fxruby users - Nov 2008 - capturing stdout, stdin and stderr

Hi, All.

Is there any tutorial out there on capturing the standard streams (in,
out, err) so that we can have an external command (say, scp) display
output in a window and get input from user with a dialog box?

Thanks,

-- 

angico
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afaik, something like that could be done via IO.popen ...
somebody correct me if i''m wrong.-- henon

On Wed, Nov 5, 2008 at 5:40 PM, angico <angico at angico.org> wrote:
> Hi, All.
>
> Is there any tutorial out there on capturing the standard streams (in,
> out, err) so that we can have an external command (say, scp) display
> output in a window and get input from user with a dialog box?
>
> Thanks,
>
> --
>
> angico
> ------
> home page: www.angico.org
> Gnu/Linux, FLOSS, Espiritismo, e eu por mim mesmo 8^I
> ------
> contatos:
> email: angico at angico.org
> skype: an.gi.co
> ------
>
> _______________________________________________
> fxruby-users mailing list
> fxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/fxruby-users
>
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Example from Programming Ruby book:

pig = IO.popen("/usr/local/bin/pig", "w+")
pig.puts "ice cream after they go to bed"
pig.close_write
puts pig.gets


On Wed, Nov 5, 2008 at 8:40 PM, angico <angico at angico.org> wrote:
> Hi, All.
>
> Is there any tutorial out there on capturing the standard streams (in,
> out, err) so that we can have an external command (say, scp) display
> output in a window and get input from user with a dialog box?
>
> Thanks,
>
> --
>
> angico
> ------
> home page: www.angico.org
> Gnu/Linux, FLOSS, Espiritismo, e eu por mim mesmo 8^I
> ------
> contatos:
> email: angico at angico.org
> skype: an.gi.co
> ------
>
> _______________________________________________
> fxruby-users mailing list
> fxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/fxruby-users
>
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Em Qui, 2008-11-06 ?s 09:16 +0400, Rovshan Baghirov
escreveu:
> Example from Programming Ruby book:
> 
> pig = IO.popen("/usr/local/bin/pig", "w+")
> pig.puts "ice cream after they go to bed"
> pig.close_write
> puts pig.gets
Thank you, guys. I guess it''s a starting point.

But what I really need is to have an application''s stdin
"connected" to
an FXInputDialog, in order to get user input, instead of the console.

Let''s say I want to create a front-end to scp. The user will enter the
name of the host and the full filename in a dialog. Then I pass in these
data to scp through, say, popen. Ok. Then, scp will need to ask the user
for their password. Instead of the console asking the user to enter that
password, I''d like to catch this (including the message
"angico at 192.168.1.3''s password: ") and present them to the
user in an
FXInputDialog. I''m not sure if I''m being clear.

Anyway, does anybody know how can I achieve this? Any idea? Any
tutorial?

Thanks, again,

-- 

angico
------
home page: www.angico.org
Gnu/Linux, FLOSS, Espiritismo, e eu por mim mesmo 8^I
------
contatos:
email: angico at angico.org
skype: an.gi.co
------

On Thursday 06 November 2008, angico wrote:
> Em Qui, 2008-11-06 ?s 09:16 +0400, Rovshan Baghirov escreveu:
> > Example from Programming Ruby book:
> > 
> > pig = IO.popen("/usr/local/bin/pig", "w+")
> > pig.puts "ice cream after they go to bed"
> > pig.close_write
> > puts pig.gets
> 
> Thank you, guys. I guess it''s a starting point.
> 
> But what I really need is to have an application''s stdin
"connected" to
> an FXInputDialog, in order to get user input, instead of the console.
> 
> Let''s say I want to create a front-end to scp. The user will enter
the
> name of the host and the full filename in a dialog. Then I pass in these
> data to scp through, say, popen. Ok. Then, scp will need to ask the user
> for their password. Instead of the console asking the user to enter that
> password, I''d like to catch this (including the message
> "angico at 192.168.1.3''s password: ") and present them
to the user in an
> FXInputDialog. I''m not sure if I''m being clear.
> 
> Anyway, does anybody know how can I achieve this? Any idea? Any
> tutorial?
> 
> Thanks, again,
> 
You can open two pipes and pass these along as stdin and stdout of the
program you''re starting:

	pipe(in);
	pipe(out);

	pid=fork();

	if(pid==0){
	  ::close(out[0]);
	  ::dup2(out[1],STDOUT_FILENO);
	  ::close(in[1]);
	  ::dup2(in[0],STDIN_FILENO);
	  ::execl(path,...,NULL);
	  ::exit(1);
	  }
        else if(pid>0){
          ::close(out[1]);
          ::close(in[0]);
         
getApp()->addInput(obj,ID_INPUTREAD,out[0],INPUT_READ,(void*)(FXival)out[0]);
	  }

In a nutshell.  There are details omitted for brevity''s sake.

The handler for ID_INPUT_READ will get invoked when the program "path"
writes to
stdout.  It will then have to present this text to the user and write to in[1]
to talk back to the program (using write()).

Hope this helps,

		- Jeroen





-- 
+----------------------------------------------------------------------------+
| Copyright (C) 07:00 11/ 6/2008 Jeroen van der Zijp.   All Rights Reserved. |
+----------------------------------------------------------------------------+

Em Qui, 2008-11-06 ?s 08:13 -0500, Jeroen van der Zijp escreveu:
> You can open two pipes and pass these along as stdin and stdout of the
> program you''re starting:
> 
> 	pipe(in);
> 	pipe(out);
> 
> 	pid=fork();
> 
> 	if(pid==0){
> 	  ::close(out[0]);
> 	  ::dup2(out[1],STDOUT_FILENO);
> 	  ::close(in[1]);
> 	  ::dup2(in[0],STDIN_FILENO);
> 	  ::execl(path,...,NULL);
> 	  ::exit(1);
> 	  }
>         else if(pid>0){
>           ::close(out[1]);
>           ::close(in[0]);
>          
getApp()->addInput(obj,ID_INPUTREAD,out[0],INPUT_READ,(void*)(FXival)out[0]);
> 	  }
> 
> In a nutshell.  There are details omitted for brevity''s sake.
> 
> The handler for ID_INPUT_READ will get invoked when the program
"path" writes to
> stdout.  It will then have to present this text to the user and write to
in[1]
> to talk back to the program (using write()).
> 
> Hope this helps,
> 
> 		- Jeroen
> 
Yeah! That''s exactly what I was looking for. Thank you very much!

-- 

angico
------
home page: www.angico.org
Gnu/Linux, FLOSS, Espiritismo, e eu por mim mesmo 8^I
------
contatos:
email: angico at angico.org
skype: an.gi.co
------