Adding an AngleConstraint

Here's what I use:

bool AddAngleConstraintOfTwoWorkAxisProxies (CComPtr<AssemblyComponentDefinition>& pAsmCompDef,

                                             CComPtr<WorkAxisProxy>& pWAProxyA,

                                             CComPtr<WorkAxisProxy>& pWAProxyB,

                                             const double kRadsAngle) 

{

    // Get the list of constraints of the assembly so you can add a new one

    CComPtr<AssemblyConstraints> pConstraintList  ;

    HRESULT hRes = pAsmCompDef->get_Constraints(&pConstraintList) ;

    if (FAILED(hRes) || (pConstraintList == nullptr)) {

        ShowCOMError (hRes,L"AddAngleConstraintOfTwoWorkAxisProxies could not get constraints.") ;

        return false ;

    }

    CComVariant varReal(kRadsAngle);

    CComPtr<AngleConstraint> pAngleConstraint  ;   

    hRes = pConstraintList->AddAngleConstraint(pWAProxyA, pWAProxyB,

                                               varReal,

                                               kDirectedSolution,

                                               gkvarEmpty,

                                               gkvarEmpty,

                                               gkvarEmpty,

                                               &pAngleConstraint);

    if ((FAILED(hRes) || (pAngleConstraint == nullptr))) {

        ShowCOMError (hRes,L"AngleConstraint failed") ;

        return false ;

    }

    return true ;

}