Hi @Mikael,
did you activate AttachChunk when using the GenTL?
You can refere to here (only samples for .NET and Python): https://forum.commonvisionblox.com/t/using-chunk-data-in-cvb/1895
Otherwise you could use this C++ code snippet to activate AttachChunk using GenTL:
auto vinDeviceNodemap = VinDeviceNodeMap(dev);
auto AttachChunk_node = vinDeviceNodemap->Node<Cvb::BooleanNode>(Cvb::String("AttachChunk"));
AttachChunk_node ->SetValue(true);
Afterwards handling ChunkData is equal to using the vin driver.