dynamic generate command line parameters for qt embedded application

最新推荐文章于 2021-12-11 00:34:34 发布

原创最新推荐文章于 2021-12-11 00:34:34 发布 · 478 阅读

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Read the fucking source code below.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <linux/input.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#define DIR_PATH   "/dev/input"
#define NODE_PREFIX   "event"
int main(int argc,char **argv)
{
   DIR *tdir;
   struct dirent *tdirent;
   struct input_event tevent;
   unsigned int evbit;
   int fd;
   unsigned char event_node_name[32];
   int node_prefix_len=strlen(NODE_PREFIX);
   int ret;
   int valid_cnt=0;
   int event_type;
   //check input parameters.
   if(argc<2)
   {
       printf("usage:%s <0/1>\n",argv[0]);
       printf("<0>: scan mouse event nodes\n");
       printf("<1>: scan keyboard event nodes\n");
       return -1;
   }
   if(!strncmp(argv[1],"0",1))
   {
       event_type=EV_REL;
   }else if(!strncmp(argv[1],"1",1))
   {
       event_type=EV_KEY;
   }else{
       printf("error:invalid scan type!\n");
       return -1;
   }
   tdir=opendir(DIR_PATH);
   if(!tdir)
   {
       printf("open dir failed!\n");
       return -1;
   }
   while((tdirent=readdir(tdir))!=NULL)
   {
       if(!strncmp(tdirent->d_name,NODE_PREFIX,node_prefix_len))
       {
           sprintf(event_node_name,"%s/%s",DIR_PATH,tdirent->d_name);
           //printf("%s,",event_node_name);
           fd=open(event_node_name,O_RDONLY);
           if(fd<0)
           {
               printf("open event node failed:%s\n",strerror(errno));
               continue;
           }
           ret=ioctl(fd,EVIOCGBIT(0,EV_MAX),&evbit);
           if(evbit&(0x1<<event_type))
           {
               printf("%s\n",event_node_name);
               valid_cnt++;
           }
           close(fd);
       }
   }
   closedir(tdir);
   return valid_cnt;
}

#!/bin/bash

#brief:to solve match correct event node when EAVCapture starts.
#date:September 17,2015.
#author:zhangshaoyan,shell.albert@gmail.com

#qt's start command line parameters.
mouseplug=
kbdplug=
allplug="-platform linuxfb"

#scan /dev/input directory to get valid event that supports EV_REL.
./evtest.bin 0 > mouse_event.log
mouse_event_cnt=$?

#scan /dev/input diretory to get valid event that supports EV_KEY.
./evtest.bin 1 > kbd_event.log
kbd_event_cnt=$?

#generate the final one-line start parameter.
if [ $mouse_event_cnt -gt 0 ];then
   while read line
   do
       mouseplug="$mouseplug -plugin evdevmouse:$line"
   done < mouse_event.log
fi

if [ $kbd_event_cnt -gt 0 ];then
   while read line
   do
       kbdplug="$kbdplug -plugin evdevkeyboard:$line"
   done < kbd_event.log
fi

allplug="$allplug $mouseplug $kbdplug"
echo $allplug