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

How to become the ultimate robot warrior...
Chrono Strike is a delightfully immersive beat ‘em up with a sense of humor (any game with a good Sims reference gets points in my book). [Read more] | Read more »
Tips and tricks to get a higher score in...
Snow Roll is a devilish endless runner very much in the vein of Flappy Bird. It revels in its dastardly level of difficulty, and doesn’t really care how angry you get at it as it knows you’ll keep coming back for more. [Read more] | Read more »
How to win big in Slots Deluxe
Cheating while gambling is illegal and morally wrong, and in some parts of the world it leads to men with names like Vinnie "Six Knuckles" Manchenzo beating you to a pulp in a dark alley. [Read more] | Read more »
How to take over the world in Dictator 2
Running a country isn't easy - especially when you're a dictator who wants to take over the world and crush everyone in your path while you do it. [Read more] | Read more »
Tips and tricks to get a higher score in...
Tank.iois - you guessed it! - another multiplayer arena battler likeAgar.io and Slither.io. It does differentiate itself by putting you in a tiny tank though, so it's not exactly the same. To help you get that all-important high score, we've got a... | Read more »
How to unlock characters in One Tap Tenn...
As the title suggests, One Tap Tennis requires only a single tap to play its particular brand of tennis, and rewards you with a ton of unlockable characters if you perform well. Fortunately for you, we at 148Apps have got a few tips and tricks to... | Read more »
Grab it now: Game Craft’s Legend of War...
The real time strategy game is now available for you to sink your teeth into, through the App Store and Google Play. Combining elements of skill, strategy and empire building, Legend of War is a real gamers’ game. [Read more] | Read more »
Skateboard Party 3 ft. Greg Lutzka (Gam...
Skateboard Party 3 ft. Greg Lutzka 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Skateboard Party is back! This third edition of the popular sports franchise features professional skater... | Read more »
Cubious (Games)
Cubious 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Cubious – How smart are you? How high is your IQube? Solve the impossible puzzles to find out, and help a lost little cube find his... | Read more »
Goat Simulator Waste of Space (Games)
Goat Simulator Waste of Space 1.1 Device: iOS Universal Category: Games Price: $4.99, Version: 1.1 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICESiPhone 4S, iPad 2, iPod Touch 5 or better.** | Read more »

Price Scanner via MacPrices.net

Enterprise Workers Pick Technology Over Perks...
New Adobe study shows surprising attitudes about office jobs and where the future of work is heading. Adobe has released survey findings revealing that a surprising 70 percent of U.S. office workers... Read more
Memorial Day Weekend Sale: $50-$100 off 11-in...
B&H Photo has 13″ and 11″ MacBook Airs with 256GB SSDs on sale for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 11″ 1.6GHz/256GB MacBook Air: $999 $100 off MSRP... Read more
Memorial Day Weekend Sales: Apple MacBook Pro...
B&H Photo has 13″ and 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz... Read more
Memorial Day Weekend Sales: Apple iMacs and M...
Take up to $150 off the price of a new iMac or Mac mini at the following Apple resellers this Memorial Day weekend: iMacs: B&H Photo has 21″ and 27″ iMacs on sale for up to $150 off MSRP... Read more
Apple refurbished Retina MacBook Pros availab...
Apple has Certified Refurbished 2015 13″ and 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... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Goal Zero and OtterBox Partner to Expand iPh...
Goal Zero, specialists in portable power, have announced a partnership with OtterBox, brand smartphone case protection, to offer the Slide and Slide Plus Batteries as modules compatible with the new... Read more
15-inch Retina MacBook Pros on sale for up to...
B&H Photo has 15″ Retina MacBook Pros on sale for up to $210 off MSRP. Shipping is free, and B&H charges NY tax only: - 15″ 2.2GHz Retina MacBook Pro: $1799 $200 off MSRP - 15″ 2.5GHz Retina... Read more
Clearance 2015 13-inch MacBook Airs available...
B&H Photo has clearance 2015 13″ MacBook Airs available for $250 off original MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/4GB/128GB MacBook Air (MJVE2LL/A): $799... Read more
Apple refurbished Apple TVs available for up...
Apple has Certified Refurbished 32GB and 64GB Apple TVs available for up to $30 off the cost of new models. Apple’s standard one-year warranty is included with each model, and shipping is free: -... Read more

Jobs Board

*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Project Engineer - Smart Source Inc...
SmartSource is in need of an Apple Project Engineer for a 12 month contract opportunity in Pittsburg, PA. Role: Apple Project Engineer Location: Pittsburg, PA Read more
Automotive Sales Consultant - Apple Ford Linc...
…you. The best candidates are smart, technologically savvy and are customer focused. Apple Ford Lincoln Apple Valley is different, because: $30,000 annual salary Read more
Service Assistant - *Apple* Chevrolet *App...
Apple Automotive is one of the fastest growing dealer...and it shows. Consider making the switch to the Apple Automotive Group today! At Apple Automotive, we Read more
Editor, *Apple* News - APPLE (United States...
Job Summary The Apple News team is looking for a passionate and knowledgeable editor with experience covering entertainment/pop culture and experience running social Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.