键盘 Input子系统

应用层测试代码

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <linux/input.h>

#include <sys/fcntl.h>

int main(int argc, char *argv[])

{

int fd = -1;

int num;

size_t rb;

int version;

char name[20];

struct input_event ev;

int i=0;

if ((fd = open("/dev/input/event1", O_RDONLY)) < 0)  //打开设备

{

perror("open error");

exit(1);

}

while(1)

{

rb = read(fd, &ev, sizeof(struct input_event));  //读取设备

if (rb < (int)sizeof(struct input_event))  //读取错误

{

perror("read error");

exit(1);

}

if (EV_KEY==ev.type)                     //读取的是否是按键内容

{

if (1 == ev.value)                   //key1被按下

printf("key is pressed\n");

else                                                       //key1被释放

printf("key is released\n");

}

}

close(fd);

return 0;

}