Re: [Jython-users] execute python generated .exe from jython

[Kevin J. B. <jyt...@sa...>]

>
>
>From: kco...@cf...
>
>HELP>>>>I concede, I really don’t know what else to do. My dilemma……  I need to 
>unzip from jython.  The zip file is quite large with a directory structure. 
>(the zip file is apache 2.0.39)  My jython unzip.py is not handling the write 
>or read well; I’m doing something wrong with the input and output stream, I 
>gave up. 
>
The following works for me:

from java.util.zip import ZipFile
from java.io import *
import jarray

BUFSIZE=8192
def copy( input, output, bufsize=BUFSIZE ):
buffer = jarray.zeros( bufsize, 'b' )
total = 0
while 1:
bytesRead = input.read( buffer, 0, bufsize )
if bytesRead == -1:
break
else:
output.write( buffer, 0, bytesRead )
total = total + bytesRead
return total

def extract( filename, dest=None ):
zipfile = ZipFile( File( filename ), ZipFile.OPEN_READ )
try:
enum = zipfile.entries()
while enum.hasMoreElements():
entry = enum.nextElement()
name = entry.getName()
print name,
file = File( dest, name )
if entry.isDirectory():
print "directory"
file.mkdirs()
else:
input = zipfile.getInputStream( entry )
output = BufferedOutputStream( FileOutputStream( file ))
try:
size = copy( input, output )
print size, "bytes"
finally:
output.close()
finally:
zipfile.close()


if __name__ == "__main__":
import sys
extract( sys.argv[1] )

>So I created a python module that works wonderfully.  Pretty much the same code 
>as above. Because I am deploying to users and do not want to install python I 
>created a standalone unzip.exe.  Run this by itself, it works great.  My 
>problem is when I execute from jython the process does not finish, it just 
>hangs about half way through reading and write the files over the targetDir..  
>I’m not handling the 'process' correctly but I don’t know what to do.  
>
The problem is most likely that you're not reading the process's output 
as it runs, so its stdout buffer gets full, causing it to block. You're 
blocked waiting for the process to complete => deadlock. The os.system 
and os.popen* commands in Jython CVS handle this appropriately.

kb