How get shape of path's end ("end end" and "end start") marker. inDesign plug-in SDK

Question

I try two variant:Utils<IGraphicAttributeUtils>()->GetLineEndStartImplementation(m_EndStartMarker, styleDescriptor);
// IPathEndStroker* stroker = (IPathEndStroker*)styleDescriptor->QueryAttribute(kGraphicStyleLineEndStartAttrBoss, IID_IPATHENDSTROKER);
IPathEndStroker* stroker = (IPathEndStroker*)styleDescriptor->QueryAttribute(m_EndStartMarker, IID_IPATHENDSTROKER);Both stroker receive nullptr. But variable m_EndStartMarker receive right value. Do not found any mension about it at SDK samples.

Dirk Becker · Answer

The persistent interfaces of kGraphicStyleLineEndStartAttrBoss and kGraphicStyleLineEndEndAttrBoss are IID_IGRAPHICATTR_CLASSID and IID_IINDETERMINATE_DATA.

IID_IPATHENDSTROKER is an interface on kPathEndStrokerService providers that are used perform the actual rendering, with concrete providers such as kBarArrowHeadBoss or kSquareSolidArrowHeadBoss. I'd expect those boss constants in the IID_IGRAPHICATTR_CLASSID, but can't verify that at the moment (looking at static old documents that have only kInvalidClass in there).

I also haven't had to deal with those IID_IINDETERMINATE_DATA, I'd first look for some related utils or facade.

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