yang686526

smart pointer problem

smart pointer problem
hi,
creating my first mfc application using directdwg i got this problem:
i have a class that contains the database:
code:
class cdwglayer
: public clayer // my base class
, public exsystemservices
, public exhostappservices
i'm trying to create it in another class and to add a pointer to it in a list.
i tried in this way:
code:
odsmartptr< cdwglayer > player = odrxobjectimpl<cdwglayer>::createobject();
/* various elaborations */
inwspace->addlayer( player.get() );
the problem is this compiling error:
e:\devel\geowerks\supportlib\directdwg\include\sma rtptr.h(336): error c2594: 'static_cast' : ambiguous conversions from 'odrxobject *' to 'cdwglayer *'
what's wrong in my code?
thank you in advance,
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============

myzhar
# 7th february 2006, 10:00 am

registered user join date: sep 2003
location: russia
posts: 1,828
you cannot create smart-pointer on the object doubly inherited from odrxobject. (the same way you would have difficulties, inheriting from cobject twice)
perhaps it's not a good idea, to inherit database object from services. hostappservices are application abstraction, they should be unique. the same are systemservices, that abstract low level system routines.
vladimir

vkalinin
# 7th february 2006, 10:06 am

registered user join date: feb 2006
location: pisa
posts: 69

i supposed the problem was this.
how do i create the database then?
the code
code:
// create a custom hostappservices object.
odrxobjectimpl<exhostappservices> svcs;
odinitialize(&svcs); // dwgdirect initialization
oddbdatabaseptr pdb; // a smart pointer to a database
// create a database and load the drawing into it.
pdb = svcs.readfile("drawing1.dwg");
// do something with the database.
pdb.release(); // delete the database before odunitialize() is called.
oduninitialize(); // dwgdirect termination
in documentation file is wrong odinitialize(&svcs); needs exsystemservices, not exhostappservices......
which is then the right way to create a database and load the dwg file?
thank you,
walter
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============

myzhar
# 7th february 2006, 10:16 am

registered user join date: sep 2003
location: russia
posts: 1,828
if your cdwglayer represents application (at the module level), then of course you should inherit it from both interaces.
the simplest way to instantiate the class inherited from 2 odrxobjects is to use odstaticrxobject<> as demonstrated in samples.
vladimir

vkalinin
# 7th february 2006, 10:31 am

registered user join date: sep 2003
location: russia
posts: 1,828
well, of course you may separate systemservices and hostappservices.
in that case you should have to initialize dd with systemservices, and create database with hostappservices.
but that seems not to be practical.
vladimir

vkalinin
# 8th february 2006, 12:35 am

registered user join date: feb 2006
location: pisa
posts: 69

i think i need to separate them.
my dwgdirect is not the application, but one "drawing layer" of few other kind of "drawing layer".
i'll try to make what you subjested me...
thank you,
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============

myzhar
# 8th february 2006, 02:20 am

registered user join date: feb 2006
location: pisa
posts: 69


perfect,
separating them i'm able to load the dwg correctly
now the problem is the rendering... but this is another thread
thank you
walter
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============

myzhar

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you cannot create smart-pointer on the object doubly inherited from odrxobject. (the same way you would have difficulties, inheriting from cobject twice)
perhaps it's not a good idea, to inherit database object from services. hostappservices are application abstraction, they should be unique. the same are systemservices, that abstract low level system routines.
vladimir

i supposed the problem was this.
how do i create the database then?
the code
code:
// create a custom hostappservices object.
odrxobjectimpl<exhostappservices> svcs;
odinitialize(&svcs); // dwgdirect initialization
oddbdatabaseptr pdb; // a smart pointer to a database
// create a database and load the drawing into it.
pdb = svcs.readfile("drawing1.dwg");
// do something with the database.
pdb.release(); // delete the database before odunitialize() is called.
oduninitialize(); // dwgdirect termination
in documentation file is wrong odinitialize(&svcs); needs exsystemservices, not exhostappservices......
which is then the right way to create a database and load the dwg file?
thank you,
walter
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============
if your cdwglayer represents application (at the module level), then of course you should inherit it from both interaces.
the simplest way to instantiate the class inherited from 2 odrxobjects is to use odstaticrxobject<> as demonstrated in samples.
vladimir
well, of course you may separate systemservices and hostappservices.
in that case you should have to initialize dd with systemservices, and create database with hostappservices.
but that seems not to be practical.
vladimir

i think i need to separate them.
my dwgdirect is not the application, but one "drawing layer" of few other kind of "drawing layer".
i'll try to make what you subjested me...
thank you,
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============


perfect,
separating them i'm able to load the dwg correctly
now the problem is the rendering... but this is another thread
thank you
walter
myzhar
==============
ing. walter lucetti
geomind srl
pisa - italy
==============