[Gnuplot-info] graph shown only for a split second

[bittersweet <noo...@gm...>]

hi.

I have manage to plot the sin(x) graph but it only show itself for a less
than a second.
How do I get the graph to show longer or permanently until the 'x' button
(exit) is clicked?
Here is my codes:
         if ((pid > 0) && (cfile > 0))
	{
		printf("Open file suceeded!\n");
		system("wgnuplot.exe command.txt");
		_pclose(pid);
	}
where cfile is the pointer to command.txt, which is my commands
and pid is the pointer to wgnuplot
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