Creo 2.0 ProToolkit: Cannot get geometry item from constraint for datum point

@hi_01 all,

I am currently working on a project to get the geometry properties of joints within an assembly using ProToolkit. However, for Ball joints i am running into problems lately (should be the same for any other type of constraint, too).

When I select datum points as point alignment for the Ball Joint I get an error with bad inputs (line 8 of code below). If I use edges of the boxes instead, everything is working properly (code finishes).

My algorithm is as follows, (unfortunately I cannot copy-paste my complete code here, since it has been growing to big (I will try to add a small example asap)):

// collect geometry data of part

    ProModelitem partModelItemPos;

    partModelItemPos = _positionConstraint->getPartModeliItem();

    ProGeomitemdata* geomDataPart;

    error = ProGeomitemdataGet(&partModelItemPos, &geomDataPart);

    if (error != PRO_TK_NO_ERROR)

    {

        std::cout << "Error getting position data of Ball joint (part). Errorcode: " << error << std::endl;

        return error;

    }

    // collect geometry data of assembly

    ProModelitem assemblyModelItemPos;

    assemblyModelItemPos = _positionConstraint->getAssemblyModeliItem();

    ProGeomitemdata* geomDataAssembly;

    error = ProGeomitemdataGet(&assemblyModelItemPos, &geomDataAssembly);

    if (error != PRO_TK_NO_ERROR)

    {

        std::cout << "Error getting position data of Ball joint (assembly). Errorcode: " << error << std::endl;

        return error;

    }

    // get joint partner

    _partPath = _positionConstraint->getPartPath();

    _assemblyPath = _positionConstraint->getAssemblyPath();

    std::cout << "BallJoint found: its internal geometry type is: " << geomDataPart->obj_type << std::endl;

    // decide from partgeometry type what to do next

    switch (geomDataPart->obj_type)

    {

        case PRO_EDGE_START: // first point in line

        {

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

            {

                _jointPosition[i] = geomDataPart->data.p_curve_data->line.end1[i];

            } 

            std::cout << "local position of joint w.r.t partframe:" << std::endl << _jointPosition << std::endl;

            break;

        }

        case PRO_EDGE_END: // second point in line

        {

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

            {

                _jointPosition[i] = geomDataPart->data.p_curve_data->line.end2[i];

            }

            std::cout << "local position of joint w.r.t partframe:" << std::endl << _jointPosition << std::endl;

            break;

        }

        case PRO_POINT: // not checked yet

        {

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

            {

                _jointPosition[i] = geomDataPart->data.p_curve_data->point.position[i];

            }

            std::cout << "local position of joint w.r.t partframe:" << std::endl << _jointPosition << std::endl;

            break;

        }

My assumption is, that ProToolkit does not treat the datum point as a geometry feature. Is this true? How am I able to get the position of the Ball refence then, since any features within my part could be used as a geometry reference for that constraint.
I hope you understand my problem since I am not really experienced in the field of CAD itself.

Thank you very much for your help.

Best regards,

Andreas

Nachricht geändert durch Andreas Hofmann Can someone add this to toolkit category. I have no clue to do so. Thanks!

Nachricht geändert durch Andreas Hofmann Figured how to set the category