When to use it
After setting the size using the SetDemandPiece method and before the OnFinish event ends.
ExternalID: Long /*[out]*/
GetDemandPiece returns information about each piece to be cut.
The number of pieces to be cut is given by the NumberOfDemandPieces property.
The information of each piece can be set using the SetDemandPiece method.
Index - the index of the piece whose information are extracted. This number is in range [0...NumberOfDemandPieces - 1].
Length - the length of the piece.
Quantity - the number of pieces that must be cut.
ExternalID is the external ID of the demand piece whose input index is Index. External ID is an integer number which was assigned to each piece in order to be easier identified.
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