Zenity progress bar

mard0 · 04-14-2011, 03:32 AM

Hi i am busy writing this script to get a pixel count of a large batch of images in a directory for a research project. To do this i'm using a loop to get all the images in the directory. To make the whole procedure more user friendly for some colleagues i decided to use zenity, something i haven't yet really worked with.

As not to make sure that the users dont have to watch to this blank screen during the actual processing of the images i'm trying to get the zenity progress bar working. So far the progress bar comes up but instead of changing over time it stays "empty" till all the images are processed and then becomes 100% when all images are done. What servers my needs for now, but since im trying to learn more about zenity i was wondering how i could change the script to get the progress bar propery working? Below is the piece of script im talking about.

Code:

cd $input #goto path of image directory
(for a in *jpg *JPG *jpeg *JPEG; do 
  if [ -f "$a" ]; then #was it a image file
    b="$a" #set b to $a
    convert -resize 1000x1000\! ${b} -depth 1 -format %c histogram:info:$b.txt #get pixelcount and write to .txt file
  fi
done) | zenity --progress

Thanks, Mardo

MTK358 · 04-14-2011, 08:22 AM

Where are you piping the percentage into Zenity?

How do you think it will know when the loop loops and how many times it will loop?

Here's an example:

Code:

i=0
(while [ $((i <= 100)) '=' 1 ]
do
    echo $i
    sleep 1
    i=$((i + 5))
done) | zenity --progress --auto-close

Basically, whenever you want to change the value of the slider, pipe the percentage value plus a newline into Zenity's stdin.

EDIT: unrelated note: You should use "*.jpg" instead of "*jpg". What if you have a file with no extension that happens to end in "jpg"?

thund3rstruck · 04-14-2011, 04:25 PM

You should be able to get the percentage to increment just by setting the initial percentage value to 0. Below is a sample from a bulk file renaming script I use on a daily basis. You can also leave out the --percentage attribute and use --pulsate if you just want an ongoing indicator to pulse back and forth until the entire process is complete.

Code:

(for file in *.$mask
do
    # Code that processes files
    ...
done)|
        zenity --progress --auto-close --title="Renaming Files"  \
               --text="Processing files ..."  --percentage=0

jayboe · 09-22-2012, 02:19 PM

Quote:

Originally Posted by MTK358

Where are you piping the percentage into Zenity?

How do you think it will know when the loop loops and how many times it will loop?

Here's an example:

Code:

i=0
(while [ $((i <= 100)) '=' 1 ]
do
    echo $i
    sleep 1
    i=$((i + 5))
done) | zenity --progress --auto-close

Basically, whenever you want to change the value of the slider, pipe the percentage value plus a newline into Zenity's stdin.

EDIT: unrelated note: You should use "*.jpg" instead of "*jpg". What if you have a file with no extension that happens to end in "jpg"?

I was using the shred command on some larger files and the progress prompt was long gone before it finished. Maybe need to implement a file size solution. Thanks anyway, it gives a noob like me something to play with.