random keypress bounce in a terminal

[=?ISO-8859-2?Q?Istv=E1n?=]

Hi all,
I'm a novice in the world of Python and to begin with something useful I
want to create a small tool for my microcontroller work. So I wrote a
binary file compare (called bfc). It is just a few lines and put here
with two sample files: http://www.evoran.hu/tmp
I have found a keypress handler and built into my program. It works fine
as long as I hit keys normally, but gives extra characterts if I keep
pressing some key, e.g. up or down arrow keys. It runs on a Linux system.
What's the wrong with it?
Thanks for any help,
István

 

[Bjoern Schliessmann]

It works fine as long as I hit keys normally, but gives extra
characterts if I keep pressing some key, e.g. up or down arrow
keys. It runs on a Linux system. What's the wrong with it?

Nothing. Linux VTs will generate multiple characters for special
keys.

Regards,


Björn

 

[=?ISO-8859-1?Q?Istv=E1n?=]

Bjoern Schliessmann írta:

István wrote:



Nothing. Linux VTs will generate multiple characters for special
keys.

I know it and I do handle it:
ch = sys.stdin.read(1)
if (ord(ch)==27):
chstr=ch
chstr+=sys.stdin.read(1)
chstr+=sys.stdin.read(1)
else:
chstr=ch
Moreover, I would also state for others: the behavior of this code is
independent of the keyboard repeating rate.
But what if it _seems_ to work differently...?
That's the reason of trying to make somebody just to see him/herself the
symptom.
* bfc.py 4863 bytes <http://evoran.hu/tmp/bfc.py>*
* uni_getch.py 873 bytes <http://evoran.hu/tmp/uni_getch.py>*
* demo1.brd 84311 bytes <http://evoran.hu/tmp/demo1.brd>*
* demo2.brd 84336 bytes <http://evoran.hu/tmp/demo2.brd>
http://www.evoran.hu/tmp/
*Please, check somebody and explain how is possible what is impossible....
Istvan

 

[Bjoern Schliessmann]

Moreover, I would also state for others: the behavior of this code
is independent of the keyboard repeating rate.

Sure, it's not multiple keypresses but a sequence generated by the
VT code in the kernel.

But what if it _seems_ to work differently...?
That's the reason of trying to make somebody just to see
him/herself the symptom.
* bfc.py 4863 bytes <http://evoran.hu/tmp/bfc.py>*
* uni_getch.py 873 bytes <http://evoran.hu/tmp/uni_getch.py>*
* demo1.brd 84311 bytes <http://evoran.hu/tmp/demo1.brd>*
* demo2.brd 84336 bytes <http://evoran.hu/tmp/demo2.brd>
http://www.evoran.hu/tmp/
*Please, check somebody and explain how is possible what is
impossible.... Istvan

Check what? What's impossible?

Regards,


Björn