setCopyFunc and Null Src Data

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kchan2++at++csc.com
Thu, 9 Sep 1999 20:35:43 +1000

Hi:

I assigned a data slot copy callback to a pfGroup. When the callback is
invoked, src->getUserData(slotNum) returns NULL. According to the man page, the
print, delete and copy callbacks are invoked when a pfobject has non null user
data in the slot. I am running IRIX 6.5 with performer 2.2.1

When src->getUserData returns NULL, I just exit the function without doing
anything to the data slot in dst. Any suggestions?

Here is the callback:

void copySlot( pfObject* dst, const pfObject* src )
{
  // get the destination node and delete its user data
  assert( dst );
  void* dstUserData = dst->getUserData( slot );
  if( dstUserData )
  {
    pfMemory::unrefDelete( dstUserData );
  }

  // get the source node's user data
  assert( src );
  void* srcUserData = src->getUserData( slot );

  if(!srcUserData)
    return;

  // share the source node's user data with the destination node
  pfMemory::ref( srcUserData );
  dst->setUserData( slot, srcUserData );
}

Regards
Kenneth Chan
__________________________________________________
CSC Australia
460 Pacific Hwy St Leonarrds NSW 2065
Ph: +61 2 9901 1165 Mobile: 0413 04 34 74 Fax: +61 2 9901 1665
Email: kchan2++at++csc.com.au

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