hid-kbd.c

来自「周立功PXA270实验箱的USB驱动」· C语言 代码 · 共 53 行

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

typedef struct input_event Myinputevent;

#define DEVICENAME "/dev/event4"
//#define DEVICENAME "/dev/psaux"//mouse0"//event0"//mouse0"

int main(int argc, char **argv)
{
	int fd;
	int n;
	Myinputevent event;
	
	fd = open( DEVICENAME , O_RDONLY, 0);	// 打开设备
	if (fd < 0)
	{
		perror("Can't open device...\n");
		exit(1);
	}
	
	while(1)
	{
		printf("Watting event ...\n\n");
	  	n = read(fd, &event, sizeof(Myinputevent) );
		
		if ( n != 16 )
		{
			perror(" Read data error! ");
			exit(1);
		}


		if(event.type == EV_KEY)
		{
			if((event.code >= KEY_ESC)&&(event.code <= KEY_UNKNOWN))
				printf("Keyboard key, the code is : %d \n",event.code);
			if(event.value) // 如果是按键事件，该值为1表示按下，为0表示松开,如果为2表示键盘按键长按。
				printf("    Press down.\n");						
			else
				printf("    Press up.\n");
		}
		
		printf("Exit , please press : Ctrl + C \n");
	}

	close(fd);
	return 0;
}