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Get Curve Spline Points Example (C++ COM)

This example shows how to get the point coordinates from a selected sketch spline segment.

The methods ICurve::IGetSplinePts and ICurve::IGetBCurveParams return arrays, so this code must be used in an in-process DLL. Otherwise, use the methods ICurve::GetSplinePts and ICurve::GetBCurveParams that return VARIANTs.


void GetCurveSplinePoints(ISldWorks* m_pSldWorks)


 HRESULT hres;


 hres = m_pSldWorks->get_IActiveDoc2(&pModelDoc);

 if( pModelDoc == NULL)





 pModelDoc->get_ISelectionManager( &pSelectMgr);

 if( pSelectMgr)


  pSelectMgr->IGetSelectedObject3( 1, &pUnk);






 if( pUnk)


  pUnk->QueryInterface( IID_ISketchSegment, (void **)&pSketchSeg);


  pUnk = NULL;




 if( pSketchSeg)


  pSketchSeg->IGetCurve( &pCurve);




 if( pCurve)


  long nParamSize;

  pCurve->IGetBCurveParamsSize2( FALSE, TRUE, &nParamSize);

  double *dSplineParams = new double [nParamSize];


  pCurve->IGetBCurveParams( dSplineParams);

  int *propArray = (int*)&dSplineParams[0];


  double *dKnotArray = &dSplineParams[2];

  double *dCtrlArray = &dSplineParams[ 2+ propArray[1]+propArray[2] ];


  long nSplinePts;

  pCurve->IGetSplinePtsSize( propArray, dKnotArray, dCtrlArray, &nSplinePts);

  double *dSplinePts = new double[nSplinePts];


  pCurve->IGetSplinePts( dSplinePts);


  for( int i = 0; i < nSplinePts; i += 3)


   TRACE( auT("x = %f, y = %f, z = %f\n"),


   dSplinePts[i], dSplinePts[i+1], dSplinePts[+2]);




  delete [] dSplineParams;

  delete [] dSplinePts;






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