json.StringOf('reader[i].serialNumber');
    i := i + 1;
  end;

// Applications should always release the context when finished.
success := scard.ReleaseContext();
if (success = 0) then
  begin
    Memo1.Lines.Add(scard.LastErrorText);
  end;
end;