I am trying to open a gnuplot through command line using c++ and compile a graph

Question

My code is

int gnuplot() {

    FILE *gnu;
    gnu = _popen(" gnuplot ", "r");

    fprintf(gnu, "plot \'C:/Users/user/Documents/gnuplot/cpp/FFT/file.dat\' with linespoints \n ");

    fflush(gnu); // I'm not sure how or if this will help, I thought it was related

    _pclose(gnu);

     return 0;
}

At the moment I am able to just open the CMD window of the gunplot window but not enter the plot command or exit it.

Just to let you know. There is a gnuplot C++ interface available here — orbitcowboy
– orbitcowboy, Commented May 2, 2016 at 20:23

timrau · Accepted Answer · 2015-09-22 10:27:14Z

5

gnu = _popen(" gnuplot ", "r");

It should be write mode instead.

gnu = _popen("gnuplot ", "w");

answered Sep 22, 2015 at 10:27

timrau

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4 Comments

mega_creamery Over a year ago

Sorry I whould have added that I tried that already. If I change "r" to "w" it opens it and closes it quickly, barely noticeble. same if I remove the line _pclose(gnu);. how can I make it close the cmd but keep the gnuplot window open?

timrau Over a year ago

One approach: plot to image file, so you don't need to keep the gnuplot window open

timrau Over a year ago

Another approach: Use system("gnuplot -e \"plot \'C:/Users/user/Documents/gnuplot/cpp/FFT/file.dat\' with linespoints\""); instead of popen.

mega_creamery Over a year ago

This is my code now, it yields me gnuplot is not recognized and no files created. FILE *gnuopener; gnuopener = _popen(" gnuplot ", "w"); fprintf(gnuopener, "plot \'C:/Users/yes/Documents/gnuplot/cpp/FFT/jesus.dat\' with linespoints\n"); fprintf(gnuopener, "set term postscript\n"); fprintf(gnuopener, "set output \"jesus.ps\" \n"); fprintf(gnuopener, "replot\n"); fprintf(gnuopener, "set term png\n"); fprintf(gnuopener, "set output \"jesus.png\" \n"); fprintf(gnuopener, "replot\n"); fprintf(gnuopener, "set term win \n"); _pclose(gnuopener);

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