TweetFollow Us on Twitter

Sep 96 Top 10
Volume Number:12
Issue Number:9
Column Tag:Symantec Top Ten

Symantec Top 10

By Craig Conner

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

This month we start with a few THINK Pascal questions, then run through questions dealing with exception handling (or lack thereof), and then finish off with some miscellaneous topics.

The first question is from a news post:

Q: I have a large THINK Pascal project that I have always compiled for 68K with a floating-point unit. I now want to compile for a 68030-based PowerBook that has no FPU. Unfortunately, I am having some problems linking. If I turn off 68881/68882 under Code Generation in the Compile Options dialog, I get a link error:

undefined: 3SINH2 (Activation.p)

undefined: 3TANH2 (Activation.p)

I need to use these functions but I do not know how to get rid of this error. I did remove the SANELib881.lib library and replace it with SANELib.lib, but I still get the error. Any suggestions?

A: Unfortunately, those functions are defined in SANE.p only if you are compiling with 68881/68882 on. Fortunately, here are sinh, cosh, and tanh defined:

 function SinH(x:real):extended;
 begin
 sinH:=(exp(x) - exp(-x))/2;
 end;

 function CosH(x:real):extended;
 begin
 cosH := (exp(x)+exp(-x))/2;
 end;

 function TanH(x:real):extended;
 begin
 TanH := SinH(x)/CosH(x);
 end;

 TanH can be optimized like this:

 function TanH(x:real):extended;
 var
 eToX, eToNegX:extended;
 begin
 eToX := exp(x);
 eToNegX := exp(-x);
 TanH := ( eToX - eToNegX ) / (eToX + eToNegX);
 end;

It will be a tad slower than using SANE, but it will work. You can look at how exp(x) works on p. 358 of the THINK Pascal Users Manual, and the hyperbolic functions in any trigonometry textbook.

Q: When using THINK Pascal, I want to create my own pattern for use with the PenPat routine. How do I do this?

A: You should use the StuffHex routine (QuickDraw) to build your patterns. StuffHex will interpret its argument as an 8-by-8 bit-pattern with 1’s denoting “on” bits, and 0’s denoting “off” bits. Like so:

var
 myPat :Pattern;

StuffHex(@myPat, 'FFFFFFFFFFFFFFFF'); {All on}

Q: In THINK Pascal, whenever I try TextFace(bold), I get an “incompatible type” error. Why?

A: The “styles” used in Pascal are values in a set and need to be expressed as [bold], [underline], [italic], etc. Normal text is specified as the empty set, []. Try:

TextFace([bold]);


Q: In a TCL project that I am updating to version 8.1, I get an “undefined” error on catch_. What might cause this?

A: If you are using native exceptions (which is standard for 8.1 projects), catch_ has been redefined as catch_reference. Here is an example:

try_
{
   DoIt();
}
catch_reference(CException, e)
{
   errVal = e.GetErr();
}
catch_all_()
{
   errVal = -1;
}
end_try_

Q: I have just completed my latest project using TCL, and want to use MrC++ for the finishing touch. However, I get link errors when trying to build it. Why?

A: MrC and MrC++ do not have native exceptions built in, so you need to change the libraries some to get your project to link correctly. Remove the current CPlusLib TCL.o and BRLib libraries, and replace them with the ones that use the non-native exception handling. These are CPlusLib TCL_BELeh.o and BRLib(non-native eh).o. That should get it working.

Q: I just saw a note in the fp.h header recently about dtox80 and x80tod being contained in a library called MathLib v.2. Why was it not included on the last CD?

A: That note in the header file is premature. Apple has not released a new version yet. Currently you can use ldtox80 and x80told and they will work correctly.

Q: While compiling the OpenDoc project ODFFramewrk.RB.Π I get “not enough memory” errors when trying to load the precompiled header called ODFHeaders.RB. How can I fix this?

A: The obvious answer is to get more RAM. OpenDoc will require at least 32 megs, and the more the merrier. Turning on Virtual Memory should also work, but will slow compiling down. If Virtual Memory is too slow, you can change the size of the precompiled header using a switch set up for the headers. In the ODF.pch file, there is a:

#define FW_AGGRESSIVE_PRECOMPILE 1

Change this to 0 and then do the same for FWEnvDev.h. After re-precompiling, the ODFHeaders.RB file will be smaller.

Q: I am trying to build a 68K version of one of my SPM projects. I get the following error at link time using Link via ToolServer:

### While reading file "long pathname:MPW68KRuntime.o.o"
### Link: Error: PC-relative edit, offset out of range.
(Error 48) %__MAIN (309)
Reference to: main in file: pathname:main.cp.o

A: There are some nuances that you need to take care of when using ToolServer to link a 68K application in the link order file (the .lo file). The MPW68KRuntime library uses Near code, so it needs to be near the top of the list (in one of the first two segments that get created). Also, since that library calls the main routine, the file that contains that routine needs to be near that library. If you get a similar error after rearranging, then you need to turn on Far Code in the linker options, and use Far libraries where possible. Any library that does not have a Far version (like the runtime lib) needs to go near the top of the list.

Q: When using the alloc_gla memory package with the Vector demo, it reports heap corruption. What is wrong with the example?

A: Looking at the example, we see code like this:

    vector(int size)   { v = new T[size]; sz = size; };
    ~vector()          { delete v; };

This code may have been correct at one time, but nowadays it is not. Since the new call allocates an array, the delete operator is no longer the proper operator to use. Instead, the delete[] operator should be used, and alloc_gla will stop complaining:

    vector(int size)   { v = new T[size]; sz = size; };
    ~vector()          { delete[] v; };

Q: If I realign a structure like so:

#pragma options align=mac68k
struct{
...
}myStruct;
#pragma options align=powerpc 

my program crashes when trying to use myStruct. What might be happening?

A: The default setup for PPC projects is to use four-byte boundaries. align=powerpc will align to two-byte boundaries, and could cause incompatibilities. Use #pragma options align=reset instead, and that should fix the problem.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

BBEdit 11.6.5 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more
OmniGraffle 7.3 - Create diagrams, flow...
OmniGraffle 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 Graffle to... Read more
OmniGraffle Pro 7.3 - Create diagrams, f...
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
DEVONthink Pro 2.9.11 - Knowledge base,...
DEVONthink Pro is your essential assistant for today's world, where almost everything is digital. From shopping receipts to important research papers, your life often fills your hard drive in the... Read more
DiskCatalogMaker 6.8.1 - Catalog your di...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast Finder-like intuitive look and feel Super-fast search algorithm Can compress catalog data for... Read more
Tunnelblick 3.7.0 - GUI for OpenVPN.
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more
Adobe Dreamweaver CC 2017 17.0.2.9391 -...
Dreamweaver CC 2017 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Dreamweaver customer). Adobe Dreamweaver CC 2017 allows you to... Read more
Adobe Animate CC 2017 16.2.0 - Advanced...
Animate CC 2017 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Flash Professional customer). Animate CC 2017 (was Flash CC) lets you... Read more
A Better Finder Rename 10.15 - File, pho...
A Better Finder Rename is the most complete renaming solution available on the market today. That's why, since 1996, tens of thousands of hobbyists, professionals and businesses depend on A Better... Read more
Creative Kit 1.1 - $149.99
Creative Kit 2016--made exclusively for Mac users--is your ticket to the most amazing images you've ever created. With a variety of powerful tools at your fingertips, you'll not only repair and fine-... Read more

Power Rangers: Legacy Wars beginner...
Rita Repulsa is back, but this time she's invading your mobile phone in Power Rangers: Legacy Wars. What looks to be a straightforward beat 'em up is actually a tough-as-nails multiplayer strategy game that requires some deft tactical maneuvering.... | Read more »
Hearthstone celebrates the upcoming Jour...
Hearthstone gets a new expansion, Journey to Un'Goro, in a little over a week, and they'll be welcoming the Year of the Mammoth, the next season, at the same time. There's a lot to be excited about, so Blizzard is celebrating in kind. Players will... | Read more »
4 smart and stylish puzzle games like Ty...
TypeShift launched a little over a week ago, offering some puzzling new challenges for word nerds equipped with an iOS device. Created by Zach Gage, the mind behind Spelltower, TypeShift boasts, like its predecessor, a sleak design and some very... | Read more »
The best deals on the App Store this wee...
Deals, deals, deals. We're all about a good bargain here on 148Apps, and luckily this was another fine week in App Store discounts. There's a big board game sale happening right now, and a few fine indies are still discounted through the weekend.... | Read more »
The best new games we played this week
It's been quite the week, but now that all of that business is out of the way, it's time to hunker down with some of the excellent games that were released over the past few days. There's a fair few to help you relax in your down time or if you're... | Read more »
Orphan Black: The Game (Games)
Orphan Black: The Game 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Dive into a dark and twisted puzzle-adventure that retells the pivotal events of Orphan Black. | Read more »
The Elder Scrolls: Legends is now availa...
| Read more »
Ticket to Earth beginner's guide: H...
Robot Circus launched Ticket to Earth as part of the App Store's indie games event last week. If you're not quite digging the space operatics Mass Effect: Andromeda is serving up, you'll be pleased to know that there's a surprising alternative on... | Read more »
Leap to victory in Nexx Studios new plat...
You’re always a hop, skip, and a jump away from a fiery death in Temple Jump, a new platformer-cum-endless runner from Nexx Studio. It’s out now on both iOS and Android if you’re an adventurer seeking treasure in a crumbling, pixel-laden temple. | Read more »
Failbetter Games details changes coming...
Sunless Sea, Failbetter Games' dark and gloomy sea explorer, sets sail for the iPad tomorrow. Ahead of the game's launch, Failbetter took to Twitter to discuss what will be different in the mobile version of the game. Many of the changes make... | Read more »

Price Scanner via MacPrices.net

Is Apple Planning An iPhone Based Modular Doc...
Today’s more powerful and larger-screened smartphones and phablets are becoming the default anchor computing device for more and more users computing devices, but even a five or six inch panel is not... Read more
Razer Launches New Razer Blade Pro World’s Fi...
Razer, the gaming and high performance hardware specialists, have announced the new Razer Blade Pro laptop — the first laptop to be qualified for THX Mobile Certification, an accreditation reserved... Read more
Gro CRM’s Apple Small Business Mac And iOS CR...
Gro Software, developers of the Mac CRM software for small business and enterprise, are included in FinancesOnline 2017 CRM Rising Stars and Great User Experience lists by business software review... Read more
Deal alert! 15-inch and 13-inch MacBook Pros...
B&H Photo has the new 2016 15″ and 13″ Apple MacBook Pros in stock today and on sale for up to $200 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.7GHz Touch Bar... Read more
Save up to $420 on a new MacBook Pro with App...
Apple is offering Certified Refurbished 2016 15″ and 13″ MacBook Pros, including some Touch Bar models, for up to $420 off original MSRP. An Apple one-year warranty is included with each model, and... Read more
12-inch 1.2GHz Retina MacBooks on sale for $1...
B&H has 12″ 1.2GHz Retina MacBooks on sale for up to $200 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 12″ 1.2GHz Space Gray Retina MacBook: $1449 $150 off MSRP - 12″ 1.... Read more
Is A New 10.5-inch iPad Still Coming In April...
There was no sign or mention of a long-rumored and much anticipated 10.5-inch iPad Pro in Apple’s product announcements last week. The exciting iPad news was release of an upgraded iPad Air with a... Read more
T-Mobile’s Premium Device Protection Now Incl...
Good news for T-Mobile customers who love their iPhones and iPads. The “Un-carrier” has become the first national wireless company to give customers AppleCare Services at zero additional cost as part... Read more
FileWave Ensures Support for Latest Apple OS...
FileWave multi-platform device management providers announced support for Apple’s release yesterday of iOS 10.3, macOS Sierra 10.12.4, and tvOS 11.2. FileWave has a history of providing zero-day... Read more
Use Apple’s Education discount to save up to...
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

Jobs Board

Fulltime aan de slag als shopmanager in een h...
Ben jij helemaal gek van Apple -producten en vind je het helemaal super om fulltime shopmanager te zijn in een jonge en hippe elektronicazaak? Wil jij werken in Read more
Fulltime aan de slag als shopmanager in een h...
Ben jij helemaal gek van Apple -producten en vind je het helemaal super om fulltime shopmanager te zijn in een jonge en hippe elektronicazaak? Wil jij werken in Read more
Desktop Analyst - *Apple* Products - Montef...
…technology to improve patient care. JOB RESPONSIBILITIES: Provide day-to-day support for Apple Hardware and Software in the environment based on the team's support Read more
*Apple* Mobile Master - Best Buy (United Sta...
**493168BR** **Job Title:** Apple Mobile Master **Location Number:** 000827-Denton-Store **Job Description:** **What does a Best Buy Apple Mobile Master do?** At Read more
Fulltime aan de slag als shopmanager in een h...
Ben jij helemaal gek van Apple -producten en vind je het helemaal super om fulltime shopmanager te zijn in een jonge en hippe elektronicazaak? Wil jij werken in Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.