Re: [OCF] The JavaWorld Example [URGENT]

[SCHAECK]

The Javaworld-Article that I published in 1998 was written when OCF 1.0 was
the current version of OCF. The samples don't run with OCF 1.2 without a
change. Please take the following code as an example instead:

(See attached file: sample.jar)

Best regards,

Thomas

Thomas Schaeck
Pervasive Computing Division - Extended e-business Solutions, EMEA
Phone: +49-(0)7031-16-3479   Mobile: +49-(0)171-6928407   e-mail:
[EMAIL PROTECTED]   Fax: +49-(0)7031-16-4888
Address: IBM Deutschland Entwicklung GmbH, Schoenaicher Str. 220, 71032
Boeblingen, Germany


"Paul Sheridan" <[EMAIL PROTECTED]> on 21.03.2000 19:02:12

Please respond to "Paul Sheridan" <[EMAIL PROTECTED]>

To:   [EMAIL PROTECTED]
cc:    (bcc: Thomas Schaeck/Germany/IBM)
Subject:  [OCF]  The JavaWorld Example [URGENT]




Dear members,
I have a few queries w.r.t. to the sample implementation of an Applet Proxy
Service as given on JavaWorld.com.

http://www.javaworld.com/javaworld/jw-10-1998/jw-10-javadev_p.html

source code as follows:

protected initialize(CardServiceScheduler scheduler, SmartCard card,
                     boolean blocking) throws CardServiceException
  {
    super (BUSINESS_CARD_AID, scheduler, card, blocking);
    try {
      allocateCardChannel();

...some more code....
    } finally {
      releaseCardChannel();
    }
}

Q1 - should the call to super () not be to super.initialize() ? when I try
compiling this code the compiler gives an error saying "Only constructors
can call constructors"...

Here is the code for exchanging an APDU with the card:

public String getField(int index, int field)
throws CardServiceException, CardTerminalException
{
  // Class and instruction byte for the get field command.
  final byte[] GET_FIELD_COMMAND_PREFIX = {(byte) 0x80, (byte) 0x02};
  try {
    allocateCardChannel();
    ...
    // Send command APDU and check the response.
    ResponseAPDU response = sendCommandAPDU(getCardChannel(),
                                            BUSINESS_CARD_AID,
                                            getFieldAPDU);
    switch (response.sw() & 0xFFFF) {
    case OK :
      return new String(response.data());
    case INDEX_OUT_OF_RANGE :
      throw new CardServiceInvalidParameterException("Index out of range");
    default :
      throw new CardServiceUnexpectedResponseException("RC=" +
response.sw());
    }
  } finally {
    releaseCardChannel();
  }
}

Q2 - in OCF 1.2 CardChannel's only sendCommandAPDU method takes only a
CommandAPDU parameter.  I have written my own CardService which
instantiates correctly etc., but throws an InvalidCardChannelException when
trying to send the APDU.  Does the CardChannel have to be allocated each
method invocation, or should the one allocated in the initialize method be
stored in some member reference and re-used ?

Here is one example of the offending code:

public boolean doCHV(String PIN)
     throws CardServiceException, CardTerminalException
{
     try {
     allocateCardChannel();

     //  Class and instruction byte for get command
     final byte[] CHV_COMMAND_PREFIX = {(byte) 0x03, (byte) 0x50};

     //  Set up the CommandAPDU
     CommandAPDU doCHVAPDU = new CommandAPDU(9);
     doCHVAPDU.append(CHV_COMMAND_PREFIX);
     doCHVAPDU.append((byte) 0x00); //  reserved
     doCHVAPDU.append((byte) 0x00); //  reserved
     doCHVAPDU.append((byte) 0x04);
     doCHVAPDU.append(ByteString.StrToByte(PIN));  //  placeholder for PIN

     //  Send the APDU and check the response
     ResponseAPDU response = sendCommandAPDU(doCHVAPDU);

     switch (response.sw() & 0xFFFF)
     {
          case OK:
               getMedicalCardState().setCHVPerformed(true);
               return true;
          case INVALID_CHV:
               getMedicalCardState().setCHVPerformed(true);
               return false;
          case PUK_REQUIRED:
               getMedicalCardState().setCardBlocked(true);
               throw new CardServiceException("Card is blocked");
          default:
               throw new CardServiceUnexpectedResponseException("RC=" +
response.sw());
             }
     }
          finally {
               releaseCardChannel();
          }
     }

Sorry for such a long post but I need this fixed ASAP,
Regards
Paul Sheridan


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