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

Apple Pro Video Formats 2.0.2 - Updates...
Apple Pro Video Formats brings updates to Apple's professional-level codes for Final Cut Pro X, Motion 5, and Compressor 4. Version 2.0.2: Includes support for the following professional video codecs... Read more
Apple Final Cut Pro X 10.2.2 - Professio...
Apple Final Cut Pro X is a professional video editing solution.Completely redesigned from the ground up, Final Cut Pro adds extraordinary speed, quality, and flexibility to every part of the post-... Read more
Apple Compressor 4.2.1 - Adds power and...
Compressor adds power and flexibility to Final Cut Pro X export. Customize output settings, work faster with distributed encoding, and tap into a comprehensive set of delivery features. Powerful... Read more
Apple Motion 5.2.2 - Create and customiz...
Apple Motion is designed for video editors, Motion 5 lets you customize Final Cut Pro titles, transitions, and effects. Or create your own dazzling animations in 2D or 3D space, with real-time... Read more
A Better Finder Rename 10.00b1 - File, p...
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
CrossOver 14.1.6 - Run Windows apps on y...
CrossOver can get your Windows productivity applications and PC games up and running on your Mac quickly and easily. CrossOver runs the Windows software that you need on Mac at home, in the office,... Read more
Printopia 2.1.14 - Share Mac printers wi...
Run Printopia on your Mac to share its printers to any capable iPhone, iPad or iPod Touch. Printopia will also add virtual printers, allowing you to save print-outs to your Mac and send to apps.... Read more
Google Drive 1.24 - File backup and shar...
Google Drive is a place where you can create, share, collaborate, and keep all of your stuff. Whether you're working with a friend on a joint research project, planning a wedding with your fiancé, or... Read more
Chromium 45.0.2454.85 - 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 45.0.2454.85: Note: Does not contain the "... Read more
OmniFocus 2.2.5 - GTD task manager with...
OmniFocus helps you manage your tasks the way that you want, freeing you to focus your attention on the things that matter to you most. Capturing tasks and ideas is always a keyboard shortcut away in... Read more

Zen Brush 2 (Entertainment)
Zen Brush 2 1.0 Device: iOS Universal Category: Entertainment Price: $2.99, Version: 1.0 (iTunes) Description: Zen Brush 2 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush. | Read more »
NetNewsWire (News)
NetNewsWire 4.0.0 Device: iOS iPhone Category: News Price: $3.99, Version: 4.0.0 (iTunes) Description: Follow the Web NetNewsWire 4, completely written from the ground up for iPhone. NetNewsWire is the best way to keep up with the... | Read more »
Huzzah! Farming Simulator 16 Supports Cl...
As though it weren't difficult enough to resist the siren call of Farming Simulator 16, now it's been updated with cloud saves - so you can jump between devices without missing any of that precious crop-harvesting time. [Read more] | Read more »
Don't Starve: Pocket Edition Finall...
I've made no effort to hide my enjoyment of Don't Starve: Pocket Edition, but I will admit I was a tiny bit disappointed that it was only available for the iPad. Well nuts to that, because Klei Entertainment has made it universal! [Read more] | Read more »
Goat Simulator Wasn't Enough? Then...
If you just didn't get enough goat in Goat Simulator - or if you've been wanting to play a simulated MMO as a microwave - then you're in luck! Goat Simulator MMO Simulator is out now, and it's a game about simulated goats in simulated MMOs. Plus... | Read more »
You Can Play Madfinger Games' Unkil...
Madfinger Games - probably best known for the Dead Trigger series - has officially launched their newest zombie shooter (that isn't called Dead Trigger), named Unkilled. [Read more] | Read more »
KORG iELECTRIBE for iPhone (Music)
KORG iELECTRIBE for iPhone 1.0.1 Device: iOS iPhone Category: Music Price: $9.99, Version: 1.0.1 (iTunes) Description: ** 50% OFF Special Launch Sale - For a Limited Time **The ELECTRIBE reborn in an even smaller form A full-fledged... | Read more »
Toca Life: City Just Got a Bunch of New...
Toca Life: City is Toca Boca's most popular app (number 1 in 47 different countries, apparently), and it's just had an update that adds a bunch of new content. [Read more] | Read more »
My Country 3D is More About Cities than...
My Country 3D is an upcoming city builder from Game Insight that looks pretty decent - although the name seems a tad out of whack for a city builder. Ah well, it is what it is. [Read more] | Read more »
I am Bread (Games)
I am Bread 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ‘I am Bread’ is the latest quirky adventure from the creators of 'Surgeon Simulator', Bossa Studios. This isn't the best thing... | Read more »

Price Scanner via MacPrices.net

Near-Office Input Functionality Virtually Any...
Today Logitech introduced the Logitech K380 Multi-Device Bluetooth Keyboard and the Logitech M535 Bluetooth Mouse, giving users the freedom to work on any device, most anywhere. According to... Read more
College Student Deals: Additional $100 off Ma...
Take an additional $100 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through September 4, 2015. Anyone with a valid .EDU email address can take... 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
Will You Buy An iPad Pro? – The ‘Book Mystiqu...
It looks like we may not have to wait much longer to see what finally materializes as a new, larger-panel iPad (Pro/Plus?) Usually reliable Apple product prognosticator KGI Securities analyst Ming-... Read more
eFileCabinet Announces SMB Document Managemen...
Electronic document management (EDM) eFileCabinet, Inc., a hosted solutions provider for small to medium businesses, has announced that its SecureDrawer and eFileCabinet Online services will be... Read more
WaterField Designs Unveils American-Made, All...
San Francisco’s WaterField Designs today unveiled their all-leather Cozmo 2.0 — an elegant attach laptop bag with carefully-designed features to suit any business environment. The Cozmo 2.0 is... Read more
Apple’s 2015 Back to School promotion: Free B...
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
128GB MacBook Airs on sale for $100 off MSRP,...
B&H Photo has 11″ & 13″ MacBook Airs with 128GB SSDs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air: $799.99, $100 off MSRP... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
27-inch 3.2GHz iMac on sale for $1679, save $...
B&H Photo has the 27″ 3.2GHz iMac on sale for $1679.99 including free shipping plus NY sales tax only. Their price is $120 off MSRP. Read more

Jobs Board

*Apple* Retail - Multiple Customer Support P...
Job Description: Customer Support Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the Read more
*Apple* Desktop Analyst - KDS Staffing (Unit...
…field and consistent professional recruiting achievement. Job Description: Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Read more
Simply Mac *Apple* Specialist- Repair Techn...
Simply Mac is the greatest premier retailer of Apple products expertise in North America. We're looking for dedicated individuals to provide personalized service and Read more
Simply Mac *Apple* Specialist- Service Repa...
Simply Mac is the greatest premier retailer of Apple products expertise in North America. We're looking for dedicated individuals to provide personalized service and Read more
*Apple* Desktop Analyst - KDS Staffing (Unit...
…field and consistent professional recruiting achievement. Job Description: Title: Apple Desktop AnalystPosition Type: Full-time PermanentLocation: White Plains, NYHot Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.