TweetFollow Us on Twitter

June 93 - Letters


I just finished reading the debugging article in Issue 13 and I wondered if you had ever written up anything about this one:
	LHdl = ^LPtr;

{$S Fill_Seg}
PROCEDURE FillWithData(h:Handle);
h^^ := 23;

{$S Main}

PROCEDURE CanYouSpotTheProblem;

	h :LHdl;

	h := LHdl(NewHandleClear(Size));
I call this "Routines That Don't Move Memory, Most of the Time." The problem comes about because of the hidden trap to LoadSeg. If all the code resources are preloaded, everything is OK. But if they aren't, the call to FillWithData may cause a memory move, and h is not locked. This is especially vile and nasty when, like us, you run in a very limited heap and unload your code frequently. I know that if you read Inside Macintosh Volume II very carefully this is clear. But most of the interesting examples are the ones that are well documented but hard to catch.
--Bob Tipton

Thanks for the example. You're right, of course; calling routines in other, unloaded segments can indeed move memory. This is documented in various places, but unless you understand very clearly how your program occupies memory and how the Segment Loader works, it's easy to overlook. Judicious use of a good heap scramble/purge will catch this one before it catches you. Thanks for writing!
--Dave Johnson

I was looking for the WorldScript folder on Issue 12's Developer CD, "Wayne's GWorld" (Dev.CD Nov/Dec 92). According to the Contents Catalog stack, the WorldScript folder should be found in this path: Dev.CD Nov/Dec 92: System Software: WorldScript. But it's not there. I talked with a friend of mine who has the same CD, and he found the folder where it's supposed to be. We checked our CDs and found out that his says 564.6 MB on disc, 69.7 MB available, while mine says 555.5 MB on disc, 78.9 MB available. What's going on?
--Toru Kawate

P.S. Thank you for the fine journal and CD. I really enjoy them.

I received Issue 12 of develop with the Nov/Dec 1992 Developer CD Series disc. I enjoy the Developer CD but had the following trouble: I used the Contents Catalog on the CD and found the title"WorldScript." But I didn't find the folder at the pathname Dev.CD Nov/Dec 92: System Software: WorldScript.
--Hirokazu Yaguchi

At the last minute, WorldScript was pulled from the CD accompanying develop, but there wasn't enough time to remove it from the Contents Catalog. WorldScript did, however, remain on the Developer CD Series disc received monthly by members of Apple's developer programs. The reason for this is tied in with why develop now has its own CD, separate from the Developer CD Series disc; for details, see the editorial on page 2.
--Caroline Rose

Sorry to disturb you, but because I've had problems with my subscription (two copies, no copies) -- which I've worked out, I think, with the DEV.SUBS people -- I'm wondering: Is there some sort of publication schedule available that will allow me to fret about this without disturbing anyone? ("Gee, it's two weeks past when this should be out . . . what am I missing out on?!")

Y'all are doing a fine job. Just be sure to run your issues through a Quark SmugCheck to keep the content only kinda wacky and smug without being too much that way. Thanks!
--J. C. Burns

I'm sorry you've had subscription problems, but I'm grateful that you pursued them with DEV.SUBS rather than sending an AppleLink to CROSE or DEVELOP; many developers make the mistake of contactingdevelop staff with these problems, but it's really out of our realm. We are, however, doing our best to make the problems go away.

If you're located in the U.S., you should normally receive develop around the first of March, June, September, and December. (If you're outside the U.S., it's hard to say, because develop might need to wait for other materials to be merged into the same mailing.)

Thanks for the tip on SmugCheck; it's just what we need!
--Caroline Rose

I notice you still add the numbers in references to Tech Notes. If dropping the numbers were such progress, that wouldn't be necessary. And the new alphanumeric reference codes are not used.

I'm a technical person who is used to abbreviations everywhere for conciseness. Besides, citing with full titles adds noise and a lot of repetitiveness.
--Peter Fink

We decided to include the old numbers in references to Tech Notes to help out those people who like to use hard copy but still have the numbered versions. We'll stop doing that once enough time has elapsed that we expect everyone will have the new, unnumbered versions.

For a variety of reasons, we decided not to include the new designations, such as "M.PT.StandAloneCode," which identify the category/folder for each Note. We figured people could find the Notes in the new file organization easily enough -- a Note on QuickTime is in the QuickTime folder, right? But we've since realized that the category isn't always obvious. So starting with this issue we refer to Notes by category -- for example, "See the Macintosh (Platforms & Tools) Technical Note, 'Stand-Alone Code, ad nauseam.'"

Many developers simply look up specific notes in the various Tech Note indexes, and don't use the special designations at all. For those who do use them, they've been improved to correlate more closely to the Notes' titles; for more on this and other recent Tech Note improvements, see the box on this page.

We're always open to suggestion, but so far you're the only one to mention this. If others reading this reply have similar feedback, I hope they'll let us know.
--Caroline Rose



On the August 1992 Developer CD Series disc, the new organization of Macintosh Technical Notes made its debut. Since then, we've been listening for suggestions for improvement. The vast majority of the feedback has been positive, but you did point out a few areas for attention:

  • Better name correlation: Filenames, titles, and designations like "M.PT.StandAloneCode" needed to be more tightly bound to one another. The latest release fixes this problem; Tech Notes should be easier to find across the print and electronic versions.
  • Organization: Tech Notes are now organized alphabetically by title within each section. This was always the intention, but because filenames and titles didn't really match, things were a little haphazard.
  • Locating items in print: We've added the designation to the footer of each note, so you can quickly tell where you are as you flip through the pages.

Many of you have asked how to quickly locate the most recently written and updated Tech Notes. On the CD, aliases to the latest Notes can always be found in the "What's new on this CD?" folder. Using the Finder's View by Date option on the category folders is a handy way to see the most recent updates.

Also, please note that to group related information more logically, we've integrated Q&As into the Tech Note library. Q&As appear at the beginning of every section in the print version, and have the label "Essential" in the electronic version (or a different label if you've changed that label name on your system).

Many of you noticed that the Tech Note and Q&A stacks have gone away: the Tech Note library is now available in Apple DocViewer format (as well as Microsoft Word files). You should find the searching and viewing in Apple DocViewer much more usable; please check it out.

These changes should make information much easier to find. As always, if you have suggestions or ideas for improving the Tech Note library, please let me know!

Thanks to Doug McKenna, the author of Resorcerer, for pointing out these problems.

WE WORRY WHEN YOU DON'T WRITE We welcome timely letters to the editors, especially from readers reacting to articles that we publish in develop. Letters should be addressed to Caroline Rose (or, if technical develop-related questions, to Dave Johnson) at Apple Computer, Inc., 20525 Mariani Avenue, M/S 75-2B, Cupertino, CA 95014 (AppleLink CROSE or JOHNSON.DK). All letters should include your name and company name as well as your address and phone number. Letters may be excerpted or edited for clarity (or to make them say what we wish they did). *

Send your feedback on Tech Notes or Sample Code to Neil at AppleLink NMDAY or on the Internet at*


Community Search:
MacTech Search:

Software Updates via MacUpdate

Suitcase Fusion 6 17.3.0 - Font manageme...
Suitcase Fusion 6 is the creative professional's font manager. Every professional font manager should deliver the basics: spectacular previews, powerful search tools, and efficient font organization... Read more
Nisus Writer Pro 2.1.2 - Multilingual wo...
Nisus Writer Pro is a powerful multilingual word processor, similar to its entry level products, but brings new features such as table of contents, indexing, bookmarks, widow and orphan control,... Read more
calibre 2.40.0 - Complete e-book library...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian... Read more
Vivaldi - An advanced browser...
Vivaldi is a browser for our friends. In 1994, two programmers started working on a web browser. Our idea was to make a really fast browser, capable of running on limited hardware, keeping in mind... Read more
OmniPlan 3.0 - Robust project management...
With OmniPlan, you can create logical, manageable project plans with Gantt charts, schedules, summaries, milestones, and critical paths. Break down the tasks needed to make your project a success,... Read more
Yummy FTP 1.11 - FTP/SFTP/FTPS client fo...
Yummy FTP is an FTP + SFTP + FTPS file transfer client which focuses on speed, reliability and productivity. Whether you need to transfer a few files or a few thousand, schedule automatic backups, or... Read more
Tweetbot 2.1 - Popular Twitter client. (...
Tweetbot is a full-featured OS X Twitter client with a lot of personality. Whether it's the meticulously-crafted interface, sounds and animation, or features like multiple timelines and column views... Read more
MacPilot 8.0 - Enable over 1,200 hidden...
MacPilot gives you the power of UNIX and the simplicity of Macintosh, which means a phenomenal amount of untapped power in your hands! Use MacPilot to unlock over 1,200 features, and access them all... Read more
Typinator 6.7 - Speedy and reliable text...
Typinator turbo-charges your typing productivity. Type a little. Typinator does the rest. We've all faced projects that require repetitive typing tasks. With Typinator, you can store commonly used... Read more
Adobe Lightroom 6.2 - Import, develop, a...
Adobe Lightroom is available as part of Adobe Creative Cloud for as little as $9.99/month bundled with Photoshop CC as part of the photography package. Lightroom 6 is also available for purchase as a... Read more

Balloony Land offers a fresh twist on th...
Balloony Land by Palringo offers a fresh twist on the match three genre and is out now on iOS and Android. First-off, you'll be popping balloons instead of crushing candy and the balloons will float up and fill the empty spaces instead of dropping... | Read more »
Sago Mini Babies (Education)
Sago Mini Babies 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: Introducing the Sago Mini babies. Boys and girls love caring for these adorable characters. Feed Robin her favorite mush... | Read more »
PAUSE - Relaxation at your fingertip (H...
PAUSE - Relaxation at your fingertip 1.1 Device: iOS iPhone Category: Healthcare & Fitness Price: $1.99, Version: 1.1 (iTunes) Description: | Read more »
Super Sharp (Games)
Super Sharp 1.1 Device: iOS Universal Category: Games Price: $1.99, Version: 1.1 (iTunes) Description: Your finger has never been so sharp! Cut with skill to complete the 120 ingenious physics levels of Super Sharp and become a cut... | Read more »
Assembly - Graphic design for everyone...
Assembly - Graphic design for everyone 1.0 Device: iOS Universal Category: Photography Price: $2.99, Version: 1.0 (iTunes) Description: Assembly is the easiest most powerful design tool on the App Store. Create anything you can... | Read more »
Dub Dash (Games)
Dub Dash 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: ARE YOU READY FOR THE ULTIMATE CHALLENGE? UNIQUE SYMBIOSIS OF MUSIC AND GRAPHICS | Read more »
Leave Me Alone (Games)
Leave Me Alone 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: 33% off launch sale!!! Somewhere between the 1980s and 1990s there exists a world that never was. A world of skatepunks,... | Read more »
YAMGUN (Games)
YAMGUN 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: The invasion has begun! Protect the walls of the citadel against waves of enemies! But watch out, you will soon run out of ammo...... | Read more »
Chesh (Games)
Chesh 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: It’s like chess, only not at all. ***40% off for a limited time to celebrate our launch!*** Chesh is a game of skill, strategy, luck,... | Read more »
Dust: An Elysian Tail (Games)
Dust: An Elysian Tail 1.051 Device: iOS Universal Category: Games Price: $5.99, Version: 1.051 (iTunes) Description: *Dust: An Elysian Tail is a visually rich experience and thus requires devices with 1GB RAM**Please note that... | Read more »

Price Scanner via

TP-LINK Next-Gen Routers Support a Large Numb...
TP-LINK, specialists in consumer and business networking products, have announced the availability of Archer C2600, the company’s next-generation router featuring wireless AC, multi-user MIMO, and 4-... Read more
Apple’s Education discount saves up to $300 o...
Purchase a new Mac or iPad using Apple’s Education Store and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free, and... Read more
Save up to $350 with Apple refurbished iMacs
Apple has Certified Refurbished iMacs available for up to $350 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 27″ 3.5GHz 5K iMac – $1949 $350 off MSRP - 27... Read more
Mac Pros on sale for up to $300 off MSRP
B&H Photo has Mac Pros on sale for up to $300 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2818.99, $181 off MSRP - 3.5GHz 6-core Mac Pro: $3699... Read more
5K iMacs on sale for up to $150 off MSRP, fre...
B&H Photo has the 27″ 3.3GHz 5K iMac on sale for $1899.99 including free shipping plus NY tax only. Their price is $100 off MSRP. They have the 27″ 3.5GHz 5K iMac on sale for $2149, $150 off MSRP... Read more
Twelve South Redesigns BookArc For Today’s Sm...
Twelve South has announced a redesigned version of their very first product, BookArc for MacBook. Tailored specifically for the newest generation of MacBooks, BookArc holds the new, smaller Apple... Read more
Phone 6s Tips & Tricks – Tips Book For iP...
Poole, United Kingdom based Tap Guides Ltd. has announced the release and immediate availability of iPhone 6s Tips & Tricks, an in-depth eBook available in the iBookstore that’s priced just $2.99... Read more
Apple refurbished 2014 13-inch Retina MacBook...
Apple has Certified Refurbished 2014 13″ Retina MacBook Pros available for up to $400 off original MSRP, starting at $979. An Apple one-year warranty is included with each model, and shipping is free... Read more
13-inch 2.5GHz MacBook Pro on sale for $994,...
Best Buy has the 13″ 2.5GHz MacBook Pro available for $994.99 on their online store. Choose free shipping or free instant local store pickup (if available). Their price is $105 off MSRP. Price valid... Read more
Is The iPad Pro Really A Serious Laptop Repla...
Probably not, at least for productive professionals and other power users. Steve Jobs declared that we’d entered the “post-PC Era” with the advent of the original iPad in 2010, a phrase we don’t hear... Read more

Jobs Board

*Apple* Desktop Analyst - KDS Staffing (Unit...
…work with some of the brightest engineers. Job Description Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Points:Depth of Read more
*Apple* Retail Online, Customer Experience R...
**Job Summary** Apple Retail's Online Store sells Apple products to customers around the world. In addition to selling Apple products with unique services such Read more
Frameworks Engineer, *Apple* Watch - Apple...
**Job Summary** Join the team that is shaping the future of software development for Apple Watch! As a software engineer on the Apple Watch Frameworks team you will Read more
Senior Manager, Global Direct Marketing *App...
**Job Summary** Apple Retail is looking for an experienced Direct Marketing Leader to join its Marketing team. This position will take a leadership role in creating Read more
*Apple* Online Store Expansion - Apple (Unit...
**Job Summary** The Online Apple Store is seeking a person to lead its expansion into new countries. Based in Cupertino, CA, this person will develop and maintain an Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.