On 04/07/2011 08:14, fred f wrote:
> Hi all,
>
> How can I execute an external program, but to let my code continue.
>
> This doesn't work as I want and waits for finishing called app:
>
> ExecuteProcess (MyPathToExe, ' &');
>
That would only work if you do
ExecuteProcess('/bin/bash -c /my/path/to/exe &'); // (probably...?)
:) the & is shell/command line interpreter command only.
On the more serious note:
I think you need to use fork
http://www.freepascal.org/docs-html/rtl/oldlinux/fork.html
and then one of the exec* procedures
http://www.freepascal.org/docs-html/rtl/index-8.html#SECTIONE
(search for exec on this page, there is 6 of them related to linux
- Execl, Execle,Execlp,Execv,Execve,Execvp - that _do_not_return_ when
called! that's
why you need to use Fork())
(Pseudopascalcode)
PID := Fork();
case PID of // parent process goes on bypassing the below block
0: begin
Execl(MyPathToExe); /// forked child will not return, WILL NOT RETURN!
on success
// so in case the exec* fails, the forked child
needs to exit
// gracefully.
exit; //
end;
else
// here PID is either of the parent - check with GetPPid as Fork() man page
says
//
// or -1 if there were errors
end;
(Somebody, correct me if I'm wrong)
HTH,
L.
> Thanks.
>
> Bye, Fred
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