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Hooking Up a Smartphone App to IBM i

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Use Sencha Touch and JSON/JSONP to talk to your RPG programs.

 

In my previous article on distributing mobile apps within your enterprise, we opened by discussing the difference between web-based mobile appsessentially websites optimized for use on smartphonesand "native" apps that can be installed directly onto a smartphone. We then walked through the steps of registering with Apple, creating a standalone iPhone app using Sencha Touch and Phone Gap, and then installing the app onto an iPhone.

 

Today we'll take this concept a step further by getting our generic Sencha Touch-based smartphone app (which we called "MyFirstApp") to talk to an RPG program on IBM i and retrieve customer data. To do this, we'll pick up where we left off with the following steps:

 

  1. Prepare the IBM i for communication with our smartphone app.
  2. Set up an RPG program to "serve" data to the app.
  3. Adjust the app to ask for and retrieve data from the RPG program.

Step 1: Prepping Your IBM i

Up to now, our attention has been focused on the front-end app and hardware/software. Now that we're looking to communicate with an RPG program, we need to take a look at the back-end, the IBM i piece.

 

Since we'll be using IBM i's built-in Apache Server to serve up our data here, for sake of simplicity I'm going to assume you have installed the free Valence Framework (which you can download from here). The Valence installation routine automatically configures and initiates an Apache server instance on your IBM i called VALENCE32. It also installs a collection of test data (in our case, a sample customer master file called DEMOCMAST) and a service program we can use in any RPG program to send and receive data through the Apache Server. This will save us a lot of prerequisite setup and coding for this exercise.

 

Once your Apache server instance is set up, you'll need to tell the Apache Server it's okay for certain RPG programs to be called directly from external devices or web pages. Note that what we're doing for this example is not necessarily the approach you'd want to take for all your programs. I wouldn't generally recommend giving your Apache Server a long list of RPG programs for external access, but rather just a limited one or two programs that serve to verify a user's authority and then call other programs, essentially working as RPG-based traffic cops. This, by the way, is essentially how the Valence Portal works.

 

To edit the Apache server instance, you should be able to get to the configuration page by navigating your browser to http://192.168.1.1:2001/HTTPAdmin (replacing 192.168.1.1 with the address of your IBM i). If this doesn't appear to be working, verify the Apache Administration instance is running by typing this command at a command line:

 

STRTCPSVR SERVER(*ADMIN)

 

After you've successfully logged in with your IBM i user and password, click on the "Manage" tab, select the "VALENCE32" server instance, click the "Manage Details" button at the bottom, and then click the "Edit Configuration File" at the bottom left. Scroll down to the section labeled "# valence program directives" and add the following line:

 

ScriptAliasMatch /valence(.*)/exgridall2.pgm /QSYS.LIB/VALENCE32.LIB/EXGRIDALL2.PGM

 

01-22-14Swansonfigure1 HTTP admin

Figure 1: See the Apache Server configuration changes.

 

This tells Apache to route any calls to "exgridall2.pgm"which we'll be doing in Step 3to a program in the VALENCE32 library called EXGRIDALL2, an RPG program we'll be creating in Step 2.

 

Save these changes, and then restart the VALENCE32 instance by hitting the red stop button followed by the green play button. Alternatively, you could also restart the server instance from a command line by executing this command:

 

STRTCPSVR SERVER(*HTTP) RESTART(*HTTP) HTTPSVR(VALENCE32).

Step 2: Set Up an RPG Program to Provide Data

Now that we've got the Apache Server set up, we're ready to create an RPG program to communicate with our smartphone app. To keep this simple, we're going to take one of the example apps included with Valence and make a one-line modification so it will work with our smartphone app.

 

Using PDM, RDi, or your favorite RPG source editor, make a copy of source member EXGRIDALL (located in library VALENCE32, file QRPGLESRC) and call it EXGRIDALL2 (matching what we specified in the Apache configuration in Step 1). Then go into the source and, just prior to the "vvOut_execSQLtoJSON" procedure call, add the following line:

 

vvOut.jsonp = '1';

 

01-22-14Swansonfigure2 RPG code

Figure 2: The RPG program EXGRIDALL2 shows the Javascript Object Notation with Padding (JSONP) addition.

 

Save this change. Then, with VALENCE32 in your library list, compile the program. With this program created, you're ready to set up the smartphone app to call it. But before we do that, let's talk about what we're doing in this program, its sole purpose being to use the VVOUT Valence service program procedure to send data to the web. The first line after "/free" sets a root name for the set of data, which we'll be looking for in Step 3. The third line executes the VVOUT_ExecSQLtoJSON procedure that takes the results of an SQL statement and sends them, in JSON format, to a device on the web (in this case, to our smartphone app).

 

The second line, the one we just added, tells the VVOUT procedure to encode the response in a format called JavaScript Object Notation with Padding (JSONP). This is needed for development and testing purposes. When we're making changes to our app and testing it, we're using our own PC's local web server to execute it. In order for the app running in this domain (your PC's local web server) to communicate with another domain (your IBM i), we must use JSONP instead of standard JSON. Without getting too deep in the weeds here, JSONP is essentially JSON with a little extra code. It allows you to specify what's referred to as a "callback function" that is passed on with your JSON object, so the JSON code is transported and then "executed" from a different domain. Don't worry if this seems a little confusing right now. The bottom line is that JSONP allows you to run AJAX across different domains, something browsers normally prohibit as a violation of Same-origin policy.

Step 3: Adjust the Smartphone App

The final step is to add some code to the app so it can pull in data from our IBM i. To do this, we'll add some logic to the "MyFirstApp" we created in the previous article so that it calls our RPG program and shows the response in a simple list format. For sake of example, we'll also throw in some code to listen for a tap event so that touching on any customer record will bring up a window with some additional info on that customer. The JavaScript code we're working with here is using Sencha Touch APIs, the syntax of which goes beyond the scope of this article, but you can read about how it all works in the API documentation located here.

 

Using your favorite source editor, open up the front-end JavaScript source file Main.js (located in the app/view folder) and make the following changes:

 

(1) Replace the "requires" section with the following code:

   requires: [

       'Ext.TitleBar',

       'Ext.dataview.List',

       'Ext.data.Store'

   ],

This tells Sencha Command to include these components when packaging up the app.

 

(2) Remove the "Get Started" section of code, 17 lines total, beginning with the line containing a single open bracket ({). We're going to replace this button entirely.

 

(3)   Add the following code in place of what was removed in (2) above:

{

   title: 'List Custs',

   iconCls: 'list',

   items: [

       {

           docked: 'top',

           xtype: 'titlebar',

           title: 'Customers'

       },

       {

           xtype: 'list',

           itemTpl: '{CUSNO} - {CNAME}',

           height: '100%',

           store: Ext.create("Ext.data.Store", {

               fields: ['CUSNO', 'CNAME', 'CADDR1', 'CADDR2', 'CCITY', 'CSTATE', 'CZIP'],

               proxy: {

                   type: 'jsonp',

                    url: 'http: //192.168.1.1:7032/valence/exgridall2.pgm',

                   reader: {

                       type: 'json',

                       rootProperty: 'DEMOCMAST'

                  }

               },

               autoLoad: true

           }),

           listeners: {

               itemtap: function(me, i, t, r){

                   Ext.Msg.alert('Customer '+r.get('CUSNO'),

                   r.get('CNAME')+'<br>'+r.get('CCITY')+' '+r.get('CSTATE')+' '+r.get('CZIP'));

               }

           }

       }

   ]

 

Be sure to replace the 192.168.1.1 section with the IP address of your own IBM i. This new code adds a button labeled "List Custs" that, when hit, calls your modified EXGRIDALL2 program from Step 2. It looks for a response with a root of "DEMOCMAST" (as set in the RPG program) and then lists the customer numbers and names in a list. Tapping on any record in the list will bring up additional details about that record. The modified front-end code should look like this:

 

01-22-14Swansonfigure3 JS code

Figure 3: The Sencha Touch source file Main.js shows new code for listing customers.

 

Save these changes and you should be able to test the new code by running the app from your PC via http://localhost/MyFirstApp/index.html. The resulting page should resemble what shows in Figure 4. The last thing to do is rebuild and redeploy the app using Phone Gap Build, as explained in the previous article steps 2 through 4.

 

01-22-14Swansonfigure4 app screenshot

Figure 4: The modified MyFirstApp shows customers from RPG program EXGRIDALL2.

 

And with that under your belt, you're on track to creating your own smartphone apps that interact with RPG programs on your IBM i. Try not to be dissuaded if some of the front-end code seems a bit foreign to you as an RPG programmer. There is indeed much to learn in the world of web and mobile app development, but I've found the best way to get the hang of this is to simply dive in and get the rote process down through practice, trying slightly different variations as you go. The more you do this, the sooner you'll start to pick up on the mechanics and syntax of this type of programminga skill set that will ultimately make for a fantastic complement to your RPG repertoire.

 

Robert Swanson

Robert Swanson has worked as a developer on IBM i (and its predecessors of various names) since 1992, with an early emphasis on extending legacy ERP functionality beyond traditional office settings and into shop floor environments, where computer terminals tended to be less conventional.

 

With a background in industrial engineering, Rob spent many years championing the concept of weaning manufacturing and distribution operations from "off-line" reports and spreadsheets to real-time IBM i-based applications that enabled plant workers to interact electronically with office personnel. As the web world evolved and matured, the medium of choice has gradually switched from green-screen programs to browser-based applications.

 

Now a Senior Partner at CNX Corporation in Chicago, Rob works as an advocate for introducing Web 2.0-style desktop and mobile apps to IBM i shops, not only to increase user productivity but to bolster the image of IBM i as a world-class application server. CNX is behind the Valence Web Framework for IBM i, available for free download to the IBM i community as a tool for RPG programmers to interface their programs with Ext JS and Sencha Touch-based front ends. 

 

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    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.