用C語言在Linux下獲取鼠標光標的相對位置

用C語言在Linux下獲取鼠標光標的相對位置代碼分享：

1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <linux/input.h>
4. #include <fcntl.h>
5. #include <sys/time.h>
6. #include <sys/types.h>
7. #include <sys/stat.h>
8. #include <unistd.h>
11. int main(int argc,char **argv)
12. {
13. int fd, retval;
14. char buf[6];
15. fd_set readfds;
16. struct timeval tv;
18. //fd = open("/dev/input/mice", O_RDONLY);
19. if(( fd = open("/dev/input/mice", O_RDONLY))<0)
20. {
21. printf("Failed to open \"/dev/input/mice\".\n");
22. exit(1);
23. }
24. else
25. {
26. printf("open \"/dev/input/mice\" successfuly.\n");
27. }
29. while(1)
30. {
31. tv.tv_sec = 5;
32. tv.tv_usec = 0;
34. FD_ZERO(&readfds);
35. FD_SET(fd, &readfds);
37. retval = select(fd+1, &readfds, NULL, NULL, &tv);
38. if(retval==0)
39. printf("Time out!\n");
40. if(FD_ISSET(fd,&readfds))
41. {
42. if(read(fd, buf, 6) <= 0)//終端設備，一次只能讀取一行
43. {
44. continue;
45. }
46. printf("Button type = %d, X = %d, Y = %d, Z = %d\n", (buf[0] & 0x07), buf[1], buf[2], buf[3]);
47. }
48. }
49. close(fd);
50. return 0;
51. }