Get Layer Groups from C++ plugin

Hi!

I'm trying to get next things:

1) layers hierarchy

2) layers bounds rect

3) save every layer to PNG file

--

Currently I can only get list of layers:

auto&layerInfo = globals->exportParamBlock->documentInfo->layersDescriptor;

for (int i = 0; i < layerN; ++i)

{

                    std::u16string utfStr = layerInfo->unicodeName;

  layerInfo = layerInfo->next;

}

Help me, please!