Re: system call

["philippe.torgue@free.fr" <philippe.torgue@free.fr>]

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!