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POHow can I redirect the STDIO to a GUI component on a java app?
 

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  1. POHow can I redirect the STDIO to a GUI component on a java app?
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    <p>On C I would simple create a couple of pipes and use dup2 to overwrite the std file descriptor, while on the other end I'd create a thread for each outputing pipes (sdtout, sdterr) on a infinite loop taking advantage of the blocking IO of pipes to updated the textArea/canvas fitting the propose of a console. As for the stdin, I would listen for key events on such component, writing those to the pipe.</p> <p>But how can I perform that on Java with swing?</p> <p>I can't mix native code as a project directive. I already broke many project directives so far, so I can't push on that...</p> <p>Also it would be cool to provide some level of terminal emulation, such as VT100, but how to inform the java app of such capability, on unix I would set the TERM envvar.</p> <p>On C I would do the following:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;unistd.h&gt; #include &lt;pthread.h&gt; static pthread_t workers[2]; static void *_worker(void *file) { int c; if(!file) pthread_exit(NULL); while((c=fgetc(file))!=EOF) { // Sync and put C on the screen } pthread_exit(NULL); } int initConsole() { int stdin_pipe[2], stdout_pipe[2], stderr_pipe[2]; if(!(pipe(stdin_pipe)||pipe(stdout_pipe)||pipe(stderr_pipe))) { if(dup2(stdin_pipe[0], STDIN_FILENO)&lt;0) return -1; if(dup2(stdout_pipe[1], STDOUT_FILENO)&lt;0) return -1; if(dup2(stderr_pipe[1], STDERR_FILENO)&lt;0) return -1; pthread_create(&amp;workers[0], NULL, _worker, fdopen(stdout_pipe[0], "r")); pthread_create(&amp;workers[1], NULL, _worker, fdopen(stderr_pipe[0], "r")); // Register a handler within the toolkit to push chars into the stdin_pipe return 0; } return -1; } </code></pre>
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