PositionHigh

Current byte position in the stream. Used only when the current position is greater than 2^31 (2147483648).

 

 

Long

Since the Position property is a Long, it is unable to be set to a value greater than 2^31. To set the position of a DartStream to a value greater than 2^31, first set this property to an integer value which will be multiplied by 2^31, then added to Position to determine the actual position.