TweetFollow Us on Twitter

Sep 92 Tips
Volume Number:8
Issue Number:5
Column Tag:Tips & Tidbits

Tips & Tidbits

By Neil Ticktin, Editor

This column is your opportunity to spread the word about little bits of information that you find out about. These tidbits can be programming related or they can be user tips that are particularly useful to programmers.

MacTutor will credit, in subscriptions or orders, $25 for every tip used, and $50 for the Tip of the Month. To submit a tip, send in a letter to the magazine.

Remember, AppleLink is our preferred communication method, but feel free to send something via America Online, GEnie or US Mail. If you do send snail mail, enclose a printed copy and a disk copy of the letter so that it does not have to be retyped.

Let us know what you think. Remember, this is your magazine. Try ‘em out and let us know...

Tip of the Month

When you have several applications running at once, and you hit the interrupt button, you will break into the application that happens to be executing at that time, which is not necessarily the one you want to debug.

To choose which application you break into, make sure that application is frontmost. Now hold down the mouse button somewhere over the menu bar (an empty portion will do), and with your other hand, press the interrupt button. You will end up in the desired application, somewhere in the middle of a call to MenuSelect.

Lawrence D’Oliveiro, Computer Services Dept

University of Waikato, Hamilton, New Zealand

MPW MAKE TIP #1

The Make tool in MPW differs from the UNIX original in that it only generates the build commands; it cannot execute them. Apple provides a script called BuildProgram, that invokes Make, captures the output in a temporary script file, and executes it. However, when you’re still at the stage of flushing out syntax errors from your code, it is quicker not to use BuildProgram. Instead, use Make, and capture its output in a temporary window, such as the Worksheet window. Select the generated commands and execute them.

When you hit a syntax error, find the compilation command where the error was encountered, and delete all the commands prior to this-that is, all the commands that were successfully completed. Find and fix the syntax errors in your source file. Now instead of reinvoking BuildProgram or Make, simply reselect the leftover build commands, and reexecute them. Continue in this fashion, deleting the completed commands each time you hit an error, until you’ve completed the build.

If you’ve got nothing else but build commands in the temporary window and you’re using MPW version 3.2 or later, you can quickly select the commands to be deleted, once you’ve found the beginning of the command where the error occurred, by typing command-option-shift-uparrow to select from the current position to the beginning of the file.

- Lawrence D’Oliveiro, New Zealand

MPW MAKE TIP #2

Many Makefiles are written with an initial rule that looks like this:

Everything ƒ Prog1 Prog2 Prog3

where Prog1, Prog2 and so on are the actual programs comprising the project. This is done so that if you invoke Make without any arguments, it will look for the first target by default, and putting this rule first will cause it to build the entire project.

However, if your project grows with more and more components, this becomes another rule that you have to remember to maintain in your Makefile. A more convenient technique is to invoke Make with the following command:

Make `Make -r`

The inner Make -r command returns a list of the “root” targets (that is, no other targets depend on these); the outer Make command builds all these targets. Now you can get rid of the Everything rule, and just keep adding new rules for the new components of your project, without having to worry about updating any existing rules.

- Lawrence D’Oliveiro, New Zealand

MPW BACKUP TIP #1

MPW’s Backup tool is very useful for backing up your projects, but things can get slightly complicated if there are too many files to fit on one disk. Without the -a option, Backup will only back up changed files; it won’t copy any files that aren’t already on the current backup disk.

But if you’ve been adding lots of files to your project, deciding which files should go onto which disks-and making sure you’ve backed them all up-can be too much trouble. You can make things much easier if you group your files into subfolders; just make sure that the contents of each subfolder will fit on one backup disk. Then you can use the command form Backup -a -r -level 1; the -r option means to check subfolders (and subfolders of subfolders, and so on), and -level 1 restricts the effect of -a (backup new as well as changed files) so it only applies to subfolders on down, not to files at the top level. This allows you to keep a handful of central files, such as your Makefile, at the top level, and they will only be backed up once.

If you have to move files from one subfolder to another, add the -d option to the Backup command; this will delete the moved files from their old subfolders on the backup disks.

Now, if Duplicate would only preserve the window positions of the icons it copies, my happiness would be complete...

- Lawrence D’Oliveiro, New Zealand

MPW BACKUP TIP #2

The following pair of commands will do a backup from the current directory onto a folder with the same name on a floppy disk in drive 1:

Set CurFolder "`Directory -q | 
 StreamEdit -d -e 
'/( :)*([¬:]*:)®1 / print ®1'`"

Backup -a -r -level 1 -from 
 : -to `Volumes 1`"{CurFolder}"

This uses the StreamEdit tool which was introduced in MPW 3.2. Put it on a custom menu somewhere in your UserStartup script, then you’ll never have to type it again...

- Lawrence D’Oliveiro, New Zealand

HIDING LAYERS FROM HYPERCARD

The following line of HyperTalk, executed from HyperCard 2.1, will hide the frontmost application:

DoMenu line 1 of menu "Application"

This works even if executed from a script running in the background! You can try other items in the application menu as well, but this doesn’t work for the “System Help” menu.

The same thing should also work from one of your own applications: call SystemMenu, passing it a menu ID of

-16489 (the application menu) and the appropriate item ID (e.g., 1 to hide the frontmost application, 2 to hide all but the frontmost, and 3 to show all applications).

- Lawrence D’Oliveiro, New Zealand

A 68040 Bug

A few months ago a rather large application I wrote started "hanging" on a Quadra 700. After poking around I tracked the problem to a small assembly language routine which is used to allow main thread and interrupt code to access the same linked list of messages.

The problem arises when the CAS2 instruction is used in the following form:

CAS2.l  Dn:Dn,D1:D0,(A0):(A1)

When the comparison fails, Dn gets updated from the second memory operand, (A1), instead of the first memory operand. Motorola has just verified the bug. A portion of Motorola's response, as relayed to me through DTS, says...

"I am responding to your question on the CAS2 instruction. You have indeed found a bug. Your analysis is correct.

If the compare registers for CAS2 are the same and the comparisons with the memory operands fail, then the FIRST memory operand should be stored in the data register, however, the 68040 incorrectly stores the second memory operand in the data register."

Note that this problem does not exist on the 68020 or the 68030.

- Bob Peters, Fermilab

Omega SANE backpatching!

I spent one entire Sunday to catch the bomb in this code:

(1) <if condition then>
(2)   <push a selector on stack>
(3) <else>
(4)   <push another selector on stack>
(5) _FP68K

On the first call Omega SANE analyzes the code and finds that (4) and (5) constitutes a “normal” SANE call. So, in the name of optimization, those 6 bytes are replaced in runtime by a direct JSR to the actual SANE routine. Imagine the spectacular view on a later occasion when (2) and (5) are executed!

- Sigmund Tveit, Norway

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Printopia 2.1.14 - Share Mac printers wi...
Run Printopia on your Mac to share its printers to any capable iPhone, iPad or iPod Touch. Printopia will also add virtual printers, allowing you to save print-outs to your Mac and send to apps.... Read more
Google Drive 1.24 - File backup and shar...
Google Drive is a place where you can create, share, collaborate, and keep all of your stuff. Whether you're working with a friend on a joint research project, planning a wedding with your fiancé, or... Read more
Chromium 45.0.2454.85 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 45.0.2454.85: Note: Does not contain the "... Read more
OmniFocus 2.2.5 - GTD task manager with...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more
iFFmpeg 5.7.1 - Convert multimedia files...
iFFmpeg is a graphical front-end for FFmpeg, a command-line tool used to convert multimedia files between formats. The command line instructions can be very hard to master/understand, so iFFmpeg does... Read more
VOX 2.6 - Music player that supports man...
VOX is a beautiful music player that supports many filetypes. The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features and support for all... Read more
Box Sync 4.0.6567 - Online synchronizati...
Box Sync gives you a hard-drive in the Cloud for online storage. Note: You must first sign up to use Box. What if the files you need are on your laptop -- but you're on the road with your iPhone? No... Read more
Carbon Copy Cloner 4.1.4 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
OmniGraffle Pro 6.3.1 - Create diagrams,...
OmniGraffle Pro helps you draw beautiful diagrams, family trees, flow charts, org charts, layouts, and (mathematically speaking) any other directed or non-directed graphs. We've had people use... Read more
Monosnap 3.1.2 - Versatile screenshot ut...
Monosnap lets you capture screenshots, share files, and record video and .gifs! Capture: Capture full screen, just part of the screen, or a selected window Make your crop area pixel perfect with... Read more

Goat Simulator MMO Simulator (Games)
Goat Simulator MMO Simulator 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICESiPhone 4S, iPad 2, iPod Touch 5 or better.** Coffee Stain Studios brings next-gen... | Read more »
Worms™ 4 (Games)
Worms™ 4 1.02 Device: iOS Universal Category: Games Price: $4.99, Version: 1.02 (iTunes) Description: The latest instalment in the worldwide mega hit franchise! Coming soon to iPhone, iPad and iPod touch. When the guys and girls at... | Read more »
The Deer God (Games)
The Deer God 1.0 Device: iOS Universal Category: Games Price: $6.99, Version: 1.0 (iTunes) Description: 30% off launch sale!!! “It can be a struggle, but it's all worth it when you're shooting fire out your antlers.” Kotaku “The... | Read more »
AppSpy's Patreon campaign kicks off
Occasionally you'll see us use AppSpy's videos here on 148Apps to support an article we've written. That's because we're part of Steel Media, and AppSpy is Steel's video arm, so we're all part of one happy family. [Read more] | Read more »
We're Sorry to Report that Moonrise...
Moonrise is a very promising-looking, Pokemon-esque monster collecting and battling game that we were really looking forward to reviewing, but unfortunately it looks like that's never going to happen. [Read more] | Read more »
The Latest Update for The Sims FreePlay...
Commerce has gotten a little more active with the newest update for The Sims FreePlay, making Sunset Mall more of a hangout than ever before. [Read more] | Read more »
This Week at 148Apps: August 24-28, 2015
The Apps of August With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out... | Read more »
NASCAR in Real Racing 3? Sure, Why Not?
I have to give Firemonkeys credit - it's very cool of them to add NASCAR to Real Racing 3 via an update rather than making a separate game for it. But that's a different discussion for another time; for now let's sit back and enjoy driving in... | Read more »
The nuyu is an Inexpensive Activity Moni...
Today, Health o Meter nuyu has announced a series of health and fitness-related products, including the aforementioned activity monitor along with a wireless scale. All at a decent pricepoint, no less. [Read more] | Read more »
The Makers of Overkill are Trying Someth...
Craneballs, the studio responsible for the Overkill series, is taking a little break from all that violence (a little break) to bring us Cube Worm - a 3D take on one of the most classic PC/calculator games in existence. [Read more] | Read more »

Price Scanner via MacPrices.net

Will You Buy An iPad Pro? – The ‘Book Mystiqu...
It looks like we may not have to wait much longer to see what finally materializes as a new, larger-panel iPad (Pro/Plus?) Usually reliable Apple product prognosticator KGI Securities analyst Ming-... Read more
eFileCabinet Announces SMB Document Managemen...
Electronic document management (EDM) eFileCabinet, Inc., a hosted solutions provider for small to medium businesses, has announced that its SecureDrawer and eFileCabinet Online services will be... Read more
WaterField Designs Unveils American-Made, All...
San Francisco’s WaterField Designs today unveiled their all-leather Cozmo 2.0 — an elegant attach laptop bag with carefully-designed features to suit any business environment. The Cozmo 2.0 is... Read more
Apple’s 2015 Back to School promotion: Free B...
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
128GB MacBook Airs on sale for $100 off MSRP,...
B&H Photo has 11″ & 13″ MacBook Airs with 128GB SSDs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air: $799.99, $100 off MSRP... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
27-inch 3.2GHz iMac on sale for $1679, save $...
B&H Photo has the 27″ 3.2GHz iMac on sale for $1679.99 including free shipping plus NY sales tax only. Their price is $120 off MSRP. Read more
Apple and Cisco Partner to Deliver Fast-Lane...
Apple and Cisco have announced a partnership to create a “fast lane” for iOS business users by optimizing Cisco networks for iOS devices and apps. The alliance integrates iPhone with Cisco enterprise... Read more
Apple offering refurbished 2015 13-inch Retin...
The Apple Store is offering Apple Certified Refurbished 2015 13″ Retina MacBook Pros for up to $270 (15%) off the cost of new models. An Apple one-year warranty is included with each model, and... Read more
Apple refurbished 2015 MacBook Airs available...
The Apple Store has Apple Certified Refurbished 2015 11″ and 13″ MacBook Airs (the latest models), available for up to $180 off the cost of new models. An Apple one-year warranty is included with... Read more

Jobs Board

Simply Mac *Apple* Specialist- Repair Techn...
Simply Mac is the greatest premier retailer of Apple products expertise in North America. We're looking for dedicated individuals to provide personalized service and Read more
Simply Mac *Apple* Specialist- Service Repa...
Simply Mac is the greatest premier retailer of Apple products expertise in North America. We're looking for dedicated individuals to provide personalized service and Read more
*Apple* Desktop Analyst - KDS Staffing (Unit...
…field and consistent professional recruiting achievement. Job Description: Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Read more
Simply Mac- *Apple* Specialist- Store Manag...
Simply Mac is the largest premier retailer for Apple products and solutions. We're looking for dedicated individuals with a passion to simplify and enhance the Read more
*Apple* Evangelist - JAMF Software (United S...
The Apple Evangelist is responsible for building and cultivating strategic relationships with Apple 's small and mid-market business development field teams. This Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.