Storing Objects in Containers

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On 26/10/2005 at 14:40, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   8.503 
Platform:      Mac OSX  ; 
Language(s) :     C++  ;

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     Hello again all.

One of the objects in my plugin needs to store an array of other objects of a certain type in its container. I was looking at the sdk documentation and did not see any way of storing a BaseObject in a container. Is there some easy way to do this or do I need to do something like store the names of all the objects and search for them each time I need them?

Thanks.

Aaron M

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On 26/10/2005 at 14:57, xxxxxxxx wrote:

Use BaseContainer::SetLink to store a BaseLink.

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On 26/10/2005 at 22:15, xxxxxxxx wrote:

I was thinking that might be I would need to try, but I didn't quite understand the documentation. Do I have to declare a variable of the type BaseLink such as this:

BaseLink* o1=op.GetLink();

op being a BaseObject. The BaseLink can be an array also, correct? I haven't been able to understand much about Alloc() either. Does this apply here too?

Thanks.

Aaron M

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On 26/10/2005 at 23:26, xxxxxxxx wrote:

The link is returned as a base-level BaseList2D class. It can store anything derived from this class (BaseObject, BaseTag, and so forth). There is also a GetObjectLink() variation which will return the pointed link as a BaseObject*. Otherwise, cast the returned pointer to the type being set:

BaseTag* t1 = static_cast<BaseTag*>(op->GetDataInstance()->GetLink(ID_TAGLINK, baseDocument));

BaseObject doesn't have a GetLink() method (either declared or inherited). Most of the time, you get and set your BaseLinks through the object's BaseContainer (GetDataInstance() is one way to get to it) and requires a generic LONG ID value.

No, the link is to a single instance of one of the classes mentioned above. One link per ID only. To store multiple objects, you will need multiple IDs.

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On 27/10/2005 at 08:21, xxxxxxxx wrote:

Thankyou Robert.  This will clear up a lot, and now I'll go do some experimentation and see what I can accomplish.
                    Aaron M

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On 27/10/2005 at 15:41, xxxxxxxx wrote:

A question regarding this matter.

If you use the BaseContainer->SetLink(), does the BaseObject need to be in the document as a requirement?

The reason I ask is that I created a BaseObject, and only using it as a reference object, so I don't add it into the document.

Would this be saved too with SetLink?

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On 27/10/2005 at 16:18, xxxxxxxx wrote:

The only thing that leads me to believe that the BaseObject must be in the document is that whenever GetLink() or a variation is called, there is a BaseDocument* argument. And there is no mention that it can be NULL.