Pascal (Lazarus/Delphi)

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.

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.JsonObject,
  Chilkat.SCard;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  scard: TSCard;
  json: TJsonObject;
  name: string;
  state: string;
  vendorName: string;
  systemName: string;
  cardAtr: string;
  cardWindowsMiniDriver: string;
  cardWindowsCryptoProvider: string;
  cardWindowsKeyStorageProvider: string;
  serialNumber: string;
  i: Integer;
  count_i: Integer;

begin
  success := False;

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

  scard := TSCard.Create;

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

  //  Get JSON containing information about the smartcards currently inserted into readers.
  //  This also includes information about USB security tokens.
  json := TJsonObject.Create;
  success := scard.FindSmartcards(json);
  if (success = False) then
    begin
      WriteLn(scard.LastErrorText);
      Exit;
    end;

  json.EmitCompact := False;
  WriteLn(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 = False) then
    begin
      WriteLn(scard.LastErrorText);
    end;


  scard.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.