TweetFollow Us on Twitter

Nov 95 Tips
Volume Number:11
Issue Number:11
Column Tag:Tips & Tidbits

Tips & Tidbits

By Steve Sisak, Contributing Editor

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

TIP OF THE MONTH

Two Screen MacsBug

One feature of MacsBug that I like is the "swap" command, which lets you leave a second monitor display the debugger (and punches it out of the desktop).

Then, if each DebugStr() ends in ";g" you will get an onscreen log of the last 10 or 15 breaks. I used this to track an elusive bug that would freeze my Mac and trash Macsbug memory... I could see which breakpoint went last.

Matt Slot

Informant in the Menu Bar

I do drivers, and you just plain can’t set a breakpoint in ADB completion routines (freezes the keyboard so MacsBug is worthless!).

So I throw one of the routines below into the routine to see when a piece of code gets executed.

What does it do? It "lights up" a bar (length dependant on screen resolution) in the menu bar. So if you DotToggle(300); you get a flashing short line in the menu bar.

[Leave this out of production code! Beware of using this on 24 bit color screens. Make sure that the value of where will not cause anything to be written into the alpha channel. Your best bet is to test with the screen that’s only 8 bits deep. -sgs]

void DotOn(long where) {
   long  *dot;
   dot = (long *)(LMGetScrnBase() + where);
   *dot |= -1;
}
void DotOff(long where) {
   long  *dot;
   dot = (long *)(LMGetScrnBase() + where);
   *dot &= 0;
}
void DotToggle(long where) {
   long  *dot;
   dot = (long *)(LMGetScrnBase() + where);
   *dot ^= -1;
}

Dave Fleck

Informative Cursors

One technique that I have used in the past where dropping into the debugger wasn't an option, and logging wasn't getting flushed in time/took too long, was to create a bunch of cursors numbering 00 - 99, and made a call to set the cursor and return the number of the previous cursor:

routine1()
{
short oldCursor = setDebugCursor(15);
    ...
    (void) setDebugCursor(oldCursor);
}

This way when the machine froze, the cursor would tell me what routine it had frozen in.

Tom Kimpton

MPW Editor Primitives

The MPW Command Reference describes 32 editor primitives which may be attached to any key sequence using the SetKey command. While the SetKey command itself is useful, the list of editor primitives alone is useful to MPW script writers.

Though only documented for use with SetKey, editor primitives may be used like any other MPW command: in scripts, command aliases, or AddMenu items. There are a couple of advantages:

1) They only work on the active window and have sharply defined functions, you don’t have to remember any selection expressions or argument lists. Compare:

 MoveStartOfFile

with

       Find • "{Active}"

2) They’re fast. I haven’t put a stopwatch to it, but you can see the difference immediately in running a script that uses the primitives and one that doesn’t.

The MPW Command reference lists these 32 primitives, the names of which should be self-explanatory:

DeleteCharLeft

DeleteCharRight

DeleteEndOfFile

DeleteEndOfLine

DeleteStartOfFile

DeleteStartOfLine

DeleteWordLeft

DeleteWordRight

MoveCharLeft

MoveCharRight

MoveEndOfLine

MoveLineDown

MoveLineUp

MovePageDown

MovePageUp

MoveStartOfFile

MoveStartOfLine

MoveWordLeft

MoveWordRight

SelectCharLeft

SelectCharRight

SelectEndOfFile

SelectEndOfLine

SelectLineDown

SelectLineUP

SelectPageDown

SelectPageUp

SelectStartOfFile

SelectStartOfLine

SelectWordLeft

SelectWordRight

There are also at least five primitives that aren’t in the command reference:

ScrollEnd

ScrollHome

ScrollPageDn

ScrollPageUp

DebuggerCommand

I can understand why Apple might not want users to casually drop into MacsBug from an MPW script, but I wonder why they chose not to document the scrolling commands? Whatever the reason, you should obviously use caution when playing with undocumented features.

Lee David Rimar
Absoft Corporation

Once Bitten Twice Shy

HGetState does not return a valid handle state when you pass it an empty handle (one whose master pointer is NULL). Instead, it returns an error code, so before you call HGetState, be sure to check that the handle isn’t empty and execute an alternate code path if it is.

I was bitten by this because I was using HGetState to determine if a handle was to a resource, and the resourced had been purged, so HGetStaate returned an error code instead of the handle flags and I incorrectly thought the handle wasn’t to a resource.

This is documented in Inside Macintosh, Memory, p. 1-61, but it bears some repeating. Remember to check the error values returned by the toolbox calls.

Eric Schlegel

 
AAPL
$101.67
Apple Inc.
+1.91
MSFT
$44.48
Microsoft Corpora
+0.40
GOOG
$521.48
Google Inc.
+0.63

MacTech Search:
Community Search:

Software Updates via MacUpdate

NTFS 12.0.39 - Provides full read and wr...
Paragon NTFS breaks down the barriers between Windows and OS X. Paragon NTFS effectively solves the communication problems between the Mac system and NTFS, providing full read and write access to... Read more
RestoreMeNot 2.0.3 - Disable window rest...
RestoreMeNot provides a simple way to disable the window restoration for individual applications so that you can fine-tune this behavior to suit your needs. Please note that RestoreMeNot is designed... Read more
Macgo Blu-ray Player 2.10.9.1750 - Blu-r...
Macgo Mac Blu-ray Player can bring you the most unforgettable Blu-ray experience on your Mac. Overview Macgo Mac Blu-ray Player can satisfy just about every need you could possibly have in a Blu-ray... Read more
Apple iOS 8.1 - The latest version of Ap...
The latest version of iOS can be downloaded through iTunes. Apple iOS 8 comes with big updates to apps you use every day, like Messages and Photos. A whole new way to share content with your family.... Read more
TechTool Pro 7.0.5 - Hard drive and syst...
TechTool Pro is now 7, and this is the most advanced version of the acclaimed Macintosh troubleshooting utility created in its 20-year history. Micromat has redeveloped TechTool Pro 7 to be fully 64... Read more
PDFKey Pro 4.0.2 - Edit and print passwo...
PDFKey Pro can unlock PDF documents protected for printing and copying when you've forgotten your password. It can now also protect your PDF files with a password to prevent unauthorized access and/... Read more
Yasu 2.9.1 - System maintenance app; per...
Yasu was originally created with System Administrators who service large groups of workstations in mind, Yasu (Yet Another System Utility) was made to do a specific group of maintenance tasks... Read more
Hazel 3.3 - Create rules for organizing...
Hazel is your personal housekeeper, organizing and cleaning folders based on rules you define. Hazel can also manage your trash and uninstall your applications. Organize your files using a... Read more
Autopano Giga 3.7 - Stitch multiple imag...
Autopano Giga allows you to stitch 2, 20, or 2,000 images. Version 3.0 integrates impressive new features that will definitely make you adopt Autopano Pro or Autopano Giga: Choose between 9... Read more
MenuMeters 1.8 - CPU, memory, disk, and...
MenuMeters is a set of CPU, memory, disk, and network monitoring tools for Mac OS X. Although there are numerous other programs which do the same thing, none had quite the feature set I was looking... Read more

Latest Forum Discussions

See All

Clips Review
Clips Review By Jennifer Allen on October 21st, 2014 Our Rating: :: CONVENIENT PASTINGUniversal App - Designed for iPhone and iPad Making copying and pasting more powerful than usual, Clips is a great way to move stuff around.   | Read more »
MonSense Review
MonSense Review By Jennifer Allen on October 21st, 2014 Our Rating: :: ORGANIZED FINANCESiPhone App - Designed for the iPhone, compatible with the iPad Organize your finances with the quick and easy to use, MonSense.   | Read more »
This Week at 148Apps: October 13-17, 201...
Expert App Reviewers   So little time and so very many apps. What’s a poor iPhone/iPad lover to do? Fortunately, 148Apps is here to give you the rundown on the latest and greatest releases. And we even have a tremendous back catalog of reviews; just... | Read more »
Angry Birds Transformers Review
Angry Birds Transformers Review By Jennifer Allen on October 20th, 2014 Our Rating: :: TRANSFORMED BIRDSUniversal App - Designed for iPhone and iPad Transformed in a way you wouldn’t expect, Angry Birds Transformers is a quite... | Read more »
GAMEVIL Announces the Upcoming Launch of...
GAMEVIL Announces the Upcoming Launch of Mark of the Dragon Posted by Jessica Fisher on October 20th, 2014 [ permalink ] Mark of the Dragon, by GAMEVIL, put | Read more »
Interview With the Angry Birds Transform...
Angry Birds Transformers recently transformed and rolled out worldwide. This run-and-gun title is a hit with young Transformers fans, but the ample references to classic Transformers fandom has also earned it a place in the hearts of long-time... | Read more »
Hail to the King: Deathbat Review
Hail to the King: Deathbat Review By Rob Thomas on October 20th, 2014 Our Rating: :: SO FAR AWAYUniversal App - Designed for iPhone and iPad Hail to the King: Deathbat may feel like “Coming Home” for Avenged Sevenfold’s faithful,... | Read more »
Find Free Food on Campus with Ypay
Find Free Food on Campus with Ypay Posted by Jessica Fisher on October 20th, 2014 [ permalink ] iPhone App - Designed for the iPhone, compatible with the iPad | Read more »
Strung Along Review
Strung Along Review By Jordan Minor on October 20th, 2014 Our Rating: :: GOT NO STRINGSUniversal App - Designed for iPhone and iPad A cool gimmick and a great art style keep Strung Along from completely falling apart.   | Read more »
P2P file transferring app Send Anywhere...
File sharing services like Dropbox have security issues. Email attachments can be problematic when it comes to sharing large files. USB dongles don’t fit into your phone. Send Anywhere, a peer-to-peer file transferring application, solves all of... | Read more »

Price Scanner via MacPrices.net

Strong iPhone, Mac And App Store Sales Drive...
Apple on Monday announced financial results for its fiscal 2014 fourth quarter ended September 27, 2014. The Company posted quarterly revenue of $42.1 billion and quarterly net profit of $8.5 billion... Read more
Apple Posts How-To For OS X Recovery
OS X 10.7 Lion and later include OS X Recovery. This feature includes all of the tools you need to reinstall OS X, repair your disk, and even restore from a Time Machine backup. OS X Recovery... Read more
Mac OS X Versions (Builds) Supported By Vario...
Apple Support has posted a handy resource explaining which Mac OS X versions (builds) originally shipped with or are available for your computer via retail discs, downloads, or Software Update. Apple... Read more
Deals on 2011 13-inch MacBook Airs, from $649
Daily Steals has the Mid-2011 13″ 1.7GHz i5 MacBook Air (4GB/128GB) available for $699 with a 90 day warranty. The Mid-2011 13″ 1.7GHz i5 MacBook Air (4GB/128GB SSD) is available for $649 at Other... Read more
2013 15-inch 2.0GHz Retina MacBook Pro availa...
B&H Photo has leftover previous-generation 15″ 2.0GHz Retina MacBook Pros now available for $1599 including free shipping plus NY sales tax only. Their price is $400 off original MSRP. B&H... Read more
Updated iPad Prices
We’ve updated our iPad Air Price Tracker and our iPad mini Price Tracker with the latest information on prices and availability from Apple and other resellers, including the new iPad Air 2 and the... Read more
Apple Pay Available to Millions of Visa Cardh...
Visa Inc. brings secure, convenient payments to iPad Air 2 and iPad mini 3as well as iPhone 6 and 6 Plus. Starting October 20th, eligible Visa cardholders in the U.S. will be able to use Apple Pay,... Read more
Textkraft Pocket – the missing TextEdit for i...
infovole GmbH has announced the release and immediate availability of Textkraft Pocket 1.0, a professional text editor and note taking app for Apple’s iPhone. In March 2014 rumors were all about... Read more
C Spire to offer iPad Air 2 and iPad mini 3,...
C Spire on Friday announced that it will offer iPad Air 2 and iPad mini 3, both with Wi-Fi + Cellular, on its 4G+ LTE network in the coming weeks. C Spire will offer the new iPads with a range of... Read more
Belkin Announces Full Line of Keyboards and C...
Belkin International has unveiled a new lineup of keyboard cases and accessories for Apple’s newest iPads, featuring three QODE keyboards and a collection of thin, lightweight folios for both the... Read more

Jobs Board

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
*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
Position Opening at *Apple* - Apple (United...
…customers purchase our products, you're the one who helps them get more out of their new Apple technology. Your day in the Apple Store is filled with a range of Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** At the Apple Store, you connect business professionals and entrepreneurs with the tools they need in order to put Apple solutions to work in their Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** The Apple Store is a retail environment like no other - uniquely focused on delivering amazing customer experiences. As an Expert, you introduce people Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.