TweetFollow Us on Twitter

Jan 95 Top 10
Volume Number:11
Issue Number:1
Column Tag:Think Top 10

Think Top 10

This monthly column, written by Symantec’s Technical Support Engineers, aims to provide you with information on Symantec products. Each month we cover either a specific application of tools or a “Q&A” list.

By Craig Conner and Rick Hartmann, Symantec Technical Support

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

Q: Why do I get a bus error when I try to use the VIA timer option for the profiler?

A: The Symantec C++ 7 documentation states that the profiler uses the VIA (Versatile Interface Adapter) timer which ticks every 1.28 microseconds. If you want to use Ticks (1/60 of a second), modify the profiler code to do so. Not all Macintosh models contain a VIA timer chip. To find out if your Mac has a VIA timer chip, you should use the functions gestaltHasVIA1 or gestaltHasVIA2 (Mac II).

If you have the chip, modify profile.c as follows:

#ifdef _VIATIMER_ 
  #define Ticks VIA_Ticks() 
  #define Ticks LMGetTicks() 

Next, remove all of the #ifdef __CONDITIONALMACRO__ statements in profile.c, then use the Ticks assignments.

Q: Why can’t I use fopen to open more than 12 files?

A: stdio.h defines a table for keeping track of open files. This table is defined as:

extern FILE __file[FOPEN_MAX]; 

where FOPEN_MAX is declared as 15. Three streams are reserved for stdin, stdout, and stderr which leaves 12 more for you to use. To open more than twelve files, increase the value of FOPEN_MAX and recompile the ANSI library. Alternatively, you can use Macintosh Toolbox calls to open files; those files are not counted against the limit.

Q: When I try to use TESetWordBreak I get a link error.

A: Below is an example of how to use TESetWordBreak with the current Universal Headers. The changes only apply to 68K use. You can use TESetWordBreak directly when compiling for PowerPC. Basically the problem is that Apple doesn’t provide the glue for the new routine name, but has written the Universal Headers as if they did. [This was fixed on ETO #15. Interface.o on ETO #15 has an extra entry point added for TESetWordBreak. There was also the same problem and fix for SetClikLoop -> TESetClickLoop - Ed stb]

#include <TextEdit.h>

// Need to undo the redefinition of SetWordBreak in the Universal Headers when in 
// 68K.  Glue for SetWordBreak is in MacTraps, but there is no glue for 
// TESetWordBreak.  We also need to redefine any calls using the new name 
// for the same reason

#ifndef powerc 
#undef SetWordBreak 
extern pascal void SetWordBreak(WordBreakUPP wBrkProc,TEHandle hTE); 

#define TESetWordBreak(wBrkProc, hTE) SetWordBreak(wBrkProc, hTE) 

pascal Boolean myWordBreaker(Ptr textPtr, short offset );

void foo() 
 TEHandle hTE;
 WordBreakUPP brk = NewWordBreakProc(myWordBreaker);
 // either of the following two are ok
 SetWordBreak(brk, hTE);
 TESetWordBreak(brk, hTE); 

pascal Boolean myWordBreaker(Ptr textPtr, short offset ) 
 if (textPtr[offset] == 's' )  
  return true;
  return false; 

Q: How do I use new to obtain a two dimensional array?

A: Each row element in a two dimensional array is actually a pointer to the row. To access a two dimensional array using new, you need to tell the compiler that you want two dimensions like so:

int (*intarr)[3] = new int[2][3];

Then you can access the memory using array references, e.g. intarr[1][1].

Q: Do I have to declare objects as “volatile” in TRY/CATCH macros?

A: Yes. When a TRY is executed, all registers are saved. When CATCH is executed, the registers are restored to the saved state. If you change a value of a non-volatile variable within a TRY block, it’s possible that the value will be restored to what it was before the TRY when the CATCH is triggered. If you use a volatile variable, the compiler forces its value to be saved to memory any time it’s changed, and won’t let it be cached in a register.

Q: Do I need to recompile the ANSI++ library with 8-byte doubles to use it in a Visual Architect project?

A: 8-byte doubles are no longer required for VA (or other TCL) projects. The default VA project still ships with 8-byte doubles on while the ANSI++ library ships with it off. It is ok to turn this option off in your TCL projects.

Q: How do I trap CRadioControl commands within a dialog?

A: By default the values of radio buttons are not verified until a dialog box finishes the DoModalDialog() function. DoModalDialog returns a command of type long. At this point, the programmer should create a switch statement where the values of radio buttons are checked with the (CRadioGroupPane*)FindViewByID->GetStationID(theRadioDITL) method.

The problem with this style is that the values of the radio buttons are obtained after the dialog is dismissed. Often, the programmer will want to have the changing values of radio buttons change the characteristics of items in the dialog itself. For example, a programmer may want the font of a CDialogText to change according to the settings of radio buttons.

The solution has three parts.

1) Set up your derived CDLOGDirector class so that it owns the CRadioControl pointers. This will give you access to the radio buttons throughout your class.

2) When you instantiate CRadioControl make a call to SetClickCmd(). Make sure to set each button with its own command. For the command to work, it must be something other than zero.

 myRadio1->SetClickCmd( cmdFontGeneva);

3) Add a DoCommand() function to your derived CDLOGDirector class.

 MyDialogDirector::DoCommand(theCommand) {
 switch (theCommand)
  case cmdFontGeneva:
  myDialogText->SetTextFont(3);    //Set font to geneva
  case cmdFontChicago:
  myDialogText->SetTextFont(0);    //Set font to chicago
  inherited::DoCommand(theCommand);  //important

The default statement is extremely important for this construct. The inherited DoCommand() is trapped by CDialogDirector to process the OK and Cancel command. If you do not trap these commands yourself, or do not have an inherited method trap them, you will not be able to dismiss the dialog.

Q: In Visual Architect, can I have main windows that are not based on CSaver?

A: In Visual Architect 7.0.4, the code generation does not recognize the checkbox for the “Use File” option. The solution is to change the code in the “GenerateTCLApp” VA template file for documents, as follows:

$elseif class.basename == "CDocument"$
 $generate "Source:$$.cp" "Doc_cp" once$
 $generate "Source:$$.h" "Doc_h" once$
 $if class.view.usefile$
  $generate "Source:ItsContents_$$.h"  "ItsContentsClass_h" 
  $generate "Source:CSaver_$$.cpp" "CSaver_class_cpp"  once$
 $end if$
 $define do_document 1$

Q: How do I change the font attributes in CStdPopupPane?

A: Changing the font of popup menus is not intuitively obvious. The process involves several steps.

1) Create a menu resource with a title and a menu item. Remember its ID number.

2) Instantiate your CStdPopupPane.

myPopUp = TCL_NEW( CStdPopupPane, (menuID, itsWindow, this,
  0,0, 100,100, TRUE, FALSE, FALSE));

3) Make sure to #include CTextEnvirons. Then create a local pointer to a TextInfoRec, and fill the struct with the text information that you want in your popup.

TextInfoRec * myTextInfo = new TextInfoRec;

myTextInfo->fontNumber = 10;
myTextInfo->theSize = 12;
myTextInfo->theStyle = bold;
myTextInfo->theMode = qd.thePort->txMode;

4) Cast the itsEnvironment member of the CStdPopUpPane as a CTextEnvirons, allocate memory for it, and call the SetTextInfo() method.

(CTextEnvirons*)myPopUp->itsEnvironment = 
 TCL_NEW (CTextEnvirons, (FALSE));

5) Don’t forget to delete the temporary variable myTextInfo.

Q: Visual Architect projects take so long to compile. How can I reduce the compile time? (Reprise)

A: In October’s Think Top 10 we had a question concerning saving time when using VA projects. The answer we gave was to compile the @1.Π file in the Visual Architect Project Model. The problem with that is that the debugging information doesn’t get copied when you create a new project.

To avoid that problem, before you compile, uncheck the Store Debug Info Separately switch in the debugger options for the Think Project Manager. This will store the debug info inside of the project file, so that it will be copied into your new project. If you wish, you can uncheck the switch after creating your project; it won’t force a recompilation.

Thanks to Michael Hopkins, Mark Baldwin, Steve Howard,
Phil Shapiro, Rich Parker, and the rest of the gang.


Community Search:
MacTech Search:

Software Updates via MacUpdate

Opera 40.0.2308.90 - High-performance We...
Opera is a fast and secure browser trusted by millions of users. With the intuitive interface, Speed Dial and visual bookmarks for organizing favorite sites, news feature with fresh, relevant content... Read more
BetterTouchTool 1.93 - Customize Multi-T...
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
Backblaze - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac. With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Postbox 5.0.5 - Powerful and flexible em...
Postbox is a new email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even... Read more
Coda 2.5.19 - 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
Toast Titanium 15.1 - $99.99
Roxio Toast 15 Titanium, the leading DVD burner for Mac, makes burning even better, adding Roxio Secure Burn to protect your files on disc and USB in Mac- or Windows-compatible formats. Get more... Read more
Firetask 3.8.1 - Innovative task managem...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more
Chromium 54.0.2840.71 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 54.0.2840.71: Release notes were unavailable... Read more
Chromium 54.0.2840.71 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. Version 54.0.2840.71: Release notes were unavailable... Read more
Firetask 3.8.1 - Innovative task managem...
Firetask uniquely combines the advantages of classical priority-and-due-date-based task management with GTD. Stay focused and on top of your commitments - Firetask's "Today" view shows all relevant... Read more

Latest Forum Discussions

See All

WitchSpring2 (Games)
WitchSpring2 1.27 Device: iOS Universal Category: Games Price: $3.99, Version: 1.27 (iTunes) Description: This is the story of Luna, the Moonlight Witch as she sets out into the world. This is a sequel to Witch Spring. Witch Spring 2... | Read more »
Best Fiends Forever Guide: How to collec...
The fiendship in Seriously's hit Best Fiends has been upgraded this time around in Best Fiends Forever. It’s a fast-paced clicker with lots of color and style--kind of reminiscent of a ‘90s animal mascot game like Crash Bandicoot. The game... | Read more »
5 apps for the budding mixologist
Creating your own cocktails is something of an art form, requiring a knack for unique tastes and devising interesting combinations. It's easy to get started right in your own kitchen, though, even if you're a complete beginner. Try using one of... | Read more »
5 mobile strategy games to try when you...
Strategy enthusiasts everywhere are celebrating the release of Civilization VI this week, and so far everyone seems pretty satisfied with the first full release in the series since 2010. The series has always been about ultra-addictive gameplay... | Read more »
Popclaire talk to us about why The Virus...
Humanity has succumbed to a virus that’s spread throughout the world. Now the dead have risen with a hunger for human flesh, and all that remain are a few survivors. One of those survivors has just called you for help. That’s the plot in POPCLAIRE’... | Read more »
Oceans & Empires preview build sets...
Hugely ambitious sea battler Oceans & Empires is available to play in preview form now on Google Play - but download it quickly, as it’s setting sail away in just a few days. [Read more] | Read more »
Rusty Lake: Roots (Games)
Rusty Lake: Roots 1.1.4 Device: iOS Universal Category: Games Price: $2.99, Version: 1.1.4 (iTunes) Description: James Vanderboom's life drastically changes when he plants a special seed in the garden of the house he has inherited.... | Read more »
Flippy Bottle Extreme! and 3 other physi...
Flippy Bottle Extreme! takes on the bottle flipping craze with a bunch of increasingly tricky physics platforming puzzles. It's difficult and highly frustrating, but also addictive. When you begin to master the game, the sense of achievement is... | Read more »
Plants vs. Zombies Heroes guide: How to...
Plants vs. Zombies Heroes surprised us all, presenting a deep deck building experience. It's a great CCG that stands up well to the competition. There are a lot of CCGs vying for players' attention at the moment, but PvZ Heroes is definitely one... | Read more »
Arcane Online takes Online RPG’s to anot...
If you think that you need a desktop to enjoy high quality MMO gaming then Arcane Online hopes to prove you emphatically wrong. An epic fantasy Online RPG set in the land of Eldine, Arcane Online offers an abundance of features and content that... | Read more »

Price Scanner via

Apple’s Thursday “Hello Again” Event A Largel...
KGI Securities analyst Ming-Chi Kuo, who has a strong record of Apple hardware prediction accuracy, forecasts in a new note to investors released late last week that a long-overdue redo of the... Read more
12-inch Retina MacBooks on sale for $100 off...
Amazon has 2016 12″ Apple Retina MacBooks on sale for $100 off MSRP. Shipping is free: - 12″ 1.1GHz Silver Retina MacBook: $1199.99 $100 off MSRP - 12″ 1.1GHz Gold Retina MacBook: $1199.99 $100 off... Read more
Save up to $600 with Apple refurbished Mac Pr...
Apple has Certified Refurbished Mac Pros available for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The following... Read more
PixelStyle Inexpensive Photo Editor For Mac W...
PixelStyle is an all-in-one Mac Photo Editor with a huge range of high-end filters including lighting, blurs, distortions, tilt-shift, shadows, glows and so forth. PixelStyle Photo Editor for Mac... Read more
13-inch MacBook Airs on sale for $100-$140 of...
B&H has 13″ MacBook Airs on sale for $100-$140 off MSRP for a limited time. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/128GB MacBook Air (sku MMGF2LL/A): $899 $100 off... Read more
2.8GHz Mac mini available for $988, includes...
Adorama has the 2.8GHz Mac mini available for $988, $11 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more
21-inch 3.1GHz 4K on sale for $1379, $120 off...
Adorama has the 21″ 3.1GHz 4K iMac on sale $1379.99. Shipping is free, and Adorama charges NY & NJ sales tax only. Their price is $120 off MSRP. To purchase an iMac at this price, you must first... Read more
Check Apple prices on any device with the iTr...
MacPrices is proud to offer readers a free iOS app (iPhones, iPads, & iPod touch) and Android app (Google Play and Amazon App Store) called iTracx, which allows you to glance at today’s lowest... Read more
Apple, Samsung, Lead J.D. Power Smartphone Sa...
Customer satisfaction is much higher among smartphone owners currently subscribing to full-service wireless carriers, compared with those purchasing service through a non-contract carrier, according... Read more
Select 9-inch Apple WiFi iPad Pros on sale fo...
B&H Photo has select 9.7″ Apple WiFi iPad Pros on sale for up to $50 off MSRP, each including free shipping. B&H charges sales tax in NY only: - 9″ Space Gray 256GB WiFi iPad Pro: $799 $0 off... Read more

Jobs Board

*Apple* Retail - Multiple Positions- Napervi...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Security Data Analyst - *Apple* Information...
…data sources need to be collected to allow Information Security to better protect Apple employees and customers from a wide range of threats.Act as the subject Read more
*Apple* Retail - Multiple Positions (Multi-L...
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- New Yor...
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* Retail - Multiple Positions- Yonkers...
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.