TweetFollow Us on Twitter

May 93 - WAMADA Notes

WAMADA Notes

John MacVeigh

The February WAMADA meeting was held a week late to avoid conflicting with MADACON. As a result, members who traveled to San Diego had a chance to report on the latest news from the conference. It will suffice to say that no one leapt for the phone to change their current development plans. The expected release of another MacApp update was the piece of news most immediately useful to our members. Component Software seems to be off to a good start with their plan to involve third parties in the enhancement of Component Workshop™. This could become a key weapon in their upcoming battle for market share with Symantec's Think C++. Bedrock is still on the horizon, and the viability of a single framework which provides a "native" look and feel on more than one platform remains barely tested. At the 50,000 foot level (a common Apple metaphor for "the big picture") the concept of writing frameworks to encapsulate your application's knowledge is the latest programming paradigm. Dave Wilson was the most public advocate of this idea, Taligent the most subtle.

Threads and Asynchronicity

The second part of the February meeting focused on ways of providing multiple execution paths in MacApp applications. Yvon Perreault of Cactus Inc. (a large-format color printing company) presented some sample code for the use of Apple's Threads package to provide asynchronous polling of PPC I/O completion calls. One "gotcha" with using threads is that segments can not be unloaded while a thread is executing, and since the main program is also a thread, MacApp's auto-unload feature had to be disabled.

Phil Flack of McDonnell Douglas Aerospace showed his code which provides event handling while the mouse is held down in controls. This was used to allow the monitoring of real-time devices which can transmit data to the Mac at any time. Phil overrode Button, CheckBox and Radio controls to set the control's action proc to a function which calls PollEvent during tracking. The key "trick" to making this work is to call Focus after PollEvent has returned. If the routine which is calling PollEvent is performing drawing, you need to also save off and restore the visRgn, clipRgn, and state of the fUpdating flag during the call.

Phil and coworker Mark Gerl also showed some code for a TEventHandler class called TTimedHandler which serves as an intermediary for TBehaviors on the application's idle chain. Since TBehaviors are not descended from TEventHandler, they can not directly be part of the idle chain. By using a TTimedHandler, a TBehavior can indirectly add itself to the idle chain. The TTimedHandler just passes the DoIdle call through to the TBehavior. Lastly, they described how the use of a state machine within idle methods can be used to break up processing of lengthy tasks without destroying the responsiveness of the user interface.

Affiliate Matters

The March WAMADA meeting fell four days after the infamous blizzard of '93, and squarely on Saint Patrick's Day. As a result, attendance also fell. Still, almost a dozen attendees gathered and, to start the meeting, tackled the subject of becoming an official MADA affiliate. The chief concern was that an admittance charge for non-members would drive people away, rather than encourage them to pay for membership. This lead to a discussion on how to structure MADA's fees and benefits. One proposed benefit of becoming an official affiliate is that we would receive a small share of the profits from MADA products sold at meetings. Since this is an inconvenient way to purchase software, it was suggested that a member's affiliation be recorded when they sign up, and that the affiliate get a cut from any MADA purchase which they made. Electronic access to bulletin boards is a common and often essential part of our jobs, so it was suggested that MADA establish a board on one or more of the commercial systems and limit access to members only. (Using existing systems removes the costs of billing and some administration from MADA, and provides the most widespread service). Also suggested was a more staggered fee structure, where a higher fee gains you increasing access to MADA's benefits, namely: printed information, books and software, on-line services, meetings and conferences. The question of where affiliate meetings fell in this list of services was left unanswered. Since the board member writing the affiliates rules (Leslie Jeffries) is also in charge of WAMADA, we agreed that becoming an affiliate was a good thing to do, but we wanted to see a more complete design of the implementation before making a formal declaration (typical OO programmers, huh?).

Mitem View

Our March speaker was Dan Corenzwit of Mitem Corporation. Mitem makes MitemView™, a communications product which people often associate exclusively with HyperCard. While HyperCard is the original interface for MitemView, it is no longer the only one. Now in its fourth generation, MitemView can make use of HyperCard, 4D, and C++. Note that I said "make use of" rather than "be used by". This is because Mitem considers MitemView (MV) to be a framework rather than a library. Dan credits Dave Wilson's session at MADACON for putting the difference in perspective. A library provides services which your application must determine how and when to call. A framework provides functionality that calls your application's additions at the appropriate time.

In the case of MV the functionality provided is the ability to recognize the arrival of messages and associated data from remote machines (usually mainframes) and then call your code to handle the message and its data. Its primary market is people who need to use "legacy" applications (all those mainframe COBOL applications which communicate with hardwired terminals) on their micros. Dan explained that MV views the remote system as a non-sequential, non-deterministic state machine and attempts to linearize the complexity of moving between states. MV works asynchronously (hmmm, I see a trend here!). It accepts input from a variety of communication services (SNA, TCP/IP, etc.) examines the "presentation" of the data (sort of a generalized terminal emulation) and matches incoming patterns with pre-built messages which it then sends to you. MV is able to update itself on the fly, from information provided by the sender, if a new configuration is needed to handle changes in the presentation.

To support MacApp, Mitem provides several C++ classes, along with code which is installed in your application as resources. The MV communication objects are not part of the target chain. This allows interactions with the remote machine to work in parallel with user interface activity. When MV recognizes a pattern it sends your code a message in the form of a message name. This name is turned into a method call by way of a registration table which your application builds. The result is that your application becomes a sort of way station between two users: the person running it, and the remote machine sending in data.

In combination with the previous month's discussion of handling asynchronous I/O, I found the asynchronous nature of MitemView its most interesting feature. Dan showed that responding to messages from MV in the proper order can improve response time, by taking the remote machine's processing time into account. As operating systems (including the Mac's) move towards providing multi-threading and multi-processing services, those of us who long ago became comfortable with event-based programming will have to take the next step to working with these new services. Thinking back to MADACON, I don't recall many vendors touting multi-threading as a factor in the design of their frameworks (SmalltalkAgents is the only exception that comes to mind). Let's hope this changes as fast as the new OSs change.

If you're in the D.C. area, and interested in object oriented programming, give WAMADA a visit. We meet every third Wednesday at McDonnell Douglas in Tyson's Corner, Virginia, beginning around 7:15 p.m. For a map, send a message to JEFFRIES.L on AppleLink, or call Leslie at (301) 340-5126 during business hours (EST).

 
AAPL
$99.18
Apple Inc.
-1.57
MSFT
$45.90
Microsoft Corpora
-0.46
GOOG
$568.27
Google Inc.
-9.09

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cocktail Family License (5 Macs) 7.6.1 -...
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
Cocktail 8.0 Beta 2 - General maintenanc...
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
QuickBooks 2015 16.0.0.1352 R1 - Financi...
QuickBooks 2015 helps you manage your business easily and efficiently. Organize your finances all in one place, track money going in and out of your business, and spot areas where you can save.... Read more
Mac DVDRipper Pro 5.0.1 - Copy, backup,...
Mac DVDRipper Pro is the DVD backup solution that lets you protect your DVDs from scratches, save your batteries by reading your movies from your hard disk, manage your collection with just a few... Read more
Apple OS X bash Update 1.0 - Fix for sec...
The OS X bash Update fixes a security flaw in the bash UNIX shell on OS X 10.9.5 (also on OS X 10.8 and 10.7 [see Related Links below]). OS X 10.9.5 or later Downloads for OS X 10.8 and OS X 10.7 in... Read more
SyncTwoFolders 2.0.5 - 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
FinderPop 2.5.7 - Classic Mac utility, n...
FinderPop is a Universal preference pane that extends OS X's contextual menus using a FinderPop Items folder much as the Apple Menu Items folder used to do for the Apple menu. It has other features... Read more
VueScan 9.4.45 - 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
LibreOffice 4.3.2.2 - 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
calibre 2.4 - Complete e-library managem...
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... Read more

Latest Forum Discussions

See All

RPG Soul of Deva (Games)
RPG Soul of Deva 1.0.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0.0 (iTunes) Description: SPECIAL PRICE56% OFF(USD 8.99 -> USD 3.99)!!! Demons attack humans, and humans live in fear of them...Set off on a... | Read more »
Banner Saga (Games)
Banner Saga 1.0.17 Device: iOS Universal Category: Games Price: $9.99, Version: 1.0.17 (iTunes) Description: NOTE: The Banner Saga does NOT run on iPhone 4. iPhone 4S and more modern devices recommended. | Read more »
Beatbuddy HD (Games)
Beatbuddy HD 1.0.2 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.2 (iTunes) Description: **IMPORTANT** Beatbuddy runs only on iPhone 6, 6 Plus, 5, 5c, 5s, iPad 4, iPad Mini Retina and iPad Air. | Read more »
Spirits of Spring (Games)
Spirits of Spring 1.0.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.1 (iTunes) Description: From the creators of the award-winning empathy game, Papo & Yo, comes a tale about finding strength. | Read more »
I am a brave knight (Games)
I am a brave knight 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Do you have ten minutes to live a life? | Read more »
iKeywi - Customizable 5-Row Keyboard (U...
iKeywi - Customizable 5-Row Keyboard 1.0 Device: iOS Universal Category: Utilities Price: $.99, Version: 1.0 (iTunes) Description: Want to add an extra row to your iPhone/iPad? One of the most popular keyboard extension in iOS... | Read more »
Manage Your Cloud – Wunderlist Now Suppo...
Manage Your Cloud – Wunderlist Now Supports Dropbox Posted by Jessica Fisher on October 1st, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Nexticy Review
Nexticy Review By Jennifer Allen on October 1st, 2014 Our Rating: :: IDEAL FORM CREATIONiPad Only App - Designed for the iPad Nexticy allows you to make your own forms for research purposes or to organize your business better. It’s... | Read more »
Tiny Troopers: Alliance Marches onto the...
Tiny Troopers: Alliance Marches onto the App Store Tomorrow Posted by Jessica Fisher on October 1st, 2014 [ permalink ] Tiny Troopers: Alliance, by Kukouri, is a | Read more »
HeroCraft Introduces Unlimited Sequel to...
HeroCraft Introduces Unlimited Sequel to WW2: Sandbox. Strategy & Tactics Posted by Jessica Fisher on October 1st, 2014 [ permalink ] | Read more »

Price Scanner via MacPrices.net

Logitech Type+ iPad Air Keyboard Case: Laptop...
If you want to make your iPad Air look and feel more like a laptop for productivity use, as well as protect it from impacts, spills, and scratches while on the move, the new Logitech Type+, a... Read more
ASUS, Lenovo, and Amazon Slug It Out For Tabl...
According to market intelligence firm ABI Research, Apple and Samsung have led the touchscreen tablet market by a substantial margin since Apple energized the category back in 2010. However, ABI says... Read more
Branded Tablet Growth Expected to Disappoint...
ABI Research says the 200 million annual shipments milestone for branded tablets continues to elude OEM vendors, and overall growth for 2014 is set to come in at a disappointing 2.5 percent. Apple... Read more
Amazon offers 13-inch MacBook Air for $899, $...
Amazon.com has the 13″ 1.4GHz 128GB MacBook Air on sale for $100 off MSRP including free shipping: - 13″ 1.4GHz 128GB MacBook Air: $899.99 Read more
Apple resting On Its iPhone Laurels? – The ‘B...
Apple calls its new iPhone 6 and 6 Plus “The Biggest Advancements in iPhone History,” but does reality live up to the hype? “Seldom have so many waited so breathlessly for so little,” tweeted veteran... Read more
Roundup of Apple Mac and iPad Education disco...
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 Boycotts German Magazine Computer Bild...
Apple has revoked its PR accreditation of Germany’s Computer Bild, Europe’s best-selling PC magazine, in reaction to Bild’s posting of a “#Bentgate” YouTube video. Axel Telzerow, editor in chief of... Read more
iPhone 6 & iPhone 6 Plus Available in Chi...
Apple has announced that iPhone 6 and iPhone 6 Plus will be available in China beginning Friday, October 17 from the Apple Online Store (http://www.apple.com), Apple’s retail stores, and an expansive... Read more
MacBook Airs on sale for $100 off MSRP, start...
Best Buy has the new 2014 MacBook Airs on sale for $100 off MSRP on their online store. Choose free home shipping or free local store pickup (if available). Prices valid for online orders only, in-... Read more
Apple Releases OS X Mavericks bash Update 1.0...
Apple has released a patch update for OS X Mavericks users to address the recently-detected “Shellshock” security bug in BSD UNIX’s bash shell. Apple says only a few Mac users who had manually... 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...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, 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
*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
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.