[求助]扩展记录老是出错

孤云

ads_name entName;
 ads_point pt;
 AcDbObjectId id;

 acedEntSel("选择实体:", entName, pt);
 acdbGetObjectId(id, entName);
 AcDbEntityPointer entPtr(id, AcDb::kForWrite);

 entPtr->createExtensionDictionary();
 id = entPtr->extensionDictionary();

 AcDbDictionaryPointer dictPtr(id, AcDb::kForWrite);
 AcDbXrecord* pXrec = new AcDbXrecord;
 dictPtr->setAt("AA", pXrec, id);

 struct resbuf* pRb = acutBuildList(RTSTR, "abc", RTNONE);
 pXrec->setFromRbChain(*pRb);
 pXrec->close();
 acutRelRb(pRb);

为一个实体添加扩展记录,老是在 pXrec->setFromRbChain(*pRb); 这一句出错..

说什么C0000005错误..

帮我看看啊..谢了..