【转帖】obtaining group informations
 

obtaining group informations.
obtaining group informations.
i have a .dxf file composed of a set of entities, those entities are "grouped" together in autocad, and they have attached "pointers" in the dxf file.
i'm using dwgdirect, and i need to be able to find those group of entites. could you help me to find the functions i should use. thanks a lot.
example of an entity in the .dxf
0
arc
5
1034
102
{acad_reactors
330
11f9 <- pointer here
102
}
this pointer seems to be defined in a dictionnary latter by:
100
acdbdictionary
281
1
3
*a1 <- name ?
350
11f9 <- pointer here
it appears also latter ...
0
group
5
11f9 <- here
102
{acad_reactors
330
26
102
}
330
26
100
acdbgroup
300
70
1
71
1
340
72d
340
oddbdatabase:: getgroupdictionaryid() returns id of group dictionary.
iterating through group dictionary (see dbdictionary.h) you can get oddbgroup objects. oddbgroup:: newiterator() returns iterator to access the list of entities in group (see dbgroup.h)
sergey slezkin
thanks a lot for your help. i still have a few questions.
why oddbgroupiterator is different from oddbobjectiterator ? both of them are used to iterate on entities isn't it.
is there a way to know for an entity its group (if there is one, can an entity be in more than one group?).
group iterator has a bit different functionality from object iterator. (forward/back, from id, skip erased etc.)
if an entity is in group group's id presents in entity's reactor list. so if one of entity's reactors is a group object the entity may be in the group. i can't imagine other reason why a group can be entity's reactor but not sure if it's a reliable method.
entity can be the member of more than one group.
sergey slezkin