With regard to the NNTP protocol

Hi guys, I'm new on the development of network and the blackberry platform. I am developing a NNTP Reader on my blackberry by Socket connection.

Here are some of my code

final class _mainScreen extends MainScreen {
    private static String URL = "socket://news.microsoft.com:119;deviceside=false";

    public _mainScreen(){
        super();
        LabelField title = new LabelField("Welcome to myNewsgroup", LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
        setTitle(title);
        try {
        StreamConnection conn = null;
        conn = (StreamConnection)Connector.open(URL);

        OutputStreamWriter _out = new OutputStreamWriter(conn.openOutputStream());
        String data = "LIST\r\n";
        int length = data.length();
        _out.write(data, 0, length);

        InputStreamReader _in = new InputStreamReader(conn.openInputStream());
        char[] input = new char[length];
        for ( int i = 0; i < length; ++i ) {
            input[i] = (char)_in.read();
        };
        _in.close();
        _out.close();
        conn.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            //Dialog.alert("Error!");
            e.printStackTrace();
        }
    }

But the code does not work, it will freeze in the similator. Any ideas? Thank you!

In fact, I wonder what kind of network connection should I use?

Steve

Your Simulator is the gel because you call a blocking method of e/s on the UI thread. To avoid this deadlock, you must perform the operation of network on a different thread.

Regarding the connection, try using the interface SocketConnection. I've never needed to use one before, but here's a rough example of how I would do it:

package nntp;

class NNTPConnection extends Thread{    public void main(String[] args)    {        NTTPConnection query = new NTTPConnection("news.microsoft.com", "List\r\n");

        // Start the query thread.        query.start();    }

    NNTPConnection(String host, String command)    {        this.m_host = host;        this.m_command = command;    }

    private final String m_command;    private final String m_host;

    public void run()    {        this.getResponse("socket://" + this.m_host + ":119", this.m_command);    }

    private char[] getResponse(String address, String command)    {        SocketConnection conn = null;        OutputStreamWriter writer = null;        InputStreamReader reader = null;        char[] response;

        try        {            conn = (StreamConnection) Connector.open(address);            conn.setSocketOption(SocketConnection.LINGER, 10);

            writer = new OutputStreamWriter(conn.openOutputStream(), "UTF8");            writer.write(command);            writer.write();

            reader = new InputStreamReader(conn.openInputStream(), "UTF8");

            // Create a buffer to store the data in.            DataBuffer buffer = new DataBuffer();            int length = 0;            int ch = 0;            while (ch != 1)            {                // get the next char from teh stream.                 ch = reader.read();

                // Add the character to the buffer.                buffer.writeChar(ch);

                // Keep a count of how many chars we're writing to the buffer                length++;            }

            // intialize the array we're returning to the number of chars we put in our buffer.            response = new char[length];

            // Start at the very beginning  I hear it's a very good place to start.            buffer.rewind();

            for (int i = 0; i <= length; i++)            {                response[i] = buffer.readChar();            }        }        catch (IOException ex)        {            // Whoops.        }        finally        {            try            {                if (writer != null)                    writer.close();                if (reader != null)                    reader.close();                if (conn != null)                    conn.close();            }            catch (IOException e)            {                // Couldn't cloase a stream. That can't be good.            }        }

        return response;    }}

After you set this class whenever you want to submit a NNTP request you would simply initialize an instance of this class and run the legacy of java.lang.Thread method of 'start' to run your query without freezing your program.

Edit: Fixed a misspelling in my code.

Tags: BlackBerry Developers

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