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Editorial Team
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Asked: 2026-05-14T01:42:09+00:00

I’m writing a MIDlet which needs to write file. I’m using FileConnection from JSR-75

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I’m writing a MIDlet which needs to write file. I’m using FileConnection from JSR-75 to accomplish this.

The intention is to have this MIDlet runnning on as much devices as possible (all MIDP 2.0 devices with JSR-75 support, ideally).

On several emulators and an HTC Touch Pro2, I can perfectly use the following code to get the root of the filesystem:

Enumeration drives = FileSystemRegistry.listRoots();
String root = (String) drives.nextElement();
String path = "file:///" + root;

However, on a Nokia S60 5th edition emulator, trying to open a FileConnection to this path throws a java.lang.SecurityException. Apparently S60 devices do not allow connections to the root of the filesystem. I realise I can use something like System.getProperty(“fileconn.dir.photos”), but that isn’t supported on all devices either.

So, my actual question: what is the best approach to get a path to create a FileConnection with, that allows for maximum portability?

Thanks.

Edit:
I suppose I could iterate over all the roots in the Enumeration, and check for a writable one, but that’s hardly optimal for two reasons. First, there aren’t necessarily any writable roots. Second, this could be the phone memory or a memory card, so the storage method wouldn’t be consistent across devices, which is rather ugly.

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1 Answer

  1. Editorial Team

    You are supposed to open read-only connections to roots in order to find out what folder they contain.

    As a general rule, when opening a read_write connection to a folder throws a SecurityException, try to open a read-only connection to browse through sub-folders in order to find a writable one.

    Specifically on Symbian (and other platforms advanced enough to provide secure data cages to your MIDlets), you can use System.getProperty("fileconn.dir.private"); to find a writable area.

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