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From: Allamarein on 22 Jul 2010 12:53
It is a difficult question to frame, but I am going to try.

I have an executable file.
When you launch it asks the input file name .dat, that you have to
type in the prompt.
Then you must press Return key.
It runs and it provides an output file .out.
That's all.

I should integrate this code in fortran in this way.
A code, written by me, should write the input file (not problem).
Then it should call this file exe, automatically it has to key the
input file name and waits the output.

In short I have to integrate an executable, that needs a input from
keyboard (that is the input file name) in a fortran code.
I have to do that, because the executable must run a lot of times and
I don't want to lose my time to compile its input file manually each
time.
Obviously I don't have executable's source code and I cannot modify
it.

Is it possible to do?
From: steve on 22 Jul 2010 13:28
On Jul 22, 9:53 am, Allamarein <matteo.diplom...(a)gmail.com> wrote:
> It is a difficult question to frame, but I am going to try.
>
> I have an executable file.
> When you launch it asks the input file name .dat, that you have to
> type in the prompt.
> Then you must press Return key.
> It runs and it provides an output file .out.
> That's all.
>
> I should integrate this code in fortran in this way.
> A code, written by me, should write the input file (not problem).
> Then it should call this file exe, automatically it has to key the
> input file name and waits the output.
>
> In short I have to integrate an executable, that needs a input from
> keyboard (that is the input file name) in a fortran code.
> I have to do that, because the executable must run a lot of times and
> I don't want to lose my time to compile its input file manually each
> time.
> Obviously I don't have executable's source code and I cannot modify
> it.
>
> Is it possible to do?

Of course, but portability may be an issue.

(Of course)**2, you forgot to tell us which OS and
compiler you intend to use.

laptop:kargl[213] gfc4x -o cxz cxz.f90
laptop:kargl[214] gfc4x -o zxc zxc.f90
laptop:kargl[215] ./cxz
Input file name: Testing
laptop:kargl[216] cat Testing
Hope this helps
laptop:kargl[217] cat cxz.f90
program cxz
call system("./zxc")
end program cxz
laptop:kargl[218] cat zxc.f90
program zxc
character(len=80) name
write(*,'(a)', advance='no') 'Input file name: '
read(*,*) name
open(10, file=name)
write(10,'(a)') 'Hope this helps'
close(10)
end program zxc

From: Louis Krupp on 22 Jul 2010 13:39
On 7/22/2010 10:53 AM, Allamarein wrote:
> It is a difficult question to frame, but I am going to try.
>
> I have an executable file.
> When you launch it asks the input file name .dat, that you have to
> type in the prompt.
> Then you must press Return key.
> It runs and it provides an output file .out.
> That's all.
>
> I should integrate this code in fortran in this way.
> A code, written by me, should write the input file (not problem).
> Then it should call this file exe, automatically it has to key the
> input file name and waits the output.
>
> In short I have to integrate an executable, that needs a input from
> keyboard (that is the input file name) in a fortran code.
> I have to do that, because the executable must run a lot of times and
> I don't want to lose my time to compile its input file manually each
> time.
> Obviously I don't have executable's source code and I cannot modify
> it.
>
> Is it possible to do?

It sounds like the executable (call it "opp," for "other person's
program") reads the file name from standard input. If you're on UNIX or
Linux, you could write the name of the file to another file, say
"opp_filename," and then run opp as Steve suggested while redirecting
standard input:

....
.... write input file name to opp_filename
....
call system("opp < opp_filename")

Louis

From: glen herrmannsfeldt on 22 Jul 2010 13:52
Allamarein <matteo.diplomacy(a)gmail.com> wrote:
> It is a difficult question to frame, but I am going to try.

> I have an executable file.
> When you launch it asks the input file name .dat, that you have to
> type in the prompt.
> Then you must press Return key.
> It runs and it provides an output file .out.
> That's all.

> I should integrate this code in fortran in this way.
> A code, written by me, should write the input file (not problem).
> Then it should call this file exe, automatically it has to key the
> input file name and waits the output.

First, it depends on how the program reads in the file name.
If it read from standard input, then it is relatively easy.

If, running on a windowing system, it opens a window and
expects you to type into the window, it is somewhat harder.

It could also open the terminal device, such as /dev/tty, and
read it directly. That is also harder.

> In short I have to integrate an executable, that needs a input from
> keyboard (that is the input file name) in a fortran code.
> I have to do that, because the executable must run a lot of times and
> I don't want to lose my time to compile its input file manually each
> time.

In Unix/C this is done with popen(), which runs a program
such that you write into a pipe that the program then reads.
I believe that can't be done officially through C interoperability
but it might work anyway.

Otherwise, the more usual way would be to write the input
to a file and redirect stdin to that file. Write to a file,
such as temporary.input, then

call system("./prog.exe < temporary.input")

I thought that there was a standard Fortran 2003 way to execute
commands, such as the popular system() function or subroutine,
but I don't see it.

> Obviously I don't have executable's source code and I cannot
> modify it.

There are cases where you have to modify the executable to
get what you want done. If, for example, it opens "/dev/tty"
you can usually modify it to open, for example, "/tmp/xyz"
then write the desired input to that file.

Once we had a program supplied by HP that, on startup,
opened "/dev/console". That made it difficult to use the
system console, so I modified the executable (no source)
to open something else instead, called HP, and told them
what I had done. They seemed to think that was a perfectly
fine solution, and couldn't suggest anything else (such as
actually fixing the program).

> Is it possible to do?

-- glen
From: Allamarein on 22 Jul 2010 14:10
On 22 Lug, 19:39, Louis Krupp <lkrupp_nos...(a)indra.com.invalid> wrote:
> On 7/22/2010 10:53 AM, Allamarein wrote:
>
>
>
>
>
> > It is a difficult question to frame, but I am going to try.
>
> > I have an executable file.
> > When you launch it asks the input file name .dat, that you have to
> > type in the prompt.
> > Then you must press Return key.
> > It runs and it provides an output file .out.
> > That's all.
>
> > I should integrate this code in fortran in this way.
> > A code, written by me, should write the input file (not problem).
> > Then it should call this file exe, automatically it has to key the
> > input file name and waits the output.
>
> > In short I have to integrate an executable, that needs a input from
> > keyboard (that is the input file name) in a fortran code.
> > I have to do that, because the executable must run a lot of times and
> > I don't want to lose my time to compile its input file manually each
> > time.
> > Obviously I don't have executable's source code and I cannot modify
> > it.
>
> > Is it possible to do?
>
> It sounds like the executable (call it "opp," for "other person's
> program") reads the file name from standard input.  If you're on UNIX or
> Linux, you could write the name of the file to another file, say
> "opp_filename," and then run opp as Steve suggested while redirecting
> standard input:
>
> ...
> ... write input file name to opp_filename
> ...
> call system("opp < opp_filename")
>
> Louis

My code will be write by CVF 6.6 and it runs on Windows XP.
Let's suppose my executable is called 'opp.exe' and its input file
'data.dat'
Now when I launch opp.exe it waits, I type "data.dat" and I push
return key.

I am able to compile data.dat, but I would call opp.exe and
automatically it should find data.dat, without any commands from
keyboard.
Would you suggest how to write my code?
call system ("opp < data.dat") ? Is it right?
Also under XP it should works?
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