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POCommunicating with a command line tool in Java
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  1. POCommunicating with a command line tool in Java
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    copied!<p>I want to use a linux command line tool from my Java program. I start the program and get the output using the Process class (<a href="http://download.oracle.com/javase/6/docs/api/java/lang/Process.html" rel="nofollow noreferrer">http://download.oracle.com/javase/6/docs/api/java/lang/Process.html</a>):</p> <pre><code> /* @param args * @throws IOException */ public static void main(String[] args) throws IOException { Process proc = Runtime.getRuntime().exec("octave"); BufferedReader reader = new BufferedReader(new InputStreamReader(proc.getInputStream())); BufferedReader errorReader = new BufferedReader(new InputStreamReader(proc.getInputStream())); BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(proc.getOutputStream())); int c; while((c = proc.getInputStream().read()) != -1) { System.out.print((char)c); } System.out.println("End"); } </code></pre> <p>I get the following output:</p> <blockquote> <p>GNU Octave, version 3.0.5 Copyright (C) 2008 John W. Eaton and others. This is free software; see the source code for copying conditions. There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, type `warranty'.</p> <p>Octave was configured for "i486-pc-linux-gnu".</p> <p>Additional information about Octave is available at <a href="http://www.octave.org" rel="nofollow noreferrer">http://www.octave.org</a>.</p> <p>Please contribute if you find this software useful. For more information, visit <a href="http://www.octave.org/help-wanted.html" rel="nofollow noreferrer">http://www.octave.org/help-wanted.html</a></p> <p>Report bugs to (but first, please read <a href="http://www.octave.org/bugs.html" rel="nofollow noreferrer">http://www.octave.org/bugs.html</a> to learn how to write a helpful report).</p> <p>For information about changes from previous versions, type `news'.</p> </blockquote> <p>The strange thing is the normal output if I run octave in the Terminal is the following:</p> <blockquote> <p>:~/workspace/Console/src/c$ octave<br> GNU Octave, version 3.0.5 Copyright (C) 2008 John W. Eaton and others. This is free software; see the source code for copying conditions. There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, type `warranty'.</p> <p>Octave was configured for "i486-pc-linux-gnu".</p> <p>Additional information about Octave is available at <a href="http://www.octave.org" rel="nofollow noreferrer">http://www.octave.org</a>.</p> <p>Please contribute if you find this software useful. For more information, visit <a href="http://www.octave.org/help-wanted.html" rel="nofollow noreferrer">http://www.octave.org/help-wanted.html</a></p> <p>Report bugs to (but first, please read <a href="http://www.octave.org/bugs.html" rel="nofollow noreferrer">http://www.octave.org/bugs.html</a> to learn how to write a helpful report).</p> <p>For information about changes from previous versions, type `news'.</p> <p>octave:1> </p> </blockquote> <p>So the characters in the line where the input is requested are not sent in my input stream. Why? Isn't it possible to detect whether input is requested? </p> <p>Thanks for your answers!</p> <p>Heinrich</p>
 

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