TweetFollow Us on Twitter

Modern DebugStr
Volume Number:12
Issue Number:9
Column Tag:Debugging Aids

DebugStr, the Modern Way

Capturing your program’s iostream of consciousness

By Jon Kalb

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

I have a friend who spends most of his time in cutting-edge (read, “reliable tools not yet available”) environments. He likes to say: “There is no debugger; there is only DebugStr.” While he may stretch the truth, he has a point. Our friends who build source-level debugging tools are a heroic lot, but there are times when MacsBug is the only option. This article, along with the accompanying dout Library, is one attempt to make using DebugStr a little more modern.

Using DebugStr is usually a clumsy process of converting integer values to strings and concatenating Pascal strings. There had to be a better way, I thought. That’s when it occurred to me to implement the low-level debugger as a C++ output stream.

The Solution Domain

This approach may be valuable for two groups: fellow users of DebugStr, and individuals interested in using and/or implementing C++ streams. But first, some limitations:

• I use the term “library” rather loosely. The dout Library is really just a small collection of source files. I also include project files for both Metrowerks and Symantec, to demonstrate how to use the library.

• In no way does this library replace a source-level debugger. If it is possible for you to use one, do so.

• Although, for the sake of clarity, I don’t follow this practice in this article, in real code your should always surround every use of the dout stream with some type of #ifndef NDEBUG statement. (NDEBUG is the preprocessor variable that controls the assert macro found in assert.h. Define NDEBUG for shipping code, and leave it undefined for code under development.) To make this task a little easier, the dout Library includes the data statement macro, ds. For example, the line “ds(dout << myObject);” would be completely stripped if NDEBUG was defined, and would become “dout << myObject;” if NDEBUG wasn’t defined.

• Streaming the semicolon character ';' to dout is problematic. MacsBug interprets the text following a semicolon as a MacsBug command, and attempts to execute text that you intended to display.

• Below are examples of overloading the insertion operator for objects to support debugging in a streams environment. This is possible if your code base doesn’t already use insertion operator overloading for other purposes. It may be possible to use the same routine for, say, storing an object to disk and for debugging purposes, but it seems unlikely. I suggest a work-around later.

• Streaming data to dout in the constructor of a static or global object (an object that is constructed before the first line of main is executed) is problematic. More on this below.

Using the Library

To use the dout Library you must include the standard C++ iostreams and the source file debugbuf.cp. Each source file that writes to the dout stream must include the header file doutstream.

Standard Streams

You can use dout just as you would cout. For example:

#include "doutstream"
// ...
dout << "file corrupted at offset " << byteOffset << endl;
// ...
dout << "name: " << un << endl << "password: " << pw << endl;
// ...
dout << "completed pass " << i << " of " << total << endl;
// ...

You can use dout just like any standard C++ output stream, but, since the debugger is more than just a byte sink, we should be able to do more, and we can.

The dout Difference

The library defines a set of symbols that cause the stream to behave in interesting ways. Normally, the stream buffers characters until it fills a line (arbitrarily defined as 60 characters) or until the caller streams an endl. You can flush this buffer at any time by streaming an endl. (endl is the standard C++ streams manipulator function for advancing to the next line.) dout produces a blank line if there is currently no text in the stream’s buffer. To flush the buffer without creating blank lines, stream the constant doutsoftflush ('\r').

dout supports both horizontal and vertical tabs when streaming douttab ('\t') or doutverttab ('\v'). Streaming doutformfeed ('\f') flushes the buffer and inserts a line of underscores. Streaming doutbackspace ('\b') “eats” the last character in the buffer. Streaming doutsysbeep ('\a') calls SysBeep; however, just like other data, this is buffered. (To beep immediately, follow doutsysbeep with endl.)

Streaming data to dout doesn’t normally suspend your program the way that a call to DebugStr would. If you want to drop into the debugger, then stream either doutdebug ('\0') or doutdropin ('\0'). These are synonyms; either one will flush the buffer and leave you in the debugger with your application suspended. (Streaming the End-of-Text character ('\x03'), usually associated with the Enter key, will do the same thing.)

As a side-effect of using MacsBug for streaming output, we can execute MacsBug commands. If a semicolon appears in the data stream, MacsBug attempts to execute the text that follows as a MacsBug command. (This can produce unexpected results if the data you are streaming just happens to contain a semicolon.) Several commands can be executed in sequence as long as each command is preceded by a semicolon.

Although you can use the dout Library in conjunction with source-level debuggers (products from Jasik, Metrowerks and Symantec support capturing messages sent with DebugStr), only MacsBug is going to be able to interpret and execute MacsBug commands.

This is an example of using dout to execute MacsBug commands.

dout << doutcommand << "hc" << doutsoftflush;
// ...
dout << doutcommand << "dm #";
dout << (unsigned long)aPointer << endl;

Note the use of the constant doutcommand (';'), and that the stream buffer is flushed (with either endl or doutsoftflush) after each command. In this example, MacsBug executes the Heap Check command, and displays memory from the location pointed to by aPointer. The default behavior for commands is to execute the command and continue program execution. In the case of Heap Check, MacsBug suspends the execution of your program if the Heap Check finds that the heap is corrupted.

For my purposes this alone would justify using the library. The library handles conversion of integer values, there is no fooling with Pascal strings, and, the C++ implementation gives us type checking without worry. But, as they say on the infomercials: Wait, there’s more.

Extending Streams

Using C++ means that we also get extensibility.

I have included streamstructsmac.h and streamstructsmac.cp as an example of how to stream standard Macintosh types (or any structure). This is not an attempt to define insertion routines for all Macintosh Toolbox structures, only an example to show you how to declare and define insertion routines for structures that you may find useful.

Listing 1: streamstructmac.h

Declarations of Insertion Operators for Point, Rect, and BitMap

The following declarations allow Points, Rects, and BitMaps to be streamed out.

#include <iostream.h>
#include <QuickDraw.h>

// inserters

ostream &operator<<(ostream &stream, const Point &rhs);

ostream &operator<<(ostream &stream, const Rect &rhs);

ostream &operator<<(ostream &stream, const BitMap &rhs);

This is the standard way to implement insertion operator overloading to standard C++ library streams. Note that there is nothing specific to the dout Library in this set of declarations (or even in the implementation that follows). These same routines could be used to stream structures of these types to any C++ ostream.

Listing 2: streamstructmac.cp

Definitions of Insertion Operators for Point, Rect, and BitMap

The following definitions allow Points, Rects, and BitMaps to be streamed out.

#include "streamstructsmac.h"

// inserters

ostream &operator<<(ostream &stream, const Point &rhs)
{
 stream << ".v(" << rhs.v << ") ";
 stream << ".h(" << rhs.h << ") ";
 return stream;
}

ostream &operator<<(ostream &stream, const Rect &rhs)
{
 stream << ".t(" << rhs.top << ") ";
 stream << ".l(" << rhs.left<< ") ";
 stream << ".b(" << rhs.bottom<< ") ";
 stream << ".r(" << rhs.right << ") ";
 return stream;
}

ostream &operator<<(ostream &stream, const BitMap &rhs)
{
 stream << ".baseAddr(" << (void *)rhs.baseAddr << ") ";
 stream << ".rowBytes(" << rhs.rowBytes<< ")\n";
 stream << ".bounds(" << rhs.bounds<< ") ";
 return stream;
}

Note that the BitMap insertion function calls the Rect insertion function without any special syntax. C++’s ability to extend the language syntax to user-defined types allows this.

The style that I use shows the field names (preceded with a '.') followed by the value of the field in parentheses. Sample output for a Point, a Rect, and a BitMap, might look like this:

.v(1) .h(2) 
.t(3) .l(4) .b(5) .r(6) 
.baseAddr(0x12345678) .rowBytes(7)
.bounds(.t(3) .l(4) .b(5) .r(6) )

This is all you need to know to use streams with structs or classes that either have no private or protected members or provide accessors for all such members. But what if you want to stream private members? This situation will arise often as you develop your own classes. The solution is to implement the insertion operator overload as always, and declare it as a friend function when declaring your class. A trivial but complete example of this is included in the source files as the class privateMembers.

Suppose that you have already defined insertion operator functions for some purpose other than debugging. For example, if you are streaming objects for persistent storage, the streamed form of your objects may not be what you would like to see streamed into the debugger. One way to work around this problem is to subclass the ostream class and make dout an object of this new subclass. Now, instead of defining the insertion operator in terms of an ostream, create an insertion operator function based on the new subclass.

The Implementation

The first thing to know about the implementation of dout is that dout is a standard C++ library ostream. Stream objects are responsible for taking inserted data, formatting it, and passing it to objects of type streambuf. It is the streambuf object that decides where the data ultimately ends up. By subclassing streambuf, we make dout possible. The library contains a debugbuf class that inherits from streambuf.

The following code, from the top of the debugbuf.cp file shows the relationships of these objects:

static debugbuf debugstream;
ostream dout(&debugstream);

dout is a standard ostream. Like all ostreams it requires a streambuf object to function; so, in the constructor, we pass the address of an object of type debugbuf, which is derived from streambuf. All of our work is done in the object of type debugbuf.

Class Declarations

The first thing to notice about the declaration of the debugbuf class is that no destructor or constructors are declared. Let’s ignore this for the moment and look at the virtual functions inherited from streambuf in the protected section.

Listing 3: debugbuf.h

Declarations of debugbuf and debugbufinit

For debugbuf, virtual member functions of streambuf are declared as well as private members required for 
implementation. For debugbufinit the declaration does not have a memory footprint.

class debugbuf: public streambuf
{
 public:

    //debugbuf();
    //virtual ~debugbuf();

    // Construction and destruction are really handled by class debugbufinit. 
    // Initialization is done in the private routine init().

 protected:

    // These protected member functions are virtual functions in the parent 
    // (streambuf) class that we override to create our behavior.

    // The name overflow may be confusing -- this just outputs a character to the 
    // stream.
    // Calls outputchar().

 virtual int overflow(int c = EOF);

    // Since this is not an input stream, we want both pbackfail() and underflow() to 
    // return EOF (thus indicating failure). It turns out that the default behavior (the 
    // base class implementation) does just that.

    //virtual int pbackfail(int c = EOF);
    //virtual int underflow();

    // we don’t do input so always return EOF
 virtual int uflow() {return EOF;}

    // we don’t do input so always return 0 chars read
 virtual int xsgetn(char *, int) {return 0;}

    // Calls outputchar() for each character.
 virtual int xsputn(const char *s, int n);

    // We use the default behavior which returns a streampos that is in an invalid 
    // position. We do not support repositioning on this stream.

    //virtual streampos seekoff(streamoff off,
    //                 ios::seekdir way,
    //                 ios::openmode which =
    //                 ios::in | ios::out);

    //virtual streampos seekpos(streampos sp,
    //                 ios::openmode which =
    //                 ios::in | ios::out);

    // We don’t support setting the buffer so we use the default which is just to 
    // return “this.”

    //virtual streambuf *setbuf(char *s, int n);

    // There is nothing to sync with, so we just do the default which is to return
    // zero, indicating no error.

    // virtual int sync();

    // Actually, as an alternative implementation it would be possible to use this 
    // function to call our soft flush routine. In practice, there would be no different 
    // result. sync() is usually only called by pubsync(), which is usually only called
    // by flush(), which is usually only called by the endl manipulator function after 
    // it has streamed ‘\n’. So the soft flush would always follow a hard flush and 
    // result in a no-op.

 private:
 enum
 {
 kMaxDebugStrReadableString = 60,
 kSizeOfSemicolonG = 2,
 kSizeOfLengthByte = 1,
 kTabSize = 5,
 kStop = true
 };

    // the buffer
 char pbeg[ kSizeOfLengthByte +
 kMaxDebugStrReadableString +
 kSizeOfSemic olonG];

    // location of the next streamed char
 char *pnext;

    // This always points to the end of the readable string buffer. Once it is set in 
    // init(), it is never modified
 char *pend;

    // the number of queued alerts
 int alertCount;

 void init();

 void outputchar(char c);
 void formfeed();
 void horztab();
 void backspace();
 void verttab();
 void alert();
 void addchar(char c);
 void softflush();
 void flushdebugstring(int stop = false);
 void flushalerts();

 friend class debugbufinit;
};

class debugbufinit
{
 static unsigned int count;
 public:
 debugbufinit();

    // Our destructor is not virtual. It is important that objects of this class have no 
    // memory footprint. We will end up with one object of this class per translation 
    // unit (.cp file). If this class has any virtual member functions then objects of 
    // this class would have v tables in memory. Since this is not intended to be a 
    // base class for other class, there is no need to be virtual.

 ~debugbufinit();
};

Of the virtual functions we inherited from streambuf, four are for input, which we don’t support. For two, pbackfail and underflow, we can just accept the default behavior, and for the other two, uflow and xsgetn, we write trivial routines that return values which indicate that reading is not supported. Two other functions, seekoff and seekpos, are for positioning the stream pointer - another feature that we can’t support. We also do not allow the caller to set our buffer, so setbuf is not supported. The sync function is also unneeded. The only routines that really do any work are overflow, which calls our private member outputchar once, and xsputn, which calls outputchar once for each character passed to it.

Our private section includes some constants defined as an enum, the buffer and the pointers that we need to manage it, a counter for buffering SysBeep calls, and our private functions. I’ll discuss the private member functions later.

We finally return to the observation that instead of constructors and a destructor for debugbuf, a separate class, the debugbufinit class, is declared. This attempts to work around a problem with static objects. Before explaining the problem and what I’ve done about it, let me point out that I have not implemented a complete solution. Do not stream to dout in the constructor of a static (or global) object unless you are prepared for your application to crash. This is called “crossing the streams”. See Ghostbusters.

dout is a static object and, like all static objects, its constructor will be called before the first line of main is executed. But the first line of main is not the first line of code that is executed. If a static object streams data to dout in its constructor, this code may be executed before dout is constructed.

There is no way to reliably order construction of static objects in different translation units (.cp files), but we do know that within translation units, static objects are constructed in the order in which they appear. That is why we have the class debugbufinit and why the header file doutstream declares a static object of this type. Note that it is not declared extern. Each translation unit that includes doutstream has its own object of type debugbufinit (which is why it is important that it does not have a memory footprint).

When the debugbufinit object is constructed, it uses its static member, count, to determine if it is the first object of its class to be constructed. If it is, then it calls the init member of the static debugstream object. The init member performs the function of a constructor for the debugbuf class. This way, debugstream gets constructed only once, at the time of the first construction of a debugbufinit object. Since init may be called before or after the real constructor is called, it is important that the constructor is a “no op”.

P.J. Plauger explains this problem, along with the solution used in his implementation of the standard library streams (cout, cin, and cerr), in his book, The Draft Standard C++ Library, which I recommend. Close inspection reveals why my implementation is not a complete solution. Although I can guarantee proper construction of the debugstream object, the same cannot be said for the dout object.

I suspect that a complete solution exists for both Metrowerks and for Symantec, but I do not believe that any single solution works for both. In any case, the complete solution is left as an exercise for the reader (I’ve always wanted to say that).

Member Function Definitions

As the listing for debugbuf.cp shows, the implementation of both debugbuf and debugbufinit is straightforward.

Listing 4: debugbuf.cp

Definitions of debugbuf and debugbufinit

The debugbuf class manages a buffer using a switch statement to differentiate between characters with 
special meanings.

#include "doutstream"

#include <string.h>// for strlen() and strcpy()
#include <OSUtils.h> // for SysBeep();

static debugbuf debugstream;
ostream dout(&debugstream);

unsigned int debugbufinit::count = 0;

// this is debug code -- performance is not a goal

void debugbuf::init() // called by friend class debugbufinit
{
 pbeg[0] = '\0';
 pnext = pbeg + kSizeOfLengthByte;
 pend = pnext + kMaxDebugStrReadableString;
 alertCount = 0;
}


int debugbuf::overflow(int c)
{
 if (EOF == c)
 {
 return '\0';  // returning EOF indicates an error
 }
 else
 {
 outputchar(c);
 return c;
 }
}


int debugbuf::xsputn(const char *s, int n)
{
 for (int i = 0; i < n; ++i)
 {
 outputchar(s[i]);
 }
 return n;// we always process all of the chars
}


void debugbuf::outputchar(char c)
{
 switch (c)
 {
 case '\b':
 backspace();
 break;
 case '\f':
 formfeed();
 break;
 case '\n':
 flushdebugstring();
 break;
 case '\r':
 softflush();
 break;
 case '\t':
 horztab();
 break;
 case '\v':
 verttab();
 break;
 case '\a':
 alert();
 break;
 case '\0':
 case '\x03':
 flushdebugstring(kStop);
 break;
 default:
 addchar(c);
 break;
 }
}


void debugbuf::backspace()
{
 if (pbeg[0])  // if the buffer is empty, don’t bother
 {
 --pnext; 
 --pbeg[0];
 }
    // note that alerts cannot be backspaced away -- a possible enhancement
}


void debugbuf::formfeed()
{
 softflush();
 strcpy(pbeg, (char *)
 "\p_______________________________________________");
 pnext += strlen(pnext);
 flushdebugstring();
}


// both horizontal and verticle tabbing is done by brute
// force -- performance is not a goal
void debugbuf::horztab()
{
    // we don’t wrap tabs so if we are within kTabSize of
    // the end of the buffer then we just flush
 if (pend - pnext <= kTabSize)
 {
 flushdebugstring();
 }
 else
 {
 for (int i = 0; i < kTabSize; ++i)
 {
 addchar(' ');
 }
 }
}


void debugbuf::verttab()
{
 int position = pnext - &pbeg[1];
 flushdebugstring();
 for (int i = 0; i < position; ++i)
 {
 addchar(' ');
 }
}


void debugbuf::alert()
{
 ++alertCount;
}


void debugbuf::addchar(char c)
{
 *pnext++ = c;
 ++pbeg[0];
 if (pnext == pend)
 {
 flushdebugstring();
 }
}


void debugbuf::softflush()
{
 if ('\0' != pbeg[0])
 {
 flushdebugstring();
 }
 else
 {
 flushalerts();
 }
}

void debugbuf::flushdebugstring(int stop)
{
 if (!stop)
 {
 addchar(';');
 addchar('g');
 }
 flushalerts();
 DebugStr((unsigned char *)pbeg);
 pbeg[0] = '\0';
 pnext = &pbeg[1];
}


void debugbuf::flushalerts()
{
 while (alertCount)
 {
 --alertCount;
 SysBeep(30);
 }
}

debugbufinit::debugbufinit()
{
 if (0 == count++)
 {
 debugstream.init();
 }
}

debugbufinit::~debugbufinit()
{
 if (0 == --count)
 {
    // nothing to dispose, but we should flush
 debugstream.softflush();
 }
}

The main entry points are the protected members overflow and xsputn, both of which call outputchar. outputchar uses a switch statement to call one the following if the character is “special”: flushdebugstring, softflush, formfeed, horztab, backspace, verttab, or alert. If the character is “normal” we call addchar.

• If the character being processed is doutbackspace ('\b'), we reduce the length of the Pascal string in the buffer by one and back up the pointer by one character. Of course, we check first to be certain that there is at least one character in the buffer.

• If the character being processed is doutformfeed ('\f'), we flush any characters already in the buffer, fill the buffer with underscores, then flush the underscores.

• If the character being processed is a horizontal tab or douttab ('\t'), we treat it as if it were kTabSize (5) spaces, except that we don’t wrap remaining spaces to the next line. We don’t support tab stops.

• If the character being processed is a vertical tab or doutverttab ('\v'), we calculate how many characters are currently in the buffer, flush the buffer, and add a space character for each character that had been in the buffer.

• If the character being processed is an alert ('\a'), we increment the alert counter. Since all alerts are the same (just a call to SysBeep), we can “buffer” them with just a counter.

• If the character being processed is “normal”, we process it in addchar. The new character is added to the end of the Pascal string in our buffer. When the string fills the readable string buffer, we flush the buffer by calling flushdebugstring.

Notice that I said “the readable string buffer”. The buffer is actually two bytes larger than the largest Pascal string that we can handle. This is to save room to append a semicolon and the letter “g”.

Usually when DebugStr is called, MacsBug displays the Pascal string that is passed to it and waits for commands from the user. This is not really the behavior that we want. We want the string stored in the MacsBug buffer, but we don’t want to stop the application and drop into MacsBug every time data is streamed to dout. To work around this, we take advantage of the DebugStr/MacsBug command processing feature. When MacsBug receives the string passed to it by DebugStr, it displays the contents of the string up to, but not including, the first semicolon (if there is one). Any characters after the semicolon are treated as a command for MacsBug to execute.

By appending “;g” to the string passed in DebugStr, we cause MacsBug to execute the “g” or “go” command which resumes execution of the suspended application. Since we are going to append this to almost every call to DebugStr (the exceptions being when '\0' or EOT are streamed), we never let the Pascal string in the buffer to grow into the last two bytes of the buffer.

The softflush routine is called when the user streams doutsoftflush (‘\r'). We check to see if there are any characters in the buffer. If there are, we call flushdebugstring, and if there aren’t, we call flushalerts. Since flushdebugstring calls flushalerts, alerts are always flushed.

flushalerts calls SysBeep the number of times specified in alertCount and resets alertCount to zero.

The routine that actually calls DebugStr is flushdebugstring, which is called when the user streams '\n', '\0', or EOT. flushdebugstring takes a single parameter which is used to determine whether or not to append “;g” to the buffer before passing it to DebugStr. After appending the “;g” or not, we flush alerts with a call to flushalerts, call DebugStr, and then zero out the string in the buffer.

Bibliography and References

Information on using the standard C++ iostreams library is readily available. Any recently published work on ANSI C++ would include information on library usage. Implementation is a somewhat different matter. The dout Library would probably not have been possible without:

Plauger, P.J. The Draft Standard C++ Library. Prentice Hall, 1995.

For information on MacsBug:

Apple Computer. MacsBug Reference and Debugging Guide. Addison Wesley, 1990.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

TextSoap 8.4.1 - Automate tedious text d...
TextSoap can automatically remove unwanted characters, fix up messed up carriage returns, and do pretty much anything else that we can think of to text. Save time and effort. Be more productive. Stop... Read more
Backblaze 4.3.0.44 - Online backup servi...
Backblaze is an online backup service designed from the ground-up for the Mac. With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Numi 3.15 - Menu-bar calculator supports...
Numi is a calculator that magically combines calculations with text, and allows you to freely share your computations. Numi combines text editor and calculator Support plain English. For example, '5... Read more
EtreCheck 3.3.3 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
BusyContacts 1.1.8 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more
TunnelBear 3.0.14 - Subscription-based p...
TunnelBear is a subscription-based virtual private network (VPN) service and companion app, enabling you to browse the internet privately and securely. Features Browse privately - Secure your data... Read more
Apple Final Cut Pro X 10.3.4 - Professio...
Apple Final Cut Pro X is a professional video editing solution.Completely redesigned from the ground up, Final Cut Pro adds extraordinary speed, quality, and flexibility to every part of the post-... Read more
Hopper Disassembler 4.2.1- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32-bit and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about... Read more
Slack 2.6.2 - Collaborative communicatio...
Slack is a collaborative communication app that simplifies real-time messaging, archiving, and search for modern working teams. Version 2.6.2: Fixed Inexplicably, context menus and spell-check... Read more
Arq 5.8.5 - Online backup to Google Driv...
Arq is super-easy online backup for Mac and Windows computers. Back up to your own cloud account (Amazon Cloud Drive, Google Drive, Dropbox, OneDrive, Google Cloud Storage, any S3-compatible server... Read more

Latest Forum Discussions

See All

The best new games we played this week
We were quite busy this week. A bunch of big mobile games launched over the past few days, alongside a few teeny surprises. There're lots of quality games to load your phone with. We've gone and picked out five of our favorites for the week. [... | Read more »
Magikarp Jump beginner's guide
Magikarp Jump is a mystifying little game. Part Tamagotchi, part idle clicker, there's not a whole lot of video game there, per se, but for some reason we can't help coming back to it again and again. Your goal is to train up a little Magikarp to... | Read more »
Goat Simulator PAYDAY (Games)
Goat Simulator PAYDAY 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICES **iPhone 4S, iPad 2, iPod Touch 5 or better Goat Simulator: Payday is the most... | Read more »
GRID Autosport delayed until autumn
Sorry mobile racing fans -- GRID Autosport has been delayed a few months. The game is now expected to launch this fall on iOS. Feral Interactive announced that they wanted more time to work on the game's UI and overall performance before launching... | Read more »
Zombie Gunship Survival Beginner's...
The much anticipated Zombie Gunship Survival is here. In this latest entry in the Zombie Gunship franchise, you're tasked with supporting ground troops and protecting your base from the zombie horde. There's a lot of rich base building fun, and... | Read more »
Mordheim: Warband Skirmish (Games)
Mordheim: Warband Skirmish 1.2.2 Device: iOS Universal Category: Games Price: $3.99, Version: 1.2.2 (iTunes) Description: Explore the ruins of the City of Mordheim, clash with other scavenging warbands and collect Wyrdstone -... | Read more »
Mordheim: Warband Skirmish brings tablet...
Legendary Games has just launched Mordheim: Warband Skirmish, a new turn-based action game for iOS and Android. | Read more »
Magikarp Jump splashes onto Android worl...
If you're tired ofPokémon GObut still want something to satisfy your mobilePokémon fix,Magikarp Jumpmay just do the trick. It's out now on Android devices the world over. While it looks like a simple arcade jumper, there's quite a bit more to it... | Read more »
Purrfectly charming open-world RPG Cat Q...
Cat Quest, an expansive open-world RPG from former Koei-Tecmo developers, got a new gameplay trailer today. The video showcases the combat and exploration features of this feline-themed RPG. Cat puns abound as you travel across a large map in a... | Read more »
Jaipur: A Card Game of Duels (Games)
Jaipur: A Card Game of Duels 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: ** WARNING: iPad 2, iPad Mini 1 & iPhone 4S are NOT compatible. ** *** Special Launch Price for a limited... | Read more »

Price Scanner via MacPrices.net

Memorial Day savings: 13-inch Touch Bar MacBo...
B&H Photo has the 2016 Apple 13″ Touch Bar MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: - 13″ 2.9GHz/512GB... Read more
Apple refurbished 13-inch MacBook Airs availa...
Apple has Certified Refurbished 2016 13″ MacBook Airs available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: - 13″ 1.6GHz/8GB/128GB MacBook Air: $... Read more
Apple restocks refurbished 11-inch MacBook Ai...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models recently discontinued by Apple), available for up to $170 off original MSRP. An Apple one-year warranty is included with each... Read more
12-inch 1.2GHz Retina MacBooks on sale for up...
B&H has 12″ 1.2GHz Retina MacBooks on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: - 12″ 1.2GHz Space Gray Retina MacBook: $1449.99 $150 off... Read more
15-inch 2.7GHz Silver Touch Bar MacBook Pro o...
MacMall has the 15-inch 2.7GHz Silver Touch Bar MacBook Pro (MLW82LL/A) on sale for $2569 as part of their Memorial Day sale. Shipping is free. Their price is $230 off MSRP. Read more
Free Tread Wisely Mobile App Endorsed By Fath...
Just in time for the summer driving season, Cooper Tire & Rubber Company has announced the launch of a new Tread Wisely mobile app. Designed to promote tire and vehicle safety among teens and... Read more
Commercial Notebooks And Detachable Tablets W...
Worldwide shipments of personal computing devices (PCDs), comprised of traditional PCs (a combination of desktop, notebook, and workstations) and tablets (slates and detachables), are forecast to... Read more
Best value this Memorial Day weekend: Touch B...
Apple has Certified Refurbished 2016 15″ and 13″ MacBook Pros available for $230 to $420 off original MSRP. An Apple one-year warranty is included with each model, and shipping is free: - 15″ 2.6GHz... Read more
13-inch MacBook Airs on sale for up to $130 o...
Overstock.com has 13″ MacBook Airs on sale for up to $130 off MSRP including free shipping: - 13″ 1.6GHz/128GB MacBook Air (sku MMGF2LL/A): $869.99 $130 off MSRP - 13″ 1.6GHz/256GB MacBook Air (sku... Read more
2.8GHz Mac mini available for $973 with free...
Adorama has the 2.8GHz Mac mini available for $973, $16 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more

Jobs Board

*Apple* Media Products - Commerce Engineerin...
Apple Media Products - Commerce Engineering Manager Job Number: 57037480 Santa Clara Valley, California, United States Posted: Apr. 18, 2017 Weekly Hours: 40.00 Job Read more
Best Buy *Apple* Computing Master - Best Bu...
**509643BR** **Job Title:** Best Buy Apple Computing Master **Location Number:** 001482- Apple Valley-Store **Job Description:** **What does a Best Buy Apple Read more
*Apple* Media Products - Commerce Engineerin...
Apple Media Products - Commerce Engineering Manager Job Number: 57037480 Santa Clara Valley, California, United States Posted: Apr. 18, 2017 Weekly Hours: 40.00 Job Read more
*Apple* Mac and Mobility Engineer - Infogrou...
Title: Apple Mac and Mobility Engineer Location: Portland, OR Area Type: 12 month contract Job: 17412 Here's a chance to take your skills to the limit, learn new Read more
*Apple* Retail - Multiple Positions, White P...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.