How do I make my application trusted domain?

[joselias84]

Hello everyone
I made an application that creates a file, but always fails.
"java.lang.SecurityException: Access denied"

When I do Connection, have permission to write access,
but always fails.

"FileConnection fileConnection = (FileConnection) Connector.open("file:///C:/Data/hola.txt", Connector.READ_WRITE );"


I think I make my application reliable, but I do not know.
Someone can help me?

My code:

try
{
pForm.append("EscribirArchivo -");
FileConnection fileConnection = (FileConnection) Connector.open("file:///C:/Data/hola.txt", Connector.READ_WRITE );

if( fileConnection.exists() )
pForm.append("Archivo existe -");
else
{
pForm.append("Creando archivo -");
fileConnection.create();
pForm.append("Se ha creado -");
}

fileConnection.close();

}
catch(IOException e)
{
System.out.println("IOException in WriteToFile: " + e.toString());
}
catch(SecurityException e)
{
System.out.println("SecurityException in WriteToFile: " + e.toString());
}


Sorry if I write bad, I speak Spanish

[grahamhughes]

As for making your app "trusted", you should start by reading this. Signing is a complicated area, and is worth avoiding if possible.

Being "trusted" might not give you access to all parts of the file system. Trusted applications are still subject to security restrictions. There are documents and posts about this. Which parts of the file system you can access depends on the device. You didn't tell us what device you have.

You're English is OK! But if you prefer, there is a Spanish discussion board.

Graham.

[joselias84]

ok thanks
I have permission to read, because I see the folders, but I can not write

I will read the Links

Thanks

[grahamhughes]

You cannot write all folders. You may have permission to write some folders.

[joselias84]

for example

I am in C:/Data/

FileConnection  fileConnection = (FileConnection) Connector.open("file:///C:/Data/" );

if( fileConnection.canWrite())
{
    pForm.append("YES");
}
else
{
    pForm.append("NO");
}

The function returns true, but when I try to create the file does not work

fileConnection.create();

[grahamhughes]

You might like to read this.

What device are you using?

[joselias84]

thanks a lot

my problem was I try write in "file:///C:/Data/".

I try in "file:///C:/Data/Images/" and it works

Can I create a folder in Data, for my application?

Or only C:/Data/Images?

thanks

[grahamhughes]

No, you can only access a pre-defined set of folders.

If you tell me what device you are using, I might be able to tell you what folders you can access.

Graham.

[joselias84]

ok

I am using:

- Net Beans 6.5
- S60 3rd Edition SDK for symbian
- Nokia 5800
- Java JDK 6

thanks

[grahamhughes]

OK. Your application should have access to the folders determined by:

System.getProperty("fileconn.dir.photos");
System.getProperty("fileconn.dir.videos");
System.getProperty("fileconn.dir.graphics");
System.getProperty("fileconn.dir.tones");
System.getProperty("fileconn.dir.music");
System.getProperty("fileconn.dir.recordings");
System.getProperty("fileconn.dir.memorycard");
System.getProperty("fileconn.dir.private");

The last of these (fileconn.dir.private) should be available on your phone, but will not be available on all.

Graham.

[joselias84]

Ok , thanks

I want to save information from my application in these folders, in a file.

Is this the best option?
Is there a better option?

[grahamhughes]

That depends on the information.

If you want to store private information used only by your application, such as configuration settings, then use the RecordStore API (javax.microedition.rms.*).

See this document for a comparison of FileConnection and RMS, and information about using RMS.

Graham.

[joselias84]

Thanks a lot