键盘测试程序

一个简单的键盘测试程序。

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <linux/input.h>



 //event设备在不同系统上需要进行更改
#define KEY_DEV "/dev/input/event2"

int main()
{
        static int fd = -1;
        static struct input_event event;

        if ( (fd = open(KEY_DEV, O_RDONLY)) < 0) {
                printf("Error open %s\n\n", KEY_DEV);
                exit(1);
        }

        while(1) {
                read(fd, &event, sizeof(event));
                if (event.type == EV_KEY)
                        printf(" type: EV_KEY, event = %d, value = %d\n", event.code, event.value);
        }

//value的值：0——释放 1——按下 2——一直按下（重复）

        return 0;
}


测试结果：

chenxibing@chenxibing-desktop:~/git/input_test$ sudo ./key_test 

  type: EV_KEY, event = 28, value = 0

  type: EV_KEY, event = 33, value = 1

f  type: EV_KEY, event = 33, value = 0

  type: EV_KEY, event = 34, value = 1

g  type: EV_KEY, event = 34, value = 0

  type: EV_KEY, event = 35, value = 1

h  type: EV_KEY, event = 35, value = 0

  type: EV_KEY, event = 29, value = 1

  type: EV_KEY, event = 46, value = 1