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

ScreenFlow 8.2.5 - Create screen recordi...
ScreenFlow is powerful, easy-to-use screencasting software for the Mac. With ScreenFlow you can record the contents of your entire monitor while also capturing your video camera, microphone and your... Read more
MegaSeg 6.1.1 - Professional DJ and radi...
MegaSeg is a complete solution for pro audio/video DJ mixing, radio automation, and music scheduling with rock-solid performance and an easy-to-use design. Mix with visual waveforms and Magic... Read more
Beamer 3.4 - Stream any movie file from...
Beamer streams to your Apple TV or Chromecast. Plays any movie file - Just like the popular desktop movie players, Beamer accepts all common formats, codecs and resolutions. AVI, MKV, MOV, MP4, WMV... Read more
FotoMagico 5.6.12 - Powerful slideshow c...
FotoMagico lets you create professional slideshows from your photos and music with just a few, simple mouse clicks. It sports a very clean and intuitive yet powerful user interface. High image... Read more
OmniGraffle Pro 7.12.1 - 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
beaTunes 5.2.1 - Organize your music col...
beaTunes is a full-featured music player and organizational tool for music collections. How well organized is your music library? Are your artists always spelled the same way? Any R.E.M. vs REM?... Read more
HandBrake 1.3.0 - Versatile video encode...
HandBrake is a tool for converting video from nearly any format to a selection of modern, widely supported codecs. Features Supported Sources VIDEO_TS folder, DVD image or real DVD (unencrypted... Read more
Macs Fan Control 1.5.1.6 - Monitor and c...
Macs Fan Control allows you to monitor and control almost any aspect of your computer's fans, with support for controlling fan speed, temperature sensors pane, menu-bar icon, and autostart with... Read more
TunnelBear 3.9.3 - Subscription-based pr...
TunnelBear is a subscription-based virtual private network (VPN) service and companion app, enabling you to browse the internet privately and securely. Features Browse privately - Secure your data... Read more
calibre 4.3.0 - Complete e-book library...
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 librarian... Read more

Latest Forum Discussions

See All

The House of Da Vinci 2 gets a new gamep...
The House of Da Vinci launched all the way back in 2017. Now, developer Blue Brain Games is gearing up to deliver a second dose of The Room-inspired puzzling. Some fresh details have now emerged, alongside the game's first official trailer. [Read... | Read more »
Shoot 'em up action awaits in Battl...
BattleBrew Productions has just introduced another entry into its award winning, barrelpunk inspired, BattleSky Brigade series. Whilst its previous title BattleSky Brigade TapTap provided fans with idle town building gameplay, this time the... | Read more »
Arcade classic R-Type Dimensions EX blas...
If you're a long time fan of shmups and have been looking for something to play lately, Tozai Games may have just released an ideal game for you on iOS. R-Type Dimensions EX brings the first R-Type and its sequel to iOS devices. [Read more] | Read more »
Intense VR first-person shooter Colonicl...
Our latest VR obsession is Colonicle, an intense VR FPS, recently released on Oculus and Google Play, courtesy of From Fake Eyes and Goboogie Games. It's a pulse-pounding multiplayer shooter which should appeal to genre fanatics and newcomers alike... | Read more »
PUBG Mobile's incoming update bring...
PUGB Mobile's newest Royale Pass season they're calling Fury of the Wasteland arrives tomorrow and with it comes a fair chunk of new content to the game. We'll be seeing a new map, weapon and even a companion system. [Read more] | Read more »
PSA: Download Bastion for free, but wait...
There hasn’t been much news from Supergiant Games on mobile lately regarding new games, but there’s something going on with their first game. Bastion released on the App Store in 2012, and back then it was published by Warner Bros. This Warner... | Read more »
Apple Arcade: Ranked - 51+ [Updated 11.5...
This is Part 2 of our Apple Arcade Ranking list. To see part 1, go here. 51. Patterned [Read more] | Read more »
NABOKI is a blissful puzzler from acclai...
Acclaimed developer Rainbow Train's latest game, NABOKI, is set to launch for iOS, Android, and Steam on November 13th. It's a blissful puzzler all about taking levels apart in interesting, inventive ways. [Read more] | Read more »
A Case of Distrust is a narrative-driven...
A Case of Distrust a narrative-focused mystery game that's set in the roaring 20s. In it, you play as a detective with one of the most private eye sounding names ever – Phyllis Cadence Malone. You'll follow her journey in San Francisco as she... | Read more »
Brown Dust’s October update offers playe...
October is turning out to be a productive month for the Neowiz team, and a fantastic month to be a Brown Dust player. First, there was a crossover event with the popular manga That Time I Got Reincarnated as a Slime. Then, there was the addition of... | Read more »

Price Scanner via MacPrices.net

Score a 37% discount on Apple Smart Keyboards...
Amazon has Apple Smart Keyboards for current-generation 10″ iPad Airs and previous-generation 10″ iPad Pros on sale today for $99.99 shipped. That’s a 37% discount over Apple’s regular MSRP of $159... Read more
Apple has refurbished 2019 13″ 1.4GHz MacBook...
Apple has a full line of Certified Refurbished 2019 13″ 1.4GHz 4-Core Touch Bar MacBook Pros available starting at $1099 and up to $230 off MSRP. Apple’s one-year warranty is included, shipping is... Read more
2019 13″ 1.4GHz 4-Core MacBook Pros on sale f...
Amazon has new 2019 13″ 1.4GHz 4-Core Touch Bar MacBook Pros on sale for $150-$200 off Apple’s MSRP. These are the same MacBook Pros sold by Apple in its retail and online stores: – 2019 13″ 1.4GHz/... Read more
11″ 64GB Gray WiFi iPad Pro on sale for $674,...
Amazon has the 11″ 64GB Gray WiFi iPad Pro on sale today for $674 shipped. Their price is $125 off MSRP for this iPad, and it’s the lowest price available for the 64GB model from any Apple reseller. Read more
2019 15″ MacBook Pros available for up to $42...
Apple has a full line of 2019 15″ 6-Core and 8-Core Touch Bar MacBook Pros, Certified Refurbished, available for up to $420 off the cost of new models. Each model features a new outer case, shipping... Read more
2019 15″ MacBook Pros on sale this week for $...
Apple resellers B&H Photo and Amazon are offering the new 2019 15″ MacBook Pros for up to $300 off Apple’s MSRP including free shipping. These are the same MacBook Pros sold by Apple in its... Read more
Sunday Sale: AirPods with Wireless Charging C...
B&H Photo has Apple AirPods with Wireless Charging Case on sale for $159.99 through 11:59pm ET on November 11th. Their price is $40 off Apple’s MSRP, and it’s the lowest price available for these... Read more
Details of Sams Club November 9th one day App...
Through midnight Saturday night (November 9th), Sams Club online has several Apple products on sale as part of their One Day sales event. Choose free shipping or free local store pickup (if available... Read more
Sprint is offering the 64GB Apple iPhone 11 f...
Sprint has the new 64GB iPhone 11 available for $15 per month for new lines. That’s about 50% off their standard monthly lease of $29.17. Over is valid until November 24, 2019. The fine print: “Lease... Read more
New Sprint November iPhone deal: Lease one iP...
Switch to Sprint and purchase an Apple iPhone 11, 11 Pro, or 11 Pro Max, and get a second 64GB iPhone 11 for free. Requires 2 new lines or 1 upgrade-eligible line and 1 new line. Offer is valid from... Read more

Jobs Board

*Apple* Mobility Pro - Best Buy (United Stat...
**746087BR** **Job Title:** Apple Mobility Pro **Job Category:** Store Associates **Store NUmber or Department:** 000319-Harlem & Irving-Store **Job Description:** Read more
Best Buy *Apple* Computing Master - Best Bu...
**743392BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Store Associates **Store NUmber or Department:** 001171-Southglenn-Store **Job Read more
Best Buy *Apple* Computing Master - Best Bu...
**746015BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Sales **Store NUmber or Department:** 000372-Federal Way-Store **Job Description:** Read more
*Apple* Mobility Pro - Best Buy (United Stat...
**744658BR** **Job Title:** Apple Mobility Pro **Job Category:** Store Associates **Store NUmber or Department:** 000586-South Hills-Store **Job Description:** At Read more
Best Buy *Apple* Computing Master - Best Bu...
**741552BR** **Job Title:** Best Buy Apple Computing Master **Job Category:** Sales **Store NUmber or Department:** 000277-Metcalf-Store **Job Description:** **What Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.