Re: Cannot display through rsh

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Tue, 12 Aug 2003, Ben Kim wrote:

> I am trying to call a script located on my Windows box
> from my Unix box through rsh.  All the script does is
> run a java GUI application that outputs some
> information in standard out.  When I run this script
> through rsh, the java process is up and running on
> Windows (I also see output, also check task manager)
> but the GUI frame does not show up.  On Windows, I
> installed cygwin and xfree.  I started X via
> xstartwin.  I also xhost + to allow any host to
> remotely display on Windows.  I know display isn't the
> problem because if I am on my Unix machine, if I set
> the display to Windows, and run the java app locally
> on Unix, the app correctly displays on Windows.  Only
> if the I'm trying to rsh the same script on Windows
> from Unix, this doesn't work.  Another interesting
> point is that if I were to change the script on
> Windows to run cygwin/xfree xterm instead of the java
> app,  and from Unix rsh the script, the xterm
> correctly displays.  But as soon as I put in the java
> app, it does not display.
>
> To summarize:
>   1.  From Unix, run java app on Unix, display to
> Windows (works)
>   2.  From Unix, rsh java app on Windows, display to
> Windows (does NOT work)
>   3.  From Unix, rsh cygwin xapps (xterm, xclock etc)
> on Windows, display to  Windows (works)
>
> Does anyone know what this might be the case?  And is
> there any way to get #2 to work?

Ben,

There is no Cygwin-aware Java JDK.  This basically means that, unlike the
Unix one, the JDK you're using on Windows is not using the X protocol to
display windows, but rather the Windows GDI one.  In other words, you
cannot do what you want without a VNC-like tool that would let you display
*any* Windows native application using X.
	Igor
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