Re: question about gcc and keyboard hadling

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Mon, 2002-08-05 15:43:18 +0100, Glynn Clements <glynn.clements@virgin.net>
wrote in message <15694.36614.996185.222692@cerise.nosuchdomain.co.uk>:
> 
> +Rudymartin wrote:
> 
> > im trying to develop a text editor using gcc version 2.96 20000731 (Red Hat 
> > Linux 7.1 2.96-81) , and thats because I want to make some experience with 
> > C++ (I used to program in Java and C under windowz) The Info pages have 
> > information about most libraries and functions but I have found no way to 
> > trap the modifiers keys (ALT/CTRL/SHIFT) under a terminal. And I noticed 
> > emacs can trap those keys under a terminal.
> 
> You can't get the same kind of modifier behaviour on a terminal that
> you can in a windowed environment.

Well... It's not exactly portable, but you (at least) can get Ctrl, Alt
and Shift running Linux at the Console. I don't know in which way this
interacts with ncurses (definitely, it _will_ interact on input), but
you can do eg.:

#include <stdio.h>
#include <fcntl.h>
#include <linux/kd.h>
#include <possibly/others.h>

struct termios tio_old;
struct termios tio_new;
int old_mode;
char one_byte;

fd=open("/dev/tty", O_RDONLY);
tcgetattr(fd, &tio_old);
tcgetattr(fd, &tio_new);
ioctl(fd, KDGKBMODE, &old_mode);
ioctl(fd, KDSKBMODE, K_MEDIUMRAW);
tio_new.c_lflag	&= ~(ICANON|ECHO|ISIG);
tio_new.c_iflag = 0;
tio_new.c_cc[VMIN] = 1;
tio_new.c_cc[VTIME] = 1
tcsetattr(fd, TCSANOW, &tio_new);
tcflush(fd, TCIOFLUSH);

while(read() == sizeof(one_byte)) {
	/* Process Input, will show Alt, Shift and Ctrl*/;
	if(dont_need_to_do_more_work)
		break;
}

ioctl(fd, KDSKBMODE, old_mode);
tcsetattr(fd, TCSANOW, &tio_old);
tcflush(fd, TCIOFLUSH);

close(fd);

However - not easily portable:-(

MfG, JBG

-- 
Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
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