FTP2ME

[borhane]

I wish to send a file from one server to my phone. For this, I use the function call

public void retr(java.io.OutputStream outputStream,
                 java.lang.String filename)

Here's what the technical documentation said about it :

public void retr(java.io.OutputStream outputStream,
java.lang.String filename)
throws java.io.IOException,
FtpProtocolException

Retrieve This command causes the server-DTP to transfer a copy of the file, specified in the pathname, to the server- or user-DTP at the other end of the data connection. The status and contents of the file at the server site shall be unaffected.

Throws:
java.io.IOException
FtpProtocolException

My problem is that the program stops at this function (retr).

Here is my program :

 try {
            ftpcon = new Ftp2Me(host, port, user, pass);
            String cheminftp = ftpcon.pwd() ; // to know the working directory of my server

           
            String url = "file:///Mes images/ftppp2.txt" ; // ftppp2 it's the path of the file I want to create

            OutputStream os = Connector.openOutputStream(url) ;
            StreamConnection sc = null ;
            sc =        (StreamConnection) Connector.open(url) ;
            os = sc.openOutputStream() ;
            DataOutputStream dos = new DataOutputStream(os) ;

            ftpcon.retr(dos,cheminftp+"/text.txt") ; //I think the problem is here with 'dos'
   
            } catch (IOException ex) {
                ex.printStackTrace();
           } catch (FtpProtocolException ex) {
                ex.printStackTrace();
           }

Do I use correctely the function "OutputStream" and "StreamConnection" ?

Thank you in advance.

Borhane. (French Student).

[ektasrv]

I wish to send a file from one server to my phone

Please explain what are you trying to --> Send a file from your PC to your mobile phone ?
or From Phone to PC ?

You want to do it over internet ? using GSM network - GPRS data transfer?

[borhane]

I traying to send a file (.txt) from my SERVER to my mobile phone - with FTP (using a package called FTP2ME)

[ektasrv]

here is a small correction in your code:

try {
            ftpcon = new Ftp2Me(host, port, user, pass);
            String cheminftp = ftpcon.pwd() ; // to know the working directory of my server

           
            String url = "file:///Mes images/ftppp2.txt" ; // ftppp2 it's the path of the file I want to create

            OutputStream os = null; //Connector.openOutputStream(url) ;
            StreamConnection sc = null ;
            sc =        (StreamConnection) Connector.open(url) ; // this line is trying to open connection to filesystem - no use here
            os = sc.openOutputStream() ; // Optput Stream should be opened on ftpcon
            DataOutputStream dos = new DataOutputStream(os) ;

            ftpcon.retr(dos,cheminftp+"/text.txt") ; //I think the problem is here with 'dos'
   
            } catch (IOException ex) {
                ex.printStackTrace();
           } catch (FtpProtocolException ex) {
                ex.printStackTrace();
           }

Check the documentation of FTP2ME.... your code is doing something else...

[borhane]

No its not working. but I think the problem comes from here :

OutputStream os = Connector.openOutputStream(url) ;
StreamConnection sc = null ;
sc = (StreamConnection) Connector.open(url) ;
os = sc.openOutputStream() ;
DataOutputStream dos = new DataOutputStream(os) ;

Here is the link to see the documentation package FTP2ME : http://www.koders.com/java/fid9FDA18...spx?s=226#L145

[ektasrv]

FTP2me is project is to create a J2ME (CLDC 1.0, MIDP 2.0) compatible ftp client library. The main component of the library is a class named Ftp2Me. It implements all of the ftp commands described in RFC959.

The purpose is to connect to a FTP server and download a file from the server to the client (mobile).
You can program it like this:

try {
            ftpcon = new Ftp2Me(host, port, user, pass);
            String cheminftp = ftpcon.pwd() ; // to know the working directory of my server
         
            String url = "file:///Mes images/ftppp2.txt" ; // ftppp2 it's the path of the file I want to create on the mobile phone using JSR 75 FCA API

            FileConnection fconn = (FileConnection)Connector.open(url);
            if (!fconn.exists()) fconn.create();  // create the file if it doesn't exist
            OutputStream os = fconn.openOutputStream() ;

            ftpcon.retr(os,cheminftp+"/text.txt") ; // It needs OS only not DOS
   
// The above line retr, fetchs the text.txt file from server and writes it to OutputStream i.e. on the file system

           fconn.close();

            } catch (Exception e) {
                ex.printStackTrace();
           } catch (FtpProtocolException ex) {
                ex.printStackTrace();
           }

Try this code, it will work if you have the permissions to write to the target folder on the device and if your text.txt exist on the FTP server.

I could write this code after reading the implementation of retr method of FTP2ME

public void retr(OutputStream outputStream, String filename) throws IOException, FtpProtocolException {
        PasvInfo pi = pasv();

        sendLine("RETR " + filename);

        SocketConnection dataInput = (SocketConnection) Connector.open("socket://"+pi.ip+":"+pi.port);
        
        expectResponse(150);

        InputStream in = dataInput.openInputStream();

        byte[] buffer = new byte[128];
        int bytesRead = 0;
        while ((bytesRead = in.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        in.close();
        outputStream.close();
        dataInput.close();

        expectResponse(226);
    }

[borhane]

It's almost good : except that the file created is empty !

[borhane]

I added these lines : (but its not working)

... ...
path = System.getProperty(photos);
String url = path + "ftppp2.txt";
ftpcon.cwd("/ppmob") ;
... ...
ftpcon.type('A') ; //Select the type ASCII

[ektasrv]

If you are using FTP2ME library, use its source code in your project and try to print (SOP) the data read in retr() method before its written to the filesystem outputstream - see if you get the data.

We need to identify if the issue is on the FTP server side or the client side Filesystem.

[borhane]

thank you for your advice.
After hours of searching I found nothing.
I think the problem comes from the phone and not the server.

I wonder how can we know the path to any directory on the phone ? Without using :

String path = System.getProperty (fileconn.dir.photos);

Thank you very much.