Terminal program in Java. Linux raw mode
in [Java Programming]
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From: Kari Laine on 8 Aug 2010 13:31 Hi, I hope someone can put me in the right direction. I am making front end to Byvac BV4626 multi IO card in Java. Part of the implementation is little terminal program. Problem is the BV4626 wants strings starting with escape. No when I read the System.in I don't get escape. This in Linux X11 and I think kterm. Problem seems to be that shell in terminal window changes what the Java program sees. I have inspected this little with google and it seems I would have to set the terminal in raw mode. Default is cooked. But all I find is asm and c examples how to do this. I would like not to have platform dependent code. Is there any way to read keyboard raw in Java? Also if there already exist a terminal program written in Java, which is GPL or BSD license - that would be optimal. Also I am after XMODEM implementation with Java. Best Regards Kari -- PIC - Microcontrollers - I2C - SPI Keypads - USB-RS232 - USB-I2C - Accessories http://www.byvac.com I am just a happy customer
From: Andreas Leitgeb on 8 Aug 2010 17:10 Kari Laine <klaine8(a)gmail.com> wrote: > I hope someone can put me in the right direction. > I am making front end to Byvac BV4626 multi IO card in Java. Part of the > implementation is little terminal program. Problem is the BV4626 wants > strings starting with escape. No when I read the System.in I don't get > escape. On Linux (and unices), you can enter a literal Esc-key, by quoting it: precede it with a (usually, unless redefined) <Ctrl>-V sequence. That way, it should be literally readable from System.in. Calling out to external program stty won't add much new platform- dependency, as switching the terminal to raw ... well, I don't think that the very concept even exists on windows command-lines. I once did something like that in a similar situation: static void raw(boolean on) { String s=on? "" : "-"; try { Runtime.getRuntime().exec(new String [] { "sh", "-c", "stty "+s+"raw </dev/tty"}).waitFor(); } catch (Exception e) {} } If you really need input of some special keys cross-platform from terminal through System.in, you can define your own meta-syntax, like \e for escape, and \\ for literal backslash... > Also if there already exist a terminal program written in Java, which > is GPL or BSD license - that would be optimal. Also I am after XMODEM > implementation with Java. Sorry, can't help with that.
From: Joshua Cranmer on 8 Aug 2010 19:48 On 08/08/2010 01:31 PM, Kari Laine wrote: > I have inspected this little with google and it seems I would have to > set the terminal in raw mode. Default is cooked. But all I find is asm > and c examples how to do this. I would like not to have platform > dependent code. Is there any way to read keyboard raw in Java? You can find some Java curses libraries, which should allow you full raw access to the keyboard in Java (basically, it allows you to make a full UI in the console). Google gets me here: <http://sourceforge.net/projects/javacurses/>. -- Beware of bugs in the above code; I have only proved it correct, not tried it. -- Donald E. Knuth
From: Arne Vajhøj on 8 Aug 2010 20:35 On 08-08-2010 17:10, Andreas Leitgeb wrote: > Kari Laine<klaine8(a)gmail.com> wrote: >> I hope someone can put me in the right direction. >> I am making front end to Byvac BV4626 multi IO card in Java. Part of the >> implementation is little terminal program. Problem is the BV4626 wants >> strings starting with escape. No when I read the System.in I don't get >> escape. > > On Linux (and unices), you can enter a literal Esc-key, by quoting it: > precede it with a (usually, unless redefined)<Ctrl>-V sequence. > That way, it should be literally readable from System.in. > > Calling out to external program stty won't add much new platform- > dependency, as switching the terminal to raw ... well, I don't think > that the very concept even exists on windows command-lines. > > I once did something like that in a similar situation: > static void raw(boolean on) { > String s=on? "" : "-"; > try { Runtime.getRuntime().exec(new String [] { > "sh", "-c", "stty "+s+"raw</dev/tty"}).waitFor(); > } catch (Exception e) {} > } > > If you really need input of some special keys cross-platform from > terminal through System.in, you can define your own meta-syntax, > like \e for escape, and \\ for literal backslash... The last suggestion sounds by far as the best solution to me! Arne
From: Kari Laine on 9 Aug 2010 02:45
On 08/09/2010 03:35 AM, Arne Vajh�j wrote: > On 08-08-2010 17:10, Andreas Leitgeb wrote: > > Arne Thanks a lot Arne ! Best Regards Kari -- PIC - ARM - Microcontrollers - I2C - SPI Keypads - USB-RS232 - USB-I2C - Accessories http://www.byvac.com I am just a happy customer |