Interactive interpreter in embedded application

I have a C++ program that uses SWI-Prolog as a logic server via PlEngine. Now
I'm wondering if it is possible to write a function, which behaves like the
interactive interpreter command line. 

This function would receive a string (command line input) and return a
string (command line output as a response to input). 
*int PlCall(const char *goal)* seems to do the trick (input-wise), but I
need something for the output. 

This way it would be possible to have the interpreter in a GUI program (e.g.
as a dock widget). Would be great for debugging and manipulation of an
otherwise integrated Prolog system. 



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