如何修改OdResBufPtr变量？

#pragma once
class CommandDoIt : public OdStaticRxObject 
{
public:
  const OdString localName() const { return globalName(); }
  const OdString groupName() const { return DD_T("DoIt"); }
  const OdString globalName() const { return OdString("DoIt"); }
  void execute(OdEdCommandContext* pCmdCtx)
  {
    OdDbCommandContextPtr pDbCmdCtx(pCmdCtx); 
    OdDbUserIOPtr pDbIO = pDbCmdCtx->dbUserIO();
    OdDbDatabasePtr pDb = pDbCmdCtx->database(); 
    //Always keap your head!!!
    OdResBufPtr pHead = OdResBuf::newRb(OdResBuf::kDxfXdInteger16, (short)0);
    OdResBufPtr pTail = pHead;
    for(short i = 1 ; i setNext(OdResBuf::newRb(OdResBuf::kDxfXdInteger16, i));
    }
    for(OdResBufPtr pTemp = pHead; !pTemp.isNull() ; pTemp = pTemp->next())
    {
       sds_printf(_T("\n%d"), pTemp->getInt16());
    }
    for(OdResBufPtr pTemp = pHead; !pTemp.isNull() ; pTemp = pTemp->next())
    {
       pTemp->setInt16(short(pTemp->getInt16() + 100));
    }
    for(OdResBufPtr pTemp = pHead; !pTemp.isNull() ; pTemp = pTemp->next())
    {
       sds_printf(_T("\n%d"), pTemp->getInt16());
    }
  }
};

#pragma once
// (entget(car(entsel)) '("MYAPP"))
class CommandPutIt : public OdStaticRxObject 
{
public:
  const OdString localName() const { return globalName(); }
  const OdString groupName() const { return DD_T("putIt"); }
  const OdString globalName() const { return OdString("putIt"); }
  void execute(OdEdCommandContext* pCmdCtx)
  {
    OdDbCommandContextPtr pDbCmdCtx(pCmdCtx); 
    OdDbUserIOPtr pDbIO = pDbCmdCtx->dbUserIO();
    OdDbDatabasePtr pDb = pDbCmdCtx->database(); 
    __int64 freq, start, end;
    try
    {
      if(pDb.isNull())
        throw OdError(eNoDatabase);
      if(!pDb->newRegApp(DD_T("MYAPP")))
        throw OdError("Can't Register appname"); 
      OdDbSelectionSetPtr pSS = pDbIO->select(DD_T("Select Entities: "));
      QueryPerformanceFrequency((LARGE_INTEGER*)&freq); 
      QueryPerformanceCounter((LARGE_INTEGER*)&start);
      OdDbObjectIdArray ids = pSS->objectIdArray();
      OdResBufPtr pHead = OdResBuf::newRb(OdResBuf::kDxfRegAppName,DD_T("MYAPP") );
      OdResBufPtr pTail = pHead;
      pTail = pTail->setNext(OdResBuf::newRb( OdResBuf::kDxfXdAsciiString, DD_T("String") ));
      pTail = pTail->setNext(OdResBuf::newRb( OdResBuf::kDxfXdInteger16, (short)32 ));
      for(size_t iter = 0 ; iter setXData(pHead);
      }
    }
    catch (OdError& e)//++-- Catch OdExceptions 
    {
      pDbIO->putString("\n" + e.description());
    }
    QueryPerformanceCounter((LARGE_INTEGER*)&end);
    sds_printf(_T("\n%g Seconds\n"), (double)(end - start) / (double) freq);        
  }
};
class CommandGetIt : public OdStaticRxObject 
{
public:
  const OdString localName() const { return globalName(); }
  const OdString groupName() const { return DD_T("GetIt"); }
  const OdString globalName() const { return OdString("GetIt"); }
  void execute(OdEdCommandContext* pCmdCtx)
  {
    OdDbCommandContextPtr pDbCmdCtx(pCmdCtx); 
    OdDbUserIOPtr pDbIO = pDbCmdCtx->dbUserIO();
    OdDbDatabasePtr pDb = pDbCmdCtx->database(); 
    __int64 freq, start, end;
    
    try
    {
      if(pDb.isNull())
        throw OdError(eNoDatabase);
      OdDbSelectionSetPtr pSS = pDbIO->select(DD_T("Select Entities: "));
      QueryPerformanceFrequency((LARGE_INTEGER*)&freq); 
      QueryPerformanceCounter((LARGE_INTEGER*)&start);
      OdDbObjectIdArray ids = pSS->objectIdArray();
      for(size_t iter = 0 ; iter xData(DD_T("MYAPP"));
        if(pHead.isNull())
          continue;
        OdResBufPtr pTail = pHead;
        pTail = pTail->next();
        pTail->setString(DD_T("New String"));
        pTail = pTail->next();
        pTail->setInt16( (short) 64);
        pEnt->setXData(pHead);
      }
    }
    catch (OdError& e)//++-- Catch OdExceptions 
    {
      pDbIO->putString("\n" + e.description());
    }
    QueryPerformanceCounter((LARGE_INTEGER*)&end);
    sds_printf(_T("\n%g Seconds\n"), (double)(end - start) / (double) freq);        
  }
};