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Get Spline Points Example (C++)

This example shows how to get the points on a spline.

//-------------------------------------------------------
// Preconditions: 
// 1. Start up SOLIDWORKS and open a new part document.
// 2. Sketch a spline.
// 3. Select the Sketch1 feature of the spline in the 
//    FeatureManager design tree. 
//
//    NOTE: Do not select the spline in the graphics area. This 
//    causes an assert, which results in you having to abort and
//    terminate the debug session.
//
// 4. Start Microsoft Visual Studio 2010.
//    a. Click File > New > Project > Visual C++ > 
//       Win32 Console Application.
//    b. Type the name of your project in Name.
//    c. Click OK.
//    d. Click Next.
//    e. Select ATL and click Finish.
//    f. Click Project > projectname Properties > Configuration Properties > 
//       C/C++ and type the path to sldworks.tlb and swconst.tlb,  
//       typically C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS, 
//       in Additional Include Directories.
//    g. Click OK.
//    h. Click Tools > Options > Debugging > General and select 
//       Redirect all Output Window Text to the Immediate Window.
//    i. Click OK.
// 5. Open the Immediate Window.
// 6. Replace the code in the code window with this code.
// 7. Click Debug > Start Debugging
// 8. Click Yes.
//
// Postconditions: 
// 1. Prints to the Immediate Window the number
//    of spline points followed by the x, y, z
//    values of each point in the spline.
// 2. Examine the Immediate Window.
//-------------------------------------------------------
 
//This code 
#include "stdafx.h"
#import "sldworks.tlb" raw_interfaces_only, raw_native_types, no_namespace, named_guids  // SOLIDWORKS type library
#import "swconst.tlb" raw_interfaces_only, raw_native_types, no_namespace, named_guids   // SOLIDWORKS constants type library
#include <iostream>
#include <sstream>
 
int _tmain(int argc, _TCHAR* argv[])
{
	// Initialize COM
	// Do this before using ATL smart pointers so that 
	// COM is available
	::CoInitialize(NULL);
 
	{
		//Use ATL smart pointers
		CComPtr<ISldWorks> pSwApp;
		if(pSwApp.CoCreateInstance(L"Sldworks.Application", NULL, CLSCTX_LOCAL_SERVER) != S_OK) {
			return(0);            
		}
 
		CComPtr<IModelDoc2> pSwModel;
		pSwApp->get_IActiveDoc2(&pSwModel);
 
		//Get the selected sketch feature
		CComPtr<ISelectionMgr> pSwSelMgr;
		pSwModel->get_ISelectionManager(&pSwSelMgr); 
		IDispatch *pDisp;
		pSwSelMgr->GetSelectedObject6(1, -1, &pDisp); 
 
		CComPtr<IFeature> pSwFeat;
		if(S_OK == pDisp->QueryInterface(IID_IFeature, (void**)&pSwFeat));
		pDisp = NULL;
 
		//Get the sketch feature
		pSwFeat->GetSpecificFeature2(&pDisp);
		CComPtr<ISketch> pSwSketch;
		if(S_OK == pDisp->QueryInterface(IID_ISketch, (void**)&pSwSketch));
		pDisp = NULL;
 
		//Gets the spline points by interpolation 
		VARIANT vSplines;
		::VariantInit(&vSplines);
		pSwSketch->GetSplinesInterpolate(&vSplines);
 
		CComPtr<IDispatch> pDispatchSafeArray = NULL;
		CComPtr<ISafeArrayUtility> pSwSafeArray = NULL;
		HRESULT hres;
		hres = pSwApp->GetSafeArrayUtility(&pDispatchSafeArray);
		hres = pDispatchSafeArray.QueryInterface<ISafeArrayUtility>(&pSwSafeArray);
 
		//First value in vSplines array is the number of
		//sketch (or spline) points, followed by the x, y, z
		//coordinates of each point in the spline, so calculate 
		//the size of the array 
		long nbrSketchPoints;
		pSwSketch->GetSketchPointsCount2(&nbrSketchPoints);
		long splineArraySize = 1 + (nbrSketchPoints * 3);
 
		//Print to the Immediate Window the
		//number of spline points followed by the 
		//x, y, z values of each of point in the spline
		for (int idx = 0; idx < splineArraySize; idx++)
		{
			double sketchPointValue;
			pSwSafeArray->GetDouble(vSplines, idx, &sketchPointValue);
			_bstr_t s;
			s = (double)sketchPointValue;
 
			OutputDebugString(s + "\n");
		}
 
	}
 
	//Initialize COM
	::CoUninitialize();
 
	return(0);
}


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