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Old 02-16-2009, 06:29 PM   #1
CoderMan
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Question control characters in C


Hi. I'm working on my ncurses application, written in C. I get user input through a loop which uses getchar(). I was able to recognize Ctrl-n by comparing the keypress to ASCII character 16, and this seems to work fine.

However, if I noticed that the ASCII character for Ctrl-j (10) is the same as the Line Feed. I tested this, and if I press enter on the keyboard I get the same ASCII value as when I press Ctrl-j.

So, what do I do if I want Ctrl-j to mean something different in my program than pressing enter?

The ncurses terminal mode is set to raw, with a 100 millisecond timeout, and keypad is on (I'm already using the up and down arrow-keys).
 
Old 02-16-2009, 08:17 PM   #2
wje_lq
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what do I do if I want Ctrl-j to mean something different in my program than pressing enter?
If you're using ncurses, you need a different (i.e., wildly nonstandard) keyboard, or load your keyboard with a different set of characters somehow, of which I'm completely ignorant.

Unless you're willing to get raw keycodes (not raw characters, as you're getting now), ^J and <Enter> (or however that key is labeled on your keyboard) yield the same value exactly.
 
  


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