Can I share Attributes/Variables between 2 different Class Driver Sessions?

I am designing a Simulator of Instrumentation following these steps:
1) re-programming, re-compiling, and re-building the DLLs from the advanced class simulation drivers included in IVI Driver Toolset 2.0 using LabWindows/CVI 7.0;
2) then i create a VI in LabVIEW 7.0 which calls an IVI Class Driver obtaining the desired simulated output data.
My problem is that I need to share variables between different DLLs in LabVIEW.
I want to simulate a circuit which consists of a battery and a resistor. I've got 2 instruments: a DC Power Supply and a Digital Multimeter.
The DC Power Supply acts as the battery providing a certain voltage level, and the Multimeter measures the Voltage and the Current in the resistor.
I've designed a VI in LabVIEW which uses 2 different sessions: one which calls the class driver IviDCPwr, and the other one which calls IviDmm.
I wish to be able to access the attributes from "nisDCPwr.c" in the file "nisDmm.c".
For example, to write a line like this:
Ivi_GetAttributeViReal64 (ViSession vi, ViConstString channelName, NISDCPWR_ATTR_MEASUREMENT_BASEV, 0, &reading));
inside the source code "nisDmm.c" of the advanced class simulation driver.
The problem is that the only ViSession accessible from nisDmm is the handle from the Digital Multimeter, but not from DC Power Supply.
Would this be possible? Is it "legal"?
I've tried another approach through the declaration of external variables, but unfortunately I get a run-time error in LabVIEW.
The only solution I've found is using auxiliary files going between, through the functions included in the Low Level I/O Library .
Nevertheless, the solution proposed above would result much more convenient, faster and safer in my application.
I hope everyone has understood my question, and anyone can help.
THANK YOU VERY MUCH FOR YOUR TIME!!!

Doesn't anyone have an answer?
Or any proposal?
Or even a clue?
THANKS!

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How can I share Pin variable between two packages?

Hi every one,
Is there any one who knows how can I share Pin variable that it is defined with OwnerPin between two packages in java card( with eclipse 3.1),I studied Sharing Interface subject and I knows it teorical but I can not do it practical .
I can share primitive data type but I can not share Ownerpin.
If anybody has some sample codes or knows any link ,please inform me.
My code is same as below:
//In Server Side
package ginaPack;
import javacard.framework.*;
public class GinaApplet extends Applet implements GinaInterface{
OwnerPIN pin;
private GinaApplet (byte[] bArray,short bOffset,byte bLength) {
    pin =new OwnerPIN(PIN_TRY_LIMIT,MAX_PIN_SIZE);
          byte PinTemp[] = new byte[4];
          PinTemp[0] = (byte) 0x31;
          PinTemp[1] = (byte) 0x31;
          PinTemp[2] = (byte) 0x31;
          PinTemp[3] = (byte) 0x31;
          pin.update(PinTemp, (short) (0), (byte) PinTemp.length);
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    public OwnerPIN getPinShareable()
         return pin;
     public void process(APDU apdu)
                  //there are some codes in this here
}//Interface in Server side
public interface GinaInterface extends Shareable
      public OwnerPIN getPinShareable();
}//In Client side
import ginaPack.*;
public class UserCardApplet extends Applet {
private UserCardApplet(byte[] bArray, short bOffset, byte bLength) {
     //there are some codes in this here
public boolean select() {
          final byte[] Gina_AID={(byte)0x47,(byte)0x69,(byte)0x6e,(byte)0x61,(byte)0x41,(byte)0x70,(byte)0x70,(byte)0x6c,(byte)0x65,(byte)0x74};
          AID GinaAID = JCSystem.lookupAID( Gina_AID, ( short )0,( byte )Gina_AID.length );
          if ( GinaAID == null ) // probably not loaded on card
                    ISOException.throwIt( ISO7816.SW_FUNC_NOT_SUPPORTED );//6a 80
          GinaInterface ff = (GinaInterface) JCSystem.getAppletShareableInterfaceObject(GinaAID,(byte)0);
          if( ff == null )
               ISOException.throwIt((short)0x0903);
if ( ff.getPinShareable().getTriesRemaining()== 0 ) return false;
}My problem is in this line :
"if ( ff.getPinShareable().getTriesRemaining()== 0 ) return false; "when I select my applet this line throw an exception, ff.getPinshareable includes all of OwnerPin methods(such as getTriesRemaining ,check ,reset, update ,...)but all of them throw exception .
I think firewal does not allow other packages uses this methods .If my guess is right then what should I do for sharing the variables that they are defined with non primitive data type such as (OwnerPin,Signature,...)
I'd appriciated for any help.
yours sincerely,
Orchid.
Message was edited by:
NewOrchid

Applet 1:
package com.package1;
import javacard.framework.*;
public class Applet1 extends Applet {
    private static final byte tryLimit = (byte)3;
    private static byte[] pinBytes = {(byte)1, (byte)7, (byte)4, (byte)5, (byte)2};
    private Library1 lib;
    protected Applet1(byte bArray[], short bOffset, byte bLength) throws PINException {
        lib= new Library1(tryLimit, (byte)pinBytes.length);
        lib.update(pinBytes, (short)0, (byte)pinBytes.length);
        register();
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new Applet1(bArray, bOffset, bLength);
    public void process(APDU apdu) {
        byte status=(byte)0;
        lib.resetAndUnblock();
        if (!(lib instanceof Shareable)) status += (byte)2;
        if (!(lib instanceof MyPIN)) status += (byte)4;
        ISOException.throwIt(Util.makeShort((byte)0x90, status)); // sw indicates tries remaining
    public Shareable getShareableInterfaceObject(AID cltAID, byte parm) {
        return lib;
}Library1:
package com.package1;
import javacard.framework.OwnerPIN;
import javacard.framework.PINException;
public class Library1 extends OwnerPIN implements Interface1{
    public Library1(byte tryLimit, byte maxPINSize) throws PINException {
        super(tryLimit, maxPINSize);
}Interface1:
package com.package1;
import javacard.framework.PIN;
import javacard.framework.Shareable;
public interface Interface1 extends Shareable {
    boolean check(byte[] pin, short offset, byte length);
    byte getTriesRemaining();
    boolean isValidated();
    void reset();
}Applet2:
package com.package2;
import javacard.framework.*;
import com.package1;
public class Applet2 extends Applet {
    private final static byte CLA_TEST = (byte)0x80;
    private final static byte INS_TEST = (byte)0x20;
    private final static byte P1_AUTHORIZE = (byte)0x00;
    private final static byte P1_DOIT = (byte)0x01;
    private final static byte P1_CHECK_SIO = (byte)0x0a;
    private Interface1 sio;
    protected Applet2(byte bArray[], short bOffset, byte bLength) {
        register();
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new Applet2(bArray, bOffset, bLength);
    public void process(APDU apdu) {
     byte[] buffer = apdu.getBuffer();
        if ((buffer[ISO7816.OFFSET_CLA] == CLA_TEST) ||
            (buffer[ISO7816.OFFSET_CLA] == ISO7816.CLA_ISO7816)) {
            short bytesReceived = apdu.setIncomingAndReceive();
            switch (buffer[ISO7816.OFFSET_INS]) {
            case ISO7816.INS_SELECT:
                if (!JCSystem.getAID().equals(buffer, ISO7816.OFFSET_CDATA, buffer[ISO7816.OFFSET_LC]))
                    ISOException.throwIt(ISO7816.SW_APPLET_SELECT_FAILED);
                sio = (Library1)JCSystem.getAppletShareableInterfaceObject(JCSystem.lookupAID(<fill in parameters>);
                if (sio == null)
                    ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
                break;
            case INS_TEST:
                switch (buffer[ISO7816.OFFSET_P1]) {
                case P1_AUTHORIZE:
                    if (!sio.isValidated()) {
                        if(!sio.check(buffer, ISO7816.OFFSET_CDATA, buffer[ISO7816.OFFSET_LC]))
                            ISOException.throwIt(Util.makeShort((byte)0x9A, sio.getTriesRemaining()));
                    break;
                case P1_DOIT:
                    if (!sio.isValidated())
                        ISOException.throwIt(ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
                    sio.reset();
                    ISOException.throwIt(Util.makeShort((byte)0x9A, sio.getTriesRemaining()));
                    break;
                default:
                    ISOException.throwIt(ISO7816.SW_INCORRECT_P1P2);
                break;
            default:
                ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
        else {
            ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
}1. Upload package1
2. Install Applet1
3. Select Applet1
4. Upload package2
5. Install Applet2
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