TweetFollow Us on Twitter

July 90 - Apple II Q&A

July 90 - Apple II Q&A

APPLE II DEVELOPER TECHNICAL SUPPORT

Q In the previous issue of d e v e l o p , an answer said that anyone doing a Close with reference number zero will close New Desk Accessory resource forks. Does this mean my NDA can't use resources?

A No. It means that your NDA can't open its resource fork at DAInit time and expect it to always be open. You can use resources in an NDA by opening the resource fork when your DA is opened and closing it when your DA is closed. Although an application could still close your resource fork while your DA window is open but not active, this is not likely.

Q Matt, I found your caching article to be very informative, but I'm confused about the driver level of caching. You say that if the cachePriority word on GS/OS direct page is zero, the driver should not write the block to the cache. If the block was already in the cache, won't this mean the disk has a different block than is in the cache, messing things up drastically?

A Thanks, and yes. When a driver is supposed to ignore the cache on a write call (because the cachePriority field is zero), it still must deal with the possibility that the block may already be in the cache. When writing with cachePriority zero, drivers may not add new blocks to the cache but must update blocks that are already in the cache. This step is necessary because the next time someone reads with caching enabled, the block in the cache will be returned. Next time I forget something, I promise that it will be less important.

Q I did a SelectMember2 on an extended list control, and the list was drawn at a funny place in my window. What gives?

A The current port was not set to the window that the list control was in. Most List Manager calls, and many other toolbox calls, require that the current grafPort be explicitly set. Before you call SelectMember2, set the current port to your window with a SetPort call. Remember the note in theApple IIGS Toolbox Reference, volume 2, under the NewWindow call-- "Important: NewWindow does not set the current port, but many routines require that a current port exist. Use the QuickDraw II routine SetPort to set the current port." Using SetPort can prevent toolbox confusion and reduce your debugging time.

Q Someone told me that there's an easier way of keeping track of double and triple clicks in System Software 5.0 and later. What is it?

A The extended Task Record introduced in System Software 5.0 includes a new field called wmClickCount, at offset $1C. If you're using TaskMaster in your application, set bit 19 of your wmtaskMask (the tmMultiClick bit) and TaskMaster will keep the wmClickCount field updated. Every time there is a mouse-down event within the limits set by the user in the control panel setting 'Double Click', TaskMaster will increment wmClickCount by 1. If you're interested in double or triple clicks, check wmClickCount on every mouse-down-related event. If it's at 2, then a double click was the last mouse-down result, three, it was a triple click. In fact, you can track as many closely spaced clicks as you like--quintuple, sextuple, on up--if you really want to get silly. Apple recommends not going further than triple-clicking since more clicks become quite unwieldy.

Q What the heck is the resource ID for a control color table, and why is it so hard to find in the Types.Rez interface file?

A The resource ID for control color tables is $800D, and is referenced in Types.Rez as resource name r_BBBB. It is listed under its regular name (rCtlColorTable) in Appendix E of the Apple IIGS Toolbox Reference, volume 3. The obscure name in Types.Rez and the lack of a resource structure either in Types.Rez or Appendix E is caused by the structure being variable, depending on the control type associated with the color table.

Q ACE compression and expansion don't work consistently for me. I can compress (or expand) one sound correctly, but the next time I try it the results are all wrong. What gives?

A You forgot to call ACECompBegin or ACEExpBegin between different compressions or expansions. ACE maintains information on the current operation in its direct page space to allow you to do multipart expansions or compressions. When you start working with a new sound sample, you have to call either ACECompBegin or ACEExpBegin to inform ACE that you're starting a new operation, and all the internal data should be reset. More information can be found in the ACE chapter of the Apple IIGS Toolbox Reference, volume 3.

Q Do I need to purchase APW Tools & Interfaces if I already bought Programming Tools & Interfaces for APW?

A Yes! The original Programming Tools & Interfaces utilities did not correctly support ORCA/Pascal and ORCA/C. Also, every tool in the package has been updated and enhanced. A new C library, used to build some of the tools, had bugs fixed in it (and will be available separately later). The new package also includes completely revised Apple II GS interfaces for APW C and the APW/ORCA assembler. The new APW Tools & Interfaces package is a class 1 product that may be ordered from Developer Tools Express; the previous class 2 product is no longer supported.


These questions and answers are compiled by the Apple II Developer Technical Support group. *

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Ellipsis - Touch. Explore. Survive. (...
Ellipsis - Touch. Explore. Survive. 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: | Read more »
Ys Chronicles II (Games)
Ys Chronicles II 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: After a hard fight to recover the six sacred books in Ys Chronicles I, Adol is back for a sequel! | Read more »
FINAL FANTASY Ⅸ (Games)
FINAL FANTASY Ⅸ 1.0.4 Device: iOS Universal Category: Games Price: $16.99, Version: 1.0.4 (iTunes) Description: ==========●Special sale price for the FINAL FANTASY IX release! ●20% off from February 10 to February 21, 2016... | Read more »
Tennis Club Story (Games)
Tennis Club Story 1.03 Device: iOS Universal Category: Games Price: $4.99, Version: 1.03 (iTunes) Description: Aim for the ace position of tennis club prestige in this simulation! Your leadership decides if players make it to the big... | Read more »
Juggernaut Wars guide - How to use skill...
Juggernaut Warsis a brand new auto-RPG on iOS and Android that challenges you to build a team of heroes, send them out into various different missions to defeat waves of heroes, and level them up to increase their power. The actual combat itself... | Read more »
Check out the new Pirate Attack update i...
Love pirates and board games? Well, you'll love the new Pirate Attack themed update that just launched in Game of Dice. It adds a bunch of new content themed around pirates, like an all new event map based on a pirate ship which revamps the toll... | Read more »
Splash Cars guide - How to paint the tow...
Splash Cars is an arcade driving game that feels like a hybrid between Dawn of the Plow and Splatoon. In it, you'll need to drive a car around to repaint areas of a town that have lost all of their color. Check out these tips to help you perform... | Read more »
The best video player on mobile
We all know the stock video player on iOS is not particularly convenient, primarily because it asks us to hook a device up to iTunes to sync video in a world that has things like Netflix. [Read more] | Read more »
Four apps to help improve your Super Bow...
Super Bowl Sunday is upon us, and whether you’re a Panthers or a Broncos fan you’re no doubt gearing up for it. [Read more] | Read more »
LooperSonic (Music)
LooperSonic 1.0 Device: iOS Universal Category: Music Price: $4.99, Version: 1.0 (iTunes) Description: LooperSonic is a multi-track audio looper and recorder that will take your loops to the next level. Use it like a loop pedal to... | Read more »

Price Scanner via MacPrices.net

App Annie Reveals Future of the App Economy:...
App Annie, a San Francisco based mobile app data and insights platform, has launched its first comprehensive app economy forecast. This new offering will provide brands, agencies, investors and app... Read more
Apple restocks Certified Refurbished Mac mini...
Apple has restocked Certified Refurbished 2014 Mac minis, with models available starting at $419. Apple’s one-year warranty is included with each mini, and shipping is free: - 1.4GHz Mac mini: $419 $... Read more
What iPad Pro Still Needs To Make It Truly Pr...
I love my iPad Air 2. So much that I’m grudgingly willing to put up with its compromises and limitations as a production tool in order to take advantage of its virtues. However, since a computer for... Read more
21-inch 3.1GHz 4K on sale for $1399, $100 off...
B&H Photo has the 21″ 3.1GHz 4K iMac on sale $1399 for a limited time. Shipping is free, and B&H charges NY sales tax only. Their price is $100 off MSRP: - 21″ 3.1GHz 4K iMac (MK452LL/A): $... Read more
Apple price trackers, updated continuously
Scan our Apple Price Trackers for the latest information on sales, bundles, and availability on systems from Apple’s authorized internet/catalog resellers. We update the trackers continuously: - 15″... Read more
Save up to $240 with Apple Certified Refurbis...
Apple is now offering Certified Refurbished 12″ Retina MacBooks for up to $240 off the cost of new models. Apple will include a standard one-year warranty with each MacBook, and shipping is free. The... Read more
Apple refurbished 13-inch Retina MacBook Pros...
Apple has Certified Refurbished 13″ Retina MacBook Pros available for up to $270 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 13″ 2.7GHz... Read more
Apple refurbished Time Capsules available for...
Apple has certified refurbished Time Capsules available for $120 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $179, $120 off - 3TB... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
Apple has Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.5GHz MacBook Pros... Read more
Apple refurbished 15-inch Retina MacBook Pros...
Apple has Certified Refurbished 2015 15″ Retina MacBook Pros available for up to $380 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 15″ 2... Read more

Jobs Board

Lead Engineer - *Apple* OSX & Hardware...
Lead Engineer - Apple OSX & Hardware **Job ID:** 3125919 **Full/Part\-Time:** Full\-time **Regular/Temporary:** Regular **Listed:** 2016\-02\-10 **Location:** Cary, Read more
Simply Mac *Apple* Specialist- Service Repa...
Simply Mac is the largest premier retailer of Apple products in the nation. In order to support our growing customer base, we are currently looking for a driven Read more
Infrastructure Engineer - *Apple* /Mac - Rem...
…part of a team Requires proven problem solving skills Preferred Additional: Apple Certified System Administrator (ACSA) Apple Certified Technical Coordinator (ACTC) Read more
Lead Engineer - *Apple* OSX & Hardware...
Lead Engineer - Apple OSX & Hardware **Job ID:** 3125919 **Full/Part\-Time:** Full\-time **Regular/Temporary:** Regular **Listed:** 2016\-02\-10 **Location:** Cary, Read more
*Apple* System Analyst - ATOS IT Services...
Apple System AnalystReference no.198783CountryUSARegionUS - CALIFORNIACityUS - CALIFORNIA - BURBANKPosition TypeProfessionalJob AreaIT SupportJob TypeFull Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.