linux 键盘按键键码捕捉测试

捕捉linux中键盘输入对象的键码情况

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/input-event-codes.h>

const char * path = "/dev/input/event4";

int main(void)
{
   int ret;

   int fd;
   struct input_event event;

   fd = open(path,O_RDONLY);
   if(fd < 0)
   {
      perror(path);
      exit(-1);
   }

   while(1)
   {
      ret = read(fd,&event,sizeof(struct input_event));
      if(ret == sizeof(struct input_event))
      {
            if(event.type != EV_SYN)
            {
               //printf("Event: time %ld.%ld,",event.time.tv_sec,event.time.tv_usec);
               if ( event.type == 1 )
               {
                    printf("type:%d,code:%d, state:%s\n", event.type,event.code,(event.value==1? "press" : (event.value==2? "longPress" : "release")));
               }
            }
      }
   }

   close(fd);

   return 0;
}

其中，/dev/input/event4为系统中键盘对应的设备文件, 每个系统可能不一致，因此修改此文件名可以简单捕捉键盘的键码值;