A class that deals with data in Dcsbuffer.
|Property||(NSInteger) currentIndex||Returns or sets the index of current operated data in DcsBuffer.|
|(nonatomic, assign) NSInteger currentIndex|
|Description||Returns or sets the index of currently operated data in DcsBuffer.|
|Remarks||If Dcsbuffer is empty, currentIndex is -1, you can also set currentIndex to -1.
If DcsBuffer is not empty, when you set currentIndex to a negative value, or a value that equals/is larger than count, it will fail and throw an exception called DcsValueOutOfRangeException.