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Top Forums Programming How do you detect keystrokes in canonical mode? Post 302573674 by Ultrix on Tuesday 15th of November 2011 08:33:09 AM
Old 11-15-2011
How do you detect keystrokes in canonical mode?

I'm writing a command shell, and I want to be able to detect when the user presses an arrow key (otherwise it just prints [[A, [[B, etc.). I know it's relatively easy (although somewhat more time-consuming) to detect keystrokes in noncanonical mode, but I've noticed that the bash shell detects arrow keys in canonical mode. Originally I thought that there was some process signal that the shell receives when an escaped character is entered, but I've tested all the process signals in signal.h (defined in bits/signum.h) and none of them get sent when I press the arrow keys. How can you detect arrow keys in canonical mode?
 

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exkeys(3alleg4) 						  Allegro manual						   exkeys(3alleg4)

NAME
exkeys - How to get input from the keyboard in different ways. Allegro game programming library. SYNOPSIS
#include <allegro.h> Example exkeys DESCRIPTION
This program demonstrates how to access the keyboard. The first part shows the basic use of readkey(). The second part shows how to extract the ASCII value. Next come the scan codes. The fourth test detects modifier keys like alt or shift. The fifth test requires some focus to be passed. The final step shows how to use the global key array to read simultaneous key presses. The last method to detect key presses are keyboard callbacks. This is demonstrated by installing a keyboard callback, which marks all pressed keys by drawing to a grid. SEE ALSO
END_OF_FUNCTION(3alleg4), END_OF_MAIN(3alleg4), LOCK_FUNCTION(3alleg4), SCREEN_H(3alleg4), SCREEN_W(3alleg4), acquire_screen(3alleg4), allegro_error(3alleg4), allegro_init(3alleg4), allegro_message(3alleg4), blit(3alleg4), clear_keybuf(3alleg4), clear_to_color(3alleg4), desktop_palette(3alleg4), font(3alleg4), install_keyboard(3alleg4), install_timer(3alleg4), key(3alleg4), key_shifts(3alleg4), key- board_lowlevel_callback(3alleg4), keypressed(3alleg4), makecol(3alleg4), readkey(3alleg4), rectfill(3alleg4), release_screen(3alleg4), rest(3alleg4), scancode_to_name(3alleg4), screen(3alleg4), set_gfx_mode(3alleg4), set_palette(3alleg4), textprintf_centre_ex(3alleg4), textprintf_ex(3alleg4), ureadkey(3alleg4), usprintf(3alleg4), ustrzncpy(3alleg4) Allegro version 4.4.2 exkeys(3alleg4)
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