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() 
#else 
  #ifdef __CONDITIONALMACROS__ 
  #define Ticks LMGetTicks() 
  #endif 
#endif

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) 
#endif

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;
 else
  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
  break;
  case cmdFontChicago:
  myDialogText->SetTextFont(0);    //Set font to chicago
  break;
  default:
  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:

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

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));
((CTextEnvirons*)myPopUp->itsEnvironment)-> 
 SetTextInfo(myTextInfo);

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

FileMaker Pro 19.4.2 - Quickly build cus...
FileMaker Pro is the tool you use to create a custom app. You also use FileMaker Pro to access your app on a computer. Start by importing data from a spreadsheet or using a built-in Starter app to... Read more
Adobe Illustrator 26.0.3 - Professional...
You can download Adobe Illustrator for Mac as a part of Creative Cloud for only $20.99/month. Adobe Illustrator for Mac is the vector graphics classics in the design industry. It is a digital... Read more
WhatRoute 2.4.9 - Geographically trace o...
WhatRoute is designed to find the names of all the routers an IP packet passes through on its way from your Mac to a destination host. It also measures the round-trip time from your Mac to the router... Read more
Notion 2.0.20 - A unified workspace for...
Notion is the unified workspace for modern teams. Notion Features: Integration with Slack Documents Wikis Tasks Release notes were unavailable when this listing was updated. Download Now]]> Read more
Monterey Cache Cleaner 17.0.2 - Clear ca...
Monterey Cache Cleaner is an award-winning general-purpose tool for macOS X. MCC makes system maintenance simple with an easy point-and-click interface to many macOS X functions. Novice and expert... Read more
Firetask Pro 4.6.8 - Innovative task man...
Firetask Pro represents the next generation of easy-to-use, project-oriented task management apps. By combining David Allen's powerful Getting Things Done (GTD®) approach with classical task... Read more
Smultron 13.0.4 - Easy-to-use, powerful...
Smultron 13 is the text editor for all of us. Smultron is powerful and confident without being complicated. Its elegance and simplicity helps everyone being creative and to write and edit all sorts... Read more
Box Sync 4.0.8057 - Online synchronizati...
Box Sync gives you a hard-drive in the Cloud for online storage. Note: You must first sign up to use Box. What if the files you need are on your laptop -- but you're on the road with your iPhone? No... Read more
Audio Hijack 3.8.10 - Record and enhance...
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio... Read more
Direct Mail 6.0.1 - Create and send grea...
Direct Mail is an easy-to-use, fully-featured email marketing app purpose-built for macOS. Create, send, and track great looking email campaigns that get results. Start your newsletter by selecting... Read more

Latest Forum Discussions

See All

Hopefully Not Jared’s Last Show – The To...
My suspicions from last week were correct, and after my two kids tested positive for Covid last week both my wife and I have now tested positive as well. It seems you just can’t escape this stuff lately. Thankfully the two little ones are pretty... | Read more »
TouchArcade Game of the Week: ‘Micro RPG...
I feel like idle games are one of those perfect fits for the mobile platform. Not that they replace more involved gaming experiences when you’re in the mood for that, but they do fit in alongside other types of games just fine as a “go to" when you... | Read more »
‘Phantom Blade: Executioners’ Closed Bet...
Phantom Blade: Executioners is holding a small-scale technical test that lets players get first dibs on the KungFuPunk action RPG. Offered to selected players only, S-Game’s first Closed Beta Test will provide players with limited edition in-game... | Read more »
New ‘Warhammer 40,000: Tacticus’ Video S...
Back in September Snowprint Studios, who you may know from their previous Legend of Solgard or Rivengard, announced that they’d partnered up with Games Workshop to put out a new tactical game in the Warhammer 40,000 universe titled Warhammer 40,000... | Read more »
SwitchArcade Round-Up: ‘Pokemon Legends:...
Hello gentle readers, and welcome to the SwitchArcade Round-Up for January 28th, 2022. We’ve got a bunch of new releases to look at today, with a few big hitters, a few mid-level diversions, and a healthy supply of compost. Since it’s Friday, we... | Read more »
Phantom Blade: Executioners, S-Game...
S-Game has kicked off its first Closed Beta Test for Phantom Blade: Executioners, inviting a selected few to get first dibs on the upcoming KungFuPunk action RPG on mobile. The CBT officially begins this January 28th, and beta testers will receive... | Read more »
‘Infinite Galaxy’ First Anniversary: Cel...
Cultivating a new generation of valiant commanders across 240 countries worldwide, Infinite Galaxy has quenched players’ thirst to explore the vastness of space – and there are only more intergalactic adventures to embark on from here on out. Camel... | Read more »
War and Order: How to brave the cold in...
War and Order's 6th-anniversary celebrations are underway, and all in good time too - this season not only brings about fabulous festivities, but it also lets players experience the harsh winter in an entirely new way. [Read more] | Read more »
‘Hidden Folks+’ Is This Week’s New Apple...
The original Hidden Folks from Adriaan de Jongh is an excellent hidden objects game featuring hand drawn visuals. It is an absolute joy to play, and it has now released on Apple Arcade in the form of Hidden Folks+ () as an App Store great. If you’... | Read more »
Mini Metro’s First Big Update of 2022 Ad...
Last year saw great updates for Dinosaur Polo Club’s Mini Metro ($3.99) which is also available on Apple Arcade as an App Store Great. | Read more »

Price Scanner via MacPrices.net

Apple has clearance 2020 13″ MacBook Airs ava...
Apple has clearance, Certified Refurbished, 2020 13″ Intel-based MacBook Airs in stock today starting at only $719 and up to $370 off original MSRP. Each MacBook features a new outer case, comes with... Read more
The cheapest iPhones for sale today at Apple...
Apple has restocked Apple Certified Refurbished iPhone 8 models starting at only $359. Each refurbished iPhone comes with a fresh external case, standard Apple 1-year warranty, and free shipping.... Read more
14″ MacBook Pro with Apple M1 Max CPU now in...
Looking for a new 14″ MacBook Pro with an Apple M1 Max CPU? Stock is finally trickling into Apple resellers. B&H has Silver 14″ M1 Max MacBook Pros in stock today for $2899 including free 1-2 day... Read more
14″ MacBook Pros with Apple M1 Pro CPUs are i...
Amazon is reporting stock of 14″ MacBook Pros with M1 Pro CPUs today with a $50 discount. Shipping is free, and delivery is available by February 1st for most configurations. Be sure to make your... Read more
Apple has restocked 13″ M1 MacBook Pros for $...
Apple has restocked a full line of 13″ M1 MacBook Pros available Certified Refurbished, starting at only $1099 and up to $230 off original MSRP. These are the cheapest M1 MacBook Pros for sale today... Read more
Apple’s AirPods Max headphones are on sale fo...
Amazon has Silver, Blue, and Space Gray Apple AirPods Max headphones on sale today for $100 off MSRP. Shipping is free, and all models are in stock today. Their price is the lowest currently... Read more
Open a new line of service at Verizon and get...
Verizon is giving away 64GB Apple iPhone 12 minis or your choice of an iPhone 11 to customers who choose one of these phones and open a new line of service. Offer is available online only, and no... Read more
Open-box 13″ M1 MacBook Airs now available st...
QuickShip Electronics has open-box return 13″ M1 MacBook Airs in stock and on sale for $200-$400 off MSRP on their eBay store right now with free express delivery. According to QuickShip, “The item... Read more
Verizon’s 2022 iPad promo: $100-$310 off any...
Verizon has cellular-capable iPads on sale for $100-$310 off MSRP when purchased with an Unlimited service plan. Sale price is applied to your account monthly over a 24 or 30 month period, depending... Read more
Sunday Sale: Apple AirPods are on sale for up...
Amazon has Apple AirPods on sale for $10-$100 off MSRP today, depending on the model. All are in stock today with free delivery: – AirPods Max headphones (Blue): $449 $100 off MSRP – AirPods Max... Read more

Jobs Board

Registered Nurse (RN) Employee Health PSJH -...
…is calling for a Registered Nurse (RN) Employee Health PSJH to our location in Apple Valley, CA.** We are seeking a Registered Nurse (RN) Employee Health PSJH to be Read more
Systems Administrator - Pearson (United State...
…and troubleshoot Windows operating systems (workstation and server), laptop computers, Apple iPads, Chromebooks and printers** + **Administer and troubleshoot all Read more
IT Assistant Level 1- IT Desktop Support Anal...
…providing tier-1 or better IT help desk support in a large Windows and Apple environment * Experience using IT Service Desk Management Software * Knowledge of IT Read more
Human Resources Business Partner PSJH - Provi...
…**is calling a** **Human Resources Business Partner, PSJH** **to our location in Apple Valley, CA.** **Applicants that meet qualifications will receive a text with Read more
Manager Community Health Investment Programs...
…is calling a Manager Community Health Investment Programs PSJH to our location in Apple Valley, CA.** **Qualified candidates will be invited to do a self-paced video Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.