TweetFollow Us on Twitter

May 94 Tips
Volume Number:10
Issue Number:5
Column Tag:Tips & Tidbits

Related Info: Font Manager Window Mgr

Tips & Tidbits

By Scott T Boyd, Editor

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

Tip Of The Month

Counting items in a directory

Here’s a piece of code which counts the number of items in a directory. It’s particularly useful if you are going to do something to every file in a directory (and its subdirectories) and want to show a progress bar. It counts both invisible and visible items, so if you don’t want invisibles counted, you’ll need to modify it. The CountGlobals structure is used to minimize the amount of stack space used when recursively calling GetLevelCount and to hold global information that might be needed at any time.

- Jim Luther, Cupertino, CA


/* 1 */
struct CountGlobals
{
 OSErr  result;  // temp holder of results - saves 2 bytes of stack at 
each level
 Str63  itemName;// the name of the current item
 CInfoPBRec myCPB; // the parameter block used for PBGetCatInfo calls 
 
 unsigned long files;// the number of files in the directory structure 

 unsigned long directories; // the number of directories in the directory 
structure
};
typedef struct CountGlobals CountGlobals;
typedef CountGlobals *CountGlobalsPtr;
// static prototypes
static void GetLevelCount(long currentDirID, 
 CountGlobalsPtr theGlobals);
void CountDirectoryItems(short srcVRefNum, long srcDirID,
 unsigned long *files, unsigned long *directories);


static void GetLevelCount(long currentDirID, 
 CountGlobalsPtr theGlobals)
{
short index = 1; 
do {
 theGlobals->myCPB.dirInfo.ioFDirIndex = index;
 // we need to do this every time through; GetCatInfo returns ioFlNum 
in this field
 theGlobals->myCPB.dirInfo.ioDrDirID = currentDirID;     

 theGlobals->result =
 PBGetCatInfoSync((CInfoPBPtr)&theGlobals->myCPB);
 if (theGlobals->result == noErr)
 {
 if ((theGlobals->myCPB.dirInfo.ioFlAttrib & ioDirMask) != 0)
 {
 // we have a directory
 ++(theGlobals->directories);

 GetLevelCount(  theGlobals->myCPB.dirInfo.ioDrDirID,
 theGlobals);  // recurse

 theGlobals->result = noErr;// clear error return on way back
 }
 else
 {
 // we have a file
 ++(theGlobals->files);
 }
 }
 ++index;
} while (theGlobals->result == noErr);
}


void CountDirectoryItems(short srcVRefNum, 
 long srcDirID,
 unsigned long *files,
 unsigned long *directories)
{
CountGlobals theGlobals;

 theGlobals.myCPB.dirInfo.ioNamePtr = theGlobals.itemName;
 theGlobals.myCPB.dirInfo.ioVRefNum = srcVRefNum;
 theGlobals.files = 0;
 theGlobals.directories = 0;

 GetLevelCount(srcDirID, &theGlobals);

 *files = theGlobals.files;
 *directories = theGlobals.directories;
}

Spread the word about things you know that others could benefit from knowing! Send

us your tips and tidbits, especially programming-related tips. We’re also looking for user tips particularly useful to programmers .

MacTech Magazine will pay $25 for every tip used, and $50 for the Tip of the Month. You can take your award in orders or subscriptions if you prefer.

To submit a tip, send it in by e-mail. (Please make sure your code compiles). See page two for our addresses.

Popup Menus Pop Up Again

In the February issue, Laurent Haas suggested a method of forcing pop-up menus to appear in a certain font and size. His method involved forcing the system to use a new system font. I used to use this method as well, since it was the method suggested in an Apple DTS Q&A stack. Unfortunately, it has two drawbacks:

(1) It is very slow because the system has to rebuild the cached font info every time the font manager sees that LastSPExtra (the global variable at 0x0B4C) is -1. (That is why the -1 is being stuffed in there in the first place - otherwise the other changes are ignored because of the caching).

(2) It doesn’t work - no kidding... if it works consistently on a particular machine, you are very lucky. Much of the time it simply does not have the desired effect - usually the font will change, but the size won't.

The method I use now is to patch _TextFont and _TextSize immediately before calling PopupMenuSelect and then unpatch them immediately afterwards (to minimize interference with anything else that uses these traps). My patches call the original routine but with a substituted argument for the font number or size. This works consistently and has no speed penalty to speak of. After unpatching, I also need to restore the font and size of the window manager port, since the menu defproc has explicitly set them by calling TextFont(0) and TextSize(0). Because of the patches, the WMgrPort now has a font and size different from the system font and size. I set the current port to the WMgrPort and do a TextFont and a TextSize to set them back to 0. On a colour Mac, this must also be done for the Colour Window manager port as well.

This method doesn’t use any low memory globals, so is less likely to break. It does, however, require tweaking the window manager port(s), which could possibly break but I doubt it.

- Rowan Daniell, Software Engineer, Cowie Associates Ltd

Moving Targets In Mpw

With the advent of the Universal C interfaces it is a pain switching back and forth between the CIncludes and PPCCIncludes folders. Adding the following three lines to your UserStartUp-<yourname> script will make life easier:


/* 2 */
AddMenu Tools 'Use Universal CIncludes' 
 'SET CIncludes "{MPW}Interfaces:PPCCIncludes:"'

AddMenu Tools 'Use Standard CIncludes' 
 'SET CIncludes "{MPW}Interfaces:CIncludes:"'

AddMenu Tools (- ''

Any menu can be specified, but I chose to add these commands to the top of my Tools menu (which is also why I added a dividing line beneath the two items). Selecting an item causes the shell variable {CIncludes} to be set to the appropriate path. This can make life much easier when jumping between older projects and new, PowerPC-savvy projects.

- Bryan Pietrzak, Softdisk Publishing

 
AAPL
$111.78
Apple Inc.
-0.87
MSFT
$47.66
Microsoft Corpora
+0.14
GOOG
$516.35
Google Inc.
+5.25

MacTech Search:
Community Search:

Software Updates via MacUpdate

NeoOffice 2014.6 - Mac-tailored, OpenOff...
NeoOffice is a complete office suite for OS X. With NeoOffice, users can view, edit, and save OpenOffice documents, PDF files, and most Microsoft Word, Excel, and PowerPoint documents. NeoOffice 3.x... Read more
LibreOffice 4.3.5.2 - Free Open Source o...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
CleanApp 5.0.0 Beta 5 - Application dein...
CleanApp is an application deinstaller and archiver.... Your hard drive gets fuller day by day, but do you know why? CleanApp 5 provides you with insights how to reclaim disk space. There are... Read more
Monolingual 1.6.2 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. It requires a 64-bit capable Intel-based Mac and at least... Read more
NetShade 6.1 - Browse privately using an...
NetShade is an Internet security tool that conceals your IP address on the web. NetShade routes your Web connection through either a public anonymous proxy server, or one of NetShade's own dedicated... Read more
calibre 2.13 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian... Read more
Mellel 3.3.7 - Powerful word processor w...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
ScreenFlow 5.0.1 - Create screen recordi...
Save 10% with the exclusive MacUpdate coupon code: AFMacUpdate10 Buy now! ScreenFlow is powerful, easy-to-use screencasting software for the Mac. With ScreenFlow you can record the contents of your... Read more
Simon 4.0 - Monitor changes and crashes...
Simon monitors websites and alerts you of crashes and changes. Select pages to monitor, choose your alert options, and customize your settings. Simon does the rest. Keep a watchful eye on your... Read more
BBEdit 11.0.2 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more

Latest Forum Discussions

See All

Make your own Tribez Figures (and More)...
Make your own Tribez Figures (and More) with Toyze Posted by Jessica Fisher on December 19th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
So Many Holiday iOS Sales Oh My Goodness...
The holiday season is in full-swing, which means a whole lot of iOS apps and games are going on sale. A bunch already have, in fact. Naturally this means we’re putting together a hand-picked list of the best discounts and sales we can find in order... | Read more »
It’s Bird vs. Bird in the New PvP Mode f...
It’s Bird vs. Bird in the New PvP Mode for Angry Birds Epic Posted by Jessica Fisher on December 19th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Telltale Games and Mojang Announce Minec...
Telltale Games and Mojang Announce Minecraft: Story Mode – A Telltale Games Series Posted by Jessica Fisher on December 19th, 2014 [ permalink ] | Read more »
WarChest and Splash Damage Annouce Their...
WarChest and Splash Damage Annouce Their New Game: Tempo Posted by Jessica Fisher on December 19th, 2014 [ permalink ] WarChest Ltd and Splash Damage Ltd are teaming up again to work | Read more »
BulkyPix Celebrates its 6th Anniversary...
BulkyPix Celebrates its 6th Anniversary with a Bunch of Free Games Posted by Jessica Fisher on December 19th, 2014 [ permalink ] BulkyPix has | Read more »
Indulge in Japanese cuisine in Cooking F...
Indulge in Japanese cuisine in Cooking Fever’s new sushi-themed update Posted by Simon Reed on December 19th, 2014 [ permalink ] Lithuanian developer Nordcurrent has yet again updated its restaurant simulat | Read more »
Badland Daydream Level Pack Arrives to C...
Badland Daydream Level Pack Arrives to Celebrate 20 Million Downloads Posted by Ellis Spice on December 19th, 2014 [ permalink ] | Read more »
Far Cry 4, Assassin’s Creed Unity, Desti...
Far Cry 4, Assassin’s Creed Unity, Destiny, and Beyond – AppSpy Takes a Look at AAA Companion Apps Posted by Rob Rich on December 19th, 2014 [ permalink ] These day | Read more »
A Bunch of Halfbrick Games Are Going Fre...
A Bunch of Halfbrick Games Are Going Free for the Holidays Posted by Ellis Spice on December 19th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »

Price Scanner via MacPrices.net

Holiday sale: 13-inch 128GB MacBook Air for $...
 Best Buy has the 2014 13-inch 1.4GHz 128GB MacBook Air on sale for $849.99, or $150 off MSRP, on their online store. Choose free home shipping or free local store pickup (if available). Price valid... Read more
13-inch 2.6GHz Retina MacBook Pro on sale for...
Best Buy has lowered their price on the 2014 13″ 2.6GHz/128GB Retina MacBook Pro to $1149.99 on their online store for a limited time. That’s $150 off MSRP and the lowest price available for this... Read more
Kodak Returns to CES With New Consumer Produ...
Former photography colossus Kodak is returning to CES for the first time in three years where the Kodak booth (#21818 South Hall 1) will showcase a wide range of innovative, imaging-related products... Read more
Invaluable Launches New Eponymously -Named A...
Invaluable, the world’s largest online live auction marketplace, hhas announced the official launch of the Invaluable app for iPad, now available for download in the iTunes App Store. Invaluable... Read more
IDC Reveals Worldwide Mobile Enterprise Appli...
International Data Corporation (IDC) last week hosted the IDC FutureScape: Worldwide Mobile Enterprise Applications and Solutions 2015 Predictions Web conference. The session provided organizations... Read more
Hello Vino Wine App Launches “Safe Ride Home”...
Hello Vino has announced addition of a new “Get a Safe Ride Home” feature in its Food & Drink app with a direct connection to Uber, the technology platform that connects users with rides. The... Read more
DEVON-technologies Releases DEVONthink To Go...
Coeur d’Alene, Idaho based DEVON-technologies, LLC has updated DEVONthink To Go, its mobile companion to DEVONthink, to version 1.5. The update includes an iOS 8 extension, compatibility with the... Read more
The Apple Store offering free next-day shippi...
The Apple Store is now offering free next-day shipping on all in stock items if ordered before 12/23/14 at 10:00am PT. Local store pickup is also available within an hour of ordering for any in stock... Read more
It’s 1992 Again At Sony Pictures, Except For...
Techcrunch’s John Biggs interviewed a Sony Pictures Entertainment (SPE) employee, who quite understandably wished to remain anonymous, regarding post-hack conditions in SPE’s L.A office, explaining “... Read more
OtterBox Defender Series Case For iPad mini 3...
With their innovative Touch ID technology and ultrathin profile, the latest tranche of Apple iPads are more desirable than ever, and OtterBox has just announced the Defender Series custom-engineered... Read more

Jobs Board

*Apple* Store Leader Program (US) - Apple, I...
…Summary Learn and grow as you explore the art of leadership at the Apple Store. You'll master our retail business inside and out through training, hands-on experience, Read more
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and 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
*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
*Apple* Retail - Multiple Positions (US) - A...
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.