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From: anon@att.net
Newsgroups: comp.lang.ada
Subject: Re: system call
Date: Mon, 15 Aug 2011 19:37:52 +0000 (UTC)
Organization: Aioe.org NNTP Server
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References: <4e46c5c3$0$32648$426a74cc@news.free.fr>
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Date: 2011-08-15T19:37:52+00:00
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try something like this 

with GNAT.OS_Lib;          
use GNAT.OS_Lib;

  Prog_File : String_Access ;
  Arg_File : String_Access ;

  Args    : GNAT.OS_Lib.Argument_List ( 1 .. 1 );

  Success : Boolean ;

begin
  Arg_File := new String ( "<data file name>" ) ; 
  Args ( 1 ) := Arg_File ;
  Prog_Path := new String ( "<program name>" ) ; 

  GNAT.OS_Lib.Spawn (Prog_Path.all, Args, Success);

   if not Success then
     Exit_Program (E_Fatal);
   end if;
end ;



In <4e494de0$0$20025$426a34cc@news.free.fr>, "philippe.torgue@free.fr" <philippe.torgue@free.fr> writes:
>Adam Beneschan wrote:
>
>> On Aug 15, 8:40�am, Adam Beneschan <a...@irvine.com> wrote:
>>> On Aug 13, 11:43�am, "philippe.tor...@free.fr"
>>>
>>>
>>>
>>>
>>>
>>> <philippe.tor...@free.fr> wrote:
>>> > Hello,
>>>
>>> > I have a program, the time of his execution, constructed images, in fact
>>> > files in PPM (P3, plain text mode)
>>> > In short, the program does not deal with the viewing of these images
>>> > (failing to find a library to do ...)
>>>
>>> > So I want to entrust this task to an external application (imview,
>>> > xview, qiv ... etc):
>>>
>>> > res = system ("imview out.ppm");
>>>
>>> > But each time this code is a new process
>>> > image viewer (here imview) that arises.
>>>
>>> > My application is waiting while I close imview to move to
>>> > the next iteration.
>>>
>>> > Well, now you have guessed the question for each passage on the line above,
>>> > I would like the external program (imview, qiv, xview ... whatever), load a new image
>>>
>>> > Regards!
>>>
>>> I'm not real clear on what you're trying to do. �But it sounds like
>>> you want to run imview or some other program once, and have your
>>> program tell that program to display a new image whenever it wants to
>>> display something new. �In order for that to work, the image displayer
>>> has to be set up to accept that kind of communication.
>>>
>>> However, if by "imview" you mean the program documented athttp://hugues.zahlt.info/software_imview.html, that program appears to
>>> have a server mode. �So you'll need to run it in server mode and then
>>> communicate with it via a TCP/IP socket. �The documentation should
>>> explain how to do this, but I haven't looked over it carefully.
>>
>> Oh, yeah, one other thing: if you do this, you won't be able to use
>> system("...") to run imview, because "system" will wait for imview to
>> finish, which will never happen.  You'll need to find a way to spawn
>> imview without having your application wait for it to finish.  There
>> are ways to do this on both Unix/Linux and Windows (you don't say what
>> OS you're using); I think there are probably GNAT library operations
>> to perform that kind of spawning, but someone who's more knowledgeable
>> about GNAT than I am will need to help you with those, if you're using
>> GNAT.  There's no Ada language-defined operations for this.
>>
>>                                 -- Adam
>
>My O.S. is ubuntu.
>
>Damn! Here's what I read in the documentation imview ( server part)
>
>"Instead of having a new instance of imview pop up each time one wants
>to view an image, they can all appear in one, or a small number of
>imview windows. This is great for monitoring progress on a long
>processing run, for doing demos, for debugging an image analysis
>procedure, etc.
>"
>
>Your idea sounds very good!
>
>
>