Re: [Jython-users] Embedding question again..?

[Robert W. B. <rb...@di...>]

Hello Pulak,

On Mon, 20 Aug 2001, Pulak Piplani (UAB) wrote:
> Hi,
>
>  I am tring to use Jython for a scripting application to configure a External Device.
>
> The idea is  to provide user the flexibility of writing scripts in jython while the GUI and other aspects of external communications etc are handled in Java.
>
>  Once the GUI is ready and the communication class is instantiated the control will be passes to a jython script.
>
>  The communication Object ( which is a java object) will be passes on to the Jython script which will then call "Send(Command)" interface for example.
>
>
> To do I am doing the following
>
> Java side
> --------------
> //jptComm object is already instantiated and setup. It has an interface send(string).
>
> PythonInterpreter interp = new PythonInterpreter();
>     try{
>         interp.execfile(fileName); // where filename is the name of jython script ( runscript.py)
>     }
>     catch( PyException except)
>     {
>       System.out.println("Error occured in exec file");
>     }
>     try{
>          interp.exec("run(jptComm)"); // where the jptComm in the communication object.

How did the interpreter get the identifier "jptComm"?  Maybe a "set" is
missing- see end.

>           //interp.exec("run(2)"); //instead if I pass builtin types like int or string it works fine.
>     }
>     catch( PyException except)
>     {
>       System.out.println("Error occured in EXEC");
>       System.out.println(except.toString());
>     }
>   }
> __________________________________________________________________________________
>
>
> Jython side
> ---------------
>
>
> import java
> import jpitool.jpitoolCommunicator
>
> def run(jcp):
> 	print 'xyz'
> 	#jcp.send('ls')
>
>
> if __name__ == '__main__':
> 	run(2)

Still no jptComm identifier set. This is starting to look suspicious.

<snip>
> Error occured in EXEC
> Traceback (innermost last):
>   File "<string>", line 1, in ?
> NameError: jptComm

I'm usure what object jptComm is, but here's my guesses:

1. jptComm is an object that should be created in the Jython script- maybe
an instance of jpitoolCommunicator. If this is the case, change the Jython
code to the following:

===================================
import java
import jpitool.jpitoolCommunicator

jptComm = jpitool.jpitoolCommunicator(someargs)  # <--create jptComm

def run(jcp):
    print 'xyz'

if __name__ == '__main__':
    run(2)
===================================

2. jptComm is a Java object that did not get set in the interpreter. If
this is the case, add a "set" method previous to the call to
interp.exec("run(jptComm)") like the following:


interp.set("jptComm", myjptCommObject);
interp.exec("run(jptComm)");


either way, jptComm is defined before you use it in the run
function, which is the fix.

Cheers,
Robert