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POJava: need to get input line while in a GUI, is only working in console
 

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  1. POJava: need to get input line while in a GUI, is only working in console
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    <p>My friends and I have written a program in Java with a GUI, made for touchscreen terminals with no keyboard/mouse. Everything occurs within the GUI, and most of the input is button presses. We want to attach a magnetic card reader (in keyboard mode) and read from a card, then perform processing based on the data from it. </p> <p>I wrote a class that works in the console, but when run through the GUI it just hangs until I alt+tab and click inside the IDE's (Eclipse's) console and swipe the card. What I'm looking for is a way to get this input w/o having to leave the GUI. </p> <p>The MCR works as if you simply typed the card info on a keyboard-- it'll send a line containing both tracks of data anywhere you could type the same line, txt document, console, whatever.</p> <p>The relevant code is as follows:</p> <pre><code>import java.util.Scanner; public class CardRead { public static void main() { String raw_card_data = ""; Scanner read = new Scanner( System.in ); System.out.println("Scan card"); // changed to an outputArea.setText for GUI raw_card_data = read.nextLine(); // works in console, not within GUI /* insert processing here */ } } </code></pre> <p>in the GUI, the code is simply:</p> <pre><code>cardreadbtn.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { CardRead.main(); } }); </code></pre> <p>I thought maybe an InputStream would work, but I've never really worked with them. I googled and found this <a href="https://stackoverflow.com/questions/309424/in-java-how-do-i-read-convert-an-inputstream-to-a-string">thread</a> : I tried integrating the suggestion about IOUtils, as follows:</p> <pre><code>InputStream is = System.in; StringWriter writer = new StringWriter(); IOUtils.copy(is, writer, null); raw_card_data = writer.toString(); System.out.println(raw_card_data); IOUtils.closeQuietly(is); IOUtils.closeQuietly(writer); </code></pre> <p>I don't know if I'm doing that right, but in the console (haven't tried in the GUI), it now says "Scan Card" and never progresses to print out raw_card_data or do anything else. "closeQuietly" I got from <a href="http://commons.apache.org/io/api-1.2/org/apache/commons/io/IOUtils.html" rel="nofollow noreferrer">here:</a></p> <p>...but again, I dunno if I'm doing it right. Never worked with apache IOUtils either.</p> <p>So I'm stuck, and I'm looking to you guys. How can I grab this card data w/o leaving the GUI to do so? </p> <p>Important note: The card data has a variable # of spaces in it (which we need to preserve), so anything like Scanner.next() won't work. The card reader is set up to send a line with both tracks separated by delimiters and then a carriage return, so .nextLine() works. The card data is also a variable # of bytes/characters.</p> <p>Also: In the first code block, the System.out.println is before a do while loop that raw_card_data = read.nextLine() is actually in (I left it out because I felt it's not relevant, but now I'm curious why it's doing this). When the println is changed to a setText() to display to a JTextArea in the GUI, it doesn't display until AFTER the card data is input in the console, even though it occurs before the do while and should execute before it. I don't understand, lol.</p>
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