TweetFollow Us on Twitter

Apr 95 Top 10
Volume Number:11
Issue Number:4
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 Steve Howard and Glenn Austin, Symantec Technical Support

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

Due to the frequency of calls and mail on the following problem, we are repeating a question published earlier.

Q: Why do derived classes of ifstream cause a bus error when they read in a stream?

A: Any class indirectly derived from the virtual base class ios needs to explicitly call the constructor for ios to initialize the data stream’s buffer. For example:

class myifstream : public ifstream {
  myifstream(char * s) : ios(&buffer), 
             ifstream(s){}
 }

Q: When I set project options for new projects, the options do not transfer to any of new projects I create. How do I get the options to remain set when I create new projects?

A: The “new project” option will only work if you remove the project model folder for new projects contained within the (Project Models) folder. The THINK Project Manager will then honor the “new project” options.

Q: I am trying to use Gestalt to find out whether the system has asynchronous SCSI abilities, or whether Quickdraw GX is present, but can’t find the right selectors to use. Where do I get this information?

A: There are some Gestalt selectors that are not in GestaltEqu.h. Lists of most known Gestalt selectors and selector codes are available at various ftp sites (see the URL page for possible sites). Once you find the selectors you need, you can add them to GestaltEqu.h, and then re-precompile your MacHeaders, MacHeaders++, and TCLHeaders with the newly-modified GestaltEqu.h.

A simpler way, if your project allows it, would be to add your new selectors into one of your own header files. This would allow you to not need to rebuild your prebuilt header files, as well as allow you to safely replace your GestaltEqu.h with a new one sometime later (without worrying about losing any of your custom-added equates).

To find the answer to your question, we went to MIDnet’s Info-Mac searcher (http://www.mid.net/INFO-MAC) and did a keyword search on gestalt. We found the following file:
ftp://ftp.hawaii.edu/mirrors/info-mac/dev/info/gestalt-selectors-27.hqx
and have excerpted a few useful lines (in Pascal terminology):

const
     gestaltGraphicsVersion = 'grfx';  {Gestalt version selector}
     gestaltSCSI            = 'scsi';  {SCSI Manager attributes}
     gestaltAsyncSCSI       = 0;       {Supports asynchronous SCSI}

The file we found has much more interesting data, so be sure to go see what other selectors might better suit your purposes.

Q: I want to use the 68881 option in my C++ project. What libraries will I need to recompile?

A: To use the 68881 option, turn on “Generate 68881” for both THINK C and C++, then rebuild the following libraries: CPlusLib, ANSI++, unix++, and IOStreams. Some libraries contain both .c and .cp files, and that’s why you’ll need to turn on the option for both C and C++.

Q: How do I get my CIconButtons to print?

A: In VA, create a new subclass of CIconButton, called CPIconButton. Change your icon buttons to type CPIconButton, then save and generate. In TPM, open CPIconButton.h, and add the following method to the class:

 virtual void DrawIcon(Boolean fHilite)
 {
     short   drawState = CalcDrawState(fHilite);

        // Set up the correct icon
     if (printing)
         cicnH = nil;
     else
         cicnH = itsCicnH[drawState];

     BlockMove(&itsIcon[drawState], &icon, kIconBytes);
     Prepare();

       // Let base class hilight only if color hilighting
    CIconPane::DrawIcon(fHilite && colorHilite);
 }

This will force the icon to draw in black & white on the printer, and it will draw correctly on the screen.

Q: I have created a subview that has a CDialogText item and I need a pointer to the item. Can you show me the easiest way to do this?

A: This is a simple two step process. First, get the ID of your CDialogText resource; these IDs are in the generated header file. The header file’s name is the subview name with the word “Items.h” appended (e.g. “SubviewItems.h”). Second, call the FindViewByID method, passing this ID.

#include “SubviewItems.h” // list of resource IDs for objects in the subview
 
CDialogText *myText;
// kMyDialogTextID is found in SubviewItems.h
myText = (CDialogText*)fMain_SubviewName->
                               FindViewByID(kMyDialogTextID);

Q: I am trying to convert a Pascal record that has a data type of Byte into a C++ structure. I am using the C type char as the equivalent of Byte. Why am I getting bizarre results?

A: The Pascal type Byte is equivalent to an unsigned char in C or C++.

Q: How do I get CTable to show only 3 columns, no matter what the size of the window?

A: To make the table show a constant number of columns, override the Draw method and resize the columns based on the current width of the window. For example:

 void CDerivedArray::Draw(Rect *area)
 {
        LongRect r;

        GetFrame(&r); // Get current frame of table pane

        static int oldWidth=0;

        int width=r.right-r.left;  //find width

        if(width!=oldWidth)  //If width hasn’t changed, don’t do anything
        {
                 int numCol=GetColCount();
                 for(int x=0;x<numCol;x++)
                 {
                          SetColWidth(x,width/numCol);
                 }

                    oldWidth=width;  //Update width
        }

         inherited::Draw(area);  //Draw table
 }

Q: I am using the default console window and want to change the foreground and background colors. Is there any way that THINK C will allow me to do that?

A: You cannot change the foreground or background colors on the default console window. You can to control some aspects of the console like the text font, size and face. You can also control how input to the console window is read. For more information on using the console window, you can refer to the Online Documentation that came with your THINK C/ Symantec C++ product or in THINK Reference under “Console Package Intro” and “Console Input Mode”.

Q: I have created a Visual Architect project, added some views and selected generate all. I have not added any of my own code but, when I try to bring the project up to date, I get an error -192 (resource not found). If I have not added code, what causes this error?

A: In VA, you will get this error if you have defined commands that have the following format in the Command Dialog:

 
   In Class:   CMain
   Do:  Open
   View:       None

When that command is generated, VA will attempt to create an Open command and associate it with an existing ‘CVue’ resource. Since you have not assigned a view to the command, there is no corresponding ‘CVue’ resource. Assign a view to the command to alleviate the problem.

Special thanks to: Kevin Quah, Chris Prinos, Scott Morison, Yuen Li, 
Kevin Irlen, Michael Hopkins, Rick Hartmann, Colen Garoutte-Carson, 
Craig Conner, Celso Barriga, and Mark Baldwin

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

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
A Better Finder Rename 9.46 - File, phot...
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
WALTR 1.0.9 - Drag-and-drop any media fi...
WALTR is designed to make it easy to upload and convert any music or video file to an iPad or iPhone format for native playback. It supports a huge variety of media file types, including MP3, MP4,... Read more
Default Folder X 4.6.14 - Enhances Open...
Default Folder X attaches a toolbar to the right side of the Open and Save dialogs in any OS X-native application. The toolbar gives you fast access to various folders and commands. You just click on... Read more
Boom 2 1.1 - System-wide pro audio app f...
Boom 2 is a system-wide volume booster and equalizer app that is designed especially for OS X 10.10 Yosemite. It comes with a smart interface, self-calibrates itself according to your Mac, offers... Read more

Legacy Quest is an Upcoming Rouge-like T...
Legacy Quest is an Upcoming Rouge-like That’ll Kill the Whole Family Posted by Jessica Fisher on February 26th, 2015 [ permalink ] Nexon Co. | Read more »
Grudgeball: Enter the Chaosphere Review
Grudgeball: Enter the Chaosphere Review By Jordan Minor on February 26th, 2015 Our Rating: :: MUSCLE MENUniversal App - Designed for iPhone and iPad Regular Show gets an above average game.   | Read more »
Action RPG League of Angels – Fire Raide...
Gaia is being invaded by the Devil Prince and the demonic Devil Army at his disposal, and it’s up to you and your avatar to defeat him in League of Angels – Fire Raiders. Raise a mighty army from hundreds of recruitable angel heroes and take the... | Read more »
Burn Rubber on the Ice With a New Cars:...
Burn Rubber on the Ice With a New Cars: Fast as Lightning Update Posted by Jessica Fisher on February 26th, 2015 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
AdVenture Capitalist Review
AdVenture Capitalist Review By Jordan Minor on February 26th, 2015 Our Rating: :: DAS KAPITALUniversal App - Designed for iPhone and iPad An inadvertent Marxist manifesto.   | Read more »
Monster vs Sheep Review
Monster vs Sheep Review By Jennifer Allen on February 25th, 2015 Our Rating: :: SAMEY FUNUniversal App - Designed for iPhone and iPad What Monster vs Sheep lacks in variety it makes up for with stress relieving fun. At least, for a... | Read more »
Is Your Face Ready for the New Outwitter...
Is Your Face Ready for the New Outwitters 2.0 Trailer? Posted by Jessica Fisher on February 25th, 2015 [ permalink ] One Man Left Studios has announced that their turn-based strategy game, | Read more »
HowToFormat Review
HowToFormat Review By Jennifer Allen on February 25th, 2015 Our Rating: :: USEFUL TIPSiPhone App - Designed for the iPhone, compatible with the iPad Making a presentation and want to get it just right? HowToFormat teaches you how... | Read more »
Thermo Diem Review
Thermo Diem Review By Jennifer Allen on February 25th, 2015 Our Rating: :: GETS TO THE POINTUniversal App - Designed for iPhone and iPad Want to know whether it’s warmer or colder tomorrow? That’s precisely what Thermo Diem will... | Read more »
Tap Heroes Review
Tap Heroes Review By Jennifer Allen on February 25th, 2015 Our Rating: :: TAPPING & GRINDINGUniversal App - Designed for iPhone and iPad Tap like crazy, grind like crazy, in this tapping game that overcomplicates the mix.   | Read more »

Price Scanner via MacPrices.net

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
Android and iOS Duopoly Owns 96.3% of Smartph...
IDC reports that Android and iOS inched closer to total domination of the worldwide smartphone market in both the fourth quarter (4Q14) and the calendar year 2014 (CY14). According to data from the... Read more
13-inch 2.4GHz Retina MacBook Pro available f...
MacMall has the 2013 13″ 2.4GHz/128GB Retina MacBook Pro available for $999.99 for a limited time. Shipping is free. Their price is $300 off original MSRP, and it’s the only sub-$1000 new Retina... Read more
Save up to $300 on a new Mac, $30 on an iPad,...
Purchase a new Mac or iPad at The Apple Store for Education 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
Mac minis available for up to $75 off MSRP
MacMall has Mac minis on sale for up to $75 off MSRP including free shipping. Their prices are the lowest available for these models from any reseller: - 1.4GHz Mac mini: $459.99 $40 off - 2.6GHz Mac... Read more
WaterField Unveils Versatile Padded Gear Pouc...
San Francisco manufacturer WaterField Design’s new Padded Gear Pouch is a light and handy-sized, yet protective, organizer for every kind of take-along gear: technology, travel, toiletries,... Read more
College Student Deals: Additional $50 off Mac...
Take an additional $50 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through April 11, 2015. Anyone with a valid .EDU email address can take advantage... Read more

Jobs Board

*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
*Apple* Solutions Consultant (ASC)- Retail S...
**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
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
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.