Max wrote:
Can anybody please explain the purpose of subtree array (ett_...)?
I don't get why should i have several different etts in my dissector's
code, while there is no information assotiated with these integers.
Each ett_ stores information about whether the particular subtree
created using that variable is expanded or not.
For example, if a GUI user expands subtree B (but not A or C) and if the
3 subtrees use different ett_ variables then when the user clicks on the
next packet then only subtree B will be automatically expanded. I find
this behavior extremely useful when I'm comparing information (hanging
off that subtree) between packets.
If OTOH only one ett_ variable is used for all 3 subtrees then all 3
subtrees in the next packet will be either expanded or collapsed
(depending on the last action of the user on the last packet--whether
they last expanded a subtree or collapsed one).
