getkeyboard.cpp

#include <signal.h>
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
namespace key{
#define KEYCODE_R 0x43
#define KEYCODE_L 0x44
#define KEYCODE_U 0x41
#define KEYCODE_D 0x42
#define KEYCODE_Q 0x71

int kfd = 0;
struct termios cooked, raw;

void quit(int sig)
{
  (void)sig;
  tcsetattr(kfd, TCSANOW, &cooked);//在程序结束时在恢复原来的配置
}

int keyLoop()
{
  char c;

  // get the console in raw mode
  tcgetattr(kfd, &cooked); // 得到 termios 结构体保存，然后重新配置终端
  memcpy(&raw, &cooked, sizeof(struct termios));
  raw.c_lflag &=~ (ICANON | ECHO);
  // Setting a new line, then end of file
  raw.c_cc[VEOL] = 1;
  raw.c_cc[VEOF] = 2;
  tcsetattr(kfd, TCSANOW, &raw);

  // get the next event from the keyboard
  if(read(kfd, &c, 1) < 0)
  {
    perror("read():");
    exit(-1);
  }

  switch(c)
  {
    case KEYCODE_L:
      // printf("LEFT\n");
      return 75;
      break;
    case KEYCODE_R:
      // printf("RIGHT\n");
      return 77;
      break;
    case KEYCODE_U:
      // printf("UP\n");
      return 72;
      break;
    case KEYCODE_D:
      // printf("DOWN\n");
      return 80;
      break;
        default:
              // printf("value: %c = 0x%02X = %d\n", c, c, c);
              return c;
  }
}

int getkey(){
  signal(SIGINT,quit);

  return keyLoop();
}
}