TweetFollow Us on Twitter

May 93 - 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).


Community Search:
MacTech Search:

Software Updates via MacUpdate

World of Tanks Generals guide - Tips and...
World of Tanks Generals is a brand new card game by the developer behind the World of Tanks shooter franchise. It plays like a cross between chess and your typical card game. You have to keep in consideration where you place your tanks on the board... | Read more »
TruckSimulation 16 guide: How to succeed...
Remember those strangely enjoyable truck missions in Grand Theft Auto V whereit was a disturbing amount of fun to deliver cargo? TruckSimulation 16 is reminiscent of that, and has you play the role of a truck driver who has to deliver various... | Read more »
The best GIF making apps
Animated GIFs have exploded in popularity recently which is likely thanks to a combination of Tumblr, our shorter attention spans, and the simple fact they’re a lot of fun. [Read more] | Read more »
The best remote desktop apps for iOS
We've been sifting through the App Store to find the best ways to do computer tasks on a tablet. That gave us a thought - what if we could just do computer tasks from our tablets? Here's a list of the best remote desktop apps to help you use your... | Read more »
Warhammer 40,000: Freeblade guide - How...
Warhammer 40,000: Freebladejust launched in the App Store and it lets you live your childhood dream of blowing up and slashing a bunch of enemies as a massive, hulking Space Marine. It's not easy being a Space Marine though - and particularly if... | Read more »
Gopogo guide - How to bounce like the be...
Nitrome just launched a new game and, as to be expected, it's a lot of addictive fun. It's called Gopogo, and it challenges you to hoparound a bunch of platforms, avoiding enemies and picking up shiny stuff. It's not easy though - just like the... | Read more »
Sago Mini Superhero (Education)
Sago Mini Superhero 1.0 Device: iOS Universal Category: Education Price: $2.99, Version: 1.0 (iTunes) Description: KAPOW! Jack the rabbit bursts into the sky as the Sago Mini Superhero! Fly with Jack as he lifts impossible weights,... | Read more »
Star Wars: Galaxy of Heroes guide - How...
Star Wars: Galaxy of Heroes is all about collecting heroes, powering them up, and using them together to defeat your foes. It's pretty straightforward stuff for the most part, but increasing your characters' stats can be a bit confusing because it... | Read more »
The best cooking apps (just in time for...
It’s that time of year again, where you’ll be gathering around the dinner table with your family and a huge feast in front of you. [Read more] | Read more »
Square Rave guide - How to grab those te...
Square Rave is an awesome little music-oriented puzzle game that smacks of games like Lumines, but with its own unique sense of gameplay. To help wrap your head around the game, keep the following tips and tricks in mind. [Read more] | Read more »

Price Scanner via

13-inch 128GB MacBook Air now on sale for $79...
Best Buy has just lowered their price on the 2015 13″ 1.6GHz/128GB MacBook Air to $799.99 on their online store for Cyber Monday. Choose free shipping or free local store pickup (if available). Sale... Read more
Best Buy lowers 13-inch MacBook Pro prices, n...
Best Buy has lowered prices on select 13″ MacBook Pros this afternoon. Now save up to $200 off MSRP for Cyber Monday on the following models. Choose free shipping or free local store pickup (if... Read more
Cyber Monday: Apple MacBooks on sale for up t...
Apple resellers have MacBook Pros, MacBook Airs, and MacBooks on sale for up to $250 off MSRP for Cyber Monday 2015. The following is a roundup of the lowest prices available for new models from any... Read more
Cyber Monday: Apple Watch on sale for up to $...
B&H Photo has the Apple Watch on sale for Cyber Monday for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - Apple Watch Sport: $50 off - Apple Watch: $50-$100 off B... Read more
Cyber Monday: 15% off Apple products, and sto...
Use code CYBER15 on Cyber Monday only to take 15% on Apple products at Target, and store-wide. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-... Read more
iPad Air 2 And iPad mini Among Top Five Black...
Adobe has released its 2015 online shopping data for Black Friday and Thanksgiving Day. The five best selling electronic products on Black Friday were Samsung 4K TVs, Apple iPad Air 2, Microsoft Xbox... Read more
All-in-one PC Shipments Projected To Drop Ove...
Digitimes’ Aaron Lee and Joseph Tsai report that all-in-one (AIO) PC shipments may drop a double-digit percentage on-year in 2015 due to weaker-than-expected demand, although second-largest AIO make... Read more
Sprint Offers iPad Pro
Sprint now offers Apple’s new iPad Pro with Wi-Fi + Cellular, featuring a 12.9-inch Retina display with 5.6 million pixels. Customers can pick up iPad Pro at select Sprint retail locations. It can... Read more
Cyber Monday: Target offers 15% discount on A...
Target has discounted Apple Watches by 15% for Cyber Monday. Choose free shipping or free local store pickup (if available). Sale prices for online orders only, in-store prices may vary: - Apple... Read more
Sunday roundup of Holiday weekend Mac sales:...
Take up to $500 off MSRP on the price of a new Mac at B&H Photo today as part of their Black Friday/Holiday weekend sale. Shipping is free, and B&H charges NY tax only. These prices are... Read more

Jobs Board

*Apple* Site Security Manager - Apple (Unite...
# Apple Site Security Manager Job Number: 42975010 Culver City, Califo ia, United States Posted: Oct. 2, 2015 Weekly Hours: 40.00 **Job Summary** The Apple Site Read more
iOS Wallet & *Apple* Pay Engineer - App...
# iOS Wallet & Apple Pay Engineer Job Number: 40586801 Santa Clara Valley, Califo ia, United States Posted: Nov. 16, 2015 Weekly Hours: 40.00 **Job Summary** The iOS Read more
*Apple* Online Store Expansion - Apple (Unit...
# Apple Online Store Expansion Job Number: 41191932 Santa…1, 2015 Weekly Hours: 40.00 **Job Summary** The Online Apple Store is seeking a person to lead its Read more
Software Engineer, *Apple* Watch - Apple (U...
# Software Engineer, Apple Watch Job Number: 38181776 Santa Clara Valley, Califo ia, United States Posted: Nov. 2, 2015 Weekly Hours: 40.00 **Job Summary** The Apple Read more
Technical Program Manager, Strategic Merchant...
# Technical Program Manager, Strategic Merchants - Apple Pay Job Number: 44001177 Santa Clara Valley, Califo ia, United States Posted: Oct. 30, 2015 Weekly Hours: 40.00 Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.