Re: [Pnet-developers] Bad Substitution Error

[Glenn Chambers]

On Wednesday, May 18, 2005, at 03:16 PM, address@hidden wrote:

> Thanks Glenn,
>
> I got it working!  But I have another question (I'm not sure if I can 
> just
> ask it or if I should send another e-mail...but I'm going to ask it
> anyways...)  When I try to run the sample programs in pnetlib/samples 
> I'm
> getting the following error...
>
> Uncaught exception: Xsharp.XCannotConnectException: Cannot open display
>         at Xsharp.Display.OpenInternal(String, Application, Boolean) in
> ./Display.cs:223
>         at Xsharp.Display.Open(String, Application, Boolean) in
> ./Display.cs:253
>         at Xsharp.Application..ctor(String, String[]) in
> ./Application.cs:257
>         at XHello.Main(String[]) in ./XHello.cs:29
>
> I don't have something set up right, and I'm not sure what it is.  (If 
> this
> is a very trivial thing and a rather dumb question I'll apologize in
> advance.)  I've configured/make/make install pnetlib with no errors.
>
> Thanks for all your help so far!
> Theresa

This looks like an X-windows problem.  Is your DISPLAY variable set 
properly?
(You have to be running an X server to run the XHello program, which 
may not
be immediately obvious.)  If you're running the examples as a different
user than is running the X server, you'll have to do an 'xhost' command 
to
open up access to the server.  I'm on my MacOS box at the moment, so I 
don't
have the commands handy.  "xhost +" opens it up to *everyone*, so if 
you're
in a trusted environment, that should work.

A quick way to confirm that X is set up right is to type 'xterm' in the 
command
window you're trying to run the samples in.  If it opens up a terminal 
window,
you've got it right.  If it errors out, that may give you a better lead.

I'm cc'ing the list to put this into the public archives so people 
googling
for similar issues can see the advice and your results.


Glenn Chambers
Toledo, OH