Iterating through children

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On 06/03/2011 at 14:18, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12 
Platform:   Windows  ;   
Language(s) :     C++  ;

---------
Hello,

I would like to Iterate through the children of a particular object in the OM.  Let's call this object BOB.  So I would like to check first to see if BOB has any children.. So I do this with

  
 if(BOB->GetDown()){  
  
  
//Do Something  
}  

Now inside of that If statement I would like to iterate through all of the children that BOB has to see if any of his children have a particular name..

so in my head it looks like this..

  
 if(BOB->GetDown()){  
  
for(BOB->GetDown() ; BOB->GetLast() ; BOB->GetDown->GetNext()){  
  
GePrint(op->GetName());  
  
}  
  
}  

So I have an idea of how it should be done but I am a little fuzzy on all the details.    Could someone drop me a sample code of how I should do it?

Thanks so much..

~Shawn

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On 06/03/2011 at 14:42, xxxxxxxx wrote:

I think I figured it out...   This is what I am doing now..  Please let me know if there is a better way.

  
  
if (objectToOrbit->GetDown()){  
        
      BaseObject *obj = objectToOrbit->GetDown();  
      while(obj)  
      {  
          if(obj->GetName() == "Orbit Path"){  
              GePrint("FOUND THE MONKEY");  
          }  
          obj = obj->GetNext();  
      }  
  }  
  

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On 06/03/2011 at 15:00, xxxxxxxx wrote:

Hehe, why did you first call "GetLast()" ? ^^
If you use GetNext() after GetLast() there will be none.

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On 06/03/2011 at 15:03, xxxxxxxx wrote:

I think the method in the second post will work fine, it's the method I use (for what that's worth!!). The only problem is if your child objects themselves have children and you need to check those. You need a recursive function if that's the case, but for a single level of child objects this looks fine.

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On 07/03/2011 at 01:05, xxxxxxxx wrote:

To iterate through the complete hierarchy of a document do something like this.

  
void WalkTheHierarchy(BaseObject *op)  
{  
   while(op)  
  {  
      StatusSetSpin();  
      // do something with op....  
      GePrint(op->GetName());  
  
      WalkTheHierarchy(op->GetDown());  
  
      op = op->GetNext();  
  }  
}  
  
...  
  
WalkTheHierarchy(doc->GetFirstObject());  

You could have found this information in the forum btw, please use the forum search.

cheers,
Matthias

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On 07/03/2011 at 05:25, xxxxxxxx wrote:

While "WalkTheHierarchy(op->GetDown())" is just fine, you can increase performance and avoid pushing onto/popping off a bunch of stack stuff by doing a quick check first:

...
if (op->GetDown()) WalkTheHierarchy(op->GetDown());
...

This adds a conditional and a duplicate call but it means that you stay within this iteration of the recursion without needless recursion stacking.

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On 10/03/2011 at 09:55, xxxxxxxx wrote:

Thanks Guys!