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

Logic Pro X 10.1.1 - Music creation and...
Apple Logic Pro X is the most advanced version of Logic ever. Sophisticated new tools for professional songwriting, editing, and mixing are built around a modern interface that's designed to get... Read more
VLC Media Player 2.2.0 - Popular multime...
VLC Media Player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, MP3, OGG, ...) as well as DVDs, VCDs, and various streaming protocols. It... Read more
Sound Studio 4.7.8 - Robust audio record...
Sound Studio lets you easily record and professionally edit audio on your Mac. Easily rip vinyls and digitize cassette tapes, or record lectures and voice memos. Prepare for live shows with live... Read more
LibreOffice 4.4.1.2 - Free, open-source...
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
Freeway Pro 7.0.3 - Drag-and-drop Web de...
Freeway Pro lets you build websites with speed and precision... without writing a line of code! With its user-oriented drag-and-drop interface, Freeway Pro helps you piece together the website of... Read more
Cloud 3.3.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
Cyberduck 4.6.5 - 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
Firefox 36.0 - Fast, safe Web browser. (...
Firefox for Mac offers a fast, safe Web browsing experience. Browse quickly, securely, and effortlessly. With its industry-leading features, Firefox is the choice of Web development professionals and... Read more
Thunderbird 31.5.0 - Email client from M...
As of July 2012, Thunderbird has transitioned to a new governance model, with new features being developed by the broader free software and open source community, and security fixes and improvements... Read more
VOX 2.4 - Music player that supports man...
VoxIt just sounds better! The beauty is in its simplicity, yet behind the minimal exterior lies a powerful music player with a ton of features & support for all audio formats you should ever need... Read more

Get The Whole Story – Lone Wolf Complete...
Get The Whole Story – Lone Wolf Complete is Now Available and On Sale Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Who Wore it Best? The Counting Dead vs....
Like it or not, the “clicker” genre, popularized by cute distractions like Candy Box and Cookie Clicker, seems like it’s here to stay. So Who Wore it Best? takes a look at two recent examples: The Counting Dead and AdVenture Capitalist. | Read more »
Card Crawl, the Mini Deck Building Game,...
Card Crawl, the Mini Deck Building Game, is Coming Soon Posted by Jessica Fisher on February 27th, 2015 [ permalink ] Tinytouchtales and Mexer have announced their new game, | Read more »
Witness an all new puzzle mechanic in Bl...
Well, BlastBall MAX is not one of those games and is bucking trends such as timers, elements of randomness, and tacked-on mechanics in favor of pure puzzle gameplay. When you first boot up the game you’ll see a grid made up of squares that are each... | Read more »
This Princess Has a Dragon and She isn’t...
This Princess Has a Dragon and She isn’t Afraid to Useit. | Read more »
Mecha Showdown Review
Mecha Showdown Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IN A SPINUniversal App - Designed for iPhone and iPad Mecha Showdown replaces traditional buttons with a slot machine mechanic in this robot fighting game,... | Read more »
Reliance Games and Dreamworks Unveil Rea...
Reliance Games and Dreamworks Unveil Real Steel Champions Posted by Ellis Spice on February 27th, 2015 [ permalink ] Reliance Games and Dreamworks have announced that a third game in | Read more »
Sum Idea Review
Sum Idea Review By Jennifer Allen on February 27th, 2015 Our Rating: :: TAXING NUMBERSUniversal App - Designed for iPhone and iPad Sum Idea is a fairly charming but taxing puzzle game.   | Read more »
A New Badland Update Brings Daydream Lev...
A New Badland Update Brings Daydream Levels to Co-Op Posted by Ellis Spice on February 27th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Slashing Demons Review
Slashing Demons Review By Lee Hamlet on February 27th, 2015 Our Rating: :: IT'S A LONG WAY TO THE TOPUniversal App - Designed for iPhone and iPad Slashing Demons lacks the depth or scope to take it beyond the point of being just... | Read more »

Price Scanner via MacPrices.net

Apple CEO Tim Cook to Deliver 2015 George Was...
Apple CEO Tim Cook will deliver the George Washington University’s Commencement address to GWU grads on May 17, at which time he will also be awarded an honorary doctorate of public service from the... Read more
Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz... Read more
Save up to $50 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $50 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549 $50 off - 128GB iPad Air 2... Read more
16GB iPad Air 2 on sale for $447, save $52
Walmart has the 16GB iPad Air 2 WiFi on sale for $446.99 on their online store for a limited time. Choose free shipping or free local store pickup (if available). Sale price for online orders only,... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1029 $70 off - 21″ 2.7GHz iMac: $1199 $100 off - 21″ 2.9GHz... Read more
Apple Takes 89 Percent Share of Global Smartp...
According to the latest research from Strategy Analytics, global smartphone operating profit reached US$21 billion in Q4 2014. The Android operating system captured a record-low 11 percent global... Read more
New Travel Health App “My Travel Health” iOS...
Rochester, Minnesota based Travel Health and Wellness LLC has announced that its new iOS app help safeguard the user’s health when traveling abroad — “My Travel Health” is now available on the Apple... Read more
Sale! MacBook Airs for up to $115 off MSRP
B&H Photo has MacBook Airs on sale for up to $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 128GB MacBook Air: $799 100 off MSRP - 11″ 256GB MacBook Air: $999 $100... 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
Wither The iPad mini? End Of The Road Imminen...
AppleDailyReport’s Dennis Sellers predicts that the iPad mini is going to be left to wither on the vine, as it were, and then just allowed to fade away — a casualty of the IPhone 6 Plus and other... Read more

Jobs Board

Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Event Director, *Apple* Retail Marketing -...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global engagement strategy and team. Delivering an overarching brand Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple 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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.