TweetFollow Us on Twitter

Nov 98 Tips

Volume Number: 14 (1998)
Issue Number: 11
Column Tag: Tips & Tidbits

Nov 98 Tips & Tidbits

by Jeff Clites

Strings and Numbers - The Twain Shall Meet

String and numbers are different animals, but programmers are constantly faced with the need to translate back and forth between the two. For integers, it is easy: StringToNum() and NumToString() to the job nicely. But for floating-point numbers, things get a little more tricky, because there are a myriad of choices about how to format them. Apple has provided StringToExtended() and ExtendedToString() to give you complete control over the process - too much control, you might say. Sometimes, you don't want the hassle of the page of code needed, and a simple solution would be appreciated. The classic solution in C is to use sprintf(), but this can wastefully increase the size of your executable if this is the only Standard Library function you need, and it doesn't respect localization settings. The following clever solution convinces the Apple Event Manager to do the work for you:

#include "AppleEvents.h"

OSErr ConvertDoubleToString( double inValue, AEDesc *outResult )
{
   OSErr theErr = noErr;
 
   theErr = AECoercePtr( typeFloat,            // input data type--'doub'
                  (const void *) &inValue, // pointer to input data.
                  (Size) (sizeof(double)),     // size of input data
                  typeChar,       // desired 'want' type is character
                  outResult );    // pointer to AEDesc for output data

   return theErr;                 // the error returned by the coercion.
}

The returned AEDescriptor will contain a descriptor type of typeChar ('TEXT') and a Handle to a block of text (use GetHandleSize() to determine the resulting string length). Of course, don't forget to AEDispose() the AEDescriptor returned by this call.

Stephen L. Reid
sreid@ti.com


Loading a Graphics File with QuickTime

QuickTime makes it easy to load a graphics file into an offscreen GWorld, but as simple as the process is, it can be hard to track down sample code to show you how it is done. The following simple snippet illustrates the process nicely, and has two of my favorite characteristics in a snippet: it doesn't omit error checking, and once you have looked it over it is so intuitive that you will be able to recreate it when you need it, without digging up the actual example:

FSSpec                   fsp;
ComponentInstance        gi;
Rect                     r;
ImageDescriptionHandle   idH;
GWorldPtr                outGWp;
OSErr                    errCode = noErr;

// fill in the FSSpec

if(noErr == errCode){ errCode = GetGraphicsImporterForFile(fsp, &gi); }
if(noErr == errCode){ errCode = GraphicsImportGetImageDescription(gi, &idH); }
if(noErr == errCode){
   r.left = 0;
   r.top = 0;
   r.right = (**idH).width;
   r.bottom = (**idH).height;
   errCode = NewGWorld(&outGWp,(**idH).depth, &r, nil, nil,0);
   if(noErr != errCode){
      errCode = NewGWorld(&outGWp, (**idH).depth, &r, nil, nil,
                          useTempMem);
   }
}
if(noErr == errCode){
   CGrafPtr   savePort;
   GDHandle   saveGD;

   GetGWorld(&savePort, &saveGD);
   SetGWorld(outGWp, nil);
   EraseRect(&r);                   // in case PICT has transparent areas
   GraphicsImportSetBoundsRect(gi, &r);
   GraphicsImportSetGWorld(gi, outGWp, nil);
   errCode = GraphicsImportDraw(gi);
   SetGWorld(savePort, saveGD);
}

if(noErr != errCode && nil != outGWp){  // error occurred
   DisposeGWorld(outGWp);
   outGWp = nil;
}
if(nil != idH){
   DisposeHandle(reinterpret_cast<Handle>(idH));
}
if(nil != gi){
   CloseComponent(gi);
}

If outGWp is not nil, it is a GWorld of the file.

David Phillip Oster
oster@netcom.com

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

MacFamilyTree 7.3.4 - Create and explore...
MacFamilyTree gives genealogy a facelift: it's modern, interactive, incredibly fast, and easy to use. We're convinced that generations of chroniclers would have loved to trade in their genealogy... Read more
Yummy FTP 1.10.2 - FTP/SFTP/FTPS client...
Yummy FTP is an FTP + SFTP + FTPS file transfer client which focuses on speed, reliability and productivity. Whether you need to transfer a few files or a few thousand, schedule automatic backups, or... Read more
VueScan 9.5.08 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Iridient Developer 3.0.1 - Powerful imag...
Iridient Developer (was RAW Developer) is a powerful image conversion application designed specifically for OS X. Iridient Developer gives advanced photographers total control over every aspect of... Read more
Air Video Server HD 2.1.0 - Stream video...
Air Video Server HD streams videos instantly from your computer on your iPhone, iPad, iPod touch or Apple TV. No need to worry about converting or transferring files. We took everything that was... Read more
Duplicate Annihilator 5.7.5 - Find and d...
Duplicate Annihilator takes on the time-consuming task of comparing the images in your iPhoto library using effective algorithms to make sure that no duplicate escapes. Duplicate Annihilator... Read more
BusyContacts 1.0.2 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more
Capture One Pro 8.2.0.82 - RAW workflow...
Capture One Pro 8 is a professional RAW converter offering you ultimate image quality with accurate colors and incredible detail from more than 300 high-end cameras -- straight out of the box. It... Read more
Backblaze 4.0.0.872 - 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
Little Snitch 3.5.2 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more

2K Announces WWE 2K, Mobile's First...
It seems like this month has been pretty big for wrestling. First Wrestlemania, then 2K has announces that they're releasing  WWE 2K for iOS. It's a simulation-based WWE game where you'll get to play with several WWE superstars such as John Cena, ... | Read more »
How the Apple Watch Could Change the Fac...
The Apple Watch is still a ways out, but my previous musings on the wearable’s various features got me thinking: what might it be like a year after launch? Two years? Five years? What if it becomes a symbiotic part of the iOS framework to the point... | Read more »
Pie In The Sky: A Pizza Odyssey (Games)
Pie In The Sky: A Pizza Odyssey 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: A game about delivering pizza. In space. | Read more »
Chosen Gives Hopeful Singers, Songwriter...
If YouTube videos and reality TV shows like The Voice have taught us one thing, it’s that there are a lot of people out there who are anxious to show the world their talents. And if they’ve taught us a second thing, it’s that there’s an almost... | Read more »
Android's Popular OfficeSuite Now A...
Once only available for Android devices, OfficeSuite has finally landed on the app store. The Mobile Systems app lets you view, edit, create, and share Word, Excel, and PowerPoint documents as well as convert them to/from PDFs. It's touted as being... | Read more »
Warhammer: Arcane Magic is Coming Soon,...
Turbo Tape Games has announced that they're joining forces with Games Workshop to bring the turn-based strategy board game, Warhammer: Arcane Magic, to life on the iOS. | Read more »
Fast & Furious: Legacy's Creati...
| Read more »
N-Fusion and 505's Ember is Totally...
| Read more »
These are All the Apple Watch Apps and G...
The Apple Watch is less than a month from hitting store shelves, and once you get your hands on it you're probably going to want some apps and games to install. Fear not! We've compiled a list of all the Apple Watch apps and games we've been able to... | Read more »
Appy to Have Known You - Lee Hamlet Look...
Being at 148Apps these past 2 years has been an awesome experience that has taught me a great deal, and working with such a great team has been a privilege. Thank you to Rob Rich, and to both Rob LeFebvre and Jeff Scott before him, for helping me... | Read more »

Price Scanner via MacPrices.net

Adobe Brings Powerful Layout-Design Capabilit...
Adobe today announced the availability of Adobe Comp CC, a free iPad app that enables rapid creation of layout concepts for mobile, Web and print projects. With Comp CC, designers can rough out and... Read more
Apple offering refurbished 27-inch 5K iMacs f...
The Apple Store is offering Apple Certified Refurbished 27″ 3.5GHz 5K iMacs for $2119 including free shipping. Their price is $380 off the price of new models, and it’s the lowest price available for... Read more
16GB iPad mini on sale for $199, save $50
Walmart has 16GB iPad minis (1st generation) available for $199.99 on their online store, including free shipping. Their price is $50 off MSRP. Online orders only. Read more
New 128GB MacBook Airs on sale for $50 off MS...
 B&H Photo has 128GB 11″ and 13″ 2015 MacBook Airs on sale today for $50 off MSRP including free shipping plus NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air (Model #MJVM2LL/A): $849 $50 off... Read more
13-inch 2.6GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished 13″ 2.6GHz/128GB Retina MacBook Pros available for $979 including free shipping. Original MSRP for this model was $1299. Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros 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... Read more
Samsung Galaxy S 6 and Galaxy S 6 edge U.S. P...
Samsung Electronics America, Inc. has announced the Galaxy S 6 and Galaxy S 6 edge will be available in the U.S. beginning April 10, with pre-orders being accepted now. “We have completely reimagined... 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
Save up to $80 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $80 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1019 $80 off - 21″ 2.7GHz iMac: $1189 $110 off - 21″ 2.9GHz... Read more

Jobs Board

DevOps Software Engineer - *Apple* Pay, iOS...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*Apple* Retail - Multiple Positions (US) - A...
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
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
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.