need a help regarding following matter.

this is the function that I'm going to call using dynamicCall();->getContourLine(double x1, double y1, double x2, double y2, VARIANT* strPTs)

ui.axWidget->dynamicCall("getContourLine(double x1, double y1, double x2, double y2, VARIANT* strPTs)",202916,362432,200191,366623,"5th parameter here");

But I cant get value which return from VARIANT* strPTs since unable to define 5th parameter correctly . if anyone Can give a solution, more than appreciated!! Thank u very much!