TweetFollow Us on Twitter

Oct 99 Factory Floor

Volume Number: 15 (1999)
Issue Number: 10
Column Tag: From the Factory Floor

A Palm Update, Part 2

by Eric Cloninger and Dave Mark

Web apps with Lasso and FileMaker Pro

Last month's Factory Floor got us back in sync with the Palm development universe. We checked out some of the new features in the upcoming Palm OS SDK and CodeWarrior for Palm OS releases. This month, Eric Cloninger will take us through the process of developing an internationalized Palm OS application.

Eric Cloninger is the product manager and technical lead for CodeWarrior for Palm OS. When he isn't working on CodeWarrior, he spends way too much time on his research project - how to rid the world of the affliction known as the 'designated hitter rule'. He can be reached at ericc@metrowerks.com.

Dave: Tell me about the application you'll be taking us through.

Eric: This month, I'm going to go through an application I wrote using CodeWarrior for Palm OS Release 6 (available in October 1999). The application, called Base X, takes advantage of several new features that Palm has added to the OS, the SDK and the tools.

Since our goal is to make an international Palm OS application, I chose an example that is simple to describe but is also useful in a real-world sense. This example, called Base X, provides four edit fields that display the same 4 byte value as decimal, hexadecimal, octal, and binary. In addition to the user interface elements on the main form, Base X has a menu bar, an alert and an info string, all of which have been localized from English to German, French, and Japanese.

I started by creating a new project from the "Palm OS C App" stationery project. CodeWarrior for Palm OS provides stationery projects for Palm OS 3.1 (for the original Pilot, PalmPilot, Palm III, and Palm V), Palm OS 3.2 (for the wireless Palm VII), as well as Japanese examples.

I renamed the resource file to BaseX_english.rsrc and opened it with Constructor for Palm OS. Constructor for Palm OS is very similar to Constructor for PowerPlant - you can create menus, menu bars, pictures, icons, etc. In fact, all of these elements use standard MacOS resource types, so you can edit them with ResEdit or Resourcerer. The thing that is unique about Constructor for Palm OS is that it lets you create the Palm-specific resource types that define how forms look. Figure 1 is from Constructor for Palm OS - it shows the main form for Base X as it appears in the English resource file.


Figure 1. Constructor for Palm OS editing a Palm OS form.

After I created the user interface, I moved the resources that are language neutral into a separate resource file called BaseX_Common.rsrc. Then, I moved the English resource file into a directory named "English" and duplicated it for German, French, and Japanese and renamed the files appropriately.

In my CodeWarrior project, I created four targets, one each for English, German, French, and Japanese. Next, I added the common resources to all four targets and the language-specific resources to each of the language targets. At this point, for each target I have a source file, a common resource file, and a language-specific resource file. I have not yet written any code to operate my user interface, but the starter application has enough code in it to display my form.

Next came the localization part. First, I browsed to babelfish.altavista.com and tried their web interface. The engine that provides the translation on the web page is available as a commercial product called SYSTRAN. I used the web interface to convert my strings, but I found that the translations weren't quite right and it doesn't translate to Japanese. Since Metrowerks has offices in many parts of the world, I asked employees to do the translations instead. These employees aren't in our Austin office and they didn't have immediate access to the Palm tools, so I had to find a way to get the strings to them easily.

Using the CodeWarrior IDE, I created an empty target in my project called "DeRez". Then I added the English resource file to that target and changed the settings for the target to use the 68K linker (to activate preference panels - no linking occurred in this target). Next, I changed the "File Mappings" panel so that files of type "PLob" (Palm OS Constructor files) are compiled with the "Rez" compiler. Finally, I entered a file called PalmTypes.r for the Prefix file in the "Rez" panel. I saved these settings and returned to the "Files" view of the project window.

From the files view, I clicked on BaseX_english.rsrc and held the mouse button for a second until the pop-up menu appeared with an item called "Disassemble". The Rez compiler will disassemble resource files into .r files if it has type definitions for the resources, which is what PalmTypes.r provides. The result of the disassembly is a new text file that I sent to my colleagues. PalmTypes.r is available from Palms' developer web site, by the way.

I knew it would be several thousand Swatch beats before I got my replies back, so I decided to jump into the programming task.

Base X has four edit fields into which the user can enter text for decimal, hexadecimal, octal and binary numbers. When the user enters a character, Base X sees if the character is valid for the field with the edit focus and converts all the fields if it is. The code for all of BaseX is too long to include in this article, so I've put it on Metrowerks web site at the address shown at the end of this article. The code segment below is the part that converts strings from one base to another and is where I had to use the Palm OS internationalization manager.

// This struct describes how to convert strings 
// into different bases. It’s OK for this to be 
// single-byte chars because it’s never shown.
struct {      
 char *digits;
 char multiplier;
} cvtTable[4] = {
 {“0123456789”, 10},
 {“0123456789abcdef”, 16},
 {“01234567”, 8},
 {“01”, 2}
};

// Convert a string to a number using base ‘x’
ULong ToLong(WChar *str, short table_index) {
 unsigned long accum = 0;
 WChar ch = 0;
 short str_index = 0;
 short accum_index = 0;
 
 // Go through the input string, pull each 
 // character off and find the index of that
 // character in the table. That index is 
 // the amount to add to the accumulator.
 while (str_index < EDIT_SIZE) {
  str_index += TxtGlueGetNextChar(
     (Char *) str, str_index, &ch);
  if (ch)
  {
   accum_index = 0;
   while ((accum_index <
     StrLen(cvtTable[table_index].digits)) &&
     (WChar)
     cvtTable[table_index].digits[accum_index]
     != ch)
    accum_index++;

   accum *= cvtTable[table_index].multiplier;
   accum += accum_index;
  }
 }
 
 return accum;
}

// Creates a string of base ‘x’ from a long value
void ToString(ULong value, WChar *str, short table_index)
{
 short masked_value;
 char temp_str[EDIT_SIZE];
 char *p = temp_str;
 short str_index = 0;
 
 while (value > 0) {
  masked_value = value % 
      cvtTable[table_index].multiplier;
  *p++ = cvtTable[table_index].digits[masked_value];
  value /= cvtTable[table_index].multiplier;
 }

 // At this point, temp_str is in reverse order.
 // Create output by walking temp_str in reverse.
 str_index = 0;
 while ( — p >= temp_str) 
  str_index += TxtGlueSetNextChar(
    (Char *) str, str_index, (WChar) *p);
}

The functions prefixed by 'TxtGlue' are notable because they are implemented through a library called PalmOSGlue.lib instead of the A-trap mechanism used by most of the OS calls. These functions are safe to use on devices running version 2.0 or later of the Palm OS, regardless of whether it is a single-byte or multi-byte OS.

By the time I had the code working for English, my translations were done. Thanks to Andreas Hommel, Christophe Escobar, and Shoji Ueda for providing this service. Next came the task of getting the converted resources into the project without re-entering the text myself.

Developers who work with localized applications are faced with the same situation I found myself in - whether to keep localized resources in a text file where the text can be modified easily, or to keep them as resource files where their properties can be modified with a visual editor. Either method is fine and CodeWarrior allows me to use resource files or Rez files, so I chose to set up my project so that I could use either method.

I created a new target called 'Rez French' cloned from the 'French' target. I modified the settings so that the output file created by the MacOS linker is different from the output file generated by the resource file target. I also modified the 'Rez' panel to include the 'PalmTypes.r' file as the prefix file. Into this target, I added the translated BaseX_french.r file. Then, I built the project.

The output from the linker and post linker was the translated Palm OS application. An artifact of the build process is a file that also contains all my application's resources before they were modified by the post linker. I opened this intermediate file, called BaseXRsrc.tmp, with ResEdit and copied all the resources except 'CODE' and 'DATA' into my French resource file named BaseX_french.rsrc. At this point, I can create a French Palm OS application using either the .r file that is compiled by the Rez compiler or I can build the same application using resources included from the Constructor file. Next, I duplicated this work for the English, German, and Japanese targets.

After building my applications, I want to run them and see how they work. I could download them individually to my Palm OS device over the serial connection or I can use an extremely useful application called the Palm OS Emulator, or POSE for short. POSE is an application that contains a 68K emulator and it runs the Palm OS image that is in ROM. You must own a Palm device to get the ROM image, which is downloaded from your Palm device using an application called ROM Transfer.

Figure 2 shows the Palm OS Emulator running the Japanese version of BaseX. Any Palm device is capable of displaying English, French, and German applications. Japanese applications require a Japanese-enabled ROM to display the text correctly.


Figure 2. Palm OS Emulator and CodeWarrior debugger.

Let's suppose that I decide I don't like the way one of the Japanese screens looks - perhaps I want to change the text of the info string shown in the about box. Instead of sending the text file to Tokyo where it's early in the morning, I use Constructor for Palm OS to modify the strings myself. Palm has modified Constructor to work with the Japanese Language Kit. With the JLK installed on my Mac, I need only change the selection for the "Palm OS Target" in Constructor to "Palm OS for Japan" and then I can begin editing in Japanese.

Now, I open the editor for the string that I want to modify. I select Japanese mode input by clicking on the blue triangle on the menu bar in the upper right corner. As I type, the MacOS pops up a text entry window that converts the 'sounds' I am typing into the correct characters, as shown in Figure 3.



Figure 3. Constructors' string editor with Japanese text input.

At this point, BaseX is completed. I hope that I've been able to show that CodeWarrior for Palm OS and the Palm OS SDK provide a rich toolkit for developers who want to or need to write international applications. CodeWarrior Professional users who want to try out the Palm OS tools can do so after October by visiting the Metrowerks web site and downloading the tools.

Users who want to play with the BaseX project file or the application can download the archive from the Metrowerks Palm OS web site listed at the end of the article.

Resources

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Capo 3.2 - Slow down and learn to play y...
Capo lets you slow down your favorite songs so you can hear the notes and learn how they are played. With Capo, you can quickly tab out your songs atop a highly-detailed OpenCL-powered spectrogram... Read more
OmniOutliner 4.2.3 - Organize your ideas...
OmniOutliner is a flexible program for creating, collecting, and organizing information. Give your creativity a kick start by using an application that's actually designed to help you think. It's... Read more
pwSafe 4.0.1 - Secure password managemen...
pwSafe provides simple and secure password management across devices and computers. pwSafe uses iCloud to keep your password databases backed-up and synced between Macs and iOS devices. It is... Read more
WALTR 1.5.4 - Drag-and-drop any media fi...
WALTR is designed to make it easy to upload and convert any music or video file to an iPad or iPhone format for native playback. It supports a huge variety of media file types, including MP3, MP4,... Read more
Audio Hijack 3.1 - Record and enhance au...
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio... Read more
PopChar 7.1 - Floating window shows avai...
We're also selling a 5-license family pack for only $25.99! PopChar helps you get the most out of your font collection. With its crystal-clear interface, PopChar X provides a frustration-free way to... Read more
BBEdit 11.1.1 - Powerful text and HTML e...
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
Picasa 3.9.139 - Organize, edit, and sha...
Picasa and Picasa Web Albums allows you to organize, edit, and upload your photos to the Web from your computer in quick, simple steps. Arrange your photos into folders and albums and erase their... Read more
Mac DVDRipper Pro 5.0.5 - 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
NetShade 6.2 - Browse privately using an...
This promotion is for NetShade and 1 year of Proxy and VPN services NetShade is an anonymous proxy and VPN app+service for Mac. Unblock your Internet through NetShade's high-speed proxy and VPN... Read more

Block Fortress has a Big New Update for...
Block Fortress is a survival-style game that's as fun as it is blocky. It's also just gotten a rather sizeable update that adds a lot more cool stuff. [Read more] | Read more »
Simple and Surreal Star Base Sim rymdkap...
I really like rymdkapsel. Not just because I'm a sucker for games that are cleverly simple or highly stylisitc, but because it's fun and challenging. Actually it's extremely challenging, which is why I was excited to learn that it's getting a couple... | Read more »
Check out the anticipated Angel Stone in...
Fincon has finally revealed Angel Stone in action in the first ever official gameplay trailer for the anticipated hack and slasher. Angel Stone is set in a post-apocalyptic world in which humanity is in danger of being wiped out by the demonic... | Read more »
Moleskine Timepage is an All-New Calenda...
Moleskine Timepage is a bit of a departure for the notebook manufacturer (since it has little to do with notebooks), but it certainly carries their simple and elegant style quite well. [Read more] | Read more »
Jog on Over and Check Out the New Runtas...
Runtastic has put out a fair number of apps to help you sleep, track excercise, and train various parts of your body. Now it's time for your legs to have their own time in the spotlight with Runtastic Leg Trainer. [Read more] | Read more »
It's Lights Out in the Upcoming Pla...
Ember’s Journey is a stark puzzle platformer with a twist: the entire game is played in darkness. The only light you can see by is the one emanating from your own character. [Read more] | Read more »
MooVee - Your Movies Guru (Entertainmen...
MooVee - Your Movies Guru 1.0 Device: iOS iPhone Category: Entertainment Price: $1.99, Version: 1.0 (iTunes) Description: MooVee helps you effortlessly manage your movies, on your iPhone. | Read more »
Geometry Wars 3: Dimensions (Games)
Geometry Wars 3: Dimensions 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: Enjoy the next chapter in the award-winning Geometry Wars franchise and enjoy stunning, console-quality... | Read more »
CHAOS RINGS Ⅲ (Games)
CHAOS RINGS Ⅲ 1.0.0 Device: iOS Universal Category: Games Price: $19.99, Version: 1.0.0 (iTunes) Description: The newest addition to the popular smartphone RPG series is finally here! ・CHAOS RINGS Overview | Read more »
The Popular Insight Series of Travel Gui...
Getting around in a country when you can't understand the primary language can be tough. Fortunately there are several options available to help wold travellers with the important stuff like giving directions to a cab driver or asking where the... | Read more »

Price Scanner via MacPrices.net

Apple restocks refurbished Mac minis for up t...
The Apple Store has restocked Apple 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... Read more
13-inch 2.4GHz Retina MacBook Pro (refurbishe...
The Apple Store has 2013 Apple Certified Refurbished 13″ 2.4GHz/128GB Retina MacBook Pros available for $879–$320 off original MSRP. Apple’s one-year warranty is standard, and shipping is free: - 13... Read more
Apple refurbished iPad Air 2s now available f...
The Apple Store is now offering Apple Certified Refurbished iPad Air 2s for up to $140 off the price of new models. Apple’s one-year warranty is included with each model, and shipping is free: -... Read more
MacBook Airs on sale for up to $80 off MSRP
Save up to $80 on the purchase of a new 2015 13″ or 11″ 1.6GHz MacBook Air at the following resellers. Shipping is free with each model: 11" 128GB MSRP $899 11" 256GB... Read more
Free Glide Live Video Messaging App Brings Ne...
Glide, an Israeli startup whose popular live video messenger has attracted more than 15 million users, has released significant updates to its free iOS app. Glide for iOS now gives users more control... Read more
Top Markets Saturation To Slow Global Smartph...
According to a new mobile phone forecast from the International Data Corporation (IDC) Worldwide Quarterly Mobile Phone Tracker, smartphone shipments are expected to grow 11.3% in 2015 — down from 27... Read more
Apple’s Education discount saves up to $300 o...
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
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple 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.... Read more
Apple refurbished 2014 13-inch Retina MacBook...
The Apple Store has Apple Certified Refurbished 2014 13″ Retina MacBook Pros available for up to $400 off original MSRP, starting at $979. An Apple one-year warranty is included with each model, and... Read more
What Would the ideal Apple Productivity Platf...
For the past four years I’ve kept a foot in both the Mac and iPad camps respectively. my daily computing hours divided about 50/50 between the two devices with remarkable consistency. However, there’... Read more

Jobs Board

*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
Program Manager, *Apple* Community Support...
**Job Summary** Apple Support Communities ( discussions. apple .com) helps customers get the most from their Apple products and services by providing access to Read more
Senior Data Scientist, *Apple* Retail - Onl...
**Job Summary** Apple Retail - Online sells Apple products to customers around the world. In addition to selling Apple products with unique services such as iPad Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
*Apple* Watch SW Application Project Manager...
**Job Summary** The Apple Watch software team is looking for an Application Engineering Project Manager to work on new projects for Apple . The successful candidate Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.