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

OS X Server 4.1.3 - For OS X 10.10 Yosem...
Designed for OS X and iOS devices, OS X Server makes it easy to share files, schedule meetings, synchronize contacts, develop software, host your own website, publish wikis, configure Mac, iPhone,... Read more
pwSafe 4.1 - Secure password management...
pwSafe provides simple and secure password management across devices and computers. pwSafe uses iCloud to keep your password databases backed-up and synced between Macs and iOS devices. It is... Read more
Kodi 15.0.rc1 - Powerful media center to...
Kodi (was XBMC) is an award-winning free and open-source (GPL) software media player and entertainment hub that can be installed on Linux, OS X, Windows, iOS, and Android, featuring a 10-foot user... Read more
Coda 2.5.11 - One-window Web development...
Coda is a powerful Web editor that puts everything in one place. An editor. Terminal. CSS. Files. With Coda 2, we went beyond expectations. With loads of new, much-requested features, a few surprises... Read more
Bookends 12.5.7 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Access the power of Bookends directly from Mellel, Nisus Writer Pro, or MS Word (... Read more
Maya 2016 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
RapidWeaver 6.2.3 - Create template-base...
RapidWeaver is a next-generation Web design application to help you easily create professional-looking Web sites in minutes. No knowledge of complex code is required, RapidWeaver will take care of... Read more
MacFamilyTree 7.5.2 - Create and explore...
MacFamilyTree gives genealogy a facelift: it's modern, interactive, incredibly fast, and easy to use. We're convinced that generations of chroniclers would have loved to trade in their genealogy... Read more
Paragraphs 1.0.1 - Writing tool just for...
Paragraphs is an app just for writers. It was built for one thing and one thing only: writing. It gives you everything you need to create brilliant prose and does away with the rest. Everything in... Read more
BlueStacks App Player 0.9.21 - Run Andro...
BlueStacks App Player lets you run your Android apps fast and fullscreen on your Mac. Version 0.9.21: Note: Now requires OS X 10.8 or later running on a 64-bit Intel processor. Initial stable... Read more

Rage of Bahamut is Giving Almost All of...
The App Store isn't what it used to be back in 2012, so it's not unexpected to see some games changing their structures with the times. Now we can add Rage of Bahamut to that list with the recent announcement that the game is severely cutting back... | Read more »
Adventures of Pip (Games)
Adventures of Pip 1.0 Device: iOS iPhone Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ** ONE WEEK ONLY — 66% OFF! *** “Adventures of Pip is a delightful little platformer full of charm, challenge and impeccable... | Read more »
Divide By Sheep - Tips, Tricks, and Stre...
Who would have thought splitting up sheep could be so involved? Anyone who’s played Divide by Sheep, that’s who! While we’re not about to give you complete solutions to everything (because that’s just cheating), we will happily give you some... | Read more »
NaturalMotion and Zynga Have Started Tea...
An official sequel to 2012's CSR Racing is officially on the way, with Zynga and NaturalMotion releasing a short teaser trailer to get everyone excited. Well, as excited as one can get from a trailer with no gameplay footage, anyway. [Read more] | Read more »
Grab a Friend and Pick up Overkill 3, Be...
Overkill 3 is a pretty enjoyable third-person shooter that was sort of begging for some online multiplayer. Fortunately the begging can stop, because its newest update has added an online co-op mode. [Read more] | Read more »
Scanner Pro's Newest Update Adds Au...
Scanner Pro is one of the most popular document scanning apps on iOS, thanks in no small part to its near-constant updates, I'm sure. Now we're up to update number six, and it adds some pretty handy new features. [Read more] | Read more »
Heroki (Games)
Heroki 1.0 Device: iOS Universal Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: CLEAR THE SKIES FOR A NEW HERO!The peaceful sky village of Levantia is in danger! The dastardly Dr. N. Forchin and his accomplice,... | Read more »
Wars of the Roses (Games)
Wars of the Roses 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: | Read more »
TapMon Battle (Games)
TapMon Battle 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: It's time to battle!Tap! Tap! Tap! Try tap a egg to hatch a Tapmon!Do a battle with another tapmons using your hatched tapmons! *... | Read more »
Alchemic Dungeons (Games)
Alchemic Dungeons 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: ### Release Event! ### 2.99$->0.99$ for limited time! ### Roguelike Role Playing Game! ### Alchemic Dungeons is roguelike... | Read more »

Price Scanner via MacPrices.net

Seagate Backup Plus Drives Feature 200GB of C...
Seagate Technology plc has announced that its Backup Plus family of external storage offerings will now include 200GB of OneDrive cloud storage, a major added value, and the addition of Lyve’s photo... Read more
Canon PIXMA MG3620 Wireless Inkjet All-in-One...
Canon U.S.A., Inc. has announced the PIXMA MG3620 Wireless (1) Inkjet All-in-One (AIO) printer for high-quality photo and document printing. Built with convenience in mind for the everyday home user... Read more
July 4th Holiday Weekend 13-inch MacBook Pro...
Save up to $150 on the purchase of a new 2015 13″ Retina MacBook Pro at the following resellers this weekend. Shipping is free with each model: 2.7GHz/128GB MSRP $1299 2.7GHz/... Read more
27-inch 3.5GHz 5K iMac on sale for $2149, sav...
Best Buy has the 27″ 3.5GHz 5K iMac on sale for $2149.99. Choose free shipping or free local store pickup (if available). Sale price for online orders only, in-store prices may vary. Their price is $... Read more
Apple now offering refurbished 2015 11-inch...
The Apple Store is now offering Apple Certified Refurbished 2015 11″ MacBook Airs as well as 13″ MacBook Airs (the latest models), available for up to $180 off the cost of new models. An Apple one-... Read more
15-inch 2.5GHz Retina MacBook Pro on sale for...
Amazon.com has the 15″ 2.5GHz Retina MacBook Pro on sale for $2274 including free shipping. Their price is $225 off MSRP, and it’s the lowest price available for this model. Read more
Finally Safe To Upgrade To Yosemite’?
The reason I’ve held back from upgrading my MacBook Air from OS X 10.9 Mavericks to 10.10 Yosemite for nearly a year isn’t just procrastination. Among other bugs reported, there have been persistent... Read more
Logo Pop Free Vector Logo Design App For OS X...
128bit Technologies has released of Logo Pop Free 1.2 for Mac OS X, a vector based, full-fledged, logo design app available exclusively on the Mac App Store for the agreeable price of absolutely free... Read more
21-inch 1.4GHz iMac on sale for $999, save $1...
B&H Photo has new 21″ 1.4GHz iMac on sale for $999 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Best Buy has the 21″ 1.4GHz iMac on sale for $999.99 on their... Read more
16GB iPad mini 3 on sale for $339, save $60
B&H Photo has the 16GB iPad mini 3 WiFi on sale for $339 including free shipping plus NY tax only. Their price is $60 off MSRP. Read more

Jobs Board

Mobile Payments Counsel, *Apple* Pay (digit...
**Job Summary** Apple is looking for an atto ey to join Apple 's Legal Department to support Apple Pay. **Key Qualifications** 4+ years of relevant experience Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** The ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store which delivers Read more
Partner Marketing Manager, Merchant- *Apple*...
**Job Summary** The Apple Pay partner marketing team is looking for a marketing manager to develop and drive US marketing programs with our merchant partners. The right Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
Program Manger, WW *Apple* Direct Fulfillme...
**Job Summary** We are seeking a business analyst to work within our Worldwide Apple Direct Fulfillment Operations team. This role will work closely with related program Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.