【转帖】cloning a block
 

cloning a block
cloning a block
hi, i'm a bit stunned on how to clone a block.
in the following example dwgdirect triggers an assert (debug version) and crashes.
code:
class myservices : public exsystemservices, public exhostappservices {
protected:
odrx_using_heap_operators(exsystemservices);
};
int main() {
odstaticrxobject<myservices> tsvcs;
odinitialize(&tsvcs);
tsvcs.disableoutput(true);
odinitialize(&tsvcs);
oddbdatabaseptr tdb(tsvcs.createdatabase());
oddbobjectid tblockid, tcircleid;
{
oddbblocktableptr tblocks(tdb->getblocktableid()
.safeopenobject(oddb::kforwrite));
oddbblocktablerecordptr tblock(oddbblocktablerecord::createobject());
tblock->setname("foo");
tcircleid = tblock->appendoddbentity(oddbcircle::createobject());
tblockid = tblocks->add(tblock);
}
oddbobjectidarray tids;
tids.append(tblockid);
oddbidmappingptr tidmap(oddbidmapping::createobject());
tidmap->setdestdb(tdb);
tdb->deepcloneobjects(tids, tdb->getblocktableid(), *tidmap); // crashcreating a new block and deep cloning the content of the source block
into the new block doesn't work either (the new block is still empty).
on the other hand, a deep copy from a set of model space entities
into a new block does work.
what's wrong here?
update:
deep cloning an anonymous block (like *e) does work.
and it seems there is a workaround for cloning a named block
(which is explodable):
- create a dummy block ref referencing the block
- create a new block b
- call oddbblockreference::explodetoblock(b) on the dummy reference
- delete the dummy reference
nevertheless, i feel it should be possible to clone a named block
(with name mangling settings) or to clone non-modelspace block entities
into a different non-modelspace block. thoughts?
quote:
originally posted by david hoek
update:
deep cloning an anonymous block (like *e) does work.
and it seems there is a workaround for cloning a named block
(which is explodable):
- create a dummy block ref referencing the block
- create a new block b
- call oddbblockreference::explodetoblock(b) on the dummy reference
- delete the dummy reference
nevertheless, i feel it should be possible to clone a named block
(with name mangling settings) or to clone non-modelspace block entities
into a different non-modelspace block. thoughts?
deep cloning of the contents of the one block to another definitely works, and modelspace is not different from any other block, probably you did something wrong.
as for cloning block table record - it doesn't work in arx even for anonymous blocks.
vladimir
last edited by vkalinin; 16th june 2008 at 09:38 amfff">.
quote:
originally posted by wvk
as for cloning block table record - it doesn't work in arx even for anonymous blocks.
ok, thanks for explaining that!
quote:
originally posted by wvk
deep cloning of the contents of the one block to another definitely works
yep, i really hope i'm doing something wrong, but, frankly, i don't see
what's wrong.
if i create a blocked circle entity and try to clone the circle
via deepcloneobjects() to the new block, the new block is still
empty. i can reproduce this with the following trivial program,
where the content of block2 is still empty. i'd be deeply grateful
if you point me to some error i made.
code:
#include <odacommon.h>
#include <dbblocktablerecord.h>
#include <dbblocktable.h>
#include <dbcircle.h>
#include <dbidmapping.h>
#include <exservices/exsystemservices.h>
#include <exservices/exhostappservices.h>
#include <exservices/odfilebuf.h>
#include <iostream>
class myservices : public exsystemservices, public exhostappservices {
protected:
odrx_using_heap_operators(exsystemservices);
};
int main() {
odstaticrxobject<myservices> tsvcs;
odinitialize(&tsvcs);
try {
tsvcs.disableoutput(true);
odinitialize(&tsvcs);
oddbdatabaseptr tdb(tsvcs.createdatabase());
oddbblocktableptr tblocks(tdb->getblocktableid()
.safeopenobject(oddb::kforwrite));

// create a block with a circle inside
oddbblocktablerecordptr tblock(oddbblocktablerecord::createobject());
tblock->setname("*e");
oddbobjectid tcircleid(
tblock->appendoddbentity(oddbcircle::createobject()));
tblocks->add(tblock);
// create another block
oddbblocktablerecordptr tblock2(oddbblocktablerecord::createobject());
tblock2->setname("*e");
oddbobjectid tblock2id(tblocks->add(tblock2));
// clone the circle to the new block
oddbidmappingptr tidmap(oddbidmapping::createobject());
tidmap->setdestdb(tdb);
oddbobjectidarray tids;
tids.append(tcircleid);
tdb->deepcloneobjects(tids, tblock2id, *tidmap);
odwrfilebuf tfb("sandbox.dwg");
tdb->writefile(&tfb, oddb::kdwg, oddb::vac18);
}
catch(oderror& e) {
std::cout << "*** " << e.description() << std::endl;
}
you are adding an entity to a ndbro block (check returned circle id).
you shoudl first add block to database.
vladimir
quote:
originally posted by wvk
you are adding an entity to a ndbro block.
thanks a lot!