[OCF] OCF programming problem

[cecile cheng]

I've a smart card applet class Purse, there are some static variable 
CLA_PURSE, INS_GET_BALANCE and a method getBalance just as follow:

public class Purse extends javacard.framework.Applet {

       private final static byte CLA_PURSE        = (byte)0x90;
       private final static byte INS_GET_BALANCE  = (byte)0x10;
                            .......
       public void process(APDU apdu) throws ISOException {
                           .......
       }
       private void getBalance( APDU apdu ) {
                            .......
       }
}
If i want to develop an OCF application to call the getBalance method, is 
that i must construct the CommandAPDU, 90 10 00 00 00, to call the 
getBalance method??

Is there any method that i could use OCF to call the getBalance function but 
no need to construct the Command APDU?

And, if i don't know the values of private final static byte CLA_PURSE and 
private final static byte INS_GET_BALANCE, then how can i construct the APDU 
or how can i get this value in the program?

Thanks for help!

Cecile

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