How can I share cache files between users in a sandboxed Mac app?

Our app downloads media files and stores them for use later. The size can be up to a few GB so it's considerable. Because this can be so large I want the cache to be shared across different users. My understanding of sandboxing is that you cannot write outside of the ~/Library/Containers/<your app id>... directory, thus there will be one copy per user.
I get an access denied error when trying these folders (not surprising but I tried it anyway):
/Users/Shared/...
/Library/Application Support/...
Does anybody know of a way I can have a sandboxed application with some kind of user agnostic cache storage?

It's not worth the trouble. There are very few multi-user Macs out there. The only way to accomplish this in the sandbox would be a shared cache location that a sure would setup in preferences and store with a security-scoped bookmark. Each user would have to set the same option to use the shared cache location.

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The second is a bit trickier.

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Read "iTunes: Setting up Home Sharing on your computer."

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cm

One of you will have to buy the book first (and put on reader, I assume). According to what Kobo Customer Care told me, with Adobe Digital Editions open that person then goes on the site the book was bought from, signs in, goes on purchase history and clicks on the book. Hit Download epub or pdf, choose Open for Windows or Save for Mac, Adobe will show the book. make sure you are in library view, plug the reader in and authorize the device. Drag and drop the book into the reader icon that shows up under the Bookshelf items. It should copy the file. When done, eject using the safely remove mass storage device option. After unplugging, it will process the new content. I haven't done it yet, I just received the instructions.

How can I share Pin variable between two packages?

Hi every one,
Is there any one who knows how can I share Pin variable that it is defined with OwnerPin between two packages in java card( with eclipse 3.1),I studied Sharing Interface subject and I knows it teorical but I can not do it practical .
I can share primitive data type but I can not share Ownerpin.
If anybody has some sample codes or knows any link ,please inform me.
My code is same as below:
//In Server Side
package ginaPack;
import javacard.framework.*;
public class GinaApplet extends Applet implements GinaInterface{
OwnerPIN pin;
private GinaApplet (byte[] bArray,short bOffset,byte bLength) {
    pin =new OwnerPIN(PIN_TRY_LIMIT,MAX_PIN_SIZE);
          byte PinTemp[] = new byte[4];
          PinTemp[0] = (byte) 0x31;
          PinTemp[1] = (byte) 0x31;
          PinTemp[2] = (byte) 0x31;
          PinTemp[3] = (byte) 0x31;
          pin.update(PinTemp, (short) (0), (byte) PinTemp.length);
    public Shareable getShareableInterfaceObject(AID clientAID,byte parameter)
          return this;
    public OwnerPIN getPinShareable()
         return pin;
     public void process(APDU apdu)
                  //there are some codes in this here
}//Interface in Server side
public interface GinaInterface extends Shareable
      public OwnerPIN getPinShareable();
}//In Client side
import ginaPack.*;
public class UserCardApplet extends Applet {
private UserCardApplet(byte[] bArray, short bOffset, byte bLength) {
     //there are some codes in this here
public boolean select() {
          final byte[] Gina_AID={(byte)0x47,(byte)0x69,(byte)0x6e,(byte)0x61,(byte)0x41,(byte)0x70,(byte)0x70,(byte)0x6c,(byte)0x65,(byte)0x74};
          AID GinaAID = JCSystem.lookupAID( Gina_AID, ( short )0,( byte )Gina_AID.length );
          if ( GinaAID == null ) // probably not loaded on card
                    ISOException.throwIt( ISO7816.SW_FUNC_NOT_SUPPORTED );//6a 80
          GinaInterface ff = (GinaInterface) JCSystem.getAppletShareableInterfaceObject(GinaAID,(byte)0);
          if( ff == null )
               ISOException.throwIt((short)0x0903);
if ( ff.getPinShareable().getTriesRemaining()== 0 ) return false;
}My problem is in this line :
"if ( ff.getPinShareable().getTriesRemaining()== 0 ) return false; "when I select my applet this line throw an exception, ff.getPinshareable includes all of OwnerPin methods(such as getTriesRemaining ,check ,reset, update ,...)but all of them throw exception .
I think firewal does not allow other packages uses this methods .If my guess is right then what should I do for sharing the variables that they are defined with non primitive data type such as (OwnerPin,Signature,...)
I'd appriciated for any help.
yours sincerely,
Orchid.
Message was edited by:
NewOrchid

Applet 1:
package com.package1;
import javacard.framework.*;
public class Applet1 extends Applet {
    private static final byte tryLimit = (byte)3;
    private static byte[] pinBytes = {(byte)1, (byte)7, (byte)4, (byte)5, (byte)2};
    private Library1 lib;
    protected Applet1(byte bArray[], short bOffset, byte bLength) throws PINException {
        lib= new Library1(tryLimit, (byte)pinBytes.length);
        lib.update(pinBytes, (short)0, (byte)pinBytes.length);
        register();
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new Applet1(bArray, bOffset, bLength);
    public void process(APDU apdu) {
        byte status=(byte)0;
        lib.resetAndUnblock();
        if (!(lib instanceof Shareable)) status += (byte)2;
        if (!(lib instanceof MyPIN)) status += (byte)4;
        ISOException.throwIt(Util.makeShort((byte)0x90, status)); // sw indicates tries remaining
    public Shareable getShareableInterfaceObject(AID cltAID, byte parm) {
        return lib;
}Library1:
package com.package1;
import javacard.framework.OwnerPIN;
import javacard.framework.PINException;
public class Library1 extends OwnerPIN implements Interface1{
    public Library1(byte tryLimit, byte maxPINSize) throws PINException {
        super(tryLimit, maxPINSize);
}Interface1:
package com.package1;
import javacard.framework.PIN;
import javacard.framework.Shareable;
public interface Interface1 extends Shareable {
    boolean check(byte[] pin, short offset, byte length);
    byte getTriesRemaining();
    boolean isValidated();
    void reset();
}Applet2:
package com.package2;
import javacard.framework.*;
import com.package1;
public class Applet2 extends Applet {
    private final static byte CLA_TEST = (byte)0x80;
    private final static byte INS_TEST = (byte)0x20;
    private final static byte P1_AUTHORIZE = (byte)0x00;
    private final static byte P1_DOIT = (byte)0x01;
    private final static byte P1_CHECK_SIO = (byte)0x0a;
    private Interface1 sio;
    protected Applet2(byte bArray[], short bOffset, byte bLength) {
        register();
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new Applet2(bArray, bOffset, bLength);
    public void process(APDU apdu) {
     byte[] buffer = apdu.getBuffer();
        if ((buffer[ISO7816.OFFSET_CLA] == CLA_TEST) ||
            (buffer[ISO7816.OFFSET_CLA] == ISO7816.CLA_ISO7816)) {
            short bytesReceived = apdu.setIncomingAndReceive();
            switch (buffer[ISO7816.OFFSET_INS]) {
            case ISO7816.INS_SELECT:
                if (!JCSystem.getAID().equals(buffer, ISO7816.OFFSET_CDATA, buffer[ISO7816.OFFSET_LC]))
                    ISOException.throwIt(ISO7816.SW_APPLET_SELECT_FAILED);
                sio = (Library1)JCSystem.getAppletShareableInterfaceObject(JCSystem.lookupAID(<fill in parameters>);
                if (sio == null)
                    ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
                break;
            case INS_TEST:
                switch (buffer[ISO7816.OFFSET_P1]) {
                case P1_AUTHORIZE:
                    if (!sio.isValidated()) {
                        if(!sio.check(buffer, ISO7816.OFFSET_CDATA, buffer[ISO7816.OFFSET_LC]))
                            ISOException.throwIt(Util.makeShort((byte)0x9A, sio.getTriesRemaining()));
                    break;
                case P1_DOIT:
                    if (!sio.isValidated())
                        ISOException.throwIt(ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
                    sio.reset();
                    ISOException.throwIt(Util.makeShort((byte)0x9A, sio.getTriesRemaining()));
                    break;
                default:
                    ISOException.throwIt(ISO7816.SW_INCORRECT_P1P2);
                break;
            default:
                ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
        else {
            ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
}1. Upload package1
2. Install Applet1
3. Select Applet1
4. Upload package2
5. Install Applet2
6. Select Applet2

How can I share documents with other users from iWork?

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Dropbox works pretty well for sharing.
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Also, File Sharing with iTunes is a great way to move the files back and forth.
iOS: About File Sharing - Support - Apple
Message was edited by: Demo

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Mac_Journal wrote:
A different question then: Can I create a functioning wifi network from my Mac?
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I have an iMac with 2 user accounts and I want to share a folder between them. I have gone on to system preferences>sharing and turned on file sharing. I have also got the 'Get Info' thing up, selected 'Shared Folder' and added the other user to the read and write permissions...it just doesn't show up on the other desktop (the folder is on my desktop, I would have expected to see it on the other desktop...?)
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jrwood116 wrote:
Thanks, but do you have to do that every time you share a folder?
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jrwood116 wrote:
I've read numerous 'how to share a folder' blogs and they just say it's as simple as clicking 'share' and allowing specific users to access it...none have mentioned this (not saying your advice is wrong at all, just don't get why no-one else has mentioned what appears to be a key step!)
Can you give me an example of such a blog. I suspect you may have mis-understood what they were saying but if you can provide a link, I'll look at it.

How can I share a folder between two users on the same mac?

Hi all,
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Is there not a way, using the the folders shared permissions, to allow shared folders from one user to be visible and usable by another user on the same mac without having to move the folder to a designated shared location?
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jrwood116 wrote:
Thanks, but do you have to do that every time you share a folder?
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jrwood116 wrote:
I've read numerous 'how to share a folder' blogs and they just say it's as simple as clicking 'share' and allowing specific users to access it...none have mentioned this (not saying your advice is wrong at all, just don't get why no-one else has mentioned what appears to be a key step!)
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Hi, i'm creating an account on my Mac for my niece who has just got her own iPhone.
It will be registered to her iCloud account with her own photos, Mail, Mac & iOS apps, files, etc. But I have a large music library that I want to share with her.
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Thanks!
P.S. I'm running OSX Mavericks but will soon be updating to Yosemite once available.

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Home Sharing Support page - http://www.apple.com/support/homesharing/
iTunes: Setting up Home Sharing on your computer - http://support.apple.com/kb/HT4620
Understanding Home Sharing - http://support.apple.com/kb/HT3819
iOS8 preview - http://www.apple.com/ios/ios8/family-sharing/ -family sharing
iTunes Home Sharing now works between users on same computer - https://discussions.apple.com/thread/3865597
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How can I share cache files between users in a sandboxed Mac app?

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