Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: BaseDraw
DOODLEOBJECT_BDParameter: Current Image
DOODLEOBJECT_IMAGEParameter: New Frame
DOODLEOBJECT_ADDIMAGEParameter: Delete Frame
DOODLEOBJECT_DELIMAGEParameter: Clear Frame
DOODLEOBJECT_CLEARFRAMEParameter: Set Viewport
DOODLEOBJECT_SETBDParameter: Load Bitmap
DOODLEOBJECT_LOAD_BITMAPParameter: Remove Unused
DOODLEOBJECT_REMOVE_UNUSEDParameter: Export
DOODLEOBJECT_EXPORTParameter: Import
DOODLEOBJECT_IMPORTParameter: Export Format
DOODLEOBJECT_EXPORT_FORMATParameter: Size X
DOODLEOBJECT_SIZE_XParameter: Size Y
DOODLEOBJECT_SIZE_YParameter: Ghost Previous
DOODLEOBJECT_GHOST_PREVParameter: Ghost Next
DOODLEOBJECT_GHOST_NEXTParameter: Draw Smoothly
DOODLEOBJECT_SMOOTHVIEWParameter: Save Compressed
DOODLEOBJECT_SAVECOMPRESSEDParameter: Current View
DOODLEOBJECT_CURRENTVIEWParameter: Title
DOODLEOBJECT_TITLEParameter: Description
DOODLEOBJECT_BODY