Unable to open X server `' (Magick::ImageMagickError)

I have written a Ruby script “dicom_info.rb”, and when I try running
it, I get the following error. Why is that? And, how can it get
solved?

C:\Users\Abder-Rahman\Desktop\Research\dicom>ruby dicom_info.rb
Fantomas is 070Y
And, this is the DICOM image
dicom_info.rb:22:in display': unable to open X server’ (Magick::ImageMagickEr
ror)
from dicom_info.rb:22
from dicom_info.rb:10:in `each_index’
from dicom_info.rb:10

This is the “dicom_info,rb” script:

require “rubygems”
require “dicom”
require “RMagick”

dicom_files = Array.new
Dir["./dcm_files/*.dcm"].each do |dcm|
dicom_files << dcm
end

dicom_files.each_index do |i|
dcm = DICOM::DObject.new(dicom_files[i])

Retrieve patient name value

patient_name = dcm.value(“0010,0010”)
patient_age = dcm.value(“0010,1010”)
print patient_name
print " "
print "is "
print patient_age
puts
puts “And, this is the DICOM image”
dicom_image = dcm.get_image_magick
dicom_image.display
end

Thanks.

On Mon, Sep 06, 2010 at 12:42:11PM +0900, Abder-Rahman A. wrote:

I have written a Ruby script “dicom_info.rb”, and when I try running
it, I get the following error. Why is that? And, how can it get
solved?

C:\Users\Abder-Rahman\Desktop\Research\dicom>ruby dicom_info.rb

So I’m guessing you’re running some version of ruby under some version
of
windows.

dicom_info.rb:22:in `display’: unable to open X server

Well, do you have an X server? For example, are you running under
cygwin?

It would be much more helpful if you could give the full context of
where
you’re running this.

  • What O/S and version you’re running under
  • What ruby version you’re running under, and where you got it from or
    how you installed it (e.g. one-click installer, which version?)
  • What versions of relevant library/ies

Thanks a lot Brian.

This is more information on my environment:

OS —> Windows Vista Home Edition
Ruby version —> ruby 1.8.7 (2010-08-16 patchlevel 302) [i386-mingw32]

I installed this version of Ruby using RubyInstaller for Windows
http://www.rubyinstaller.org/

I just didn’t understand those questions:

  • Well, do you have an X server? For example, are you running under
    cygwin?

  • What versions of relevant library/ies

So, do you suggest installing “cygwin”?

you suggest installing “cygwin”?

You won’t be able to run this line:

“dicom_image.display”

without X installed. It’ll be an uphill battle, either way, in windows.

On Mon, Sep 06, 2010 at 11:55:32PM +0900, Abder-Rahman A. wrote:

I installed this version of Ruby using RubyInstaller for Windows
http://www.rubyinstaller.org/

I just didn’t understand those questions:

  • Well, do you have an X server? For example, are you running under
    cygwin?

An X server is the way that a Unix system talks to a graphical display.
If
you’ve got code which expects to talk to an X server, then it’ll fail if
you
don’t have one.

I’m pretty sure you get one with cygwin; I’d be surprised if the
RubyInstaller comes with one. However I’m not a Windows user, I just
occasionally look over people’s shoulders :slight_smile:

I have downloaded Cygwin, but still getting the following error:

C:\Users\Abder-Rahman\Desktop\Research\dicom>ruby dicom_info.rb
Fantomas is 070Y
And, this is the DICOM image
dicom_info.rb:22:in display': unable to open X server’ @
display.c/DisplayIma
ges/1654 (Magick::ImageMagickError)
from dicom_info.rb:22
from dicom_info.rb:10:in `each_index’
from dicom_info.rb:10

Why is that? Is there a workaround for this?

Abder-Rahman A. wrote:

I have downloaded Cygwin, but still getting the following error:

C:\Users\Abder-Rahman\Desktop\Research\dicom>ruby dicom_info.rb
Fantomas is 070Y
And, this is the DICOM image
dicom_info.rb:22:in display': unable to open X server’ @
display.c/DisplayIma
ges/1654 (Magick::ImageMagickError)
from dicom_info.rb:22
from dicom_info.rb:10:in `each_index’
from dicom_info.rb:10

Why is that? Is there a workaround for this?

are you using cygwin ruby? do you have cygwin X package installed?

Roger P. wrote:

you suggest installing “cygwin”?

You won’t be able to run this line:

“dicom_image.display”

without X installed. It’ll be an uphill battle, either way, in windows.

Got what you mean @Roger, so I’ll go with installing Cygwin.

Thanks.

Roger P. wrote:

are you using cygwin ruby? do you have cygwin X package installed?

And have you started a cygwin shell and typed “startx” ?

Thanks for your replies.

@Roger, is there “Cygwin Ruby”? Is it different from “Cygwin”?

@Brian, no really I didn’t do that, just new to this. So, “startx” has
to be run then if I need to use X Window? Got what you mean.

Hi Ali,

On 07.09.2010 12:30, Abder-Rahman A. wrote:

I have started started a Cygwin shell and typed “startx”, but got the
following:

bash: startx: command not found

First Google result searching for “cygwin startx”:
http://x.cygwin.com/docs/ug/using.html

Looks useful to me, mention you need to install the xinit package (and
probably others … ), etc.

HTH

Brian C. wrote:

Roger P. wrote:

are you using cygwin ruby? do you have cygwin X package installed?

And have you started a cygwin shell and typed “startx” ?

I have started started a Cygwin shell and typed “startx”, but got the
following:

bash: startx: command not found

Any ideas?

Thanks.

@Markus. Thanks for your reply.

I have installed “xinit”.

Now, when I want to run “startx”, I get the following:

[email protected] ~
$ startx
xauth: creating new authority file /home/Abder-Rahman/.serverauth.1188
xinit: Resource temporarily unavailable (errno 11): Another X server
instance is running on DISPLAY :0

Why is that?

Thanks.

Hi Ali,

On 08.09.2010 08:06, Abder-Rahman A. wrote:

Why is that?
The error message indicated that “another X server instance is running”,
have you checked that?

Accidentally I installed cygwin with X today and it worked out of the
box (W7 Pro x64).

HTH

Markus F. wrote:

Hi Ali,

On 08.09.2010 08:06, Abder-Rahman A. wrote:

Why is that?
The error message indicated that “another X server instance is running”,
have you checked that?

Accidentally I installed cygwin with X today and it worked out of the
box (W7 Pro x64).

HTH

Yes, I checked that and didn’t notice any other instance running.

Maybe I’m missing something.

I’m trying to do CTRL-ALT-DELETE at Windows Vista to check what programs
are running but seems there to be a problem.

Thanks.

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