File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java Micro Edition and the fly likes Reading file from memory card Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Mobile » Java Micro Edition
Bookmark "Reading file from memory card" Watch "Reading file from memory card" New topic

Reading file from memory card

Mike Dikun

Joined: Feb 18, 2004
Posts: 5
I need to store a large amount of data on a memory card in files and then access it from a midlet.......
I should mention I am testing this on a Palm Tungsten C and a SD memory card.
The File Connection Optional Package is not available on the JVM i'm using.....
So i'm trying to use the basic Connector class with a InputStream
I am unable to read from any files on the memory card using the following code.
InputConnection conn = null;
DataInputStream dis = null;
StringBuffer sb = new StringBuffer();
String url = "file:///CardName/file.txt";

for(int i =0;i<urls.length;i++){
try {
conn =(InputConnection) url,Connector.READ);
DataInputStream is = conn.openDataInputStream();
sb.append("AAAAAAAA" + is.available());
catch( IOException ioe ){
sb.append(i + "Reg InputConnection: " + url+ "\n" + ioe.getMessage());

I cannot use the RMS packages, as I need to store the data on a memory card and it writes it to the Palms main memory and not the card....
Does anybody know how to read files from a memory card? (using j2me of course)
Michael Yuan
Ranch Hand

Joined: Mar 07, 2002
Posts: 1427
Without the File Connection OP, there is no standard way to do that -- the "file://" style url would cause an exception. I recall the IBM JVM for Palm has a small library that wraps most of the Palm native calls. I cannot remember its name (or its content) at this moment. But you might be able to find some thin wrapper over the native file I/O there.

Seam Framework:
I agree. Here's the link:
subject: Reading file from memory card
It's not a secret anymore!