向块添加属性

 
 typedef AcDbObjectPointer AcDbBlockReferencePointer;
 static void ArxBlockSamp_doit(void)
 {
  TCHAR blockName[134]; // alloc space for our blockname
  AcDbObjectId btrId = AcDbObjectId::kNull ; // create a null ID
  AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();
  if(acedGetString(0,_T("\nEnter a Block Name: "),blockName) != RTNORM)
  {
   acdbFail( _T("@acedGetString"));
   return;
  }
  //call helper to get the ID of block
  if(getBlockTableRecordId(blockName,btrId,pDb) != eOk)
  {
   acdbFail( _T("@getBlockRecordId"));
   return;
  }
  // smart pointer to block
  AcDbBlockTableRecordPointer pBlockTableRecordPointer(btrId,AcDb::kForWrite);
  if(pBlockTableRecordPointer.openStatus() != eOk)
  {
   acdbFail( _T("@pBlockTableRecordPointer.openStatus"));
   return; 
  }
  // a pointer to a new AcDbAttributeDefinition, I use a normal pointer
  // here because I want to use the ctor & I want to use it later
  AcDbAttributeDefinition *pAttributeDefinition = 
     new AcDbAttributeDefinition(pBlockTableRecordPointer->origin(),
                                 _T("Text"), _T("Tag"), _T("Prompt"));
  // add the new AcDbAttributeDefinition to block
  if(pBlockTableRecordPointer->appendAcDbEntity(pAttributeDefinition) != eOk)
  {
   delete pAttributeDefinition;
   acdbFail( _T("@pBlockTableRecordPointer->appendAcDbEntity"));
   return;
  }
  pAttributeDefinition->downgradeOpen(); // make sure its readonly 
  AcDbObjectIdArray blockReferenceIds;   // array to hold BlockReferenceIds
  pBlockTableRecordPointer->getBlockReferenceIds(blockReferenceIds);
  // helper to update BlockReferences
  updateBlockReferences(blockReferenceIds, pAttributeDefinition );
  pAttributeDefinition->close(); // clean up;
  acutPrintf(_T("Ok!"));
 }
 static void updateBlockReferences(const AcDbObjectIdArray &blockReferenceIds,
                                   AcDbAttributeDefinition *pAttributeDefinition)
 {
  for(int i = 0 ; i blockTransform(); 
   AcDbAttribute *pAttribute = 
         new AcDbAttribute(pAttributeDefinition->position().transformBy(mat),
                           pAttributeDefinition->textStringConst(),
                           pAttributeDefinition->tagConst());
   if(pBlockReferencePointer->appendAttribute(pAttribute)!= eOk)
   {
    delete pAttribute;
    continue;
   }
   pAttribute->close();
  }
 }
 static Acad::ErrorStatus getBlockTableRecordId(LPCTSTR name, AcDbObjectId &btrId, 
                                                AcDbDatabase *pDb)
 {
  Acad::ErrorStatus stat = eOk;
  AcDbBlockTablePointer pBlocktable(pDb->blockTableId(), AcDb::kForRead);
  stat = pBlocktable.openStatus();
  if(stat != eOk)
   return stat;
  if(pBlocktable->has(name))
   return pBlocktable->getAt(name,btrId);
  else
   return Acad::eNotInDatabase;
 }