gnuplot doesn't plot from pipe

[Freude]

Hello everyone,

I am trying to call gnuplot in c++ code using pipe in linux. There is no errors during compilation, building and excecution. However, window with the plot does not appear. Below is the code.

FILE* Gplt = popen("gnuplot -persist","w");
	fprintf(Gplt,"plot '/home/mk/nh1.dat' using 100 with lines");	
	pclose(Gplt);

What is the possible reason of such behaviour?

[L7Sqr]

What is the possible reason of such behaviour?

gnuplot is line buffered and you do not send a newline to the application. Try:

fprintf( Gplt, "plot '/home/mk/nh1.dat' using 100 with lines\n");

You may need to fflush (Gplt); to ensure that the buffer is written to the application depending on your context.

[Freude]

Thanks, that's work fine