TweetFollow Us on Twitter

May 93 Tips, Tidbits
Volume Number:9
Issue Number:5
Column Tag:Tips & Tidbits

Related Info: Quickdraw Color Quickdraw

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

DebugFStr and DebugFsStr are C macros that enable developers to drop into a low-level debugger, such as MacsBug or TMON, and display the contents of variables in a formatted manner. One example would be to display a long in hex, decimal or octal notation. Better yet, several variables can be shown together on the same message line that is displayed by a debugger. These macros can be used by both Think C and MPW C. Here's how to use 'em (Think C users):

Add the DebugFStr or DebugFsStr macro to your code. To use either macro, include the ANSI (or ANSI-small) and the MacTraps libraries in your project. You must also include the "stdio.h" header file in any source file in which you intend to use these macros. Don't forget to define 'AND' because it is necessary for the syntax of both macros. Macro definitions:

/* 1 */
#define DebugFStr(x,y,z)  sprintf((char *)x,(char *)y,z);      
 \
 c2pstr((char *)x);\
 DebugStr(x);
#define DebugFsStr(x,y) { Str255 a_temporary_string = "\0";    
 \
 sprintf((char *)a_temporary_string,(char *)x,y);\
 c2pstr((char *)a_temporary_string); \
 DebugStr(a_temporary_string);}
#define AND ,

Place DebugFStr or DebugFsStr calls throughout your code in places where you want to drop into your low-level debugger and view the contents of variables. The syntax for using each macro is:

/* 2 */

DebugFStr((char *)resultString,(const char *)formatString,var1 AND var2 
AND varN)
DebugFsStr((const char *)formatString,var1 AND var2 AND   varN)

When using DebugFStr, you must declare and pass a string variable that will be used by the macro to hold the resulting formatted string. This string is a Str255.

FormatString should be a C string constant, enclosed in double-quotes, and can contain formatting information that is identical to the formatting information used for ANSI C's sprintf function.

The variables var1 through varN must be separated by the word AND and the variables must be ordered to correspond directly to the order of the variables defined in the formatString. See the Think C Standard Libraries Reference guide for more information about the sprintf function.

NOTE: The combined length of the formatString and the formatted variables cannot exceed 255 characters, because both macros call DebugStr which requires a Pascal-style string.

NOTE: Notice in the syntax for both macros that neither is delimited by a semicolon.

The only real difference between DebugFStr and DebugFsStr is that the DebugFsStr macro creates a temporary string variable for the formatted string result and DebugFStr requires you to supply a string which will be used by the macro to store the formatted string result.

Following is a function that demonstrates the use of DebugFStr.

/* 3 */

static void MyFunc(short dummy)
{
 long    tempL1 = 1000;
 long    tempL2 = 20;
 Str255  result;

 DebugFStr((char *)result,"In HEX, tempL1 is %#lX and tempL2 is %#lX.",
 tempL1 AND tempL2)
 tempL1 += tempL2;
 DebugFStr((char *)result,"In decimal, tempL1 is %ld.",templL1) }

In the sample function shown above, MyFunc would drop into your debugger two times. On the first drop, your debugger would display the message: In Hex, tempL1 is 0X3E8 and tempL2 is 0X14. On the second drop, your debugger would display the message: In decimal, tempL1 is 1020.

- Jerry Panagrossi

Int'l Biotech via AppleLink

Adding Touch to MPW

If you work much with makefiles, you may sometimes want an easy way to touch a file's modification date. MPW doesn't include a touch command, but it's easy to add one. Type this command into the MPW Worksheet and press Enter:

 Alias Touch "Setfile -m . "

With this alias, you can touch the last modification date of files by entering commands like "touch filename" (updates just the one filename) or "touch .f" (all files in current folder with names ending in ".f").

After you've tried this and decided it's something you'd like as a permanent feature in MPW, copy the above Alias command to your UserStartup file. That way it will be executed each time you launch MPW.

- Lee D. Rimar

Rochester Hills, MI

Subtle QuickDraw Change

If you are writing code that bypasses QuickDraw and writes directly to the screen, and your code is running under 32-bit QuickDraw, only mask off the upper two bits of the screen’s rowbytes value. Previous to 32-bit QuickDraw, the maximum value for rowbytes was $1FFE (bits 13-15 reserved for flags), but with 32-bit QuickDraw, the maximum restriction has been raised to $3FFE (only bits 14 & 15 are reserved).

In most situations, an application that does its own blits to the screen would not encounter any problems masking off bit 13 BUT the time has arrived where bit 13 is being used. For example, a screen of 2048 32-bit pixels requires a rowbytes value of $2000. Applications that mask off bit 13 will produce a rowbytes value of zero, and will wind up drawing only to the top line of the screen.

By the way, if you did overlook this subtle change to the pixmap structure in Inside Mac IV (Chapter 17, page 5), don't feel left out, as I've found popular commercial applications making the same mistake as well.

- John C. Signa

SuperMac Technology

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Ember 1.8.3 - Versatile digital scrapboo...
Ember (formerly LittleSnapper) is your digital scrapbook of things that inspire you: websites, photos, apps or other things. Just drag in images that you want to keep, organize them into relevant... Read more
Apple iTunes 12.1 - Manage your music, m...
Apple iTunes lets you organize and play digital music and video on your computer. It can automatically download new music, app, and book purchases across all your devices and computers. And it's a... Read more
LibreOffice 4.4.3 - Free, open-source of...
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
FoldersSynchronizer 4.2.1 - Synchronize...
FoldersSynchronizer is a popular and useful utility that synchronizes and backs-up files, folders, disks and boot disks. On each session you can apply special options like Timers, Multiple Folders,... Read more
Simon 4.0.2 - Monitor changes and crashe...
Simon monitors websites and alerts you of crashes and changes. Select pages to monitor, choose your alert options, and customize your settings. Simon does the rest. Keep a watchful eye on your... Read more
Cocktail 8.1.2 - General maintenance and...
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
Cyberduck 4.6.4 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Herald 5.0.2 - Notification plugin for M...
Note: Versions 2.1.3 (for OS X 10.7), 3.0.6 (for OS X 10.8), and 4.0.8 (for OS X 10.9) are no longer supported by the developer. Herald is a notification plugin for Mail.app, Apple's Mac OS X email... Read more
DEVONthink Pro 2.8.3 - Knowledge base, i...
Save 10% with our exclusive coupon code: MACUPDATE10 DEVONthink Pro is your essential assistant for today's world, where almost everything is digital. From shopping receipts to important research... Read more
Boom 2 1.0.1 - System-wide pro audio app...
Boom 2 is a system-wide volume booster and equalizer app that is designed especially for OS X 10.10 Yosemite. It comes with a smart interface, self-calibrates itself according to your Mac, offers... Read more

Playworld Superheroes Review
Playworld Superheroes Review By Tre Lawrence on January 30th, 2015 Our Rating: :: HERO CRAFTINGUniversal App - Designed for iPhone and iPad It’s all about the imagination, fighting bad creatures — and looking good while doing so.   | Read more »
Join the SpongeBob Bubble Party in this...
Join the SpongeBob Bubble Party in this New Match 3 Bubble Poppin’ Frenzy Posted by Jessica Fisher on January 30th, 2015 [ permalink ] | Read more »
Handpick Review
Handpick Review By Jennifer Allen on January 30th, 2015 Our Rating: :: TANTALIZING SUGGESTIONSiPhone App - Designed for the iPhone, compatible with the iPad Handpick will make you hungry, as well as inspire you to cook something... | Read more »
Storm the Halls of Echo Base in First St...
Storm the Halls of Echo Base in First Star Wars: Galactic Defense Event Posted by Jessica Fisher on January 30th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Contradiction Review
Contradiction Review By Tre Lawrence on January 30th, 2015 Our Rating: :: SPOT THE LIEiPad Only App - Designed for the iPad Contradiction is a live action point and click adventure that’s pretty engaging.   Developer: Tim Follin... | Read more »
Unlock Sunshine Girl in Ironkill with th...
Unlock Sunshine Girl in Ironkill with this special 148Apps code Posted by Rob Rich on January 29th, 2015 [ permalink ] Robo-fighter Ironkill has been out on iOS a | Read more »
Crossroad Zombies Review
Crossroad Zombies Review By Jordan Minor on January 29th, 2015 Our Rating: :: CROSSWALKING DEADiPad Only App - Designed for the iPad Crossroad Zombies is a rough draft of a cool genre mash-up.   | Read more »
Blood Brothers 2 – Tips, Cheats, and Str...
War is hell: Is it the kind of hell you want to check out? Read our Blood Brothers 2 review to find out! Blood Brothers 2, DeNA’s follow-up to the original Blood Brothers, is an intriguing card collecting / role-playing / strategy hybrid. There’s... | Read more »
Blood Brothers 2 Review
Blood Brothers 2 Review By Nadia Oxford on January 29th, 2015 Our Rating: :: AN AGGRAVATING RELATIVEUniversal App - Designed for iPhone and iPad Blood Brothers 2 is built on a simple, solid foundation, but its free-to-play system... | Read more »
I AM BREAD, the Toast of the Town, is Ro...
Have you ever dreamt of being deliciously gluten-y? Do you feel passionate about Rye and Wheat? The guys at Bossa Studios do and that is why they are bringing I AM BREAD to iOS soon. The loafy app will feature all the new content that is being... | Read more »

Price Scanner via MacPrices.net

Apple Becomes World’s Largest Smartphone Vend...
According to the latest research data from Strategy Analytics, as global smartphone shipments grew 31 percent annually to reach a record 380 million units in the fourth quarter of 2014. Apple became... Read more
Cut the Cord: OtterBox Resurgence Power Case...
Dead batteries and broken phones are two of the biggest issues for smartphone users today. Otterbox addresses both with the new Resurgence Power Case for Apple iPhone 6, promising to make those panic... Read more
13-inch Retina MacBook Pros on sale for up to...
B&H Photo has 13″ Retina MacBook Pros on sale for $200 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.6GHz/128GB Retina MacBook Pro: $1199.99 save $100 - 13″ 2.6GHz/... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
 B&H Photo has the 15″ 2.5GHz Retina MacBook Pro on sale for $2319.99 including free shipping plus NY sales tax only. Their price is $180 off MSRP, and it’s the lowest price available for this... Read more
Back in stock: Refurbished iPod nanos for $99...
The Apple Store has Apple Certified Refurbished 16GB iPod nanos available for $99 including free shipping and Apple’s standard one-year warranty. That’s $50 off the cost of new nanos. Most colors are... Read more
Apple lowers price on refurbished 256GB MacBo...
The Apple Store has lowered prices on Apple Certified Refurbished 2014 MacBook Airs with 256GB SSDs, now available for up to $200 off the cost of new models. An Apple one-year warranty is included... Read more
New Good Management Suite Simplifies Enterpri...
Good Technology has announced the availability of the Good Management Suite, a comprehensive cross-platform solution for organizations getting started with mobile business initiatives. Built on the... Read more
15-inch 2.0GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished previous-generation 15″ 2.0GHz Retina MacBook Pros available for $1489 including free shipping plus Apple’s standard one-year warranty. Their price is... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
Amazon has the 15″ 2.5GHz Retina MacBook Pro on sale for $2319.99 including free shipping. Their price is $180 off MSRP, and it’s the lowest price available for this model from any reseller. Read more
iPad Turns Five – The ”Book Mystique
Five years ago this week, the late Steve Jobs took the stage at an Apple special press event to unveil the first Apple iPad — a slab-shaped, hand-holdable device that was to shake the personal... Read more

Jobs Board

At-Home Chat Specialist- *Apple* Online Stor...
**Job Summary** At Apple , we believe in hard work, a fun environment, and the kind of creativity and innovation that only comes about when talented people from diverse Read more
SW QA Engineer - *Apple* TV - Apple (United...
**Job Summary** The Apple TV team is looking for experienced Quality Assurance Engineers with a passion for delivering first in class home entertainment solutions. **Key Read more
*Apple* Retail - Multiple Positions(US) - Ap...
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* Systems Engineer - Pre Sales, Educat...
…is responsible for proactively providing technical expertise to drive sales of Apple solutions into assigned accounts. The SE architects, validates, and assists in Read more
*Apple* Solutions Consultant - Retail Sales...
As an ambassador of the Apple brand, the ASC is accountable for driving sales performance by: Connecting with customers. Discovering customers' needs and values. Showing Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.