Welcome!

You will be redirected in 30 seconds or close now.

ColdFusion Authors: Yakov Fain, Maureen O'Gara, Nancy Y. Nee, Tad Anderson, Daniel Kaar

Related Topics: ColdFusion

ColdFusion: Article

ColdFusion in the Palms of your Hands

ColdFusion in the Palms of your Hands

I am completely hooked on my new wireless Palm! The Palm Pilot VII has changed the way I access information — I can find it anywhere and any time I need it. With the newest Palm I can check account balances in real time on DLJDirect, buy a book from Amazon.com and — using the popular Starbucks Finder application — find the nearest Starbucks. With so many useful wireless applications available, you might be wondering why you can't create your own with ColdFusion. Well, you can! And after reading this article, you'll be well on the way to writing your own wireless applications for the Palm Pilot VII.

Wireless Applications Background

I'm not the only one who's in love with the idea of wireless access to the Web. In a recent study it was reported that the market for wireless handheld devices could reach 500 million by 2003, which will create a huge demand for Web applications that are "unplugged" and optimized for wireless devices.

For developing wireless applications, two similar but competing protocols for wireless Web access have emerged. The first is the Palm Wireless Web Clipping Protocol — a proprietary but popular solution developed by 3COM. The second is the Wireless Application Protocol. WAP is a more open protocol developed by companies like Unwired Planet, Motorola, Nokia and Ericsson to provide wireless Web access to cellular phones. For this article I'll focus on writing wireless Web applications in ColdFusion for the Palm Pilot Web clipping protocol, and in a future article I'll discuss how to write ColdFusion applications for WAP. Even though these two protocols are different in their implementations, developing applications for each is quite similar.

The palm.net Service

The Palm Pilot VII is a wireless device that contains its own built-in antennae for wireless access to the Web. Once you bring your Palm home, it's easy to sign on and start surfing wirelessly on the Web — simply flip up your Palm's antennae and access the Activate Application to sign on. All it takes is a credit card and about 15 minutes to get started.

3COM charges an online access fee to access the palm.net service. This is a monthly service fee similar to what you'd pay an ISP for Internet access. The palm.net service is a bit pricey compared to your basic ISP costs, and also comes with limits on the number of bytes that can be accessed on a monthly basis. 3COM has basic, extended and volume plans that range from $10 per month to $40 per month, with each providing a greater number of KB per month. I purchased the volume plan and, in the first several weeks with fairly active use, I haven't used up even half of my quota.

3COM provides a Web site, www.palm.net, with a lot of great information about the service and a wide array of Web clipping applications that you can download. Available applications include Financial, News, Reference, Travel, Entertainment, Communication, Shopping and Enterprise applications. It also includes a Web browsing function that allows you to access any URL, many stock quote and online trading systems, an application to check airline flight times, and various shopping apps, including Amazon.

Web Clipping Architecture

At the heart of the palm.net service is 3COM's Web clipping proxy server. This server is responsible for converting the standard Internet protocols and content from normal HTML Web pages into a form that's optimized for low-bandwidth wireless transmission and for display on a small device. Figure 1 shows how the proxy server takes the HTTP, SSL and TCP standard protocols and compresses them for wireless access via the Palm Pilot VII.

ColdFusion applications work in this environment just like any other Web page. URL requests are made from the Palm. They go through the wireless network and the proxy to the ultimate destination of the Web server. It doesn't matter that the requested page is an HTML, a CFM or an ASP. As long as the actual content returned from the server is in HTML format that can be processed, compressed and sent through the wireless network, it should work just fine.

Does this mean you can just take your existing ColdFusion apps and make them accessible to the wireless network and they'll work? Well, not quite. As I'll explain in the following section, there are many considerations you have to keep in mind when developing unplugged (wireless) ColdFusion Applications.

The following steps demonstrate the flow of a Web clipping application when launched:

    1. If the linked page or graphic is installed on the Palm VII organizer, the page or graphic is displayed without downloading anything remotely.
    2. In other cases the Palm VII organizer compresses the query into a small file in Palm query format and sends this packet over the air to a local base station.
    3. The local base station relays the compressed packet to the Web clipping proxy servers on the palm.net service.
    4. The Web clipping proxy server translates the query packet into a standard HTTP packet and then sends the decompressed query to the appropriate Internet address. All communication between the Web clipping proxy server and the Internet server is via the standard Internet protocols of TCP, HTTP and SSL.
    5. The HTTP server returns an HTML clipping to the Web clipping proxy server.
    6. The Web clipping proxy server compresses the HTML clipping into a Palm proxy format file and sends it back to the local base station.
    7. The local base station relays the clipping to the Palm VII organizer, where the Web clipping application renders the page for viewing. Communication between the Palm VII organizer and the Web clipping proxy server is via the User Datagram Protocol (UDP).
The Basics of a Palm Web Clipping App

The basic mechanics of authoring Web clipping applications are similar to the mechanics of authoring Web pages in general. However, because of the constraints of authoring for a handheld organizer connected to the Internet via a relatively expensive radio link, you'll need to rethink your philosophy of design and implementation. The world looks much different when you're holding a small, low-power computer like the Palm VII organizer with its tiny screen, battery-powered operation and relatively slow and expensive wireless connection to the Internet.

Palm applications are called PQAs (Palm query applications). A Web clipping application is a PQA that is developed to take advantage of the wireless capability of the Palm VII.

The basic steps involved in writing a PQA application include the following:

  • Produce HTML pages and graphics to serve as the base for the PQA.
  • Convert the HTML pages and graphics using a tool called the Query Application Builder to produce the PQA file (to be reviewed later).
  • Test the PQA, using either the Palm VII organizer itself or a Palm Emulator, which allows you to run the PQA apps on your workstation.
  • Distribute the compiled file. Users install it with HotSync software on their Palm VII organizers.

    When developing Web clipping applications, follow the same rules as above. What makes a PQA a Web clipping application is that it has links to pages that are not stored on the Palm but are accessed remotely over the Web. These remote links are coded just like any other Web application link.

    Writing a Simple Web Clipping App

    The following example shows how you can create the most basic Web clipping application for the Palm Pilot. It's very simple. You can start out with the code in a single HTML file that does nothing more than display "Hello World." The entire HTML source code that's used to build the application is in Listing 1.

    The first step in turning the HTML file into a Web clipping app is to create a PQA file through 3COM's Query Application Builder, which can be found at www.palm.com/devzone. (Note that the domain for this is palm.com, not palm.net.)

    The Query Application Builder is a simple application that converts your HTML and image files into a single PQA file. Just select the File and Open Index menu to select your HTML file.

    Once an HTML file is selected, it's displayed in the Query Application Builder file window. If the HTML file referenced any local images, they'd be displayed here, as well as included in the PQA file (see Figure 2).

    Once the HTML file has been selected, choose "Build PQA" from the File menu. Then the Build PQA Dialog Box specifies the name of the PQA that is being created (see Figure 3).

    Note: The icons for this application default to the diamonds with the remote signal displayed on the right in Figure 3. For this application the defaults are being used. In the next example, using ColdFusion, an Allaire image is used for the application icon.

    Now that you've created the "Hello World" Web clipping application, you can install it to your Palm VII handheld using the Palm desktop software. This is the same process you'd go through to install any PQA application onto your Palm. Just add applications to the desktop software running on your workstation and then load the application to your Palm by synchronizing Palm's HotSync utility.

    Once you add and synchronize the new PQA, you'll see the new application appear on your Palm. Now we have a new application icon on our Palm called "Hello World" (see Figure 4).

    Clicking on the new "Hello World" application icon will launch our simple application. Figure 5 shows our simple application running on the Palm. Remember that so far we've only accessed local data. Next we'll get into accessing data over the Web.

    Writing a ColdFusion Web Clipping App

    In order to write a ColdFusion application for the Palm, we have to involve more than just local pages. As in the previous example, we must add Web clipping pages remotely over the Web.

    The two main components in a Web clipping application are as follows:

    • Web clipping application (also known as the PQA): This is an application you build using HTML, which is installed by the end user onto a handheld organizer. A Web clipping application is like a mini-Web site that's stored locally, so access to it is instant and free. The index page of the Web clipping application usually contains either a form or a list of links, which are the gateways to the live data provided by your server.

      The part of the application that gets compiled into the PQA must be generic and should include only what's not likely to change. If anything changes in the code that's compiled into the PQA, the application has to be redistributed and reloaded onto the Palm Pilots of all your users.

    • Results pages (clippings): Pages are returned by your back-end server after receiving a request from your Web clipping application. It's the key part of the overall application, and where all the real work gets done. These pages can be written in HTML, ColdFusion, ASP or whatever. The pages can pull in remote database information and behave similarly to browser-based ColdFusion pages. Images can either be referenced remotely or locally if they were pulled into the PQA. Referring to local images is very useful in saving precious bandwidth, but it leaves less room later to change those images without redistributing the PQA.

    The Web clipping pages developed as part of the application can also be accessed through a browser in addition to being accessible through the Palm. Does this mean you can develop an application and deploy it to both the browser and Palm? Not really. Since the Palm only supports a subset of things that can be done on a browser, the UI needs to be specific to the Palm.

    One strategy in deploying applications to both the Palm and browser is to separate the user interface from the business and database logic as much as possible so that business logic pages can be included in both the Palm and browser versions of the application. In many ways you can just treat the Palm as a very, very limited browser. The limited nature of this handheld device is equally true with the WAP applications. Web Clipping HTML Specifics

    Web clipping applications are written in a subset of the HTML 3.2 specification. Many of the usual tags for things like tables, forms, checkboxes, radio buttons, select lists and font sizes are supported. However, Web clipping applications don't support more resource-intensive features such as JavaScript, nested tables, frames, cookies or Java.

    Web clipping applications are designed to be small and to give users the information they need with minimum effort and maximum speed. Likewise, results coming from your server to a handheld device are designed to be small and to the point. Remember, this is not Web browsing, but Web clipping. Web clipping applications should be written to provide users only with the information they need, without any extraneous items. Try limiting the size of your result pages to about 400 bytes.

    There are two meta tags you'll want to consider incorporating into your Web clipping applications:

  • PalmComputingPlatform: Identifies your page as a "Palm Friendly" page — i.e., one that's been designed to work well on a small screen and isn't wasteful of bandwidth. When you include this tag, images will be rendered and the entire text will be displayed on the device. Otherwise, images will be stripped out and only the first 1,024 bytes of your page will display. This meta tag should be used on all of your local and remote clipping pages.

    <meta name="PalmComputingPlatform" content="true">

  • LocalIcon: Stores graphics and HTML documents not otherwise referenced locally within your Web clipping application. It is to be used only in local pages and should be placed only in the root page of the Web clipping application.

    <meta name="LocalIcon" content="images/palm_image.gif">

    Two other meta tags are also useful.

  • HistoryListText: Specifies the user-visible string for each clipping displayed in the history pop-up menu on the Palm. This meta tag can be used on all of your Web clipping pages.

    <meta name="HistoryListText" content="true">

  • PalmLauncherRevision: Sets the version string for your Web clipping application. To be used on the main index (or root) page of your Web clipping application. This string can be viewed in the Info window of the Applications Launcher. The version in my example below is 1.0, but it can be whatever is meaningful for your application.

    <meta name="PalmLauncherRevision" content="1.0">

    Web clipping applications also support secure HTTPS connections to make credit card purchases and stock transactions possible. The Palm indicates a link is an over-the-air secure link by automatically displaying the top icon at right on all anchor tags, except where a user-defined image is used. All other over-the-air links have the bottom icon at right next to the link. To ensure consistency with other Palm applications, user-defined images should include either the secure icon or the nonsecure icon.

    In Web clipping applications there are three types of links that you'll be using. The first is a link from one local page to another on the Palm — a remote link to a remote link. The syntax for this link is the following:

    <a href="about.html">

    The second type of link is from a local page to a remote page. The syntax for this link is the following:

    <a href=http://www.allaire.com/about.html>

    The third type of link is from a remote page to a local page stored on the Palm. The syntax for this link is the following:

    <a href="file:coldfusion.pqa/about.html">

    Since the Palm screen is much smaller than a browser page, graphics should be used with care. GIF and JPEG images are both supported by the Web clipping system. However, the usable screen size is only 153 pixels wide by 144 pixels high and only gray-scale images are supported.

    The idea in developing Web clipping applications is to keep the images small and to reference them locally wherever possible.

    The LocalIcon meta tag is used to store graphics locally, using the following syntax:

    <meta name="LocalIcon" content="images/palm_image.gif">

    It can be referred to remotely in a clipping page using the following syntax:

    <td><IMG height=30 src="coldfusion.pqa/palm_image.gif" width=30></td>

    Sample ColdFusion Application

    The following application shows how a ColdFusion application interacts with a PQA. The application is a simple ColdFusion application that contains a form that accepts a keyword and then passes it to a result page that queries a database of contacts and returns the results.

    Figure 6 shows the ColdFusion sample application that was created using the Query Application Builder and loaded onto the Palm. It is called ColdFusion.

    Listing 2 shows the code associated with the HTML file used to build the PQA. This form loads a local image to be displayed on the page and contains a link to my ColdFusion page (the Web clipping).
    This sample page makes use of a table that contains some text and a local image reference. In addition, it contains the link that references the remote clipping page developed in ColdFusion. The page on the Palm looks like Figure 7.

    Listing 3 shows the source code of the simple ColdFusion page that is loaded via the Web onto the Palm.

    This page makes use of an input form with a submit button that sends the form variable to the ColdFusion result page to query and display the results. The resulting page is shown in Figure 8.

    Listing 4 shows the ColdFusion code that accepts the form variable from the input page and performs the query to return the results back.

    This page makes use of a ColdFusion query tag that selects the list of matching contacts and an output tag that displays the results to the Palm screen. You can see what the page looks like on the Palm in Figure 9.

    Summary

    Developing wireless Web applications gives you the ability to roll out applications to handheld devices. This process allows access to those applications for users at any time and in any place. The Palm platform provides a very nice vehicle for deploying wireless applications in ColdFusion. Acknowledgements

    Portions of this article were taken from texts and articles on developing Web clipping applications from the Palm development zone

  • More Stories By Paul Elisii

    Paul J. Elisii is the founder and CTO of eTech Solutions, Inc., a Philadelphia-based e-business development company and a BEA partner. He is active in developing and researching emerging technologies for eTech Solutions.

    Comments (0)

    Share your thoughts on this story.

    Add your comment
    You must be signed in to add a comment. Sign-in | Register

    In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


    @ThingsExpo Stories
    SYS-CON Events announced today that iDevices®, the preeminent brand in the connected home industry, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. iDevices, the preeminent brand in the connected home industry, has a growing line of HomeKit-enabled products available at the largest retailers worldwide. Through the “Designed with iDevices” co-development program and its custom-built IoT Cloud Infrastruc...
    There will be new vendors providing applications, middleware, and connected devices to support the thriving IoT ecosystem. This essentially means that electronic device manufacturers will also be in the software business. Many will be new to building embedded software or robust software. This creates an increased importance on software quality, particularly within the Industrial Internet of Things where business-critical applications are becoming dependent on products controlled by software. Qua...
    As enterprises work to take advantage of Big Data technologies, they frequently become distracted by product-level decisions. In most new Big Data builds this approach is completely counter-productive: it presupposes tools that may not be a fit for development teams, forces IT to take on the burden of evaluating and maintaining unfamiliar technology, and represents a major up-front expense. In his session at @BigDataExpo at @ThingsExpo, Andrew Warfield, CTO and Co-Founder of Coho Data, will dis...
    The Quantified Economy represents the total global addressable market (TAM) for IoT that, according to a recent IDC report, will grow to an unprecedented $1.3 trillion by 2019. With this the third wave of the Internet-global proliferation of connected devices, appliances and sensors is poised to take off in 2016. In his session at @ThingsExpo, David McLauchlan, CEO and co-founder of Buddy Platform, will discuss how the ability to access and analyze the massive volume of streaming data from mil...
    WebSocket is effectively a persistent and fat pipe that is compatible with a standard web infrastructure; a "TCP for the Web." If you think of WebSocket in this light, there are other more hugely interesting applications of WebSocket than just simply sending data to a browser. In his session at 18th Cloud Expo, Frank Greco, Director of Technology for Kaazing Corporation, will compare other modern web connectivity methods such as HTTP/2, HTTP Streaming, Server-Sent Events and new W3C event APIs ...
    SYS-CON Events announced today that Men & Mice, the leading global provider of DNS, DHCP and IP address management overlay solutions, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. The Men & Mice Suite overlay solution is already known for its powerful application in heterogeneous operating environments, enabling enterprises to scale without fuss. Building on a solid range of diverse platform support,...
    Eighty percent of a data scientist’s time is spent gathering and cleaning up data, and 80% of all data is unstructured and almost never analyzed. Cognitive computing, in combination with Big Data, is changing the equation by creating data reservoirs and using natural language processing to enable analysis of unstructured data sources. This is impacting every aspect of the analytics profession from how data is mined (and by whom) to how it is delivered. This is not some futuristic vision: it's ha...
    Silver Spring Networks, Inc. (NYSE: SSNI) extended its Internet of Things technology platform with performance enhancements to Gen5 – its fifth generation critical infrastructure networking platform. Already delivering nearly 23 million devices on five continents as one of the leading networking providers in the market, Silver Spring announced it is doubling the maximum speed of its Gen5 network to up to 2.4 Mbps, increasing computational performance by 10x, supporting simultaneous mesh communic...
    The cloud promises new levels of agility and cost-savings for Big Data, data warehousing and analytics. But it’s challenging to understand all the options – from IaaS and PaaS to newer services like HaaS (Hadoop as a Service) and BDaaS (Big Data as a Service). In her session at @BigDataExpo at @ThingsExpo, Hannah Smalltree, a director at Cazena, will provide an educational overview of emerging “as-a-service” options for Big Data in the cloud. This is critical background for IT and data profes...
    With the Apple Watch making its way onto wrists all over the world, it’s only a matter of time before it becomes a staple in the workplace. In fact, Forrester reported that 68 percent of technology and business decision-makers characterize wearables as a top priority for 2015. Recognizing their business value early on, FinancialForce.com was the first to bring ERP to wearables, helping streamline communication across front and back office functions. In his session at @ThingsExpo, Kevin Roberts...
    Cognitive Computing is becoming the foundation for a new generation of solutions that have the potential to transform business. Unlike traditional approaches to building solutions, a cognitive computing approach allows the data to help determine the way applications are designed. This contrasts with conventional software development that begins with defining logic based on the current way a business operates. In her session at 18th Cloud Expo, Judith S. Hurwitz, President and CEO of Hurwitz & ...
    One of the bewildering things about DevOps is integrating the massive toolchain including the dozens of new tools that seem to crop up every year. Part of DevOps is Continuous Delivery and having a complex toolchain can add additional integration and setup to your developer environment. In his session at @DevOpsSummit at 18th Cloud Expo, Miko Matsumura, Chief Marketing Officer of Gradle Inc., will discuss which tools to use in a developer stack, how to provision the toolchain to minimize onboa...
    SYS-CON Events announced today that Interoute, owner-operator of one of Europe's largest networks and a global cloud services platform, has been named “Bronze Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2015 at the Javits Center in New York, New York. Interoute is the owner-operator of one of Europe's largest networks and a global cloud services platform which encompasses 12 data centers, 14 virtual data centers and 31 colocation centers, with connections to 195 ad...
    SYS-CON Events announced today that Alert Logic, Inc., the leading provider of Security-as-a-Service solutions for the cloud, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Alert Logic, Inc., provides Security-as-a-Service for on-premises, cloud, and hybrid infrastructures, delivering deep security insight and continuous protection for customers at a lower cost than traditional security solutions. Ful...
    Join us at Cloud Expo | @ThingsExpo 2016 – June 7-9 at the Javits Center in New York City and November 1-3 at the Santa Clara Convention Center in Santa Clara, CA – and deliver your unique message in a way that is striking and unforgettable by taking advantage of SYS-CON's unmatched high-impact, result-driven event / media packages.
    SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management...
    With an estimated 50 billion devices connected to the Internet by 2020, several industries will begin to expand their capabilities for retaining end point data at the edge to better utilize the range of data types and sheer volume of M2M data generated by the Internet of Things. In his session at @ThingsExpo, Don DeLoach, CEO and President of Infobright, will discuss the infrastructures businesses will need to implement to handle this explosion of data by providing specific use cases for filte...
    SYS-CON Events announced today that Pythian, a global IT services company specializing in helping companies adopt disruptive technologies to optimize revenue-generating systems, has been named “Bronze Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2015 at the Javits Center in New York, New York. Founded in 1997, Pythian is a global IT services company that helps companies compete by adopting disruptive technologies such as cloud, Big Data, advanced analytics, and DevO...
    SYS-CON Events announced today that Avere Systems, a leading provider of enterprise storage for the hybrid cloud, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Avere delivers a more modern architectural approach to storage that doesn’t require the overprovisioning of storage capacity to achieve performance, overspending on expensive storage media for inactive data or the overbuilding of data centers ...
    Fortunately, meaningful and tangible business cases for IoT are plentiful in a broad array of industries and vertical markets. These range from simple warranty cost reduction for capital intensive assets, to minimizing downtime for vital business tools, to creating feedback loops improving product design, to improving and enhancing enterprise customer experiences. All of these business cases, which will be briefly explored in this session, hinge on cost effectively extracting relevant data from ...