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 3D 3D Photo Gallery (Part 1) 3D Photo Gallery (Part 2) Audio Poor Man's MIDI Make A Metronome iPod Tricks (Part 1) iPod Tricks (Part 2) iPod Tricks (Part 3) Laugh Track Machine Audio Player with Reverb Shepard Melody RB Phone Home Build a Drum Machine Custom Controls and Windows Double Click Listbox Draggable Metal Window Double Click Canvas Custom Buttons Custom Buttons Part II iTunes-style Listboxes Custom Controls General RB Scrolling Windows Using Mesage Dialogs Case-Sensitive Word Finder Introduction to Stacks Wiggle Window JPEG in PDF Listbox Checkboxes Background Applications Listbox Auto-Find Virtual Volumes Time Tracker Software Distribution (Part 1) Software Distribution (Part 2) Software Distribution (Part 3) Software Distribution (Part 4) Exceptions Tips and Tricks Text Clippings Made Easy Graphics Drawing a Simple Gradient The SpriteSurface: Space Game Image Spinner Cropping Graphics (Part 1) Cropping Graphics (Part 2) Cropping Graphics (Part 3) Cropping Graphics (Part 4) Shimmer Graphics Lissajous Figures Simple Screen Capture Vector Graphics Kaleidoscope Images Stegonography Spirals! Image Table RB Magnifying Lens Screen Capture Color Picker Tutorial Hacks Ghost Grab Speedy Mouse Extension iTunes Plugins iTunes Skinner Mac OS X Global Hot Key Event (Carbon Events) Login Welcomer (Carbon Events) Add/Remove Buttons Resizable Sheets Mac OS X Preferences Window Using Sheets in REALbasic Build a Bundle (Part 1) Build a Bundle (Part 2) Dock Your Passwords Mac OS X Debugging REALbasic Mac OS X Icon Tutorial Animate Your Dock RB and the Command Line Menus Window Menu Templates Menu Listbox Menu Novelty Guessing Game Calendar Trivia Tile Mixer Zip Code Finder Happy Valentine's Day Merlin Simulator (Part 1) Merlin Simulator (Part 2) Merlin Simulator (Part 3) Buzzword Machine AppleSoft BASIC Printing Print to PDF Registration Registration Code Validation Network Registration Codes Resources Picture Extractor (Part 1) Picture Extractor (Part 2) Serial Caller ID (Part 1) Caller ID (Part 2) Caller ID (Part 3) Speech Speech Recognition Socket Communication Easy Peer-to-Peer File Sharing MacPAD Version Checking Display Web Image In Canvas HTML IMG Tags Version Tracking Even Smarter Instant Messaging Web Tiler JavaScript and REALbasic Stock Ticker (Part I) Stock Ticker (Part 2) AIM Mate XML Manipulation Simple XML Introduction Video Big Brother Video Capture Note: All articles without a byline were written by Erick Tejkowski. When cleaning the site I removed them because the code differed from page to page, and I have yet to put them back in.
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This week we'll begin the process of creating a stock ticker. There are already many stock tickers and stock quote web sites out there, but hopefully this project will give you some other ideas for what you can do with REALbasic. This project will appear in two parts. This week (Part 1), we will build a project to retrieve a single quote. Next week, we'll integrate the stock information into a fancy display. For this project, I am going to try something new for the RB section of ResExcellence. In the past, I listed all tutorial code as text. Starting today, I am going to begin using graphics to display the code. My original intent was that you could copy and paste the code as you worked through the tutorial. Since you can download the completed code anyway (which I suspect most of you do), screenshots of the code offer some advantages. First, the source code will more closely match the REALbasic you use (correct colors, spacing, etc...). Secondly, it saves me a lot time, which can only mean more time for tutorials and REALbasic news for you. Now, on to the tutorial! Preparation Before you get started coding, download Dan Vanderkam's HTTPSocket Class. We'll use it to handle the transfer of stock data from the internet. Once you have it downloaded and unstuffed, launch REALbasic and drag the file named "httpSocket (complete)" from the Finder into the Project Window, like so: 
Don't worry that the name changes to "httpSocket" in the Project window; this is normal behavior. Build the Interface Open the Window Editor by double-clicking Window1 in the Project Window. Drag httpSocket from the Project Window into Window1. Next, add the controls listed below, making sure to change any Properties listed in the "Settings" column.
You may rearrange the interface however you see fit, but it might look something like this: 
Add the Code The idea behind this tutorial is that we will download a web page using the httpSocket and then retrieve the information we want from the page. For our example, we will use Yahoo's stock lookup. For an example, check Apple's stock (AAPL). Look closely at the URL. The stock symbol is embedded in it. Once you have looked at the web page, save it as an HTML file and open it in a text editor. If you are HTML-literate, scroll down and find the table where the stock quote is located. This is the data we want to retrieve from the page. The code this week will:
Before you add any code, create a new Property in Window1, like so: 
Now, the code. To begin, open the Code Editor for Window1 and navigate to its Open event. Add the following code: 
Next, navigate to the Action event of PushButton1 and enter this code: 
Finally, open the DLFinished event of httpSocket1 and finish off the project with this code: 
Conclusion That's it! Test the project and when you're happy with the results, build the final application. To spruce things up, feel free to resize Window1 to conceal the EditFields. As usual, you can download the application and completed project. |
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