applet for accessing the clients files

[BayK]

Hi!

I have tried to create an applet which is able to access the clients file system.

The applet should be able to check the size of a file before uploading it. Therefore it should be able to be accessd via LiveConnect (javascript)...

The problem I have is that I a com.ms.security.SecurityExceptionEx[Unknown] is thrown when I try to access the file.

ps: the applet is signed with a valid signature

Everytime I call the function below with javascript I get the following error:

com.ms.security.SecurityExceptionEx[Unknown]: cannot access file C:\wsinst.log
	at com/ms/security/permissions/FileIOPermission.check
	at com/ms/security/PolicyEngine.deepCheck
	at com/ms/security/PolicyEngine.checkPermission
	at com/ms/security/StandardSecurityManager.chk
	at com/ms/security/StandardSecurityManager.checkRead
	at java/io/File.exists
	at CheckFileSize.setFile

	public String setFile(String filePath)
	{
		try
		{	Class.forName("com.ms.security.PolicyEngine"); // throws ClassNotFoundException
			PolicyEngine.assertPermission(PermissionID.FILEIO);
		}
		catch (ClassNotFoundException cnfe)
		{   
			   // ignore
		}
		catch (Exception x)
		{   x.printStackTrace ();
		}
		catch (Error e)
		{   e.printStackTrace ();
		}
		
		this.f = new File(filePath);

		if (!f.exists())
		{
			errMsg = "File \"" + f.getName() + "\" does not exist";
			repaint();
			return errMsg;
		}

		else if (!f.canRead())
		{
			errMsg = "Problems appeared reading the file";
			repaint();
			return errMsg;

		}

		try
		{
			setImageInfo(new FileInputStream(f));
		}
		catch (FileNotFoundException e)
		{
			errMsg = "File \"" + f.getName() + "\"not Found";
			repaint();
			return errMsg;
		}

		return "file \"" + f.getName() + "\" loaded successfully";
	}

 

[egm2005]

That is because Applets are not allowed to. The client must relax security in order to make this work.

 

[egm2005]

Also,

You can youe Keygen to generate a trusted applet.

Ed

 

[sedj]

egm2005 :

If you read the original post, they say the applet is actually signed, so this is probably not the problem.

BayK :

I notice your stack trace indicates that you are using the MSJVM. You should be aware that this product is now discontinued (due to legal wranglings between Sun and M$), and you/your clients should move to the Sun JVM plugin, available from

http://www.java.com

.

I'm not saying this is the problem, but I would certainly uninstall the MSJVM, install the Sun JVM and then see if you still have problems. A signed applet should be able to operate out of the 'sandbox' restrictions, and access the client filesystem.

Links for help on the MSJVM discontinuation :

http://support.microsoft.com/default.aspx?scid=fh;[LN];LifeAn12

http://www.scaonline.ca/2004Newsletters/Spring/microsoft.htm

Good Luck !


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