|
|
发表于 2004-9-25 00:31:00
|
显示全部楼层
不太明白:
rex12:
With acdbOpenAcDbEntity() you can open ONLY Objects derived from AcDbEntity,
With acdbOpenAcDbObject() you can open ONLY Objects NOT derived from AcDbEntity(that is, have no graphics).
acdbOpenObject()-> there are more possibilities. All descriptions you will find in docs.
That is a mention for objects openning. There is no matter if you want to open an AcDb Entity or AcDbObject derived object.
Art Cooney:
That's not correct. acdbOpenAcDbObject() will open objects that are derived from AcDbEntity - it will open any type of object.
rex12:
well it's may be, I haven't try it, all i have done was to read reference and there that is written.
So the reference is not correct or ...?
Generally, I use acdbOpenObject function to open an object.
Best Regards
Art Cooney:
acdbOpenAcDbEntity() checks to see if the object being opened is of a class directly or indirectly derived from
AcDbEntity and returns an error if it is not.
It also takes a reference to an AcDbEntity* as an argument and sets it to point to the opened entity.
acdbOpenAcDbObject will open any object. It takes a reference to an AcDbObject* as AcDbObject* as an argument and
sets it to point to the opened object.
acdbOpenObject() is template function that is implemented for each class and takes a reference to a pointer to that
class and sets it to point to the opened object. This function uses acdbOpenAcDbObject() to do the actual open operation.
|
|
置顶卡
