Reading of texts

Apologize if this sounds like a newbie quesiton.

I tried to read the string in the file that is located in the /res folder. This code is based on the following knowledge base:

http://www.BlackBerry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800620/How_To _...

Now, I have tried the code in the Knowledge Base, and it was working fine. I want to code a little, so I have the app in a form, which contains labelfield and a button field. When the button is clicked, I want to read the file.

The code is as follows:

public class ReadTextFile extends UiApplication {
    public static void main (String args[]){
        ReadTextFile app = new ReadTextFile ();
        app.enterEventDispatcher();
    }

    public ReadTextFile(){
        pushScreen(new ReadTextScreen());
    }

}

final class ReadTextScreen extends MainScreen{

    public ReadTextScreen(){
        setTitle(new LabelField("Test Reading File"));
        LabelField labelFld = new LabelField("Click Button");
        add(labelFld);
        ButtonField readButtonFld = new ButtonField("Read");
        readButtonFld.setChangeListener( new FieldChangeListener() {

            public void fieldChanged(Field arg0, int arg1) {
                TextRetriever r = new TextRetriever("text.txt");
                Dialog.inform("Reading success! " + r.getString());
            }
        });

        add(readButtonFld);
    }
}

TextRetriever.java:

public class TextRetriever {
    private String _filename;
    private String _read;

    public TextRetriever(String filename){
        _filename = filename;
        _read = "";
        run();
    }

    private void run(){
        try {
            Class claz = Class.forName("net.realnetworks.blackberry.tutorial.TextRetriever");
            InputStream is = claz.getResourceAsStream("/" + _filename);
            InputStreamReader reader = new InputStreamReader(is);
            char c;

            while ((c = (char)reader.read()) != -1) {
                _read = _read + c;
//                System.out.print(c);
            }
            reader.close();
            is.close();
        } catch (Exception e) {
            System.out.println("Error in reading text.txt. Error: " + e.toString());
            //e.printStackTrace();
        }
    }

    public String getString(){
        return _read;
    }

}

When I tried the code in the BlackBerry Simulator, and when I clicked on the button, the process seems to run forever. I was looking at the console, he printed a lot of things I did not understand, such as...

JVM: bklt[1] @261804: idle 15
JVM: bklt @261804: setTimer 15
VM:PFLAs=1e000
VM:+GC(f)w=20
VM:-GCt=10,b=0,r=0,g=f,w=20
VM:QUOT t=1
VM:+CR
VM:-CR=0
VM:+RP!w=14,a=29M,s=8.1K
VM:+GC(r)w=5
VM:-GCt=10,b=0,r=0,g=r,w=5
VM:-RP!s=37.7M
VM:PCSTt=0,m=1,o=7,n=7,b=2592934,a=2592934

Which prints over and over again. Where am I wrong? The code looks ok to me.

    // Coded as a static 'helper' method that may be used from other classes
    public final static byte [] readDataFile(String fileName) {
        System.out.println("Reading file from cod: " + fileName);
        InputStream is = null;
        byte [] response;
        try {
            // The class name is the fully qualified package name followed
            // by the actual name of this class
            Class classs = Class.forName("net.realnetworks.blackberry.tutorial.TextRetriever");
            // to actually retrieve the resource, prefix the name of the file with a "/"
            is = classs.getResourceAsStream("/" + _filename);
            //we now have an input stream.
            response = IOUtilities.streamToBytes(is);
            return response;
        } catch(Exception ex) {
            System.out.println("Exception reading file: " + fileName + " : " + ex.toString());
            return null;
        } finally {
            try {
                if ( is != null ) {
                    is.close();
                }
                is = null;
            } catch (Exception e) {
            }
        }
    }

Can't see anything obviously wrong with your code, you have reinforced with her.

But I must say that this is not the best piece of code I've seen, especially because of the way you concatenate the string. Because strings are immutable, this will result in a large number of objects String is created and discarded, which would explain Garbage collection, you see.

(the line in the journal "VM: + GC (f) w = 20" is, I think, a full garbage collection)

Above is a code I knocked up which will return the data as a byte stream file more efficiently your code I think. You need a new String (response) to get the string. Note that there is no need to create an object to do this - you just need to run code, so a static method is fine (and more effective).

Note that this code that I have written, not tested, may not work, you get the picture...

Ed. Sorry, inserted forum code before the notes!

Tags: BlackBerry Developers

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