[Ikvm-developers] IKVM / Tika - DLL vs Executable

[Trevor W. <tw...@da...>]

Howdy folks,

I've recently found a java library called "Tika" which extracts metadata 
and content from various file types.  A great little library.

I used ikvmc.exe to convert it from the jar file to a dll usable in C# 
and after some struggles with which libraries and which types to use, 
got a test executable up and running.  It worked great!  Extracted 
metadata just like I needed it to.


I then copied the functions from the executable and put it into a DLL 
that will be used as a plug-in library for one of the projects I'm 
currently working on.  However (there's always a however, isn't there?), 
Tika instantly started reporting only 3 items (default properties of 
file length, file name and mime type) instead of the full metadata it 
currently does.

I'm not sure if this is a IKVM thing or a Tika thing, so am posting it 
here as well as on the Tika mailing lists.  Any assistance would be 
greatly appreciated.

I'm using C# in Visual Studio 2005 w/ IKVM 0.46.0.1 and Tika v0.9

The code for the extraction is:

         private void button1_Click(object sender, EventArgs e)
         {
             AutoDetectParser parser = new AutoDetectParser();
             Metadata metadata = new Metadata();
             ParseContext parserContext = new ParseContext();
             java.lang.Class parserClass = typeof(AutoDetectParser);

             parserContext.set(parserClass, parser);

             java.io.File file = new java.io.File(@"E:\temp\Docs for 
Demo SM\E-documents\011NewCaseDONE.doc");
             java.net.URL url = file.toURI().toURL();


             using (java.io.InputStream inputStream = 
MetadataHelper.getInputStream(url, metadata))
             {
                 parser.parse(inputStream, getTransformerHandler(), 
metadata, parserContext);
                 inputStream.close();
             }


             foreach (string name in metadata.names())
             {

             }
         }

         private TransformerHandler getTransformerHandler()
         {

             SAXTransformerFactory factory = 
TransformerFactory.newInstance() as SAXTransformerFactory;
             TransformerHandler handler = factory.newTransformerHandler();
             
handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "text");
             
handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");

             _outputWriter = new StringWriter();
             handler.setResult(new StreamResult(_outputWriter));
             return handler;
         }

and here are the using lines to make it work if you create a project

using System;
using System.Windows.Forms;

using java.io;
using java.lang;
using javax.xml.transform;
using javax.xml.transform.sax;
using javax.xml.transform.stream;
using org.apache.tika.io;
using org.apache.tika.metadata;
using org.apache.tika.parser;

------------------------------------------------------------

The DLL takes the code from the Button1_Click and moves it into a simple 
function that currently just tries to read it (no returns or anything at 
this time).

When run from the executable, i get the following information (vs an MP3 
file)
xmpDM:releaseDate=2009
Content-Length=4136960
xmpDM:audioChannelType=Stereo
xmpDM:album= Author=The B52's
xmpDM:artist=The B52's channels=2
xmpDM:audioSampleRate=44100
xmpDM:logComment=
xmpDM:trackNumber=1
version=MPEG 3 Layer III Version 1
xmpDM:composer=null
xmpDM:audioCompressor=MP3
title=Rock Lobster
samplerate=44100
xmpDM:genre=Blues
Content-Type=audio/mpeg
resourceName=The B52's - Rock Lobster.mp3

When run from the DLL i get the following information
Content-Length 4136960  |
Content-Type audio/mpeg  |
resourceName The B52's - Rock Lobster.mp3  |


Thanks in advance,

Trevor Watson