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
$102.50
Apple Inc.
+0.25
MSFT
$45.43
Microsoft Corpora
+0.55
GOOG
$571.60
Google Inc.
+2.40

MacTech Search:
Community Search:

Software Updates via MacUpdate

VueScan 9.4.41 - 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
Cloud 3.0.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
LibreOffice 4.3.1.2 - 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
SlingPlayer Plugin 3.3.20.505 - Browser...
SlingPlayer is the screen interface software that works hand-in-hand with the hardware inside the Slingbox to make your TV viewing experience just like that at home. It features an array of... Read more
Get Lyrical 3.8 - Auto-magically adds ly...
Get Lyrical auto-magically add lyrics to songs in iTunes. You can choose either a selection of tracks, or the current track. Or turn on "Active Tagging" to get lyrics for songs as you play them.... Read more
Viber 4.2.2 - Send messages and make cal...
Viber lets you send free messages and make free calls to other Viber users, on any device and network, in any country! Viber syncs your contacts, messages and call history with your mobile device,... Read more
Cocktail 7.6 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
LaunchBar 6.1 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
BBEdit 10.5.12 - Powerful text and HTML...
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

This Week at 148Apps: August 25-29, 2014
Shiny Happy App Reviews   | Read more »
Qube Kingdom – Tips, Tricks, Strategies,...
Qube Kingdom is a tower defense game from DeNA. You rally your troops – magicians, archers, knights, barbarians, and others – and fight against an evil menace looking to dominate your kingdom of tiny squares. Planning a war isn’t easy, so here are a... | Read more »
Qube Kingdom Review
Qube Kingdom Review By Nadia Oxford on August 29th, 2014 Our Rating: :: KIND OF A SQUARE KINGDOMUniversal App - Designed for iPhone and iPad Qube Kingdom has cute visuals, but it’s a pretty basic tower defense game at heart.   | Read more »
Fire in the Hole Review
Fire in the Hole Review By Rob Thomas on August 29th, 2014 Our Rating: :: WALK THE PLANKUniversal App - Designed for iPhone and iPad Seafoam’s Fire in the Hole looks like a bright, 8-bit throwback, but there’s not enough booty to... | Read more »
Alien Creeps TD is Now Available Worldwi...
Alien Creeps TD is Now Available Worldwide Posted by Ellis Spice on August 29th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Dodo Master Review
Dodo Master Review By Jordan Minor on August 29th, 2014 Our Rating: :: NEST EGGiPad Only App - Designed for the iPad Dodo Master is tough but fair, and that’s what makes it a joy to play.   | Read more »
Motorsport Manager Review
Motorsport Manager Review By Lee Hamlet on August 29th, 2014 Our Rating: :: MARVELOUS MANAGEMENTUniversal App - Designed for iPhone and iPad Despite its depth and sense of tactical freedom, Motorsport Manager is one of the most... | Read more »
Motorsport Manager – Beginner Tips, Tric...
The world of Motorsport management can be an unforgiving and merciless one, so to help with some of the stress that comes with running a successful race team, here are a few hints and tips to leave your opponents in the dust. | Read more »
CalPal Update Brings the App to 2.0, Add...
CalPal Update Brings the App to 2.0, Adds Lots of New Stuff Posted by Ellis Spice on August 29th, 2014 [ permalink ] | Read more »
Baseball Battle Review
Baseball Battle Review By Jennifer Allen on August 29th, 2014 Our Rating: :: SIMPLE HITTINGUniversal App - Designed for iPhone and iPad Simple and cute, Baseball Battle is a fairly fun baseball game for those looking for something... | Read more »

Price Scanner via MacPrices.net

Labor Day Weekend MacBook Pro sale; 15-inch m...
B&H Photo has the new 2014 15″ Retina MacBook Pros on sale for up to $125 off MSRP. Shipping is free, and B&H charges NY sales tax only. They’ll also include free copies of Parallels Desktop... Read more
Labor Day Weekend iPad mini sale; $50 to $100...
Best Buy has the iPad mini with Retina Display (WiFi models) on sale for $50 off MSRP on their online store for Labor Day Weekend. Choose free shipping or free local store pick up. Price is for... Read more
13-inch 1.4GHz MacBook Air on sale for $899,...
Adorama has the new 2014 13″ 1.4GHz/128GB MacBook Air on sale for $899.99 including free shipping plus NY & NJ tax only. Their price is $100 off MSRP. Read more
It’s Official: Apple Issues Invitations To Se...
Apple has issued one of its characteristically cryptic press invitations for a special event to be held at the Flint Center for the Performing Arts in hometown Cupertino on Sept. 9, 2014 at 10:00 am... Read more
Tablet Shipments To See First On-year Decline...
TrendForce analyst Caroline Chen notes that when the iPad launched in 2010, it was an instant hit and spurred a tablet PC revolution, with tablets so popular that that notebook PC sales stagnated and... Read more
SOBERLINK Releases Apple iOS Compatible Handh...
Cypress, California based SOBERLINK, Inc., creator of the first handheld Breathalyzer designed to improve recovery outcomes, continues to show prominence in the mobile alcohol monitoring space with... Read more
New 21″ 1.4GHz iMac on sale again for $999, s...
Best Buy has the new 21″ 1.4GHz iMac on sale for $999.99 on their online store. Their price is $100 off MSRP. Choose free shipping or free local store pick up. Price is for online orders only, in-... Read more
Smartphone Outlook Remains Strong for 2014, U...
According to a new mobile phone forecast from the International Data Corporation (IDC) Worldwide Quarterly Mobile Phone Tracker, more than 1.25 billion smartphones will be shipped worldwide in 2014,... Read more
Save up to $60 with Apple refurbished iPod to...
The Apple Store has Apple Certified Refurbished 5th generation iPod touches available starting at $149. Apple’s one-year warranty is included with each model, and shipping is free. Many, but not all... Read more
12-Inch MacBook Air Coming in 4Q14 or 2015 –...
Digitimes’ Aaron Lee and Joseph Tsai report that according to Taiwan-based upstream supply chain insiders, Apple plans to launch a thinner MacBook model either at year end 2014 or in 2015, and that... 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* 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...
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
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.