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Jun 01 Mac OS X

Volume Number: 17 (2001)
Issue Number: 06
Column Tag: Mac OS X

File Formats and Legacy Object Unarchiving

by Andrew Stone

An Object Lesson for Programmers

Most programs write data files. This is an article about how we used to write objects, some of the trouble we got into later, how I got out of that trouble, and a description of how to write a file with a format that will endure almost forever, be forward and backwardly compatible, and be universally parseable.

A long time ago in a place not too far away, disk space was a very precious commodity - witness my first mass storage purchase in 1986: a 10 Megabyte external SCSI hard drive for my Mac+. The cost was $600. Now you can get a 30 gig drive for around $130, three thousand times the amount of storage for a quarter of the cost. Back in those early dark days, compressed, machine-only readable binary streams made sense. And if space is still an issue because of scale, binary streams are still useful. But when it comes to life cycles of software and maximal interoperability between applications, a plain English table of keys and values that humans can read (such as XML) is a compelling archival format because documents are backwardly and forwardly compatible. What this means is that earlier versions of your program can open documents produced by later versions, although some information may be lost.

Moreover, you do not force your users into unacceptable proprietary data formats. Instead, Cocoa developers should support writing their objects in XML as a combination of dictionaries, arrays, strings, values and data. Data is the catch all for objects which cannot decompose into the simpler types or are best represented as an object stream, such as an NSColor or an NSTextStorage. The CoreFoundation classes which serve both Carbon and Cocoa can write standard objects as either UTF8 XML or as an even easier-to-read format, the old style NeXTStep property list:

{
    BitDepth = 520; 
    DocumentHTML = {
        BGColor = <040b7479 70656473 74726561 6d8103e8 84014084 8484074e 53436f6c 6f720084 84084e53 
        4f626a65    63740085 84016301 84046666 6666833f 4ccccd83 3f4ccccd   010186>; 
        
        CenterInTable = YES; 
        Coalesce = 0; 
        ColorFromView = NO; 
        HTMLClass = DocumentHTML; 

Now, compare that readability and compactness to the XML version:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist SYSTEM 
"file://localhost/System/Library/DTDs/PropertyList.dtd">
<plist version="0.9">
<dict>
   <key>BitDepth</key>
   <string>520</string>
   <dictionary>
      <key>BGColor</key>
      <data>

BAt0eXBlZHN0cmVhbYED6IQBQISEhAdOU0NvbG9yAISECE5TT2JqZWN0AIWEAWMDhAJm
      ZgEBhg==
      </data>
      <key>CenterInTable</key>
      <string>YES</string>
      <key>Coalesce</key>
      <integer>0</integer>
      <key>ColorFromView</key>
      <string>NO</string>
      <key>HTMLClass</key>
      <string>DocumentHTML</string>

XML adds the ability to write dates and number values to the standard set of dictionary, array, string and data. /Developer/Documentation/ReleaseNotes/Foundation.html explains this and other nuances about writing XML. Currently, we prefer the old style property list for cross-platform compatibility with OpenStep and Mac OS X Server versions of our applications.

Opening the Vault

The reason I know that property lists is the way to archive data is the amount of work I have had to do to convert old NeXTStep 3 object streams into something openable by Create® for OS X. For almost all AppKit classes, the ability to open their original NeXTStep counterpart class is already provided by Apple. For example, an NSColor can open an NXColor struct, and NSPrintInfo can open archived PrintInfo objects. Where this all falls down is in View: NSView cannot open View objects because the Objective-C List object does not have an -initWithCoder: and subviews were stored in a list. This can be verified by reviewing the Darwin source code. This affected NeXTStep applications such as Create, NeXTStep Draw, and other applications which stored the data model in a binary typed stream as a list of graphics owned by GraphicView, a subclass of View:

__typedstreamÅ_¢Ñ_i_Ñ_@ÑÑÑ   PrintInfo
Black_WeaverÑÑ_NeXT 400 dpi Level II PrinterÑÑ_goat

In hindsight, this is a stupid architectural decision - you shouldn't comingle data that forms the content of your document with the way you display that data. And, if you are an object purist such as this wizened old timer, you are not content until the view, the model and the controller components are all neatly separated. Luckily, if you use Cocoa's NSDocument architecture, you will automatically do the right thing!

The File Upgrader

Create has a separate, included application named "CreateDocUpgrader.app". By adding a Copy Files... phase to your Project Builder project, you can include other builds and products in your main application, such as the CreateDocUpgrader.app. Create registers for the old NeXTStep Create's file extension, ".create" in Project Builder:

1. Click "Targets"
2. Select your application
3. Click on the "Applications Settings" in the Target inspector pane
4. Click on your document type
5. Add the new extension to be opened in the Extensions field, separated by spaces


Figure 1. Just add the file extensions of the legacy files to be opened.

When a file is double-clicked, Finder will ask your app to open it. Your NSApplication's delegate class implements the following method to call on the included upgrader application:

- (BOOL)application:(NSApplication *)sender openFile:(NSString *)path
{
    NSString *ext = [path pathExtension];
    if ([ext isEqual:@"create"]) {
        NSString *upgrader = [[NSBundle mainBundle] pathForResource:@"CreateDocUpgrader" ofType:@"app"];
        if (upgrader) {
            return [[NSWorkspace sharedWorkspace] openFile:path withApplication:upgrader];
        } else NSRunAlertPanel(UPGRADER_TITLE,UPGRADER_MSG,OK,NULL,NULL);
    } else ...

The Upgrader is launched and asked to open the legacy file. In the Upgrader's NSApplication's delegate, you implement:

- (BOOL)application:(NSApplication *)sender openFile:(NSString *)path
{
    return [self openLegacyFileAndAutoSave:path];
}

We want to convert the file and then open it with Create when it completes:

- (BOOL)openLegacyFileAndAutoSave:(NSString *)file;
{
    // get a new, unique file name based on the original name:
    NSString *newName = [self newFileNameWithPath:file];
    if ( [[self documentFromFile:file] saveFileToPath:newName] ) {
      return [[NSWorkspace sharedWorkspace] openFile:newName withApplication:@"Create"];
    } 
    NSRunAlertPanel(OPEN, CANNOT_OPEN_MSG, OK, NULL,NULL,file,newName);
    return NO;
}

So, the real guts of the upgrader is the ability to read a typed stream by implementing initWithCoder: in all classes contained in the typed stream, and then to have those objects create an English property list representation, that is, the property list format that Create now uses. For the most part, you map the old classes to the new NS* classes by invoking a little rewiring magic in NSUnarchiver. Early in the launch cycle (applicationWillFinishLaunching: for example), include code like this:

    [NSUnarchiver decodeClassName:@"PrintInfo" asClassName:@"NSPrintInfo"];

So, when the unarchiver hits the class named "PrintInfo" in the object "typed stream", it will instantiate an NSPrintInfo object, which knows how to open the older versions of this object in its -initWithCoder:(NSUnarchiver *)unarchiver method. For Create documents, we rewired the following:

- (void)applicationWillFinishLaunching:(NSNotification *)notification {
    // Some classes just work by remapping:
    [NSUnarchiver decodeClassName:@"PrintInfo" asClassName:@"NSPrintInfo"];
    
    // we need to be able to unarchive NSImage's - and they just work as well!
    [NSUnarchiver decodeClassName:@"NXImage" asClassName:@"NSImage"];
    [NSUnarchiver decodeClassName:@"NXImageRep" asClassName:@"NSImageRep"];
    [NSUnarchiver decodeClassName:@"NXBitmapImageRep" asClassName:@"NSBitmapImageRep"];
    [NSUnarchiver decodeClassName:@"NXCachedImageRep" asClassName:@"NSCachedImageRep"];
    [NSUnarchiver decodeClassName:@"NXEPSImageRep" asClassName:@"NSEPSImageRep"];
    
    // we need our own List reader:
    [NSUnarchiver decodeClassName:@"List" asClassName:@"MyList"];    

    // the classes NOT openable by Darwin/OS X:
    // we'll write our own versions:
    [NSUnarchiver decodeClassName:@"View" asClassName:@"MyView"];
    [NSUnarchiver decodeClassName:@"Window" asClassName:@"MyWindow"];
    [NSUnarchiver decodeClassName:@"Responder" asClassName:@"MyResponder"];
    
    // Some private class we have to be able to read:
    [NSUnarchiver decodeClassName:@"PSMatrix" asClassName:@"MyPSMatrix"];

}

Through trial and error handling, I figured out what View and Window were trying to read. When the Unarchiver reads through the stream, it checks to see what the next type archived is. If that is different from what you are trying to read, an exception is thrown with a message that explains what it expected versus what you attempted to read. I usually put a breakpoint in NSException's raise, so I can quickly backtrace to the line of code which caused the exception. To set this breakpoint in PBX's debugger, pause the execution of the program, and enter:

br -[NSException raise]

Because we don't really need an NSView or NSWindow, simply the list of graphics stored by the View subclass, we are only trying to read through the stream, keeping in synch with the objects therein, so we can get to our data model contained by the view. Here are minimal versions of the classes you will need to read old NeXTStep object streams:

@interface MyList : List
@end

@implementation MyList

- (id)initWithCoder:(NSCoder *)aDecoder
{
    int version = [aDecoder versionForClassName:@"List"]; 
    NSZone *zone = [self zone];

    NS_DURING
    if (version == 0) {
         [aDecoder decodeValueOfObjCType:"i"  at:&maxElements];
         [aDecoder decodeValueOfObjCType:"i"  at:&numElements];

        dataPtr = (id *) NSZoneMalloc (zone, numElements*sizeof(id));
   [aDecoder decodeArrayOfObjCType:"@" count:numElements at:dataPtr];
    } else {
        [aDecoder decodeValueOfObjCType:"i" at:&numElements];
        maxElements = numElements;
        if (numElements) {
            dataPtr = (id *) NSZoneMalloc (zone, numElements*sizeof(id));
            [aDecoder decodeArrayOfObjCType:"@"  count:numElements at:dataPtr];
       }
    }
   
    NS_HANDLER
        NSLog(@"threw exception reading List: %@ : %@",[localException name], [localException reason]);
    NS_ENDHANDLER
    return self;
}
@end

@interface MyResponder : Object
{
    id                  nextResponder;
    id                  _reserved;
}
- (id)initWithCoder:(NSCoder *)coder;
@end

@implementation MyResponder 

- (id)initWithCoder:(NSCoder *)aDecoder {
    nextResponder = [aDecoder decodeObject];
    return self;
}

@end 


@implementation MyView
// we do use the frame and bounds:
- (NSRect)frame { return frame; }
- (NSRect)bounds { return bounds; }

- (id)initWithCoder:(NSCoder *)aDecoder
{
    float             f;
    unsigned int version = [aDecoder versionForClassName:@"View"]; 

    NS_DURING

    [super initWithCoder:aDecoder];
    [aDecoder decodeValueOfObjCType:"f" at:&f];
    frame = [aDecoder decodeRect];
    bounds = [aDecoder decodeRect];
    
    superview = [aDecoder decodeObject];
     window = [aDecoder decodeObject];

    [aDecoder decodeValuesOfObjCTypes:"@ss@", &subviews, &vFlags, &_vFlags, &_drawMatrix];

    NS_HANDLER
        NSLog(@"threw exception reading View: %@ : %@",[localException name], [localException reason]);
    NS_ENDHANDLER
    return self;
}

@end


@interface MyWindow : MyResponder
{
    NSRect              frame;
    id                  contentView;
    id                  delegate;
    id                  firstResponder;
    id                  lastLeftHit;
    id                  lastRightHit;
    id                  counterpart;
    id                  fieldEditor;
    int                 winEventMask;
    int                 windowNum;
    float               backgroundGray;
    struct _wFlags {
#ifdef __BIG_ENDIAN__
   unsigned int        style:4;
   unsigned int        backing:2;
   unsigned int        buttonMask:3;
   unsigned int        visible:1;
   unsigned int        isMainWindow:1;
   unsigned int        isKeyWindow:1;
   unsigned int        isPanel:1;
   unsigned int        hideOnDeactivate:1;
   unsigned int        dontFreeWhenClosed:1;
   unsigned int        oneShot:1;
#else
   unsigned int        oneShot:1;
   unsigned int        dontFreeWhenClosed:1;
   unsigned int        hideOnDeactivate:1;
   unsigned int        isPanel:1;
   unsigned int        isKeyWindow:1;
   unsigned int        isMainWindow:1;
   unsigned int        visible:1;
   unsigned int        buttonMask:3;
   unsigned int        backing:2;
   unsigned int        style:4;
#endif
    }                   wFlags;
    struct _wFlags2 {
#ifdef __BIG_ENDIAN__
   unsigned int        deferred:1;
   unsigned int        _cursorRectsDisabled:1;
   unsigned int        _haveFreeCursorRects:1;
   unsigned int        _validCursorRects:1;
   unsigned int        docEdited:1;
   unsigned int        dynamicDepthLimit:1;
   unsigned int        _worksWhenModal:1;
   unsigned int        _limitedBecomeKey:1;
   unsigned int        _needsFlush:1;
   unsigned int        _newMiniIcon:1;
   unsigned int        _ignoredFirstMouse:1;
   unsigned int        _repostedFirstMouse:1;
   unsigned int        _windowDying:1;
   unsigned int        _tempHidden:1;
   unsigned int        _hiddenOnDeactivate:1;
   unsigned int        _floatingPanel:1;
#else
   unsigned int        _floatingPanel:1;
   unsigned int        _hiddenOnDeactivate:1;
   unsigned int        _tempHidden:1;
   unsigned int        _windowDying:1;
   unsigned int        _repostedFirstMouse:1;
   unsigned int        _ignoredFirstMouse:1;
   unsigned int        _RESERVED:1;
   unsigned int        _needsFlush:1;
   unsigned int        _limitedBecomeKey:1;
   unsigned int        _worksWhenModal:1;
   unsigned int        dynamicDepthLimit:1;
   unsigned int        docEdited:1;
   unsigned int        _validCursorRects:1;
   unsigned int        _haveFreeCursorRects:1;
   unsigned int        _cursorRectsDisabled:1;
   unsigned int        deferred:1;
#endif
    }                   wFlags2;
    id                  _borderView;
    short               _displayDisabled;
    short               _flushDisabled;
    void               *_cursorRects;
    id              _trectTable;
    id                  _invalidCursorView;
    id         _miniIcon;
    void        *private;
}
@end

@implementation MyWindow

- (id)initWithCoder:(NSCoder *)aDecoder
{
    unsigned int version = [aDecoder versionForClassName:@"Window"]; 
    NSRect              frameRect;
    char               *title;
    NSZone    *zone = [self zone];
    short    flags;
    
    NS_DURING

    [super initWithCoder:aDecoder];

   frame = [aDecoder decodeRect];
   
    if (version == 0) {
        [aDecoder decodeValuesOfObjCTypes:"@@ifss*", &contentView, &counterpart, &winEventMask, 
        &backgroundGray, &wFlags, &wFlags2, &title];
        
    } else if (version == 1) {
        [aDecoder decodeValuesOfObjCTypes:"@@ifss**", &contentView, &counterpart, &winEventMask, 
        &backgroundGray, &wFlags, &wFlags2, &title,&_miniIcon];

    } else if (version >= 2) {
   NSColor *tmpColor;
        [aDecoder decodeValuesOfObjCTypes:((version >= 4) ? "@@ifss*@s" : "@@ifss**s"), &contentView, 
        &counterpart,   &winEventMask, &backgroundGray, &wFlags, &wFlags2, &title, &_miniIcon, &flags];
        tmpColor = [aDecoder decodeNXColor];
    }
    if (version >= 3) {
   NSSize min, max;
   char c;
   [aDecoder decodeValueOfObjCType:"c" at:&c];
   if (c & 1) min = [aDecoder decodeSize];
   if (c & 2) max = [aDecoder decodeSize];
    }
    delegate = [aDecoder decodeObject];
    firstResponder = [aDecoder decodeObject]; 
    frameRect = frame;
    frameRect.origin.x = frameRect.origin.y = 0.0;

    NS_HANDLER
        NSLog(@"threw exception reading Window: %@ : %@",[localException name], [localException reason]);
    NS_ENDHANDLER
    return self;
}

@end

// this is two matrices - probably for view rotation - but our view cannot be rotated, so we read and 
go on...

@interface MyPSMatrix: Object
{
    float matrixElements[12];   
    unsigned short flags;
}

@implementation MyPSMatrix
- (id)initWithCoder:(NSCoder *)aDecoder
{
    float f;
    unsigned int version = [aDecoder systemVersion]; 

    NS_DURING
    
    if (version < 901) {
   int temp;
   [aDecoder decodeArrayOfObjCType:"f" count:12 at:&matrixElements];
   [aDecoder decodeValueOfObjCType:"i" at:&temp];
    } else {
   [aDecoder decodeArrayOfObjCType:"f" count:12 at:&matrixElements];
   [aDecoder decodeValueOfObjCType:"s" at:&flags];
  }

    NS_HANDLER
        NSLog(@"threw exception reading PSMatrix: %@ : %@",[localException name], 
        [localException reason]);
    NS_ENDHANDLER
    return self;
}

@end

So, the preceding code lets you get at your own objects, but consider the case where you have legacy files from OpenStep as well as NeXTStep. In OpenStep, we use the NSView hierarchy, so if you have custom class which can open both NeXTStep and OpenStep typed streams, then you'll have conditional code at the top of the -initWithCoder:

GraphicView:NSView

- (id)initWithCoder:(NSCoder *)aDecoder
{
    int version = [aDecoder versionForClassName:@"GraphicView"];

    if (version < 400) {   // NeXTSTEP...
 // we don't really use too much of what's in a view
 // An NSView cannot open us up - therefore, we'll use our custom MyView to imitate:
        id oldStyleView = [[MyView alloc]init];
        NSLog(@"attempting to read NeXTSTEP object file");
        [oldStyleView initWithCoder:aDecoder];
        // we'll grab two ivars we care about:
        _frame = [oldStyleView frame];
        _bounds = [oldStyleView bounds];
      // if you needed more info from the View, just implement more methods in       
      // MyView, and query here...
      
    } else [super initWithCoder:aDecoder];      // An OpenStep object file
    .....
    // now, the normal unarchiving follows, which includes reading the list of graphics
    ....

Now, the GraphicView stored a list of graphics - so we want to be able to convert the old List object into a new NSMutableArray. That trick is achieved by this invoking line and NSMutableArray category method initFromList:

    _graphics = [[NSMutableArray allocWithZone:[self zone]] initFromList:_graphics];

@interface NSMutableArray(Compatibility)
- (id)initFromList:(id)aList;
@end

 @implementation NSMutableArray(Compatibility)

- (id)initFromList:(id)aList
{
    int i, count;

    if ([aList respondsToSelector:@selector(isKindOf:)] && [aList isKindOf:[List class]] )  {
        count = [aList count];
        [self initWithCapacity:count];
        for (i = 0; i < count; i++) {
            [self addObject:[aList objectAt:i]];
        }
    } else if ([aList isKindOfClass:[NSArray class]]) {
        return [self initWithArray:aList];
    } else {
        /* should probably raise */
    }

    return self;
}

@end

Writing the Property List

So, with this code, you should be able to unarchive NeXTStep data models that included List, View, Responder, and Window classes. The one ‘caveat emptor' is that NXDataLink, and family classes, do not really have a corresponding class in the AppKit, so if your application allowed automatically updating embedded links, you are going to have to do more reverse engineering! Meanwhile, this whole mess could have been avoided by storing your data as a dictionary, with keys and values for each instance variable. An excellent example of the use of property lists as an archive format is provided in the OS X Developer release in Sketch: /Developer/Examples/AppKit/Sketch.

Once you have the legacy objects read into memory, then you write them out in the property list format:

static NSString *SKTGraphicsListKey = @"GraphicsList";
static NSString *SKTDrawDocumentVersionKey = @"DrawDocumentVersion";
static int SKTCurrentDrawDocumentVersion = 1;
static NSString *SKTPrintInfoKey = @"PrintInfo";

- (NSDictionary *)drawDocumentDictionaryForGraphics:(NSArray *)graphics {
    NSMutableDictionary *doc = [NSMutableDictionary dictionary];
    unsigned i, c = [graphics count];
    NSMutableArray *graphicDicts = [NSMutableArray arrayWithCapacity:c];

    for (i=0; i<c; i++) {
        [graphicDicts addObject:[[graphics objectAtIndex:i] propertyListRepresentation]];
    }
    [doc setObject:graphicDicts forKey:SKTGraphicsListKey];
    [doc setObject:[NSString stringWithFormat:@"%d", SKTCurrentDrawDocumentVersion] 
       forKey:SKTDrawDocumentVersionKey];
    [doc setObject:[NSArchiver  archivedDataWithRootObject:[self printInfo]] forKey:SKTPrintInfoKey];

    return doc;
}

To write it out as ASCII, get the dictionary and return the NSData:

- (NSData *)drawDocumentDataForGraphics:(NSArray *)graphics {
    NSDictionary *doc = [self drawDocumentDictionaryForGraphics:graphics];
    NSString *string = [doc description];
    return [string dataUsingEncoding:NSASCIIStringEncoding];
}

To save the actual file, simply override -dataRepresentationOfType:

- (NSData *)dataRepresentationOfType:(NSString *)type {
    if ([type isEqualToString:SKTDrawDocumentType]) {
        return [self drawDocumentDataForGraphics:[self graphics]];
    } else....
}

Finally, each Graphic subclass needs to know how to respond to propertyListRepresentation - here's an example:

NSString *SKTImageContentsKey = @"Image";
NSString *SKTFlippedHorizontallyKey = @"FlippedHorizontally";
NSString *SKTFlippedVerticallyKey = @"FlippedVertically";

- (NSMutableDictionary *)propertyListRepresentation {
    NSMutableDictionary *dict = [super propertyListRepresentation];
    [dict setObject:[NSArchiver archivedDataWithRootObject:[self image]] forKey:SKTImageContentsKey];
    [dict setObject:([self flippedHorizontally] ? @"YES" : @"NO") forKey:SKTFlippedHorizontallyKey];
    [dict setObject:([self flippedVertically] ? @"YES" : @"NO") forKey:SKTFlippedVerticallyKey];
    return dict;
}

Because each Graphic subclass encodes its name under the key SKTClassKey, Graphic uses code like this to instantiate the correct class:

+ (id)graphicWithPropertyListRepresentation:(NSDictionary *)dict {
    Class theClass = NSClassFromString([dict objectForKey:SKTClassKey]);
    id theGraphic = nil;
    
    if (theClass) {
        theGraphic = [[[theClass allocWithZone:NULL] init] autorelease];
        if (theGraphic) {
            // read all the values stored and reconstitute:
            [theGraphic loadPropertyListRepresentation:dict];
        }
    }
    return theGraphic;
}

Again, refer to the Sketch source code for a full implementation of reading and writing property lists.

Conclusion

The end result of using property lists as a file format is that humans can read them, edit them at will, and open them with other applications including earlier versions of the creating application. The advantages of property lists very much outweigh the only disadvantage which is file size: about twice that of a binary equivalent.


Andrew Stone, CEO of Stone Design Corp - www.stone.com, has twice the number of ZPG children and farms chiles and software from a tower along the Rio Grande in Albuquerque New Mexico.

 

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Mac Pros on sale for up to $260 off MSRP
B&H Photo has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3719.99... Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
iMacs on sale for up to $205 off MSRP, NY tax...
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $999 $100 off - 21″ 2.7GHz iMac: $1189 $110 off - 21″ 2.9GHz... Read more
12-inch 1.1GHz Silver MacBook in stock today
B&H Photo has the new 12″ 1.1GHz Silver MacBook in stock today for $1299 including free shipping plus NY sales tax only. Act now if you’re interested, since we don’t expect B&H to have this... Read more
iPad Air 2s on sale for up to $50 off, NY tax...
B&H Photo has iPad Air 2s on sale for up to $64 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
Check Apple prices on any device with the iTr...
MacPrices is proud to offer readers a free iOS app (iPhones, iPads, & iPod touch) and Android app (Google Play and Amazon App Store) called iTracx, which allows you to glance at today’s lowest... Read more
Sale! New 13-inch 256GB MacBook Air for $1099...
B&H Photo has the new 2015 13″ 1.6GHz/256GB MacBook Air on sale for $1099.99 including free shipping plus NY tax only. Their price is $100 off MSRP. Read more
Japan Post Group, IBM and Apple Deliver iPads...
Japan Post Group, IBM and Apple executives meeting in in New York City yesterday announced a first-of-its-kind initiative aimed at improving the quality of life for millions of Japanese senior... Read more
Worldwide Tablet Market Contracts For Second...
Worldwide tablet shipments recorded a second consecutive quarter of year-over-year decline in the first calendar quarter of 2015 (1Q15), according to preliminary data from the International Data... Read more
Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more

Jobs Board

Senior Identity Architect - *Apple* Pay - A...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Hardware Systems Integration Engineer - *App...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Senior Identity Architect - *Apple* Pay - A...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Hardware Systems Integration Engineer - *App...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
Senior Identity Architect - *Apple* Pay - A...
Changing the world is all in a day039s work at Apple . If you love innovation, here039s your chance to make a career of it. You039ll work hard. But the job comes with Read more
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