linux下面实现检测按键（Linux中kbhit（）函数的实现）

 在linux下面实现检测按键（Linux中kbhit（）函数的实现）

#include <stdio.h>

#include <termios.h>
#include <term.h>
#include <curses.h>
#include <unistd.h>
#include  <stdlib.h>
static struct termios initial_settings, new_settings;
static int peek_character = -1;
void init_keyboard();
void close_keyboard();
int kbhit();
int readch();


int main()
{
    int ch = 0;
    init_keyboard();
    while(ch != 'q') {
        printf("looping\n");
        sleep(1);
        if(kbhit()) {
            ch = readch();
            printf("you hit %c\n",ch);
        }
    }
    close_keyboard();
    exit(0);
return 0;
}


void init_keyboard()
{
    tcgetattr(0,&initial_settings);
    new_settings = initial_settings;
    new_settings.c_lflag &= ~ICANON;
    new_settings.c_lflag &= ~ECHO;
    new_settings.c_lflag &= ~ISIG;
    new_settings.c_cc[VMIN] = 1;
    new_settings.c_cc[VTIME] = 0;
    tcsetattr(0, TCSANOW, &new_settings);
}
void close_keyboard()
{
    tcsetattr(0, TCSANOW, &initial_settings);
}


int kbhit()
{
    char ch;
    int nread;
    if(peek_character != -1)
        return 1;
    new_settings.c_cc[VMIN]=0;
    tcsetattr(0, TCSANOW, &new_settings);
    nread = read(0,&ch,1);
    new_settings.c_cc[VMIN]=1;
    tcsetattr(0, TCSANOW, &new_settings);
if(nread == 1) {
      peek_character = ch;
      return 1;
}
return 0;
}


int readch()
{
    char ch;
    if(peek_character != -1) {
        ch = peek_character;
        peek_character = -1;
        return ch;
    }
    read(0,&ch,1);
    return ch;

}

方法二：

 //用非阻塞io
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>
int kbhit(void)
{
struct termios oldt, newt;
int ch;
int oldf;
tcgetattr(STDIN_FILENO, &oldt);
newt = oldt;
newt.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &newt);
oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
fcntl(STDIN_FILENO, F_SETFL, oldf);
if(ch != EOF)
{
ungetc(ch, stdin);
return 1;
}
return 0;
}
int main(void)
{
while(!kbhit())
puts("Press a key!");
printf("You pressed '%c'!/n", getchar());
return 0;
}