RE: [Jython-users] start a Window2K program in a separate window andbackto Jython

[Yang W. <yw...@pr...>]

Kevin,

Thanks for your reponse.  Of the two suggestions, the first one got me
an error:
>>> import java
>>> import java.lang
>>> import os
>>> java.lang.Runtime.getRuntime().exec("start StartDmServices.bat")
Traceback (innermost last):
  File "<console>", line 1, in ?
java.io.IOException: CreateProcess: start StartDmServices.bat error=3D2
        at java.lang.Win32Process.create(Native Method)
        at java.lang.Win32Process.<init>(Win32Process.java:66)
        at java.lang.Runtime.execInternal(Native Method)
        at java.lang.Runtime.exec(Runtime.java:551)
        at java.lang.Runtime.exec(Runtime.java:418)
        at java.lang.Runtime.exec(Runtime.java:361)
        at java.lang.Runtime.exec(Runtime.java:325)
        at java.lang.reflect.Method.invoke(Native Method)
        at
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java
)
        at org.python.core.PyMethod.__call__(PyMethod.java)
        at org.python.core.PyObject.__call__(PyObject.java)
        at org.python.core.PyInstance.invoke(PyInstance.java)
        at org.python.pycode._pyx5.f$0(<console>:1)
        at org.python.pycode._pyx5.call_function(<console>)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)
        at org.python.core.Py.runCode(Py.java)
        at org.python.core.Py.exec(Py.java)
        at
org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
        at
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter
.java)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpret
er.java)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpret
er.java)
        at
org.python.util.InteractiveConsole.push(InteractiveConsole.java)
        at
org.python.util.InteractiveConsole.interact(InteractiveConsole.java)
        at org.python.util.jython.main(jython.java)

java.io.IOException: java.io.IOException: CreateProcess: start
StartDmServices.b
at error=3D2

I did "start StartDmServices.bat" in DOS window and it works.
Then I used a non existing bat file and surprise, got the same error:
>>> java.lang.Runtime.getRuntime().exec("start NoExist.bat")
Traceback (innermost last):
  File "<console>", line 1, in ?
java.io.IOException: CreateProcess: start NoExist.bat error=3D2
        at java.lang.Win32Process.create(Native Method)
        at java.lang.Win32Process.<init>(Win32Process.java:66)
        at java.lang.Runtime.execInternal(Native Method)
        at java.lang.Runtime.exec(Runtime.java:551)
        at java.lang.Runtime.exec(Runtime.java:418)
        at java.lang.Runtime.exec(Runtime.java:361)
        at java.lang.Runtime.exec(Runtime.java:325)
        at java.lang.reflect.Method.invoke(Native Method)
        at
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java
)
        at org.python.core.PyMethod.__call__(PyMethod.java)
        at org.python.core.PyObject.__call__(PyObject.java)
        at org.python.core.PyInstance.invoke(PyInstance.java)
        at org.python.pycode._pyx6.f$0(<console>:1)
        at org.python.pycode._pyx6.call_function(<console>)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)
        at org.python.core.Py.runCode(Py.java)
        at org.python.core.Py.exec(Py.java)
        at
org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
        at
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter
.java)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpret
er.java)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpret
er.java)
        at
org.python.util.InteractiveConsole.push(InteractiveConsole.java)
        at
org.python.util.InteractiveConsole.interact(InteractiveConsole.java)
        at org.python.util.jython.main(jython.java)

java.io.IOException: java.io.IOException: CreateProcess: start
NoExist.bat error
=3D2

But I checked the bat file name again and again and with cap/uncap.  All
got the same error.

I really appreciate if you can point to what I did wrong.  Thanks!

BTW, the second method (start a new thread) works but the problem is
that the output crowds the window.  It is kind of inconvenient when
working in interactive mode.

Yang
-----Original Message-----
From: Kevin Butler [mailto:kb...@ca...]
Sent: Monday, February 11, 2002 7:53 AM
To: Yang Wang
Cc: jyt...@li...
Subject: Re: [Jython-users] start a Window2K program in a separate
window andbackto Jython


Yang Wang wrote:
>=20
> Hi All,
>=20
> I am trying to use os.system("start mine.bat") to start a program in a
> separate window. But the problem is that the control remains in the
new
> window and did not go back to the Jython window at all.  Until I exit
> the "mine.bat", the prompt in Jython began to show up.

From "help start" on NT/4:
> When executing an application that is a 32-bit GUI application,
CMD.EXE
>    does not wait for the application to terminate before returning to
>    the command prompt.  This new behavior does NOT occur if executing
>    within a command script.

> Did I use the right command to do this? =20

Yes.  Maybe.

system() starts a command and waits for it to complete.

> I looked at other Python
> commands such as os.execl() but when I try it on Jython, it would say
> that "AttributeError: class 'org.python.modules.os' has no attribute
> 'execl'".

RSN I'll implement the os.exec() functions, but I haven't gotten around
to it yet.

Currently, to have your app continue running after launching the
command, you can either:

	- run the command as java.lang.runtime.getRuntime().exec([
"cmd.exe", "/c", "mine.bat" ])
	- run system in a separate thread as thread.start_new_thread(
os.system, ("mine.bat",))

Note that either approach may leave your jython application without the
focus (depends on what the MS Window Manager decides to do), so you may
need to add a "setFocus" command to your jython GUI application.

kb

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