dynamic generate command line parameters for qt embedded application

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