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.

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

MacFamilyTree 8.2.5 - Create and explore...
MacFamilyTree gives genealogy a facelift: modern, interactive, convenient and fast. Explore your family tree and your family history in a way generations of chroniclers before you would have loved.... Read more
Hopper Disassembler 4.3.2- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
MacFamilyTree 8.2.5 - Create and explore...
MacFamilyTree gives genealogy a facelift: modern, interactive, convenient and fast. Explore your family tree and your family history in a way generations of chroniclers before you would have loved.... Read more
Hopper Disassembler 4.3.2- - Binary disa...
Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32- and 64-bit executables. It will let you disassemble any binary you want, and provide you all the information about its... Read more
GraphicConverter 10.5.1 - $39.95
GraphicConverter is an all-purpose image-editing program that can import 200 different graphic-based formats, edit the image, and export it to any of 80 available file formats. The high-end editing... Read more
Delicious Library 3.7 - Import, browse a...
Delicious Library allows you to import, browse, and share all your books, movies, music, and video games with Delicious Library. Run your very own library from your home or office using our... Read more
Adobe Animate CC 2017 18.0.0.107 - Anima...
Animate CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Flash Professional customer). Animate CC 2018 (was Flash CC) lets you... Read more
Adobe After Effects CC 2018 15.0 - Creat...
After Effects CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous After Effects customer). The new, more connected After Effects CC... Read more
Adobe Premiere Pro CC 2018 12.0.0 - Digi...
Premiere Pro CC 2018 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Premiere Pro customer). Adobe Premiere Pro CC 2018 lets you edit... Read more
Alarm Clock Pro 10.3 - $19.95
Alarm Clock Pro isn't just an ordinary alarm clock. Use it to wake you up in the morning, send and compose e-mails, remind you of appointments, randomize the iTunes selection, control an internet... Read more

Darts of Fury guide - how to rise in the...
Darts of Fury is a new, immensely absorbing darts game from indie studio Yakuto. It's darts in its purest form, but collectible darts and other upgrades give this game an addictive edge that's hard to shake. As your progress out of the beginner... | Read more »
ICEY (Games)
ICEY 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: ICEY is a 2D side-scrolling action game. As you follow the narrator's omnipresent voice, you will see through ICEY's eyes and learn the... | Read more »
The best new games we played this week -...
We've made it, folks. Another weekend is upon us. It's time to sit back and relax with the best new releases of the week. Puzzles, strategy RPGs, and arcade games abound this week. There's a lot of quality stuff to unpack this week, so let's hop... | Read more »
Wheels of Aurelia (Games)
Wheels of Aurelia 1.0.1 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.1 (iTunes) Description: | Read more »
Halcyon 6: Starbase Commander guide - ti...
Halcyon 6 is a well-loved indie RPG with stellar tactical combat and some pretty good writing, too. It's now landed on the App Store, so mobile fans, if you're itching for a good intergalactic adventure, here's your game. Being a strategy RPG, the... | Read more »
Game of Thrones: Conquest guide - how to...
Fans of base building games might be excited to know that yet another entry in the genre has materialized - Game of Thrones: Conquest. Yes, you can now join the many kingdoms of the famed book series, or create your own, as you try to conquer... | Read more »
Halcyon 6: Starbase Commander (Games)
Halcyon 6: Starbase Commander 1.4.2.0 Device: iOS Universal Category: Games Price: $6.99, Version: 1.4.2.0 (iTunes) Description: An epic space strategy RPG with base building, deep tactical combat, crew management, alien diplomacy,... | Read more »
Legacy of Discord celebrates its 1 year...
It’s been a thrilling first year for fans of Legacy of Discord, the stunning PvP dungeon-crawling ARPG from YOOZOO Games, and now it’s time to celebrate the game’s first anniversary. The developers are amping up the festivities with some exciting... | Read more »
3 reasons to play Thunder Armada - the n...
The bygone days of the Battleship board game might have past, but naval combat simulators still find an audience on mobile. Thunder Armada is Chinese developer Chyogames latest entry into the genre, drawing inspiration from the explosive exchanges... | Read more »
Experience a full 3D fantasy MMORPG, as...
Those hoping to sink their teeth into a meaty hack and slash RPG that encourages you to fight with others might want to check out EZFun’s new Eternity Guardians. Available to download for iOS and Android, Eternity Guardians is an MMORPG that lets... | Read more »

Price Scanner via MacPrices.net

Save $100 on 13″ MacBook Airs, prices start a...
Adorama has 2017 13″ MacBook Airs on sale today for $100 off MSRP including free shipping. Adorama charges NY & NJ sales tax only: – 13″ 1.8GHz/128GB MacBook Air (MQD32LL/A): $899, $100 off MSRP... Read more
1.4GHz Mac mini available for $399, $100 off...
TigerDirect has the 1.4GHz Mac mini on sale today for $399 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Although currently out of stock,... Read more
21″ 2.3GHz iMac on sale for $999, save $100
MacMall has the 21″ 2.3GHz iMac (MMQA2LL/A) on sale today for $999 including free shipping. Their price is $100 off MSRP, and it’s the lowest price available for this model. Read more
12″ iPad Pros on sale for $50 off MSRP, no ta...
Adorama has 12″ iPad Pros on sale today for $50 off MSRP. Shipping is free, and Adorama charges sales tax in NY & NJ only: – 12″ 64GB iPad Pro: $749, save $50 – 12″ 256GB iPad Pro: $899, save $50... Read more
9″ iPads on sale for $30 off, starting at $29...
MacMall has 9″ iPads on sale for $30 off including free shipping: – 9″ 32GB iPad: $299 – 9″ 128GB iPad: $399 Read more
Apple restocks full line of refurbished 13″ M...
Apple has restocked a full line of Apple Certified Refurbished 2017 13″ MacBook Pros for $200-$300 off MSRP. A standard Apple one-year warranty is included with each MacBook, and shipping is free.... Read more
13″ 3.1GHz/256GB MacBook Pro on sale for $167...
Amazon has the 2017 13″ 3.1GHz/256GB Space Gray MacBook Pro on sale today for $121 off MSRP including free shipping: – 13″ 3.1GHz/256GB Space Gray MacBook Pro (MPXV2LL/A): $1678 $121 off MSRP Keep an... Read more
13″ MacBook Pros on sale for up to $120 off M...
B&H Photo has 2017 13″ MacBook Pros in stock today and on sale for up to $120 off MSRP, each including free shipping plus NY & NJ sales tax only: – 13-inch 2.3GHz/128GB Space Gray MacBook... Read more
15″ MacBook Pros on sale for up to $200 off M...
B&H Photo has 15″ MacBook Pros on sale for up to $200 off MSRP. Shipping is free, and B&H charges sales tax in NY & NJ only: – 15″ 2.8GHz MacBook Pro Space Gray (MPTR2LL/A): $2249, $150... Read more
Roundup of Apple Certified Refurbished iMacs,...
Apple has a full line of Certified Refurbished 2017 21″ and 27″ iMacs available starting at $1019 and ranging up to $350 off original MSRP. Apple’s one-year warranty is standard, and shipping is free... Read more

Jobs Board

Project Engineer, *Apple* Education Profess...
Project Engineer, Apple Education Professional Services Job Number: 113143353New York City, New York, United StatesPosted: Oct. 17, 2017Weekly Hours: 40.00 Job Read more
Commerce Software Engineer, *Apple* Media P...
Commerce Software Engineer, Apple Media Products Job Number: 113092072New York City, New York, United StatesPosted: Oct. 19, 2017Weekly Hours: 40.00 Job Summary With Read more
Engineering Manager, *Apple* Retail Enginee...
# Engineering Manager, Apple Retail Engineering Job Number: 58139948 Santa Clara Valley, California, United States Posted: 20-Oct-2017 Weekly Hours: 40.00 **Job Read more
*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
Commerce Engineer, *Apple* Media Products -...
Commerce Engineer, Apple Media Products (New York City) Job Number: 113028813New York City, New York, United StatesPosted: Sep. 20, 2017Weekly Hours: 40.00 Job Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.