[Tutor] A little help please
Wed, 26 Dec 2001 16:27:06 -0000
> I'm in need of a function that will work on both a linux box and a
> windows box that, from the command line, will detect a key hit
> on the keyboard.
There is no portable way of doing this(*) in standard Python but
you can do it by using two distinct modules:
msvcrt for Windows and curses for Linux
They both have similar getch() functions and you could test
for the OS at the top of the function. Something like:
if os == windows or NT or DOS:
elif os == posix:
else: return raw_input() # don't know how to read instant keys...
I suspect you will need to write an init function for the
curses stuff to set up the virtual screen that cureses uses.
Note that the functions will wait for input (ie not like
BASIC INKEY$) but do not wait for an ENTER key.
> -1 for no key hit detected and the ascii code for any other
> key hit.
To get the -1 for no key hit you will need to do something
clever to arrange a timeout.... Maybe launching a thread
then killing it after a delay, thats getting trickier...
> of this function would be function keys.
The msvcrt.getch works with function keys etc, I don't
remember how curses.wgetch works.
You might like to take a peek at my online tutor under
Event Driven programming to see an example, if you can
find a copy of my book even better since it shows
msvcrt.getch in action.
(*) Fred Lundh has a console module that tries to be OS
independant but I can't recall if it has a getch function.