/LGC图形渲染/访问 Linux 下的鼠标设备

访问 Linux 下的鼠标设备

作者: liuuupen

日期: 2008-09-15

简介

通过访问 /dev/input/mice 设备获取鼠标信息。

select 系统调用

代码

#include <stdio.h>

#include <fcntl.h>

#include <sys/time.h>

#include <sys/types.h>

#include <unistd.h>



int main (int argc, char **argv)

{

    int fd, retval;

    char buf[6];

    fd_set readfds;

    struct timeval tv;



    fd = open ("/dev/input/mice", O_RDONLY | O_NONBLOCK);



    if (fd < 0) {

        printf ("Failed to open /dev/input/mice /n");

        return -1;

    }

    printf ("Suceed to open /dev/input/mice.fd = %d/n", fd);



    tv.tv_sec = 5;

    tv.tv_usec = 0;



    while (1) {

        FD_ZERO (&readfds);

        FD_SET (fd, &readfds);



        retval = select (fd + 1, &readfds, NULL, NULL, &tv);

        printf ("retval = %d/n", retval);

        if (retval == 1) {

            printf ("select OK. /n");

            if (read (fd, buf, 6) <= 0) {

                printf ("Fail to read. /n");

                continue;

            }

            printf ("Button type = %d, X = %d, Y = %d./n",

                    buf[0] & 0x07, buf[1], buf[2]);

        }

    }



    close (fd);



    return 0;

}