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POProblem Running Python Script in Java (Eclipse)
 

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  1. POProblem Running Python Script in Java (Eclipse)
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    <p>so yesterday I asked a question and I thought I had gotten my answer as everything seemed to work fine. I come back today to try and run my program and find nothing happens, and this time I am not getting any errors at all.</p> <p>To give you an idea of things, I've been looking to incorporate a Python Script a friend made for me into a Java application that I am trying to develop. After some trial and error I finally found out about 'Jython' and used the PythonInterpreter to try and run the script. </p> <p>However, upon trying to run it, I was getting an error within the Python Script. This was resolved by a suggestion a member of SO provided to change the "thisDir = getcwd()", or so I thought. Now I have no clue what could be wrong, the script works fine and does exactly what I need it to (extract all the images from the .docx files stored in its same directory) when I run it directly from the command line, so I don't know. Any ideas? </p> <p>Can someone help me out here? </p> <p><strong>Java:</strong></p> <pre><code>import org.python.core.PyException; import org.python.util.PythonInterpreter; public class SPImageExtractor { public static void main(String[] args) throws PyException { try { PythonInterpreter.initialize(System.getProperties(), System.getProperties(), new String[0]); PythonInterpreter interp = new PythonInterpreter(); interp.execfile("C:/Documents and Settings/user/workspace/Intern Project/Proposals/Converted Proposals/Image-Extractor2.py"); } catch(Exception e) { System.out.println(e.toString()); e.printStackTrace(); } } } </code></pre> <hr> <p><strong>Python:</strong></p> <pre><code>from os import path, chdir, listdir, mkdir, gcwd from sys import argv from zipfile import ZipFile from time import sleep #A few notes - #(1) when I do something like " _,variable = something ", that is because #the function returns two variables, and I only need one. I don't know if it is a #common convention to use the '_' symbol as the name for the unused variable, but #I saw it in some guy's code in the past, and I started using it. #(2) I use "path.join" because on unix operating systems and windows operating systems #they use different conventions for paths like '\' vs '/'. path.join works on all operating #systems for making paths. #Defines what extensions to look for within the file (you can add more to this) IMAGE_FILE_EXTENSIONS = ('.bmp', '.gif', '.jpg', '.jpeg', '.png', '.tif', '.tiff') #Changes to the directory in which this script is contained thisDir = gcwd() chdir(thisDir) #Lists all the files/folders in the directory fileList = listdir('.') for file in fileList: #Checks if the item is a file (opposed to being a folder) if path.isfile(file): #Fetches the files extension and checks if it is .docx _,fileExt = path.splitext(file) if fileExt == '.docx': #Creates directory for the images newDirectory = path.join(thisDir, file + "-Images") if not path.exists(newDirectory): mkdir(newDirectory) currentFile = open(file,"r") for line in currentFile: print line sleep(5) #Opens the file as if it is a zipfile #Then lists the contents try: zipFileHandle = ZipFile(file) nameList = zipFileHandle.namelist() for archivedFile in nameList: #Checks if the file extension is in the list defined above #And if it is, it extracts the file _,archiveExt = path.splitext(archivedFile) if archiveExt in IMAGE_FILE_EXTENSIONS: zipFileHandle.extract(archivedFile, newDirectory) except: pass </code></pre> <p><strong>EDIT</strong></p> <p>Just made some progress, so within Eclipse, when I run the Script by itself (not being called through java) as a "Python Run" everything works fine. However, when I do a "Jython Run" the script spazzes and it will create new directories for the images, however it will not extract the images themselves.</p> <p><strong>FINAL EDIT</strong></p> <p>Man, just screw crappy Jython. I just installed python into my path...</p> <pre><code>Runtime rt = Runtime.getRuntime(); Process pr = rt.exec("C:\\Python27\\python.exe \"C:\\Documents and Settings\\user\\workspace\\Intern Project\\Proposals\\Converted Proposals\\ImageExtractor2.py\""); </code></pre> <p>Bam, worked perfectly.</p> <p>Hope that helps someone out there.</p>
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    1. COI don't know if this is causing you any problems, but you're not importing the `getcwd` function. Your first line should read: `from os import path, chdir, listdir, mkdir, gcwd`
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    2. COHaha that was pretty dumb of me, but it still didn't do anything to display an error :(
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    3. COWhile your use of Process and exec() as shown might be working now, it is not guaranteed to always work. You are supposed to empty the I/O streams attached to the Process whether you need the data or not. In general, you should start a couple of threads that just keep reading the data out of the buffers until the process finishes, even if you do not intend to use the data.
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