Pipes and gnuplot on Windows

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C

Windows

Dear friends.
I have an issue with using gnuplot with redirected IO. I have developed a C software for simulations of electromagnetic fields propagation and I would like to use gnuplot as plotting engine.
I have done this quite successfully using CreatePipe and CreateProcess fucntions on Win32. But one thing I could not achieve: retrieving output from gnuplot.
My best guess is that it does buffered output do stdout and I cannot use ReadFile on the handle, since data printed to stdout wont be passed to the buffer directly, given that it is buffered.

My questions:
1. Is there a way that I use setvbuf to set the buffer mode of the stdout of another (child) process?
2. Is there any other way that I can achieve piped communication to stdout and stdin of a gnuplot process on Win32?

Thanks in advance!