keypressed() function

[pinkfloydhomer]

I need a function (blocking or non-blocking) that tells me if a key has
been pressed (even before it has been released etc.). Also, I would of
course like to know _which_ key has been pressed.

I know that this probably does not exist in the Python library already
as a platform-independant abstraction (even though it probably could),
but then I would at least like solutions that works on Windows and on
Linux.

/David

 

[robert]

I need a function (blocking or non-blocking) that tells me if a key has
been pressed (even before it has been released etc.). Also, I would of
course like to know _which_ key has been pressed.

I know that this probably does not exist in the Python library already
as a platform-independant abstraction (even though it probably could),
but then I would at least like solutions that works on Windows and on
Linux.

/David

Its a terminal I/O function - not a platform function. E.g. On Win only in a rough console msvcrt.kbhit() does it. In PythonWin, IPython, Crust ... things are of course different.
On regular Unix terminals you have the sys.stdin file:

sys.stdin.read(1) #maybe in a thread and interthread-pass it to your main loop

or possibly trick with fcntl.fcntl(sys.stdin, fcntl.F_SETFL, os.O_NDELAY|os.O_NONBLOCK)

when nothing is on sys.stdin - you get immediately an IOError:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
IOError: [Errno 11] Resource temporarily unavailable


And see also other ioctl, termios, tty, cbreak, curses .. functions to get things early before \n buffering depending on the terminal mode )


Robert

 

[Gabriel Genellina]

I need a function (blocking or non-blocking) that tells me if a key has
been pressed (even before it has been released etc.). Also, I would of
course like to know _which_ key has been pressed.

On Windows you can listen to the messages WM_KEYDOWN/WM_KEYUP.
Or, for a specific key, you can use GetKeyState/GetAsyncKeyState. For
the whole keyboard use GetKeyboardState.


--
Gabriel Genellina
Softlab SRL






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[=?ISO-8859-1?Q?BJ=F6rn_Lindqvist?=]

I know that this probably does not exist in the Python library already

as a platform-independant abstraction (even though it probably could),
but then I would at least like solutions that works on Windows and on
Linux.

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/134892

But it is blocking.

 

[Ravi Teja]

I need a function (blocking or non-blocking) that tells me if a key has
been pressed (even before it has been released etc.). Also, I would of
course like to know _which_ key has been pressed.

I know that this probably does not exist in the Python library already
as a platform-independant abstraction (even though it probably could),
but then I would at least like solutions that works on Windows and on
Linux.

Hmm.. 2 questions on this today. On Windows PyHook will work. It
signals for both Key Up and Key Down events. However it is a Windows
only module making use of very platform specific API. I am not sure if
there is an equivalent for Linux.