The GetElementProperty function
The GetElementProperty can only be used in the Util tab expression, not in the Value tab expression.
The properties, element name and level number, are quite easy to understand and do not pose particular difficulties. The byte offset property is less evident and needs at least one concrete example.
Example: Using getElementProperty in a Flat structure
It contains three (3) fields - a, b, and c. Each field has an initiator that allows to detect when a field begins in the input data.
See the three fields delimited by the initiators a, b, and c. The c field starts with string 000 that should be skipped. To get the desired result, use GetElementProperty combined with SetElementProperty.
The GetElementProperty function gets the current byte offset of the c element, which is the absolute offset of the C character in the sample data. Since you want to skip the next three 0 characters, add three (3) to the returned offset and set the result to the byte offset property of the c element. Using this mechanism, you bypass the 000 string.