TweetFollow Us on Twitter

Book Review: Mac OS X Advanced Development Techniques

Volume Number: 19 (2003)
Issue Number: 7
Column Tag: Reviews

Book Review: Mac OS X Advanced Development Techniques

by Ron Davis

I have to confess that I worked with Joe Zobkiw on my first job out of college working on Virex almost ten years ago. I was one of the tech reviewers for his previous book A Fragment of Your Imagination, which covered the esoteric programming arts of init, cdev, and other code fragments. It was one of those books that covered stuff no other book covered, the really low level crap most of us attempt to avoid. At the time there was next to no documentation on coding these things and Zobkiw's book was written to meet that need.

Mac OS X Advanced Development Techniques (MADT) is like that book. Not that it talks about the stuff you are trying to avoid writing, but it is talking about the things no one else is. There isn't as much low level stuff you can mess with in OSX, but there are a lot of little nooks and crannies of code that need explanations. Need to write a System Preference panel? It's there. How about adding one of those system-wide menus? Got you covered. They're called Status Items, Chapter 9. Screen saver? Chapter 10.

It also covers some less stand-alone stuff, like threads, frameworks and how to talk between a Cocoa app and a command-line tool. There is also a good chapter of "snippets", little pieces of code you often want, but that don't merit a long discussion.

Section 1: Overview

In my opinion, this book is really aimed at the experienced OSX developer. The introduction says anyone who can compile a program in Project Builder can use it. I think you probably need a little more experience than that. I was interested in the book as a follow up to the various OSX development books I already had. If you have no understanding of Cocoa and want to write a screensaver, this book may not be the place to start.

Given the level of experience required for the book, I thought the first chapter was a waste of time. It is a very high level overview of MacOS in general and MacOS development. Most people already know about Quartz, Project Builder, FreeBSD.

The second chapter at first looked like more of the same, but I found the brief descriptions of the all of the developer applications helpful, if a little shallow. Especially interesting was the listing of command line tools useful to the developer.

Another general thing about the book. Zobkiw is a long time developer of Mac software and this book is plainly written assuming you are coming from a Mac background. If you're a Windows user or a UNIX guy, some stuff might go right by you, but none of it is really critical.

Section 2: Application Level

The first chapter with code in it is a document-based Cocoa app. This isn't a simple text edit style doc app either, but an app that watches Doppler radar pictures on the web and alerts you when a color in them change. I like that. I don't need another simple simple application, I want something that shows me a lot while it teaches the basics of a document based app.

The book also doesn't go through creation of the project step by step, but assumes you downloaded the project and just need it explained to you. This is appropriate for an advanced audience.

The only problem I had with the app was the document class uses readFromFile:ofType: and writeToFile:ofType instead of dataRepresentationOfType: and loadDataRepresentation:ofType which are what the standard document template creates for you. Nor does he mention these other routines and explain why one would be better or worse than the other.

The next two chapters discuss plug-ins, both Carbon and Cocoa. It is a very useful overview and explanation of how the various plug-in architectures work in OSX.

The last chapter in this section covers Frameworks, showing how to build both a Carbon and Cocoa version of a simple Framework.

Section 3: Enhancing the System

The second section of the book was advanced topics for the application writer. The third section covers how to build unusual non-applications. Specifically System Services, System Preference Panes, Status Items (system-wide menus), Screen Effects (screen savers), and Color pickers.

You've probably noticed the Services sub-menu of a lot of apps. Under 10.1 this was a dead give away you were using a Cocoa, but 10.2 made them available to Carbon apps as well. They are programs, normally faceless, that interact with the current selection. Zobkiw explains how to write one of these services, creating an example that changes the case of the selected text.

Next Zobkiw talks about how to write a System Preference panel. This allows you to provide a basic UI for faceless application that run all of the time. The example in this chapter sets the preference for the Service created in the previous chapter.

Zobkiw gives an informative discussion of the various kinds of little menus that are displayed in the menu bar on the right side. Some of these are Status Items, some of them Menu Extras. Technically, we developers are only allowed to create Status Items; Menu Extras are reserved for Apple. The example in this chapter is of a Status Item and not a Menu Extra.

I was always a little jealous of how Windows has a standard screen saver mechanism and OS9 didn't. Well that changed in OSX and now you can very easily write those screen savers yourself. They're so easy the chapter explaining them is only 7 pages long. It is still a good introduction that leaves you with a place to start writing your own. If you are going to do a lot of Screen Effects work, you will want to get Saver Lab (http://www.dozingcat.com/), which allows you to run your screen saver in a window for debugging.

The last esoteric piece of code in this section is a Color Picker. The OSX Color Picker is actually a collection of pickers. When you open it there is a list of icon buttons at the top of the window that let you pick from a number of pickers. Third party developers can create their own picker panels using Cocoa. Chapter 11 gives you the details on how to do this.

Section 4: Advanced Methods

Threads is the first of the advanced topics discussed, which gives you an overview of what threads are and how they work, and gives you an example of how to use them.

Terminal is the name of the next chapter, but it is really about NSTask and another thread example. Of all the chapters, this was the one I liked the least, because I felt it didn't really cover the topic and was just kind of wrong. He tells you how to use an NSTask to launch a UNIX command line command, but when he does one that you have to wait to return, he uses a thread that polls for the result. It really should have used the notifications NSTask has built into it. That is the right way to do it and the code would have been simpler.

The last two topics covered by their own chapters were XML-RPC and SOAP. These chapters give a basic introduction to using WebServices both in PHP and Cocoa. The PHP for the server made sense, though I was a little surprised Zobkiw did a PHP client. He also builds a client in Cocoa using the WebServices API in CoreServices. These two chapters are very similar. If you have a preference for one remote procedure call methodology over the other, you probably only need to read one of these chapters.

The last chapter of the book is a collection of snippets. Bits and pieces of code that you will find useful, but don't rate a full chapter. This may be the section you find most useful.

Summary

Overall I would say this book is a must have for a complete Cocoa bookshelf. It covers topics no other book covers and does it in a concise, referenceable way.


Ron Davis is a long time Macintosh Software Engineer, having worked for companies like Apple, and Metrowerks on a variety of products from development tools to anti-virus software. His day job is working for Alsoft, and his evening job is R.A.D. Productions, makers of Suck It Down and FinderEye.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

How to become the ultimate robot warrior...
Chrono Strike is a delightfully immersive beat ‘em up with a sense of humor (any game with a good Sims reference gets points in my book). [Read more] | Read more »
Tips and tricks to get a higher score in...
Snow Roll is a devilish endless runner very much in the vein of Flappy Bird. It revels in its dastardly level of difficulty, and doesn’t really care how angry you get at it as it knows you’ll keep coming back for more. [Read more] | Read more »
How to win big in Slots Deluxe
Cheating while gambling is illegal and morally wrong, and in some parts of the world it leads to men with names like Vinnie "Six Knuckles" Manchenzo beating you to a pulp in a dark alley. [Read more] | Read more »
How to take over the world in Dictator 2
Running a country isn't easy - especially when you're a dictator who wants to take over the world and crush everyone in your path while you do it. [Read more] | Read more »
Tips and tricks to get a higher score in...
Tank.iois - you guessed it! - another multiplayer arena battler likeAgar.io and Slither.io. It does differentiate itself by putting you in a tiny tank though, so it's not exactly the same. To help you get that all-important high score, we've got a... | Read more »
How to unlock characters in One Tap Tenn...
As the title suggests, One Tap Tennis requires only a single tap to play its particular brand of tennis, and rewards you with a ton of unlockable characters if you perform well. Fortunately for you, we at 148Apps have got a few tips and tricks to... | Read more »
Grab it now: Game Craft’s Legend of War...
The real time strategy game is now available for you to sink your teeth into, through the App Store and Google Play. Combining elements of skill, strategy and empire building, Legend of War is a real gamers’ game. [Read more] | Read more »
Skateboard Party 3 ft. Greg Lutzka (Gam...
Skateboard Party 3 ft. Greg Lutzka 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Skateboard Party is back! This third edition of the popular sports franchise features professional skater... | Read more »
Cubious (Games)
Cubious 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Cubious – How smart are you? How high is your IQube? Solve the impossible puzzles to find out, and help a lost little cube find his... | Read more »
Goat Simulator Waste of Space (Games)
Goat Simulator Waste of Space 1.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.1 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICESiPhone 4S, iPad 2, iPod Touch 5 or better.** | Read more »

Price Scanner via MacPrices.net

12-inch 1.2GHz Space Gray Retina MacBook avai...
Amazon has the new 12″ 1.2GHz/512GB Space Gray Retina MacBook (Apple model #MLH82LL/A) available for $1549 including free shipping. Their price is $50 off MSRP. B&H has the 12″ 1.2GHz/512GB Space... Read more
Apple refurbished Mac Pros available for up t...
Apple has Certified Refurbished Mac Pros available 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 following... Read more
Enterprise Workers Pick Technology Over Perks...
New Adobe study shows surprising attitudes about office jobs and where the future of work is heading. Adobe has released survey findings revealing that a surprising 70 percent of U.S. office workers... Read more
Memorial Day Weekend Sale: $50-$100 off 11-in...
B&H Photo has 13″ and 11″ MacBook Airs with 256GB SSDs on sale for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/256GB MacBook Air: $999 $100 off MSRP... Read more
Memorial Day Weekend Sales: Apple MacBook Pro...
B&H Photo has 13″ and 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz... Read more
Memorial Day Weekend Sales: Apple iMacs and M...
Take up to $150 off the price of a new iMac or Mac mini at the following Apple resellers this Memorial Day weekend: iMacs: B&H Photo has 21″ and 27″ iMacs on sale for up to $150 off MSRP... Read more
Apple refurbished Retina MacBook Pros availab...
Apple has Certified Refurbished 2015 13″ and 15″ Retina MacBook Pros available for up to $380 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Goal Zero and OtterBox Partner to Expand iPh...
Goal Zero, specialists in portable power, have announced a partnership with OtterBox, brand smartphone case protection, to offer the Slide and Slide Plus Batteries as modules compatible with the new... Read more
15-inch Retina MacBook Pros on sale for up to...
B&H Photo has 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz Retina... Read more

Jobs Board

Senior *Apple* Engineer - Signature Technol...
One-year contract for an Apple consultant. The resource should be an Apple Certified Technical Coordinator or get the certification within 60 days of starting Read more
Senior *Apple* Engineer - Signature Technol...
One-year contract for an Apple consultant. The resource should be an Apple Certified Technical Coordinator or get the certification within 60 days of starting Read more
*Apple* Architect - AECOM (United States)
**Requisition/Vacancy No.** 132759BR **Position Title** Apple Architect **Job Category** Information Technology **Business Line** Government **Country** United Read more
*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Project Engineer - Smart Source Inc...
SmartSource is in need of an Apple Project Engineer for a 12 month contract opportunity in Pittsburg, PA. Role: Apple Project Engineer Location: Pittsburg, PA Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.