TweetFollow Us on Twitter

Jan 96 Top 10
Volume Number:12
Issue Number:1
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 Michael Hopkins, Symantec

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

Q: I want to be able to add files to my project, such as ReadMe files and notes, without having the project manager attempt to compile them. Is there any way to create an extension such as a .note extension in the SPM that does not use a translator?

A: Yes, there is. Quit the SPM and open your Symantec C++ folder. Copy the file «none» from your Translators folder (the one with the THINK Project Manager icon) to your (Translators) folder (the one with the Symantec Project Manager icon). With ResEdit, open the copy and choose Get Info for «none» from the File menu. Change the creator from KAHL to None. Save the file, and quit ResEdit. Now go back and launch your project in the Symantec Project Manager and choose Options from the Project menu and go to the Extensions page. Type the name of the extension that you want to use for your non-compiled source files in the File Extension edit text box. Choose «none» from the Translator popup menu, click the Add button and then click the Save button.

Adding .note to the File Extensions List

Q: When I run my program with the Symantec Debugger from the Symantec Project Manager, the source code window does not come up and the debugger palette buttons Go, Step, In, etc. are not active. What is causing this, and how can I fix it?

A: This behavior is a result of your application being compiled with incorrect 'SIZE' flags. The debugger requires that your project has Background Null Events and MultiFinder Aware checked on the Flags popup menu in the Project Type page of the Project Options dialog. Without these flags, Power Mac DebugServices will not be able to communicate with your application.

Q: I have written a brief program in the THINK Project Manager that is crashing my machine big time. The code is as follows:

typedef struct {
 int a, b;
} Foo, *FooPtr;

main()
{
 FooPtr foobuf;
 int i, size = 100;

 foobuf = (FooPtr) malloc( size*sizeof(Foo) );
 if (foobuf == NULL)
 exit(0);
 for ( i = 0; i < size; i++ )
 {
 foobuf[i].a = 0;
 foobuf.b = 0;
 }
}

Why is this causing me so much trouble? Is something wrong with malloc?

A: No, malloc is not at fault. By not including <stdio.h> and <stdlib.h>, your compiler does not have a function prototype for malloc, so it is guessing (incorrectly) about the size of the argument to malloc. Instead of using the type size_t, it is assuming an int. To avoid this problem, always choose Require Prototypes on the Language Settings page of your THINK C Options dialog. With that option selected, this would have resulted in a compilation error instead of a runtime error.

Q: Can I use Quickdraw GX with TCL and VA?

A: Yes, it is possible. For starters, initialize Quickdraw GX in CApp::ICApp() in the following manner:


void  CApp::ICApp()
{
 Ix_CApp(4, 24000L, 20480L, 2048L);
 
    // Initialize your own application data here.

 long graphicsHeapSize = 375; // about 25K

 theGXClient = GXNewGraphicsClient( nil, gGraphicsHeapSize *   1024L, 
0L );
 FailNIL( theGXClient );
 GXEnterGraphics();
 
 assert (GXGetGraphicsError( nil ) !=  out_of_memory);   
 // etc.
}

You will need to declare theGXClient as a member function of CApp of type gxGraphicsClient and include the proper header files in CApp.cp. Additionally, it is a good idea to override CApplication::InspectSystem() to check for the presence of QuickDraw GX. It is considered programmer error to call GX routines without verifying via Gestalt() that GX is present. Finally, override CApplication::Exit() in CApp using the following example:

 void CApp::Exit( )
 {
 GXExitGraphics();
 GXDisposeGraphicsClient( myGXClient );
    // etc...
 x_CApp::Exit();
 }

Q: Why does printf crash when I use it in a TCL project? Is there any way to use TCL in conjunction with the console?

A: Yes, there is. The console package does some special initialization that needs to be done in place of the standard toolbox initialization that TCL does. To use the console with TCL, you should override CApplication::InitToolbox(), like this:

 void CApp::InitToolbox( void )
 {
 cout<< "Initialize console package"<<endl;
 }

The call to cout in place of the standard CApplication::InitToolbox() will initialize the toolbox and the console package. This will enable the use of printf and iostreams routines with the console window. Note: You will need to add the IOStreams library and replace ANSI_small with ANSI.

Q: How do I make an application (or the Project Manager) multi-session, so I can throw it on a server and have several users run the application off of the server at the same time?

A: Use ResEdit to open the application you want to share. From the File menu, choose Get File Info for the application, and click the Sharable flag. Save the application, and Quit ResEdit. Your application can now be used by multiple users simultaneously.

Q: I am working on an application that prompts the user for a password. I need to be able to filter the edit text so that it displays bullet characters instead of the actual password. Is there an easy way to do this in VA?

Example of an Application that uses a Password Edit Text Filter

A: Yes. You must first create a derived class from CDialogText in VA. Then override the DoKeyDown() method in the following manner:

void  cPasswordText::DoKeyDown( char theChar, Byte keyCode,
   EventRecord *macEvent )
{
 Boolean pass = TRUE;
 short  ID;
 Str255 textString;

 switch (theChar)
 {
 case TCL_CR:
 case '\t':
 case kEnterKey:
 pass = FALSE;
 break;
 case kEscapeOrClear:
 if (keyCode == KeyEscape) pass = FALSE;
 break;
 default:
 GetTextString( textString );
 if ( !  isalnum( theChar ))// pass spaces and delete keys
 {
 inherited::DoKeyDown( theChar, keyCode, macEvent );
 pass = false;
 } 
 }
 if (pass)
 {
 textString[0]++;
 textString[textString[0]] = ‘•’;
 SetTextString( textString );
 
// add code to store actual characters typed here

 if (itsTypingTask && itsTypingTask->CanStillType())
 {
 ID = this->ID;
 BroadcastChange(dialogTextChanged, &ID);
 }
 }
 else
 itsSupervisor->DoKeyDown(theChar, keyCode, macEvent);
}

Q: Can I use STL with Symantec C++?

A: Yes, Symantec C++ supports a modified version of STL. For best results, you need to use 8.0.3 of our Symantec C++ compiler. Patches are available via anonymous ftp at ftp://devtools.symantec.com/updaters/sym.cpp-va-tcl.update.

Q: I’m using your new Pascal Universal Headers for THINK Pascal and I get pages of link errors. Why is this?

A: When you use our Universal Headers, you need to make sure that you have the proper uses statements for the toolbox routines that you are using. You can no longer rely on the correct uses being used automatically. You will need to be very conscious of which interface file you use. See the Readme for further details.

Q: I call the Place() method of a CPanorama object I have created in the Main view using VA, but nothing happens. Place() works fine for other objects derrived from CPane. What gives?

A: Place(), inherited from CPane, sets the data members hEncl and vEncl, which indicate the pane’s position relative to itsEnclosure. In the case of CIconButton, for instance, itsEnclosure will be the itsMainPane member of the Document (itsMainPane is the CPanorama object that acts as the background of every view of type Main Window). Hence, calling the Place() member of a CIconButton visibly moves the button relative to the window. In the case of a CPanorama object however, itsEnclosure is actually itsScrollPane. A panorama’s Place() function will not visibly change its postion. You should instead call itsScrollPane-> Place() to move a panorama relative to the window.

If you have a question or topic for a future Top Ten article, please send us your ideas. If you have found an answer to an obscure problem that has been eluding you, or you have a stumper, send it to topten@devtools.symantec.com. If we choose to use your question in our column, your submission will be immortalized in print, and we will mail you a cool Symantec T-shirt.

Special thanks to: Glenn Austin, Mark Baldwin, Levi Brown, Craig Conner, Andy McFarland, Christopher Prinos, and Kevin Quah.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

The Slaughter: Act One (Games)
The Slaughter: Act One 1.0.323 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.323 (iTunes) Description: “The game mixes realism and surrealism to create a story that can cause just as much laughter as fear. A-” -... | Read more »
NEO TURF MASTERS (Games)
NEO TURF MASTERS 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: NEOGEO’s legendary golf game is back, in a brand-new mobile version with touch controls! NEO TURF MASTERS (also known as “BIG... | Read more »
How to send money to a friend with the F...
Facebook is already a lot of things to a lot of people. It's a social network, sure, but also a tool for catologing memories, chatting with friends, and much more. [Read more] | Read more »
Branch out into the Chinese market with...
Created a game that you’re super enthused about, only to find yourself struggling to get it the exposure that you believe it duly deserves? With the time, energy and money that goes into development, it’s only right that games should be given the... | Read more »
Pocket Arcade Story (Games)
Pocket Arcade Story 1.00 Device: iOS Universal Category: Games Price: $4.99, Version: 1.00 (iTunes) Description: Here comes a new challenger: it's the arcade simulation game you've been waiting for! Build your very own gaming... | Read more »
How to get coins faster in Rodeo Stamped...
There comes a time in a cowboy or cowgirl's life when all the riding and lassoing skills in the world aren't enough. You're going to need some cold, hard cash to keep your sky zoo expanding in Rodeo Stampede. [Read more] | Read more »
How to out-do Cam Newton in Can You Dab?
The thing about dance crazes is that you're never really sure when they've run their course. Take the Dab, for instance. Propelled by its adoption as the touchdown celebration of choice for Carolina Panthers quarterback Cam Newton, the Dab seemed... | Read more »
Artik Games releases Splashy Cats for An...
Splashy Cats had us hooked from the title alone, and when we found out the game was literally just zig-zagging one of our favourite pop-culture references, guised as a playable cat character, down a river – our appetites were whetted to say the... | Read more »
Battle Cars (Games)
Battle Cars 1.1 Device: iOS Universal Category: Games Price: $1.99, Version: 1.1 (iTunes) Description: Welcome to the world of Battle Cars. Battle Cars is a classic arcade top-down racing game with fast mini cars and funny weapons to... | Read more »
How to get started with live.ly
One could be forgiven for thinking that there are already plenty of streaming video apps out there. It's just that the App Store charts would insist that you're mistaken. [Read more] | Read more »

Price Scanner via MacPrices.net

9-inch 128GB Silver iPad Pro on sale for $50...
B&H Photo has the 9.7″ 128GB Silver Apple iPad Pro on sale for $699 including free shipping plus NY tax only. Their price is $50 off MSRP. Read more
Why Use Indie Opera And Vivaldi Instead Of Sa...
For many years my web browser workhorses were various permutations and spinoffs of the Netscape/Mozilla/Firefox Open Source platform, and the Norwegian indie browser Opera, which I took a shine to... Read more
Western Digital Launches Worlds Fastest 256GB...
At the Mobile World Congress in Shanghai Western Digital Corporation this week introduced a new suite of 256 gigabyte (GB) microSD cards, which includes the new 256GB SanDisk Extreme microSDXC UHS-I... Read more
KeyCue 8.1 Integrates With Typinator To Displ...
Ergonis Software has released KeyCue 8.1, a new version of the company’s keyboard shortcut cheat sheet. KeyCue 8 introduced a new way to define a wide variety of triggers, which can be used to... 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
21-inch 2.8GHz iMac on sale for $1199, save $...
Amazon has the 21″ 2.8GHz iMac (model #MK442LL/A) on sale for $1199.99 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Read more
13-inch 2.5GHz MacBook Pro (Apple refurbished...
Apple has 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″ 2.5GHz MacBook Pros... Read more
MacBook Airs on sale for up to $50-$100 off M...
B&H Photo has 13″ and 11″ MacBook Airs on sale for up to $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air: $849 $50 off list price - 11″ 1.... Read more
Brexit Vote Result Forecast To Slash UK 2016...
Uncertainty and economic volatility can be expected to increase over the next nine months, as the Brexit and concerns over the future of the EU hit IT investment, say Canalys market analysts, with... Read more
13-inch 256GB MacBook Air on sale for $1149,...
Amazon has the 2016 13″ 1.6GHz/256GB MacBook Air (model MMGG2LL/A) on sale for $1149.99 including free shipping. Their price is also $50 off MSRP. Read more

Jobs Board

*Apple* Retail - Multiple Positions - Apple,...
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* iPhone 6s and New Products Tester Ne...
…we therefore look forward to put out products to quality test for durability. Apple leads the digital music revolution with its iPods and iTunes online store, Read more
*Apple* iPhone 6s and New Products Tester Ne...
…we therefore look forward to put out products to quality test for durability. Apple leads the digital music revolution with its iPods and iTunes online store, Read more
*Apple* iPhone 6s and New Products Tester Ne...
…we therefore look forward to put out products to quality test for durability. Apple leads the digital music revolution with its iPods and iTunes online store, Read more
*Apple* Retail - Multiple Positions, Willow...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.