Export text from a text frame as Indesign tagged text or RTF - Adobe Indesign

Export works on a selection so only doing parts is fine. If you want to work without a selection suite you can use:

InterfacePtr<ITextTarget> mtTarget((ITextTarget*)CreateObject(kTextSuiteBoss, IID_ITEXTTARGET));

mtTarget->SetTextUnmanaged(textModelRef, RangeData(s, e, RangeData::kLeanForward));

to do the export in tagged text

InterfacePtr<IExportProvider> provider((IExportProvider*)CreateObject(kTaggedTextExportFilterBoss, IID_IEXPORTPROVIDER));

InterfacePtr<IDocument> doc(......);
IXferBytes xfer; // some class that implements this interface and does what you want.

InterfacePtr<IPMStream> pmStream(StreamUtil::CreateMemoryStreamWrite(&xfer));

provider->ExportToStream(pmStream, doc.get(), mtTarget, "InDesign Tagged Text", kSuppressUI);

Ian