内存偏移

_UL i = 0;
    for(ContentTable::iterator itor=pi.gutable.begin(); itor!=pi.gutable.end(); i++, itor++){
        content_id_t *pcid = (content_id_t *)(pMsg->MsgData+sizeof(MSG_DATA_CCC_LCE_POLICY_RSP)+i*sizeof(content_id_t));
        pcid->firstBlock = itor->firstBlock;
        pcid->secondBlock = itor->secondBlock;
        pcid->thirdBlock = itor->thirdBlock;
        pcid->fourthBlock = itor->fourthBlock;
    }