TweetFollow Us on Twitter

Jun 93 Tidbits
Volume Number:9
Issue Number:6
Column Tag:Tips & Tidbits

Tips & Tidbits

By Neil Ticktin, Editor-in-Chief

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.

MacTech Magazine will pay $25 for every tip used, and $50 for the Tip of the Month. Or you can take your award in orders or subscriptions.

To submit a tip, send in a letter to the magazine. E-mail is our preferred method, but feel free to send something via the US Mail. See page two for all addresses. 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.

Tip of the month

Ira Ruben has written a useful code disassembler for ResEdit. However, it has drawbacks - in particular, it’s not very intelligent about handling data interspersed with the code (such as embedded string literals). Also, you can’t invoke it on just any resource type: if you come across a new type of code-containing resource (such as those “AINI” resources that System 7 uses), you have to modify ResEdit to be able to disassemble the new resource type.

MacsBug has much nicer disassembly facilities, and you can dump out different bits of memory using different formats if you choose. Wouldn’t it be nice if you could use these facilities on resources you were examining with ResEdit? Well, you can!

First of all, open the resource you want to examine with ResEdit. Make sure the resource is open for editing in a window (using any available editor - even the hex editor). Now, hold down the mouse button over ResEdit’s menu bar (an unused portion is best), and with your other hand, hit the interrupt button (or keyboard interrupt sequence) to get into MacsBug. Once you’re in MacsBug, you can let go of the mouse button.

Check the CurApName on the left of MacsBug’s display, to make sure you’re in ResEdit (it will be in the middle of calling MenuSelect). Now type

hd AINI

(replace “AINI” with whatever the type of the resource is that you want to examine). You will get a list of all resources of that type in the current heap zone, along with their starting addresses, lengths, resource IDs and names, and the refnum of the file they come from. Look for the one with the right ID or name. If you want to make sure you’ve got the right one, you can also use the command

file <refnum>

(replacing “<refnum>” with whatever the file refnum is for that resource) to make sure that the resource comes from the right file. Now you’re free to use commands like il and dm to examine bits of that resource.

If you’re making patches to code, you can use MacsBug’s dh command to check that you’ve got the right instruction words before making the modifications. Also, if you make any changes to a resource in ResEdit’s hex editor, you can go into MacsBug and disassemble that resource, and examine the effects of your changes immediately, before you save them.

- Lawrence D’Oliveiro

University of Waikato

Hamilton, New Zealand

MPW as a “Real” Language

I though that I would write in on “How MPW scripts can perform tasks that might otherwise require you to code in a "real" computer language”. In the past few years, I've had to answer many users' questions on MPW, and I've accumulated a supply of interesting scripts and techniques. As an example, I could have answered Mike Scanlin's March Programmers' Challenge (count unique words) with this script:

Evaluate 
`Begin ; 
  Catenate 
  `GetFilename -t TEXT -b Count -m "UNIQUE WORD COUNT"` ; 
  Echo ; 
 End | 
Translate "A-Z ,." a-zn | 
Sort -unique | 
Count -l` - 1

Obviously, this entry doesn’t qualify because it is not in C, but it is yet another demonstration of MPW's power.

- Lee D. Rimar, Absoft

Source and Line info

After reading the tip of the month in the May issue, I thought others might like to see what I use for debug formatting. It has the same benefits as the DebugFStr routine (i.e., formatted output), but adds automatic source file and line number information to the debug output. Using the routine is identical to using printf, except it is now called dprintf. The dprintf routine itself is actually a macro that invokes one routine to store the caller's file name and line number, then calls the actual output routine.

To use dprintf, include dprintf.h in any files that use it, and make sure you've added ANSI or ANSI-small to your project. Call it anywhere just like you'd call printf.

/*-------- dprintf.h ---------*/

#define dprintf  dprintf_setup(__FILE__,__LINE__), dprintf_output

extern int dprintf_setup(const char *file, int line);
extern int dprintf_output(const char *fmt, ...);

/*-------- dprintf.c ---------*/

#include <stdarg.h>
#include <stdio.h>
#include "dprintf.h"

static int d_line;
static char d_file[32];

int
dprintf_setup(const char *file, int line)
{
 d_line = line;
 strncpy(d_file, file, sizeof(d_file));
 d_file[sizeof(d_file)-1] = 0;
 return 0;
}

int
dprintf_output(const char *fmt, ...)
{
 va_list ap;
 Str255 buf;
 
 sprintf(buf, "%s %d: ", d_file, d_line);
 va_start(ap, fmt);
 vsprintf(buf + strlen(buf), fmt, ap);
 va_end(ap);
 CtoPstr(buf);
 DebugStr(buf);
 return 0;
}

- Mark Nagel

Irvine, CA

System 7 FindFolder

There is a neat little function in System 7 called FindFolder(). It lets you find important system folders with little effort. I used it to find the preferences folder into which I placed my own folder. This worked fine under MacOS. I had a nice little combination of FindFolder(), FSOpen() and Create() calls. The problem begins with the A/UX way of seeing directories. These are more like Unix than Apple folders.

A/UX preferences folder = /mac/sys/System Folder/Preferences
Mac preferences folder = System Folder:Preferences

The A/UX path as presented is what FindFolder() returns. Unfortunately this does not work as a path for older Mac function calls. All the PB, PBH and other pre-System 7 calls do not understand this. to use this format directly you need to do either a) or b):

a) Use the FSSpec type of calls everywhere, which works very well after you get used to them; or b) Convert all your paths to the following:

A/UX FindFolder() gives:

/mac/sys/System Folder/Preferences

You need:

/:mac:sys:System Folder:Preferences

The key here being the '/:' at the beginning.

- CHUS-FAMUS

[Remember to keep them cards and letters coming. The more entries, the better the entries. - Ed.]

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Rodeo Stampede guide to running a better...
In Rodeo Stampede, honing your skills so you can jump from animal to animal and outrun the herd as long as possible is only half the fun. Once you've tamed a few animals, you can bring them home with you. [Read more] | Read more »
VoxSyn (Music)
VoxSyn 1.0 Device: iOS Universal Category: Music Price: $6.99, Version: 1.0 (iTunes) Description: VoxSyn turns your voice into the most flexible vocal sound generator ever. Instantly following even subtle modulations of pitch and... | Read more »
Catch Battleplans on Google Play from Ju...
Real-time strategy title Battleplans is due for release on Google Play on June 30th, following its release for iOS systems last month. With its simple interface and pretty graphics, the crowd-pleaser brings a formerly overlooked genre out for the... | Read more »
iDoyle: The interactive Adventures of Sh...
iDoyle: The interactive Adventures of Sherlock Holmes - A Scandal in Bohemia 1.0 Device: iOS Universal Category: Books Price: $1.99, Version: 1.0 (iTunes) Description: Special Release Price $1.99 (Normally $3.99) | Read more »
Five popular free apps to help you slim...
Thanks to retail and advertising, we're used to thinking one season ahead. Here we are just a week into the summer and we're conditioned to start thinking about the fall. [Read more] | Read more »
How to ride longer and tame more animals...
It's hard to accurately describe Rodeo Stampede to people who haven't seen it yet. It's like if someone took Crossy Roadand Disco Zoo and put them in a blender, yet with a unique game mechanic that's still simple and fun for anyone. [Read more] | Read more »
Teeny Titans - A Teen Titans Go! Figure...
Teeny Titans - A Teen Titans Go! Figure Battling Game 1.0.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.0 (iTunes) Description: Teeny Titans, GO! Join Robin for a figure battling RPG of epic proportions! TEENY... | Read more »
NinjAwesome: Tips and tricks to be a mor...
Sorry about that headline, but I'm going to go ahead and assume that GameResort would not have named its game NinjAwesome without expecting some of that. It is, in fact, pretty awesome the way it combines an endless runner and old school arcade... | Read more »
Into Mirror (Games)
Into Mirror 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: "Is all that we see or seem, but a dream within a dream?"- Edgar Allan Poe New game by Lemon Jam Studio, the team behind Pursuit... | Read more »
Perchang (Games)
Perchang 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Welcome to Perchang! A test of skill and puzzle solving across 60 stunning levels. | Read more »

Price Scanner via MacPrices.net

15-inch Retina MacBook Pros on sale for $200-...
B&H Photo has 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799.99 $200 off MSRP - 15″ 2.5GHz... Read more
Mac minis on sale for up to $100 off MSRP
B&H Photo has Mac minis on sale for up to $100 off MSRP including free shipping plus NY sales tax only: - 1.4GHz Mac mini: $449 $50 off MSRP - 2.6GHz Mac mini: $649 $50 off MSRP - 2.8GHz Mac mini... Read more
Clearance 2015 13-inch MacBook Airs available...
B&H Photo has clearance 2015 13″ MacBook Airs available for $300 off original MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/4GB/128GB MacBook Air (MJVE2LL/A): $799.... Read more
Apple refurbished Mac minis available for up...
Apple has Certified Refurbished Mac minis available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz Mac mini: $419 $80 off MSRP - 2.6GHz Mac... Read more
ABBYY TextGrabber: 1,000,000 Installs in 5 Da...
ABBYY, an international OCR technologies provider, has announced that their image-to-text application TextGrabber, got installed 1,000,000 times in just five days while being featured by the App... Read more
New SkinIt Waterproof Case For iPhone 6
With its impact and waterproof design, the Skinit Waterproof case provides security and protection to guarantee your phone will get you through even the most demanding outdoor conditions. The impact-... Read more
iMacs on sale for up to $150 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $150 off MSRP including free shipping plus NY sales tax only: - 27″ 3.3GHz iMac 5K: $2181.11 $118 off MSRP - 27″ 3.2GHz/1TB Fusion iMac 5K: $1949... Read more
12-inch 1.1GHz Retina MacBooks on sale for $5...
B&H Photo has 2016 12″ 1.1GHz/256GB Retina MacBooks on sale for up to $50 off MSRP. Shipping is free, and B&H charges NY tax only: - 12″ 1.1GHz Space Gray Retina MacBook: $1249 $50 off MSRP... Read more
WWDC Announcements Revisited Still Underwhelm...
I was disappointed that no new MacBook hardware was announced at this year’s all-software World Wide Developer’s Conference. Not even a hint about what’s in the development pipeline. Of course, we... Read more
Twelve South Compass 2 iPad Stand Now Availab...
Twelve South has updated its most popular iPad stand, Compass 2, with the introduction of two new colors — Gold and Rose Gold. These new color options n perfectly complement the new Rose Gold iPad... Read more

Jobs Board

*Apple* New Products Testers Needed - Apple...
…we therefore look forward to put out products to quality test for durability. Apple leads the digital music revolution with its iPods and iTunes online store, Read more
*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you 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* Retail - Multiple Positions, Towson...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Professional Learning Specialist - A...
Job Summary The Apple Professional Learning Specialist is a full-time position for one year with Apple in the Phoenix, AZ area. This position requires a high Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.