.scr file and APDU

Question

I am using JCard sim, java card version 2.2.2 and I want to know how the .scr file is associated with the .java file. (the java card simulator on NetBeans IDE. I am not using an actual smartcard).

If someone can provide me with some useful links on how these two files are related, I would greatly appreciate it. I have looked through the following links, but they were not specifically helpful in illustrating how I can modify the .scr file in association with my .java file

C H A P T E R 5 - Converting Java Class Files

How to write a Java Card applet: A developer's guide - JavaWorld

Basically what I am trying to do is create a test applet (without the need of .scr files to send and receive APDUs by my other files) - I want to be able to read APDU which contains the the parameters for a function in my process method - That function will then create another APDU as its output, which another function will read as one of it's parameters

As far as I understand, the .scr file is used to send command APDUs that is read by the applet, but there is no way to write to the .scr file. How can I create my own .java test file that sends and receives APDUs instead of relying on the .scr? I can provide more details of what my code looks, if absolutely required.

Thanks

Answer 1

You can communicate with the simulator using the method described in the quick start guide of jCardSim. It is also described how to select an Applet using the correct AID in there. The inherited process(APDU) method will receive any APDU send using the methods described in the quick start guide, starting with the SELECT by NAME APDU (INS = A4). After that it is normal APDU processing.