How to get the bytes of a control character in Java

Question

I need to get the bytes of the control character STX (02h) to append to a stream I need to send to a controller board.

How do I get the bytes of the STX control character in Java?

Would this post help you out? http://stackoverflow.com/questions/5513144/converting-char-to-byte — Cao Jing, Feb 18 '15 at 19:19
STX is a single character in ASCII, not represented by the literal "STX". — Roy Hinkley, Feb 18 '15 at 19:22

score 2 · Accepted Answer · edited Jul 09 '21 at 15:43

2

The bytes of the control character depend on the encoding the controller board uses. For ASCII:

"\u0002".getBytes(StandardCharsets.US_ASCII);

Note that if you are writing characters to an output stream, you should wrap it with a Writer which is configured with the correct encoding:

OutputStream controllerOutputStream;
Charset controllerCharset = StandardCharsets.US_ASCII; // probably ASCII
Writer controllerWriter = new OutputStreamWriter(controllerOutputStream, controllerCharset);

controllerWriter.append('\u0002'); // append a single character

edited Jul 09 '21 at 15:43

Mark Rotteveel

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answered Feb 18 '15 at 19:23

Adrian Leonhard

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That may or may not work depending on your platform's default charset, and whether the controller board uses the same. – RealSkeptic Feb 18 '15 at 19:23
First, it's `getBytes()`, not `toBytes()`. Second, not in `utf-16`. – RealSkeptic Feb 18 '15 at 19:27
@AdrianLeonhard - This worked - THANX!!! The board does use that standard ASCII characters. – Roy Hinkley Feb 18 '15 at 19:30
@RealSkeptic You're right, of course, I improved my answer. – Adrian Leonhard Feb 18 '15 at 19:31

How to get the bytes of a control character in Java

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