TweetFollow Us on Twitter

Nov 91 Letters
Volume Number:7
Issue Number:11
Column Tag:Letters

Strip Printing

By Kirk Chase, Editor

Larry Resestein at August BAMADA

James Plamondon

Fourth Wednesday of the month at 7PM, in the Mountain View Room of Apple’s City Center Four building, at 20450 Steven’s Creek Boulevard, Cupertino

Larry Rosenstein, MacApp wizard, was the speaker at the August BAMADA meeting where he discussed a few ideas from his book, C++ Programming with MacApp. First, he discussed filtered commands, which are described in detail in Chapter 25 of his book. The goal of the filtered command mechanism is to reduce the amount of information that one must maintain in order to undo or redo a command.

Larry gave the example of a styled text document, containing hundreds of different style runs (a little bold Times, some 9-point Zapf Chancery, a dash of italic Courier, etc. -- a real ransom-note document). If the user selected all of the document’s styled text, and set it to plain Geneva 12, saving the previous state of the document -- with all of its different styles -- could take a lot of space; in the worst case, you might have to save off the entire document.

Filtered commands solve this problem. Instead of saving the pre-change data, and then altering the document in accordance with the command, the command just installs a filter into each affected piece of data which makes it LOOK as if it has been changed. In the example above, each style run object would be filtered to look like it was plain Geneva 12. To undo the command, the filter is simply removed; to redo it, the filter is reapplied.

The mechanics of the approach are beyond the scope of this summary; besides, you can find them in Larry’s excellent book. Suffice it to say that the use of such commands simplifies the implementation of Undo/Redo significantly, and reduces the storage costs associated with it, at the cost of slightly slower data access times.

After Larry shined his light on filtered commands, he moved on to streaming. Streaming is also discussed in his book (in Chapter 22), and is a major feature of MacApp 3.0. By using streams for data I/O, one can handle input and output more abstractly; one can stream to a file or to the clipboard with equal ease.

The basic idea is that the TStream class is responsible for reading and writing bytes, or aggregates of bytes, from and to “something.” TStream’s subclasses implement the abstract methods that do the reading an writing. For example, a TFileStream would implement reading and writing to a file, while a THandleStream would implement reading and writing to a memory block. A TCountingStream wouldn’t read or write anything -- it would just count the bytes that it was told to write; this is particularly useful when trying to find out if there’s enough room on a disk to hold a file, before you actually write it out (via a TFileStream).

Larry’s book describes streaming in much more detail than this, of course, and you’ll want to look into it, as streams are used extensively in MacApp 3.0.

Article missing

MacTutor

Due to an oversight on our part, the last part of Brendan Murphy's article on Modeless SFDialogs was missing. Here is a reprint of that final section.

Conclusion

After reading this article there are probably a lot of unanswered questions. These questions are left to the reader as an exercise (I always hated that in college). I’m not going to produce a Think C version or a MacApp version. I leave this honor to some hearty soul out there. I will release a maintenance version if enough bugs or deficiencies are brought to my attention. My hope for this piece of software is that it will someday be incorporated into Apple’s system software (7.x or 8.x) and thus make this article a moot exercise for future programmers.

In the future, I plan to write more articles on TCL and perhaps MacApp. I am already “cooking up” some ideas to remove some of the short comings of TCL, but I have not yet decided which idea to pursue. Half the battle is coming up with the idea and half the battle is sticking with the idea and half the battle is implementing the idea. Yes, that adds up to 3/2 which goes to show that anything worth doing, is more work than you thought.

A Problem Stripping

Deborah E. Meadow

Cormetrics Medical Systems, Inc.

61 Barnes Park Road North

Wallingford, CT 06492-0333

(203) 265-5631

Now that the title has caught your attention, here is somthing interesting. While a the Boston MacWorld, Deborah Meadow approached me with an unsual problem. From the above address, you can see that she works for a medical group. Her problem involves printing. Some things such as EKG strips are printed in a continuous fashion, i.e. they are not spooled by the page as Mac printing is usually done. What she would like is help in creating, hopefully, a general purpose driver to do real-time, strip printing. If you have an idea, please get in touch with her at the above address.

Cheshire Keeps on Smiling

Cheshire Grin Productions Ltd.

2145 Sherobee Rd., Ste. 43

Mississauga, Ontario, Canada L5A 3G8

Cheshire Grin has just added two new additions to their Stack Enhancers product. The first addition is the Browser Palette. This allows the user/developer to navigate cards quickly and do card management, such as renaming cards; its immediate benefit is navigation for incomplete stacks. The second addition to Stack Enhancers is the Search Palette. This palette allows you to search for text on a particular stack-great for keeping a list of cards that meet the search criterea. Contact Cheshire Grin for more information.

Prospective International Software Developers

The Software Toolworks

60 Leveroni Court

Novato, CA 94949

(415) 883-3000

Planning on making a trip overseas to a trade show or just curious about the world around you? The Software Toolworks has the product for you, World Atlas. This product puts the atlas on your computer. It comes complete with over 250 detailed maps in either black & white or color. There is also a database covering information such as population, climate, national holidays, and travel documents. Sort of a one stop shop in world travel information.

BitMap Error

Kirk Chase

MacTutor

I would like to point out an error in some code published in MacTutor, November 1990 ("Special Effects") and June 1991 ("Kolorize Your B&W Application"). Basically the code in question is the offscreen bitmap allocation function used in both articles. The offending line in the procedure NewBitMap is

bm->baseAddr=NewPtr(bm->rowBytes *(long (r->right - r->left));

This assumes a height the same size as the width. Correct it to the following:

bm->baseAddr=NewPtr(bm->rowBytes *(long (r->bottom - r->top));

Thanks to Randy Frank for pointing this out.

 
AAPL
$117.60
Apple Inc.
-1.03
MSFT
$47.47
Microsoft Corpora
-0.12
GOOG
$541.08
Google Inc.
+1.81

MacTech Search:
Community Search:

Software Updates via MacUpdate

MacUpdate Desktop 6.0.3 - Discover and i...
MacUpdate Desktop 6 brings seamless 1-click installs and version updates to your Mac. With a free MacUpdate account and MacUpdate Desktop 6, Mac users can now install almost any Mac app on macupdate.... Read more
SteerMouse 4.2.2 - Powerful third-party...
SteerMouse is an advanced driver for USB and Bluetooth mice. It also supports Apple Mighty Mouse very well. SteerMouse can assign various functions to buttons that Apple's software does not allow,... Read more
iMazing 1.1 - Complete iOS device manage...
iMazing (was DiskAid) is the ultimate iOS device manager with capabilities far beyond what iTunes offers. With iMazing and your iOS device (iPhone, iPad, or iPod), you can: Copy music to and from... Read more
PopChar X 7.0 - Floating window shows av...
PopChar X helps you get the most out of your font collection. With its crystal-clear interface, PopChar X provides a frustration-free way to access any font's special characters. Expanded... Read more
Carbon Copy Cloner 4.0.3 - Easy-to-use b...
Carbon Copy Cloner backups are better than ordinary backups. Suppose the unthinkable happens while you're under deadline to finish a project: your Mac is unresponsive and all you hear is an ominous,... Read more
ForeverSave 2.1.3 - Universal auto-save...
ForeverSave auto-saves all documents you're working on while simultaneously doing backup versioning in the background. Lost data can be quickly restored at any time. Losing data, caused by... Read more
Voila 3.8.1 - Capture, annotate, organiz...
Voila is a screen-capture, recording, and annotation tool that is a full-featured replacement for Mac's screen-capture and screen-recording capabilities. It has a large and robust set of editing,... Read more
SyncTwoFolders 2.0.6 - Syncs two user-sp...
SyncTwoFolders simply synchronizes two folders. It supports synchronization across mounted network drives and it is a possibility to run a simulation showing in a log what will be done. Please visit... Read more
Duplicate Annihilator 5.1.1 - 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 detects... Read more
HandBrake 0.10.0 - Versatile video encod...
HandBrake is a tool for converting video from nearly any format to a selection of modern, widely supported codecs. Supported Sources: VIDEO_TS folder, DVD image or real DVD (unencrypted -- CSS is... Read more

Latest Forum Discussions

See All

Tilt to Live Bundle Set to Arrive This T...
Tilt to Live Bundle Set to Arrive This Thanksgiving Posted by Ellis Spice on November 25th, 2014 [ permalink ] One Man Left has unveiled an upcoming Tilt to Live bundle, allowing players to get the series for a di | Read more »
BattleLore: Command (Entertainment)
BattleLore: Command 1.0 Device: iOS Universal Category: Entertainment Price: $9.99, Version: 1.0 (iTunes) Description: ***NOTE: Compatible with iPad 2/iPad mini, iPod touch 5 and up and iPhone 4S and up – WILL NOT RUN ON EARLIER... | Read more »
Weather Or Not Review
Weather Or Not Review By Jennifer Allen on November 25th, 2014 Our Rating: :: STYLISH WEATHER REPORTINGiPhone App - Designed for the iPhone, compatible with the iPad Check the weather quickly and conveniently with Weather or Not... | Read more »
The All-New Football Manager Handheld 20...
The All-New Football Manager Handheld 2015 is Available Now Posted by Jessica Fisher on November 25th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Six iOS Games to Get You Ready for Thank...
Image Source: Friends Wiki At this point in the month, you or at least a few people you know are probably getting ready to scramble around (or are already scrambling around) for Thanksgiving Dinner. It’s a hectic day of precise oven utilization, but... | Read more »
Call of Duty: Heroes: Tips, Tricks, and...
Hello Heroes: What’d we think of Call of Duty‘s take on Clash of Clans? Check out our Call of Duty: Heroes review to find out! Just downloaded Call of Duty: Heroes and need some handy tips and tricks on how to get ahead of the rest? As we often do,... | Read more »
Call of Duty: Heroes Review
Call of Duty: Heroes Review By Jennifer Allen on November 25th, 2014 Our Rating: :: CLASH OF FRANCHISESUniversal App - Designed for iPhone and iPad Mix Clash of Clans with Call of Duty, and this is what you get.   | Read more »
Slider Review
Slider Review By Jordan Minor on November 25th, 2014 Our Rating: :: SLIDE TO PLAYUniversal App - Designed for iPhone and iPad Slider has all the excitement of unlocking your phone screen.   | Read more »
oh my giraffe (Games)
oh my giraffe 1.0.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0.0 (iTunes) Description: Eat fruits while being chased by lions. Cut the vines to send fruit plummeting onto the lions. Don't worry, your flexible... | Read more »
One of 2000’s Most Loves Adventure Games...
One of 2000’s Most Loves Adventure Games, The Longest Journey, has Come to iOS Posted by Jessica Fisher on November 25th, 2014 [ permalink ] | Read more »

Price Scanner via MacPrices.net

Early Black Friday MacBook Pro sale: 15-inch...
 Best Buy has posted early Black Friday prices on 15″ Retina MacBook Pros, with models on sale for $300 off MSRP on their online store for a limited time. Choose free local store pickup (if available... Read more
A9 Chips Already?
It’s barely more than a couple of months since Apple got the first A8 systems-on-chip into consumer hands, but rumor and news focus is already turning to the next-generation A9 SoC. Apple Daily... Read more
NewerTech Announces NuGuard KXs Impact X-Orbi...
NewerTech has announced updates to its family of Impact X-Orbing Screen Armor bringing military grade, triple layer protection to Apple’s new iPhone 6 and 6 Plus. Like all models in the NuGuard KXs... Read more
13-inch 1.4GHz MacBook Air on sale for $889,...
 B&H Photo has the 13″ 1.4GHz/128GB MacBook Air on sale for $889 including free shipping plus NY tax only. Their price is $110 off MSRP. B&H will also include free copies of Parallels Desktop... Read more
Save up to $300 on Macs and iPads with your A...
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
Apple refurbished Mac Pros available for up t...
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
Jumptuit Launches One-Tap Windows 8.1 iTunes...
Jumptuit has launched Windows 8.1 support for One-Tap iTunes Sync. with which Windows 8.1 users can now easily sync their iTunes libraries with Microsoft OneDrive. Jumptuit provides easy access from... Read more
Apple restocks refurbished 13-inch 2014 Retin...
The Apple Store has restocked Apple Certified Refurbished 2014 13″ 2.6GHz Retina MacBook Pros for up to $230 off the cost of new models. An Apple one-year warranty is included with each model, and... Read more
CEA Study Finds More People Recycling Electro...
A new study by the Consumer Electronics Association (CEA) finds that electronics recycling receives the continued and growing support of consumers. According to the CEA,s Recycling and Reuse Study,... Read more
15″ 2.2GHz Retina MacBook Pro on sale for $17...
 B&H Photo has the 2014 15″ 2.2GHz Retina MacBook Pro on sale today for $1749. Shipping is free, and B&H charges NY sales tax only. B&H will also include free copies of Parallels Desktop... Read more

Jobs Board

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