Windows, c++ - Gnuplot as child process, cannot get data from stdout -

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i want use gnuplot c++ program in windows. launch gnuplot (v5.0) child process c++, described here: https://msdn.microsoft.com/en-us/library/windows/desktop/ms682499(v=vs.85).aspx.

writing process stdin writefile works , can send commands gnuplot , plots ok; however, need read gnuplot's output back. when trying read stdout of process:

  • readfile blocks.
  • peeknamedpipe returns 0 bytes available read.

when launch executable, example "cmd.exe", instead of "gnuplot.exe", peeknamedpipe returns number of bytes available, , readfile reads data expected. me, means code ok , somehow, "gnuplot.exe" doesn't write stdout.

does know if possible read gnuplot's output this?

edit

the main goal able set terminal png , read image data without passing temporary file.


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