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Accepted
yinon
Asked: 2012-08-18 06:48:10 +0800 CST

capture login screen-not sucssecful

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I'm using Ubuntu 12.04 . If more information is needed, please tell me. I Tried some guides to cature my login screen:

How can I take a screenshot of the login screen?

http://www.howtoforge.com/how-to-take-a-screenshot-of-your-login-screen

I tried the first one, but after running:

$ sudo bash /tmp/shot.sh >/tmp/shot.xwd

I'm getting this:

No protocol specified
No protocol specified    
xwd unable to open display ':0'

and i'm getting an xwd file in my tmp folder. running the other commands giving errors.

tried the second one, after running:

chvt 8; sleep 5; XAUTHORITY=/var/gdm/:0.Xauth DISPLAY=:0.0 import -window root /tmp/gdm-login-shot.png

I got:

No protocol specified
No protocol specified
import: unable to open X server ':0.0' @ error/import.c/ImportImageCommand/366

Many Thanks for helping (:

EDIT to vine_user: here the output from the terminal-I cacked it from within the system while I'm looged in:

ubuntu@PrecisePangolin:~$ echo 'sleep 5; DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/$DISPLAYDISPLAY xwd -root' > /tmp/shot.sh
ubuntu@PrecisePangolin:~$ sudo bash /tmp/shot.sh >/tmp/shot.xwd
bash: /tmp/shot.xwd: Permission denied
ubuntu@PrecisePangolin:~$ sudo su
root@PrecisePangolin:/home/ubuntu#  sudo bash /tmp/shot.sh >/tmp/shot.xwd
No protocol specified
No protocol specified
xwd:  unable to open display ':0'
root@PrecisePangolin:/home/ubuntu#

EDIT 2!: HERE IT IS!: enter image description here

just uploading-this uploadong site is better than other iuset to use (: : enter image description here

12.04

4 Answers

  1. Best Answer

    Step1:

    Make /tmp/shot.sh using this command:

    echo 'sleep 20; DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/$DISPLAY xwd -root' > /tmp/shot.sh

    You may change the seconds of sleep suitably.

    Step2:

    Login to the text mode by pressing Ctrl+Alt+F1.

    Step3:

    Execute this command;

     sudo bash /tmp/shot.sh >/tmp/shot.xwd

    Step4:

    Return to the GUI mode by pressing Ctrl+Alt+F7.

    Step5:

    Logout by normal way. While you can see login screen, wait for some seconds.

    Step6:

    Login by normal way. And execute this command in terminal;

    convert /tmp/shot.xwd /tmp/shot.png

    (you need to install imagemagick, if you don't have installed it yet)

    So, you can check the picture using this command;

    eog /tmp/shot.png

    Reference: http://ptspts.blogspot.jp/2010/02/how-to-create-screen-shot-of-gdm-login.html

    In 12.04, it differs in using lightdm.

    • 4

  2. The answer by vine_user gave me a Black image so I modified it as below and got it correctly

    1. Make /tmp/shot.sh with the command echo 'chvt 7; sleep 10; DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/$DISPLAY xwd -root' > /tmp/shot.sh

    2. Logout and login to text mode (Ctrl+Alt+F1)

    3. Execute sudo bash /tmp/shot.sh >/tmp/shot.xwd

    4. Return to GUI mode by pressing Ctrl+Alt+F7 (sometimes it is Ctrl+Alt+F8 - if it is your case then modify the fisrt command by replacing chvt 7 with chvt 8

    5. Use the command convert /tmp/shot.xwd ~/Desktop/shot.png to convert the /tmp/shot.xwd to ~/Desktop/shot.png (imagemagick is required)

    Here is the screenshot of my login screen enter image description here

    • 3

  3. Try running the following command...

    unity-greeter --test-mode

    ... and taking a screenshot of that.

    • 0

  4. I have Written a small script to make it simple. I am sharing it here.

    Install Step 1: Save this code into your home directory a file named loginsceenshot.sh

    ## Save this file in your home folder loginscreenshot.sh 
## make the file Executable 
## Hit Ctrl+Alt+F1 
## login and run program using
## sudo ./loginscreenshot.sh
echo "Waiting  .... "
echo "Now Go to Ctrl+Alt+F7"
sleep 15
echo 'Click ...  '
DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/$DISPLAY xwd -root > tmp.xwd
convert tmp.xwd ScreenShot.png
rm tmp.xwd
echo "ScreenShot is Taken, Please check your home directory and open 'ScreenShot.png'"

    Install Step 2 Hit Ctrl + Alt + F1, login, and type this. 

    chmod +x ./loginsceenshot.sh
sudo apt-get install imagemagick

    Use Step 1 Hit Ctrl + Alt + F1, login, and type this. 

    sudo ./loginsceenshot.sh

    Use Step 2 Hit Ctrl + Alt + F7, goto Login page and wait for 15 sec.

    Use Step 3 Open you home directory and look of ScreenShot.png

    Myhomescreen

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