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.*

 
AAPL
$99.18
Apple Inc.
-1.57
MSFT
$45.90
Microsoft Corpora
-0.46
GOOG
$568.27
Google Inc.
-9.09

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cocktail Family License (5 Macs) 7.6.1 -...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
Cocktail 8.0 Beta 2 - General maintenanc...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
QuickBooks 2015 16.0.0.1352 R1 - Financi...
QuickBooks 2015 helps you manage your business easily and efficiently. Organize your finances all in one place, track money going in and out of your business, and spot areas where you can save.... Read more
Mac DVDRipper Pro 5.0.1 - Copy, backup,...
Mac DVDRipper Pro is the DVD backup solution that lets you protect your DVDs from scratches, save your batteries by reading your movies from your hard disk, manage your collection with just a few... Read more
Apple OS X bash Update 1.0 - Fix for sec...
The OS X bash Update fixes a security flaw in the bash UNIX shell on OS X 10.9.5 (also on OS X 10.8 and 10.7 [see Related Links below]). OS X 10.9.5 or later Downloads for OS X 10.8 and OS X 10.7 in... Read more
SyncTwoFolders 2.0.5 - Syncs two user-sp...
SyncTwoFolders simply synchronizes two folders. It supports synchronization across mounted network drives and it is a possibility to run a simulation showing in a log what will be done. Please visit... Read more
FinderPop 2.5.7 - Classic Mac utility, n...
FinderPop is a Universal preference pane that extends OS X's contextual menus using a FinderPop Items folder much as the Apple Menu Items folder used to do for the Apple menu. It has other features... Read more
VueScan 9.4.45 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
LibreOffice 4.3.2.2 - Free Open Source o...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
calibre 2.4 - Complete e-library managem...
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... Read more

Latest Forum Discussions

See All

iKeywi - Customizable 5-Row Keyboard (U...
iKeywi - Customizable 5-Row Keyboard 1.0 Device: iOS Universal Category: Utilities Price: $.99, Version: 1.0 (iTunes) Description: Want to add an extra row to your iPhone/iPad? One of the most popular keyboard extension in iOS... | Read more »
Manage Your Cloud – Wunderlist Now Suppo...
Manage Your Cloud – Wunderlist Now Supports Dropbox Posted by Jessica Fisher on October 1st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Nexticy Review
Nexticy Review By Jennifer Allen on October 1st, 2014 Our Rating: :: IDEAL FORM CREATIONiPad Only App - Designed for the iPad Nexticy allows you to make your own forms for research purposes or to organize your business better. It’s... | Read more »
Tiny Troopers: Alliance Marches onto the...
Tiny Troopers: Alliance Marches onto the App Store Tomorrow Posted by Jessica Fisher on October 1st, 2014 [ permalink ] Tiny Troopers: Alliance, by Kukouri, is a | Read more »
HeroCraft Introduces Unlimited Sequel to...
HeroCraft Introduces Unlimited Sequel to WW2: Sandbox. Strategy & Tactics Posted by Jessica Fisher on October 1st, 2014 [ permalink ] | Read more »
RGB Express Review
RGB Express Review By Jennifer Allen on October 1st, 2014 Our Rating: :: DELIGHTFUL PUZZLINGUniversal App - Designed for iPhone and iPad Guide trucks along their delivery routes in RGB Express, a testing but charming puzzle game... | Read more »
The Sagas of Fire*Wolf (Games)
The Sagas of Fire*Wolf 1.0 Device: iOS Universal Category: Games Price: $9.99, Version: 1.0 (iTunes) Description: | Read more »
BuggyFun Review
BuggyFun Review By Amy Solomon on October 1st, 2014 Our Rating: iPad Only App - Designed for the iPad BuggyFun allows children to create their own tracks for bugs to interact with for a unique open-ended experience.   | Read more »
Fold the Adventure Review
Fold the Adventure Review By Jennifer Allen on October 1st, 2014 Our Rating: :: AWKWARD FOLDSUniversal App - Designed for iPhone and iPad Fold pieces of paper to create platforms for a princely rabbit in this puzzle game; something... | Read more »
WW2: Sandbox. Strategy & Tactics (G...
WW2: Sandbox. Strategy & Tactics 1.0.0 Device: iOS Universal Category: Games Price: $9.99, Version: 1.0.0 (iTunes) Description: ***NOTE: Compatible with iPhone 4s and up, iPad 2 and up - may not work properly on earlier devices... | Read more »

Price Scanner via MacPrices.net

Amazon offers 13-inch MacBook Air for $899, $...
Amazon.com has the 13″ 1.4GHz 128GB MacBook Air on sale for $100 off MSRP including free shipping: - 13″ 1.4GHz 128GB MacBook Air: $899.99 Read more
Apple resting On Its iPhone Laurels? – The ‘B...
Apple calls its new iPhone 6 and 6 Plus “The Biggest Advancements in iPhone History,” but does reality live up to the hype? “Seldom have so many waited so breathlessly for so little,” tweeted veteran... Read more
Roundup of Apple Mac and iPad Education disco...
Purchase a new Mac or iPad at The Apple Store for Education and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free,... Read more
Apple Boycotts German Magazine Computer Bild...
Apple has revoked its PR accreditation of Germany’s Computer Bild, Europe’s best-selling PC magazine, in reaction to Bild’s posting of a “#Bentgate” YouTube video. Axel Telzerow, editor in chief of... Read more
iPhone 6 & iPhone 6 Plus Available in Chi...
Apple has announced that iPhone 6 and iPhone 6 Plus will be available in China beginning Friday, October 17 from the Apple Online Store (http://www.apple.com), Apple’s retail stores, and an expansive... Read more
MacBook Airs on sale for $100 off MSRP, start...
Best Buy has the new 2014 MacBook Airs on sale for $100 off MSRP on their online store. Choose free home shipping or free local store pickup (if available). Prices valid for online orders only, in-... Read more
Apple Releases OS X Mavericks bash Update 1.0...
Apple has released a patch update for OS X Mavericks users to address the recently-detected “Shellshock” security bug in BSD UNIX’s bash shell. Apple says only a few Mac users who had manually... Read more
Pivotal Payments Ready for Apple Pay – FlexPo...
Pivotal Payments, a provider of merchant services and global payment processing solutions, has announced its proprietary FlexPoint platform will support credit and debit transactions through Apple’s... Read more
iStabilizer Announces Tabarm — First Friction...
iStabilizer, a specialist in universal lightweight compact tripods, steady cams, dollies, mounts, and remotes for smartphones, tablets, and cameras, announced today the iStabilizer tabArm, the first... Read more
IStabilizer Flex Smartphone Tripod Wins Usa T...
iStabilizer, a specialist in universal lightweight compact tripods, steady cams, and other products for smartphones, tablets, and cameras, has announced today that its iStabilizer Flex smartphone... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
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
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.