TweetFollow Us on Twitter

Oct 95 Top 10
Volume Number:11
Issue Number:10
Column Tag:Symantec Top 10

Symantec Top 10

This monthly column, written by Symantec’s Technical Support Engineers, aims to provide you with technical information based on the use of Symantec products.

By Noah Lieberman and Andy McFarland, Symantec Technical Support

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Q: I want to use QuickDraw 3D in my application. Is there anything special that I need to do to use it with Symantec C++ for the Power Macintosh?

A: Yes. There are some slight changes that must made to the interfaces and sample projects. We have a patch kit available that will allow you to use our compiler and has sample projects for all of the demos. You must also make sure that you have the QuickDraw GX headers. QuickDraw 3D interfaces and libraries are avilable from Apple as part of their MacOS SDK subscription.

Q: I have some binary data that was written with a MSDOS program that I want to read into my Macintosh program, but the numbers are all messed up. Why?

A: The two systems save numbers differently. The Motorola processors use big-endian numbers, and the Intel processor machines use little-endian numbers. There is a difference in how numbers are stored in memory and on the disk. For example, the long hexadecimal value $12345678 would be stored by an Intel processor as $34127856.

To convert a number as you read it into a Macintosh, you can use the following C code:

        long    longVal = ReadALong(srcFile); // read a long from the       // file
        char    *cp = (char*) &longVal;
        char    temp;

        temp = cp[0];
        cp[0] = cp[1];
        cp[1] = temp;

        temp = cp[2];
        cp[2] = cp[3];
        cp[3] = temp;

Of course, if you are real ambitious, the assembly code is MUCH simpler and faster:

        MOVE.L  longVal,D0
        ROR.W   #8,D0
        SWAP    D0
        ROR.W   #8,D0
        SWAP    D0
        MOVE.L  D0,longVal

So you could define the code like this for 68K:

 #pragma parameter __D0 Little2BigEndian(__D0)
 pascal long Little2BigEndian(long val) = {
        0xE058,         // ROR.W    #8,D0
        0x4840,         // SWAP     D0
        0xE058,         // ROR.W    #8,D0
        0x4840          // SWAP     D0
        };

        long  longVal =   Little2BigEndian(ReadALong(srcFile));

Q: I am using SPM 8.0.x and have created an array of 50 elements. However, when I look at the array in the debugger only the first 25 elements are displayed (0-24) in the data window. Is there now a limit to the number of array elements that can be displayed in the data window and if so, how do I view the values in the latter elements of my array?

A: There is an option in the SPM debugger, under the data menu, to set the array bounds. The default setting is 25 elements, starting from element 0 and ending with element 24. The upper limit of the array bounds is 32767 elements (0-32766) that can be displayed and you can display any subset of your array by setting the starting element (lower bounds) and the number of elements you want to display (display range).

Q: I am getting Undefined MyClassName::_VTBL what does it mean?

A: This is caused by declaring a function in the header file but not defining it in the source file.

Q: Is there any way to change the order in which code is compiled in the Symantec Project Manager?

A: You can set the “Save Project as Script” script to save the project as a script, physically change the lines in the script to reflect the desired build order, and then rebuild the project using the script.

Q: I have a 7.0.x VA application that I want to port to PowerPC, but if I open it with 8.0 and click the convert button in the conversion dialog, I am getting compiler and linker errors. Are there any alternate methods for updating to PPC?

A: Yes. Usually most of these errors are due to the lack of neccessary libraries. Create a new VA app with 8.0, and add your source files and VA Resource. This way the 8.0 VA project model will add the basic libraries for you.

Q: My code works fine on 68k but its crashing on PowerPC.

A: The PPC forces 4 byte struct alignment, which can often cause problem when converting from 68k. There is a pragma you can use to get around this problem:

 #if defined(powerc) || defined (__powerc)
 #pragma options align = mac68k
 #endif
 struct myRecord
 {
 OSType theOSType;
 unsigned short  theSize;
 };
 #if defined(powerc) || defined(__powerc)
 #pragma options align = reset
 #endif

Q: When I call x80told it sets the 8 bytes following the long double to 0.

example:

 void main()
 {
 long double   ld1, ld2;
 extended80 x80;

 ld2 = 131.416726;
 ldtox80(&ld2, &x80);
 x80told(&x80, &ld1);//when this is called, ld2 is set to 0
 } 

A: Apple’s MathLib expects true long doubles which are 16 bytes. You can get around this by passing an array of long double (i.e. long double ld1[2]).

Here is an example:

 void main()
 {
 long double   ld1[2], ld2;
 extended80 x80;

 ld2 = 131.416726;
 ldtox80(&ld2, &x80);
 x80told(&x80, ld1); // by passing the array, ld2 maintains it            // value
 }

Q: I rebuilt my PPCAnsi.o file with gla_alloc.c, but when I try and compile my project with this new file I get the error: “PPCANSI: specified file not recognized as a valid object”.

A: The Toolserver may not be installed on your Hard Disk. If this is the case you need to copy the toolserver folder from the Symantec C++ CD, and place an alias of Toolserver in your (Tools) folder.

Another possibility is that the modifications were made to the Shared Library PPCAnsi project instead of the Static Library project. gla_alloc.c needs to be added to the PPCAnsi_xcoff.Π project found in the Headers and Source folder in your Standard Libraries folder.

Q: I want to put a CStyleText into my view in VA, but there isn’t a tool for it in the tool palette.

A: Choose Classes from the edit menu. Enter the name of your new class (i.e. CMyStyleText) that will be derived from CStyleText. Choose CEditText from the Base Class: popup menu. Enter CStyleText into the Library Class: box; CMyStyleText will now be derived from CStyleText. Now use the Panorama tool from the tool palette to place a pane into your view. Select the pane, go to the Class submenu under the pane menu and select CMyStyleText.

Note: Normally the Library Class: box is for a class you have already derived from the Base Class, but this also works with other TCL classes as long as they are derived from the Base Class. For more info see p. 30-8 in the 8.0 User’s Guide, or p. 241 in the 7.0 Visual Architect and THINK Class Library Guide.

Special Thanks to Michael Hopkins, Craig Conner, Mark Baldwin, Scott Morison, Levi Brown, Steve Howard, Kevin Quah, Glenn Austin.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

OmniPlan Pro 3.6 - Professional-grade pr...
With OmniPlan Pro, you can create logical, manageable project plans with Gantt charts, schedules, summaries, milestones, and critical paths. Break down the tasks needed to make your project a success... Read more
Little Snitch 3.7.1 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more
iMazing 2.1.3 - Complete iOS device mana...
iMazing (was DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and from... Read more
AppDelete 4.3.1 - $7.99
AppDelete is an uninstaller that will remove not only applications but also widgets, preference panes, plugins, and screensavers along with their associated files. Without AppDelete these associated... Read more
FileZilla 3.23.0.2 - Fast and reliable F...
FileZilla (ported from Windows) is a fast and reliable FTP client and server with lots of useful features and an intuitive interface. Version 3.23.0.2: Bug Fixes and Minor Changes Speed up icon... Read more
PDFpen 8.3 - $74.95
PDFpen allows users to easily edit PDF's. Add text, images and signatures. Fill out PDF forms. Merge or split PDF documents. Reorder and delete pages. Even correct text and edit graphics! Features... Read more
TunnelBear 3.0.8 - 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
Safari Technology Preview 10.1 - The new...
Safari Technology Preview contains the most recent additions and improvements to WebKit and the latest advances in Safari web technologies. And once installed, you will receive notifications of... Read more
Ableton Live 9.7.1 - Record music using...
Ableton Live lets you create and record music on your Mac. Use digital instruments, pre-recorded sounds, and sampled loops to arrange, produce, and perform your music like never before. Ableton Live... Read more
BetterTouchTool 1.963 - Customize Multi-...
BetterTouchTool adds many new, fully customizable gestures to the Magic Mouse, Multi-Touch MacBook trackpad, and Magic Trackpad. These gestures are customizable: Magic Mouse: Pinch in / out (zoom... Read more

Latest Forum Discussions

See All

Bully: Anniversary Edition (Games)
Bully: Anniversary Edition 1.03.1 Device: iOS Universal Category: Games Price: $6.99, Version: 1.03.1 (iTunes) Description: *** PLEASE NOTE: This game is officially supported on the following devices: iPhone 5 and newer, iPod Touch... | Read more »
PINE GROVE (Games)
PINE GROVE 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: A pine grove where there are no footsteps of people due to continuous missing cases. The case is still unsolved and nothing has... | Read more »
Niantic teases new Pokémon announcement...
After rumors started swirling yesterday, it turns out there is an official Pokémon GO update on its way. We’ll find out what’s in store for us and our growing Pokémon collections tomorrow during the Starbucks event, but Niantic will be revealing... | Read more »
3 reasons why Nicki Minaj: The Empire is...
Nicki Minaj is as business-savvy as she is musically talented and she’s proved that by launching her own game. Designed by Glu, purveyors of other fine celebrity games like cult favorite Kim Kardashian: Hollywood, Nicki Minaj: The Empire launched... | Read more »
Clash of Clans is getting its own animat...
Riding on its unending wave of fame and success, Clash of Clans is getting an animated web series based on its Clash-A-Rama animated shorts.As opposed to the current shorts' 60 second run time, the new and improved Clash-A-Rama will be comprised of... | Read more »
Leaks hint at Pokémon GO and Starbucks C...
Leaked images from a hub for Starbucks employees suggests that a big Pokémon GO event with the coffee giant could begin this very week. The images appeared on Reddit and hint at some exciting new things to come for Niantic's smash hit game. | Read more »
Silent Depth Submarine Simulation (Game...
Silent Depth Submarine Simulation 1.0 Device: iOS Universal Category: Games Price: $7.99, Version: 1.0 (iTunes) Description: | Read more »
Enneas Saga lets you lead your own demon...
Defend the land of Enneas Continent from the forces of evil in the new fantasy MMORPG from Lyto Mobi: Enneas Saga. Can’t wait? No problem. It’s available to download now on Android devices. | Read more »
Great zombie games in the spirit of Dead...
Dead Rising 4 arrives tomorrow, giving enthusiasts a fresh chance to take selfies with zombies and get up to other ridiculous end-of-the-world shenanigans. To really get into the spirit of things, we've gone and gathered the best zombie games that... | Read more »
Amateur Surgeon 4 Guide: Advanced tips a...
Amateur Surgeon 4 is still tackling the competition at the top of the App Store charts, so if you haven't tried it out yet, you should probably do that right away. If you've been at it for a while, though, perhaps you're ready to start expanding... | Read more »

Price Scanner via MacPrices.net

Holiday sale: 12-inch Retina MacBook for $100...
B&H has 12″ Retina MacBooks on sale for $100 off MSRP as part of their Holiday sale. Shipping is free, and B&H charges NY sales tax only: - 12″ 1.1GHz Space Gray Retina MacBook: $1199 $100... Read more
Apple refurbished 13-inch MacBook Airs availa...
Apple has Certified Refurbished 13″ MacBook Airs available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: - 13″ 1.6GHz/8GB/128GB MacBook Air: $849 $... Read more
Apple refurbished iMacs available for up to $...
Apple has Certified Refurbished 2015 21″ & 27″ iMacs available for up to $350 off MSRP. Apple’s one-year warranty is standard, and shipping is free. The following models are available: - 21″ 3.... Read more
Apple’s Education discount saves up to $300 o...
Purchase a new Mac or iPad using Apple’s Education Store 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
Back in stock: Apple refurbished Mac minis fr...
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
Twenty-Five Years Of Apple Laptops – A person...
Among many other things, the often tumultuous 16th year of the new century marked the 25th anniversary of Apple laptop computers, not counting the optimistically named 16-pound Mac Portable of 1989.... Read more
Landlordy iOS App Adds Support For Appliances...
Riga, Latvia based E-protect SIA is releasing major update (version 1.8) to its Landlordy app for managing rental business financials on the go. Landlordy is iPhone and iPad app designed for self-... Read more
Holiday sale, Apple iMacs for up to $200 off...
B&H Photo has 21″ and 27″ Apple iMacs on sale for up to $200 off MSRP including free shipping plus NY sales tax only: - 27″ 3.3GHz iMac 5K: $2099 $200 off MSRP - 27″ 3.2GHz/1TB Fusion iMac 5K: $... Read more
Holiday sale: Mac minis for $50 to $100 off M...
B&H Photo has Mac minis on sale for up to $100 off MSRP free shipping plus NY sales tax only: - 1.4GHz Mac mini: $449 $50 off MSRP - 2.6GHz Mac mini: $629 $70 off MSRP - 2.8GHz Mac mini: $899 $... Read more
Mac Pros on sale for up to $300 off MSRP, ref...
B&H Photo has Mac Pros on sale for up to $300 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3699, $... Read more

Jobs Board

*Apple* Retail - Multiple Positions- Philade...
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- San Ant...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Products Tester Needed - Apple (Unit...
…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
SW Engineer *Apple* TV Frameworks - Apple I...
The Apple TV team is looking for a software...create features that reflect the look and feel of Apple TV. Description: Were looking for someone who is Read more
Hardware Design Validation Engineer - *Apple...
The Apple Watch team is looking for a Hardware Design Validation Engineer. This person will be part of the Apple Watch hardware team with responsibilities for Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.