TweetFollow Us on Twitter

June 93 - Letters

LETTERS

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

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


{$S Main}

PROCEDURE CanYouSpotTheProblem;

VAR
	h :LHdl;

BEGIN
	h := LHdl(NewHandleClear(Size));
	FillWithData(h);
END.
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

WHERE IN THE WORLD(SCRIPT)?
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

WHEN TO EXPECT DEVELOP
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

M.TN.DESIGNATIONS
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

TECH NOTES AND Q&AS: STATE OF THE UNION

BY NEIL DAY, TECH NOTE AND SAMPLE CODE POOH-BAH

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 nmday@apple.com.*

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Airmail 3.3.2 - Powerful, minimal email...
Airmail is an mail client with fast performance and intuitive interaction. Support for iCloud, MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo!, AOL, Outlook.com, Live.com. Airmail was designed... Read more
Numi 3.15.1 - Menu-bar calculator suppor...
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
Airmail 3.3.2 - Powerful, minimal email...
Airmail is an mail client with fast performance and intuitive interaction. Support for iCloud, MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo!, AOL, Outlook.com, Live.com. Airmail was designed... Read more
Numi 3.15.1 - Menu-bar calculator suppor...
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
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
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

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* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, 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* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, 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* 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.