how to run a piece of code by pressing a key and stop the code when pressed again
Attach your program to a debugger.
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You might want a thread that runs your code in a loop, but it's hard to give more specific advice with this little information.
Could you give a few more details on what you're trying to do? Eg:
- is this getting this keypress in a terminal, running in the background, some gui library?
- do you mean abort whatever long term computation you're performing, cancel some periodic check, an event driven loop?
Especially, if you have a snippet representing the idea you're trying to achieve, and the libraries you're using, if any.
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I think it depends on the OS.
On my box, (debian) the steps are pretty simple.
1 I create and executable with the code I want to execute.
2 I point my mouse to the top right corner of my desktop and find "Settings"
3 In my settings, I find "Keyboard Shortcuts"
4 Add a keyboard shortcut, and enter path to executable.
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