hi i a newbie in game studio, im having trouble finding a easy thing like detect the state of a key, for example i want to run a function when i released the space key.

for example i want to turn a light on or off when the user press space but just when he release it, because if he keeps pressing down the key the function is calling a lots of times.

So how i detect when i released the key pressed?

that's simple:

on_space=light_on;

IMPORTANT: when using the on_... (on_enter,on_f1 (that works for every key))
the function (in this case) light_on will just called once if you press the key. So you don't have the problem, that the function will called more than once per keypress.
and you just have to call it once, or if you want to bind the key to another function. And you can't use brackets: on_space=light_on(); doesn't work

i hope this helps you

Kartoffel

AFAIK on_space is called each frame while space is pressed, not only once.

I'd do something like this:
while(!key_space) wait(1);
turn_the_light_on();
while(key_space) wait(1);
turn_the_light_off();

on_space is called only one.
key_space is called every frame

@widi key_space is not a function it's a variable

You can also use key_hit for detecting the moment when the key is pressed down, thats in the keys.c library.

if(key_hit("a")) ....

is different to

if(key_a) ...

which is true as long as the key is pressed down.