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One way to solve this problem is to use the A3DTopoEdgeGetOrCompute3DCurve helper function provided by HOOPS Exchange. This function obtains the 3D curve from the edge if it exists , and computes a new 3D curve if it does not. One consideration to make before using this function is that it requires a pointer to the A3DTopoBrepData that contains the edge.
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The HOOPS Exchange data model can represent edge geometry in different ways depending on the input file format. Using the method described above, you can determine and reliably obtain a 3D curve for parametric evaluation.