how to get zenity code if user close zenity window

pedropt · 03-02-2017, 09:45 AM

hi everyone , i have an issue understanding in how will i get an exit code for zenity .

zenity replies :
0 = ok , yes
1 = false,cancel
5 = timeout

but i need the zenity code if user just closed zenity window and did not pressed any button .

a piece of code to make logic :

default age value is 20 .

-If user write any value in input box , then echo will write that value on age.tmp file .

-If user press OK without writing any input value , then echo will write default "20" on age.tmp file .

-If user press Cancel then echo will not write default "20" on age.tmp file .

But if user just close zenity window then nothing will be written on age.tmp file .

Quote:

#!/bin/bash
rm -f age.tmp
ask=$(zenity --entry --title="age" --width=100 --height=100 --text="write your age" --entry-text="20");
if [ $? = "5" ]; then
echo "20" > age.tmp
fi
if [ $? = "0" ]; then
echo "$ask" > age.tmp
fi
if [ $? = "1" ]; then
echo "20" > age.tmp
fi
cat age.tmp

What i need is to get zenity exit code if user just close the window and ignored the buttons .

Note : according to zenity manual , 1 means "cancel , no , or close window"

https://help.gnome.org/users/zenity/.../usage.html.en
Could this be a bug ?

rknichols · 03-02-2017, 11:39 AM

Your return code is being destroyed by the first "if" construct. From the bash manpage:

if list; then list; [ elif list; then list; ] ... [ else list; ] fi
The if list is executed. If its exit status is zero, the then list is executed. Otherwise, each elif list is executed in turn, and if its exit status is zero, the corresponding then list is executed and the command completes. Otherwise, the else list is executed, if present. The exit status is the exit status of the last command executed, or zero if no condition tested true.

You have to save the return code if you want to test it more than once:

Code:

ask=$(zenity --entry --title="age" --width=100 --height=100 --text="write your age" --entry-text="20")
Rc=$?
if [ $Rc = "5" ]; then
    echo "20" > age.tmp
fi
if [ $Rc = "0" ]; then
    echo "$ask" > age.tmp
fi
if [ $Rc = "1" ]; then
    echo "20" > age.tmp
fi

Habitual · 03-02-2017, 11:51 AM

Sorry. Caffeine shortage.

pedropt · 03-02-2017, 12:03 PM

nice one , thanks for the help .

Ramurd · 03-03-2017, 12:13 PM

In all cases I would save the resultcode; Either from the PIPESTATUS array or from $?

The bunch of if statements could be replaced by a switch:

Code:

ask=$(zenity --entry --title="age" --width=100 --height=100 --text="write your age" --entry-text="20")
Rc=$?

case $Rc in
   "5") echo "20" > age.tmp ;;
   "0") echo "$ask" > age.tmp ;;
   "1") echo "20" > age.tmp ;;
esac

or use if then elif then fi construction like so:

Code:

ask=$(zenity --entry --title="age" --width=100 --height=100 --text="write your age" --entry-text="20")
Rc=$?

if [[ $Rc = "5" ]]
then
    echo "20" > age.tmp
elif [[ $Rc = "0" ]]
then
    echo "$ask" > age.tmp
elif [[ $Rc = "1" ]]
then
    echo "20" > age.tmp
fi

Both are more logical: you're testing against a fixed value towards the same variable that cannot have changed in between the comparisons; So, having tested one as true, the other cases do not have to be computed, since they cannot be true.

And always, have a care with special (volatile) variables; $? and PIPESTATUS change directly after each command.

For good measure, as I mentioned PIPESTATUS, here's an example:

Code:

somefunction | tee -a logfile.log
RETVAL=${PIPESTATUS[0]}

Pipestatus is (particulary) handy when you want to know the return value of one (or more) commands that have been executed in a pipe; It is an array, and if you want to keep all values, you have to store them all in an array:

Code:

true | false | echo done | grep nothing | true | false | true | false
RETVAL=${PIPESTATUS[*]}

echo ${RETVAL[*]}