Help - extension for the binary download java

I was wondering if someone could look over what follows and say if I made a simple mistake somewhere in the java code. I wrote an extension to allow me to download a binary file by passing a URL to a web server and a destination file for storage on Board on the BB device.

She does not return errors in javascript, but it is not also download the file to the device.

I call from javascript.

csiFileIO.binImageLoader (imgName, filePath3);

where imgName is the complete URL to the file png on my Web server, and the filePath3 is the location of the file on the device.

And, Yes, the image is in the file config.xml in whitelist

Thanks in advance

package widgetpackage;

import org.w3c.dom.Document;

import net.rim.device.api.browser.field2.BrowserField;
import net.rim.device.api.script.ScriptEngine;
import net.rim.device.api.web.WidgetConfig;
import net.rim.device.api.web.WidgetExtension;

public final class csiFileIO implements WidgetExtension {

    public String[] getFeatureList() {

        String[] result = new String[1];
        result[0] = "csiFileIO";
        return result;
    }

    public void loadFeature(String feature, String version, Document doc,
            ScriptEngine scriptEngine) throws Exception {

        if (feature == "csiFileIO") {
            scriptEngine.addExtension("csiFileIO.binImageLoader", new binImageLoader());
            }

    }

    public void register(WidgetConfig arg0, BrowserField arg1) {
        // TODO Auto-generated method stub

    }

    public void unloadFeatures(Document arg0) {
        // TODO Auto-generated method stub

    }

}

package widgetpackage;

import net.rim.device.api.script.Scriptable;

public final class UpdateImage extends Scriptable { 

    public static final String FIELD_CHANGEICON = "binimageloader";
    private binImageLoader changer;

    public UpdateImage(){
        this.changer = new binImageLoader();
    }

    public Object getField(String name) throws Exception {                  

        if (name.equals(FIELD_CHANGEICON))
        {
            return this.changer;
        }

            return super.getField(name);
    }

}

package widgetpackage;

import java.io.*;

import javax.microedition.io.Connector;
import javax.microedition.io.file.*;
import javax.microedition.io.HttpConnection;

import java.io.IOException;
import net.rim.device.api.io.File;
import net.rim.device.api.script.ScriptableFunction;

public class binImageLoader extends ScriptableFunction {
    String url;
    String fdest;
    public Object invoke(Object obj, Object[] args) throws Exception {
        if (args.length == 2) {
            url   = ((String)args[0]).toString();
            fdest = ((String)args[1]).toString();
            }
    if (url != null ) {
      HttpConnection c = null;
      InputStream is = null;
      int rc;

      try {
          c = (HttpConnection)Connector.open(url);

          // Getting the response code will open the connection,
          // send the request, and read the HTTP response headers.
          // The headers are stored until requested.
          rc = c.getResponseCode();
          if (rc != HttpConnection.HTTP_OK) {
              throw new IOException("HTTP response code: " + rc);
          }

          is = c.openInputStream();

          // Get the length and process the data
          int len = (int)c.getLength();
          if (len > 0) {
               int actual = 0;
               int bytesread = 0 ;
               byte[] data = new byte[len];
               while ((bytesread != len) && (actual != -1)) {
                  actual = is.read(data, bytesread, len - bytesread);
                  bytesread += actual;
               }

               try {
                     FileConnection fconn = (FileConnection)Connector.open(fdest);
                     if (!fconn.exists()) {
                         fconn.create();  // create the file if it doesn't exist
                         DataOutputStream outstream;
                         outstream =fconn.openDataOutputStream();
                         outstream.write(data);
                         outstream.flush();
                         outstream.close();
                     }
                         fconn.close();
                 }
                 catch (IOException ioe) {
                 }

          }
      } catch (Throwable t)
        {
        }
      return UNDEFINED;
      }
    return obj;
    }
  }

Hey thanks for the suggestions. Using what described you I put in some return statements in error (catch blocks) handlers and has managed to reduce it to a my source web server 404 error.

I was able to run unmodified included code and with the method call as I had in the first post on a second web server, and it succeeds.

Thanks again for the pointer and I bought your book - look before you read.

Tags: BlackBerry Developers

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