The following c-program reads a single keystroke without enter. Output is the key and its ascii-value. The keys are read in a loop that is interrupted by the #-sign. Note that this is not trivial.
#include <stdio.h>
#include <termios.h>
#include <string.h>
int kbhit(void);
int kbhit(void) {
struct termios term, oterm;
int fd = 0;
int c = 0;
tcgetattr(fd, &oterm);
memcpy(&term, &oterm, sizeof(term));
term.c_lflag = term.c_lflag & (!ICANON);
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 1;
tcsetattr(fd, TCSANOW, &term);
c = getchar();
tcsetattr(fd, TCSANOW, &oterm);
if (c != -1)
ungetc(c, stdin);
return ((c != -1) ? 1 : 0);
}
int getch();
int getch()
{
static int ch = -1, fd = 0;
struct termios neu, alt;
fd = fileno(stdin);
tcgetattr(fd, &alt);
neu = alt;
neu.c_lflag &= ~(ICANON|ECHO);
tcsetattr(fd, TCSANOW, &neu);
ch = getchar();
tcsetattr(fd, TCSANOW, &alt);
return ch;
}
int rechne(char v);
int rechne(char v) {
int vback;
vback = v;
return vback;
}
int main() {
char c;
int interr;
interr = 1;
do {
do {
c = getch();
if (c == '#') {
interr = 0;
break;
}
int wert;
wert = rechne(c);
printf("char '%c' key '%d'\n", c, wert);
}
while(kbhit());
}
while(interr);
printf("programmende\n");
return 0;
}
Solid Experiments 