This example adds details data for the Car object by appending FIELDINFO structures to *ppClassFieldInfo.

SOM_Scope ULONG SOMLINK carM_wpclsQueryDetailsInfo(M_Car *somSelf,
                PCLASSFIELDINFO *ppClassFieldInfo,
                PULONG pSize)
{
 ULONG           cParentCol;
 PCLASSFIELDINFO pCFI;
 ULONG           i;

    /* M_CarData *somThis = M_CarGetData(somSelf); */
    M_CarMethodDebug("M_Car","carM_wpclsQueryDetailsInfo");

   /*  Always call the parent method first to retrieve the number of
       details columns and any data already defined in the details buffer. */

   cParentCol = parent_wpclsQueryDetailsInfo(somSelf, ppClassFieldInfo, pSize);

        /* If details columns exist, add the size of ours to it */

   if (pSize)
      *pSize += sizeof(CARDETAILS);

   /*   If the request was for the chained fieldinfo structures
    *   (ppClassFieldInfo is non-NULL), link them in
    *
    *   eventually the chain will look like
    *
    *   Grandad - Dad - Me - Kid - Grandkid
    *
    *   I will be getting the pointer to the beginning of the chain
    *
    *   If the beginning of the chain is 0, I will assign the address
    *   of my first CLASSFIELDINFO structure to *ppClassFieldInfo.
    *   Otherwise *pp points to the first column description in the
    *   chain.  We need to walk the chain and link our CLASSFIELDINFO
    *   structures at the end.
    */

   if (ppClassFieldInfo) {

      if (*ppClassFieldInfo) {
         pCFI = *ppClassFieldInfo;
         for (i=0;i<cParentColumns;i++)
            pCFI = (pCFI->pNextFieldInfo) ? pCFI->pNextFieldInfo : pCFI;

         pCFI->pNextFieldInfo = fieldinfo;
      } else {
         *ppClassFieldInfo = fieldinfo;
      } /* endif */

   } /* endif */

   return ((ULONG) (cParentColumns + NUM_CAR_FIELDS));
}