LPEDGE undeclared identifier

I am trying to get edges of a face using the API -IGetEdges(edgeList). But edgeList is the type of LPEDGE*. When Idefined edgeList as LPEDGE*, the compiling errors shows that "errorC2065:'LPEDGE': undeclared identifier". Can anyone help me to getthe edgeList (pointer to an array of edges).

Many thanks
FengSolidworksApi macros