Linux C中读取/dev/input/event设备来判断键盘按键是否按下

code：

 

1. #include

2. #include

3. #include

4. #include

5. #include

6. #include

7.  

8. #define DEV_PATH "/dev/input/event2" //difference is possible

9.  

10. int main()

11. {

12. int keys_fd;

13. char ret[2];

14. struct input_event t;

15. keys_fd=open(DEV_PATH, O_RDONLY);

16. if(keys_fd <= 0)

17. {

18. printf("open /dev/input/event2 device error!\n");

19. return -1;

20. }

21. while(1)

22. {

23. if(read(keys_fd, &t, sizeof(t)) == sizeof(t))

24. {

25. if(t.type==EV_KEY)

26. if(t.value==0 || t.value==1)

27. {

28. printf("key %d %s\n", t.code, (t.value) ? "Pressed" : "Released");

29. if(t.code == KEY_ESC)

30. break;

31. }

32. }

33. }

34. close(keys_fd);

35. return 0;

36. }

运行效果截图：

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