TweetFollow Us on Twitter

Aug 89 Letters
Volume Number:5
Issue Number:8
Column Tag:Letters

Letters

By David E. Smith, Editor & Publisher, MacTutor

Font Tool

Fabien Samuel

Paris, France

As always I read the March issue of your magazine with pleasure and interest. I would like to share a comment about Randy Leonard’s article, “How To Write a Font Tool for MPW”. To start with, all my congratulations for giving a very clear presentation of the matter. I think anybody who reads the article now has all the material to easily start writing his own MPW tools. I just have a comment about the use of SetResLoad(false): as stated in IM, you should SetResLoad(true) as soon as possible after calling SetResLoad(false), or you may be asking for trouble. Although there is no problem in Randy’s program if it has a normal exit, it seems SetResLoad(true) will not be called when the program terminates on an error condition, and this might be a problem.

It appears the only call in the program that might trigger Resource loading is GetFNum, so I would personally bracket this call with SetResLoad(false) and SetResLoad(true). In that case SetResLoad(true) isn’t even needed, because GetFNum automatically calls it before returning (IM I - 223).

Resource Fork Problem

Paul Onstad

St. Paul, MN

I enjoy your articles of Pascal code but have never come across an example which would lead me out of the problem that has stopped my application dead in its tracks.

1. I wish to maintain data in both forks of an applications HFS data file.

2. HFS provides only one Resource Manager call which considers the location of the file for subsequent resource calls, i.e., OpenRFPerm.

3. However, when the user performs a “Save” or “Save as ” the existing file must be erased with FSDelete. Create then follows to create both forks of the file and the revised data is written to the data fork. The previous resource fork data is temporarily saved in memory by the application. The resource fork of the new file is now empty.

4. After the new data fork has been filled. A call to OpenRFPerm is made to open the empty resource fork with the intention of using AddResource to place the memory-saved resource data back into the revised file. But, OpenRFPerm returns an unsuccessful “-1” because of ResError -39 (logical eof encountered on the empty resource fork).

Without a valid refNum from OpenRFPerm there appears to be no way to communicate back to the application the location (folder, etc.) in which the resource data should be restored on disk. The existing refNum was lost because the resource fork had to be closed before FSDelete--otherwise the file was “busy” and could not be deleted.

Additional (if of some use): DetachResource was used just before the file was erased in order to hold the resource data in memory while the actual resource (and data) file was deleted.

If you can provide any examples or information, it would greatly be appreciated.

MIDI Problems

John Kaplan

Chicago, IL

I have been following your articles in MacTutor for some time, but have only recently been able to try your MIDI routines. I was hoping you wouldn’t mind a few comments and questions that came up for me as I worked.

First, I know your code was meant for the MDS assembler and LSP version 1, but I was using MPW for assembly, and had to use LSP version 2. (Version 1 cannot link MPW object files.) I found that LSP v2 would not accept an MPW object file with DC’s in it so I declared all the variables as IMPORT’s in the assembler, and as variables of corresponding types in the LSP interface file. I didn’t really understand why people objected to the use of A5 variables in the first place (since if your going to use MIDI in an application you’re going to have to have space for your data somewhere anyway ) but that’s not the point. The point is that after framing everything in PROC and ENDPROC directives for MPW and moving the blocks around to avoid forward references, the whole thing compiled and linked fine. The only other thing worth mentioning is that MPW assumes when a variable is imported that it is referenced through A5, so there are no explicit A5 references for the variables. (You probably know all this already, but I mentioned it just in case.)

The next snag I ran into was in testing the routines in LSP I wrote a little program that writes incoming MIDI information in the LSP text window. This was a big mistake, as LSP v2 seems to reserve the right to move your code around in memory as it calls graphic operations to update it’s text window. After the ten or fifteen crashes it took me to figure this out, I rewrote my code so I made my own window, and drew the MIDI information in with drawstring. (And locked the CODE resource for the LSP project in ResEdit, just to be on the safe side.) Finally RxMIDIA worked like a charm.

Then I wrote a simple sequence in my test program that sends a note on, then a note off for the same note. This just doesn’t work, and try as I might, I can’t find what’s wrong. I’ve been over my code 5 times and can’t find a typing mistake, and I don’t have the expertise in interrupts or serial chips to know exactly what’s going on to debug it. I was thinking there might be another compatibility problem with LSP v2, or a problem with porting the assembly code from MDS to MPS that I don’t know about. I was hoping you could provide some guidance. I am including all relevant code I used. Of course, if it’s too much trouble to slog through all my code to find bugs, any hint you could give me would be greatly appreciated--even so basic as how to start figuring out what’s wrong myself (chip manuals and the like?). (By the way, the hardware I used was a Mac Plus with both a Southworth Jambox 4 and an Assimitation MIDI Conductor. When I tried TxMIDIA, I got no light on the Jambox panel, no response from my synthesizer, and no message on my Yamaha MEP4 MIDI monitor--meaning either no recognizable message was sent or no message at all.)

Offending code:

 
outmidi := $0092;
txmidia(outmidi);
outmidi := $003C;
txmidia(outmidi);
outmidi := $0040;
txmidia(outmidi);

while button do
 ;
while not button do
 ;
while button do
 ;

outmidi := $0082;
txmidia(outmidi);
outmidi := $003C;
txmidia(outmidi);
outmidi := $0040;
txmidia(outmidi);

[Not being a MIDI expert myself, I’ll leave this up to any MIDI experts out there. But Kirk Austin did an update to his MIDI routines for an article in May 1989. After a quick look, I did notice a couple differences between the code you sent in and Kirk’s latest version. Kirk’s latest MIDI code wasn’t published due to space limitations. The code is on the source code disk (#44) if you wish to order it. --Ed.]

Powerful Math Libraries Available With Language Systems FORTRAN

Drew Steis

Herndon, VA

Language Systems Corporation announced that powerful math libraries from the Numerical Algorithms Group, Inc. (NAG) are now available for use with Language Systems FORTRAN. The mathematical library of scientific and engineering subroutines has not been available on the Macintosh until now.

“NAG is a well-known international producer of scientific and engineering subroutines for supercomputers, mainframes and high-end workstations,” said Rich Norling, chairman of Language Systems Corporation. “Now, for the first time, Macintosh II users will be able to access the same algorithms used on supercomputers. NAG has made 172 of the most frequently used subroutines available in one package for the Macintosh II. This is a substantial portion of the NAG FORTRAN Library and provides broad coverage of the principal areas of mathematics and statistics.

Karl Knapp, Technical Manager of NAG, called the availability of the NAG Workstation Library for Language Systems FORTRAN on the Macintosh II “a significant development, particularly for engineers who find themselves coding mathematical formulas over and over again from scratch. The library should free them up to get on with their real work.

The NAG Workstation Library offers subroutines for a wide range of mathematical applications including matrix operations, optimization, linear algebra, time series analysis and many others. The software is of particular value in projects for aerospace, energy production, chemical manufacturing, electronic design, and other areas where advanced mathematics are required.

Language Systems FORTRAN was the first FORTRAN compiler to be based in the Macintosh Programmers Workshop (MPW). The compiler is full ANSI Standard FORTRAN 77 and has the most VAX-compatible extensions on the Macintosh. It has the full capabilities of the Standard Apple Numeric Environment (SANE™), Apple Computer’s implementation of IEEE Standard 754 for Binary Floating-Point Arithmetic.

Language Systems FORTRAN Version 1.2.1 can be acquired from APDA. The NAG Workstation Library can be obtained from Numerical Algorithms Group, Inc. 1400 Opus Place Suite 200, Downers Grove, IL 60515 (312) 971-2337.

 
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.