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Hi
Could anyone tell me how to run gnuplot from my c program.
I am using gnuplot in X11 environment. I am trying to send
commands to the gnuplot from my c program. Please help.
Thanks
Sudip Das
elesudip@ukcc.uky.edu

Hi ELESUDIP,


> Could anyone tell me how to run gnuplot from my c program.
> I am using gnuplot in X11 environment. I am trying to send
> commands to the gnuplot from my c program. Please help.
> Thanks
> Sudip Das
> elesudip@ukcc.uky.edu


Try using a pipe:

#define BUFSIZ 256  /* enough space to hold any gnuplot command */
FILE *gp;

int gp_open (void)
{
    gp = popen("gnuplot","w");
    setvbuf(gp, NULL, _IOLBF, BUFSIZ);  /* switch pipe to
                                           line buffered mode */
    return (gp?0:-1);                   /* return -1 if no pipe */
}

int gp_close (void)
{
    return (pclose (gp));               /* returns exit status */
}                                       /* of gnuplot          */

int gnu_plot (const char *command)
{
    if (!gp) return (-1);

    fprintf (gp,command);
    return (0);
}

/* Now you can use gp_open() to create a pipe to gnuplot, gnu_plot()
   to send your commands to gnuplot and gp_close() to terminate
   gnuplot
*/

In article <177E5BD7CS86.ELESUDIP@ukcc.uky.edu> ELESUDIP@ukcc.uky.edu writes:

   Could anyone tell me how to run gnuplot from my c program.
   I am using gnuplot in X11 environment. I am trying to send
   commands to the gnuplot from my c program. Please help.

There are several possibilities. I simply piped the gnuplot commands:

FILE *gnupip;
gnupip=popen("gnuplot","w");
fprintf(gnupip, "se da st li\n");
fflush(gnupip);

...(here go the real plotting commands as fprintf-fflush combos)

pclose(gnupip);

I did this under HP-UX (X11) and OS/2 (PM), hope it helps.

Thomas.
-- 
=============================================================================
Thomas Hoffmann, Institut fuer Halbleiter- und Mikrosystemtechnik, TU Dresden 
E-mail: hoffmann@ehms1.et.tu-dresden.de

Rich Cook: "Programming today is a race between software engineers striving to
      build bigger and better idiot-proof programs, and the Universe trying to
      produce bigger and better idiots. So far, the Universe is winning."

In <u8ohk7969r.fsf@ehmgs2.et.tu-dresden.de>, hoffmann@ehmgs2.et.tu-dresden.de (Thomas Hoffmann) writes:
>In article <177E5BD7CS86.ELESUDIP@ukcc.uky.edu> ELESUDIP@ukcc.uky.edu writes:
>
>   Could anyone tell me how to run gnuplot from my c program.
>   I am using gnuplot in X11 environment. I am trying to send
>   commands to the gnuplot from my c program. Please help.
>
>There are several possibilities. I simply piped the gnuplot commands:
>
>FILE *gnupip;
>gnupip=popen("gnuplot","w");
>fprintf(gnupip, "se da st li\n");
>fflush(gnupip);
>
>....(here go the real plotting commands as fprintf-fflush combos)
>
>pclose(gnupip);
>
>I did this under HP-UX (X11) and OS/2 (PM), hope it helps.
>
>Thomas.
>-- 
>=============================================================================
>Thomas Hoffmann, Institut fuer Halbleiter- und Mikrosystemtechnik, TU Dresden 
>E-mail: hoffmann@ehms1.et.tu-dresden.de
>
>Rich Cook: "Programming today is a race between software engineers striving to
>      build bigger and better idiot-proof programs, and the Universe trying to
>      produce bigger and better idiots. So far, the Universe is winning."

I was looking at the named pipe option for interfaceing to gnuplot, however,
their is no popen command within the Warp toolkit for working with named pipes.
You have to know the handle of the name pipe inorder to connect to it, Right!
Is their a way or is their a named pipe that is available to talk to gnuplot (3.6)?

BTW
I'm using VisualAge C++ version 3.0 compiler in Warp/Merlin.

   Thanks for any posts or email schipper@edlmail.jsc.nasa.gov

					John Schipper