how to use the saveas4 function

Dear all

i am new to the solidworks API... currently i can draw a cylinder with the dll...and after the drawing i want to save the part as STL format... i looked into the API help file and found maybe saveas4 can be used. but some errors when compiling... cannot figure out where is the problems

void MenuItemCB(void) { LPMODELDOC pModelDoc;//define pModelDoc pointer TheApplication->GetSWApp()->get_IActiveDoc(&pModelDoc);//obtain pModelDoc pointer LPPARTDOC pPartDoc;// define pPartDoc pointer pModelDoc->QueryInterface(IID_IPartDoc,(LPVOID *)&pPartDoc);//obtain pPartDoc pointer

VARIANT_BOOL retval;//define retval pModelDoc->SelectByID(auT("Front"),auT("PLANE"),0,0,0,&retval);

pModelDoc->InsertSketch();//enter sketching drawing

double P1[3];// defind and evaluate p1 & p2 P1[0]=0; P1[1]=0; P1[2]=0; double P2[3]; P2[0]=0; P2[1]=0.1; P2[2]=0; pModelDoc->ICreateCenterLine ( P1, P2 );//draw the center line through P1, P2 pModelDoc->ClearSelection();//clear selection

LPSKETCHSEGMENT retval2;//define retval2 pModelDoc->ICreateLine2 ( 0, 0, 0, 0.03, 0, 0, &retval2 );//draw line pModelDoc->ICreateLine2 ( 0.03, 0, 0, 0.03, 0.09, 0, &retval2 );//draw line pModelDoc->ICreateLine2 ( 0.03, 0.09, 0, 0, 0.09, 0, &retval2); pModelDoc->ICreateLine2 ( 0, 0.09, 0, 0, 0, 0, &retval2 );//draw line pModelDoc->InsertSketch();//quit sketch

VARIANT_BOOL retvala;//define retvala VARIANT_BOOL retvalb;//define retvalb VARIANT_BOOL retvalc;//define retvalc VARIANT_BOOL retvald;//define retvald VARIANT_BOOL retvale;//define retvale VARIANT_BOOL retvalf;

pModelDoc->SelectByID(auT("Line2"), auT("SKETCHSEGMENT"),0,

pPartDoc->FeatureRevolve (6.28318530718, 0, 0, 0);//

pModelDoc->BlankSketch ( );// pModelDoc->ShowNamedView2(auT("*Isometric"),7);// pModelDoc->ViewZoomtofit2();//

////////the above codes are used to draw the cylinder and clear the sketch

pModelDoc->SaveAs4("Cylinder.stl", swSaveAsCurrentVersion, swSaveAsOptions_SaveReferenced, &retvalf); /////this want to be added to save the part as STL format... but the compiling errors is that error C2039: 'SaveAs4' : is not a member of 'IModelDoc' what is the problem? and also i am not sure if it is right to define the parameters in the saveas4 as swSaveAsCurrentVersion, swSaveAsOptions_SaveReferenced, &retvalf);

thanks for all the help