<UU_RRC_CONN_SETUP_CMP_UNION type="union">
   <sRrcConnSetupCmpR8 type="struct">
      <ucSelectedPlmnId type="UINT8">1</ucSelectedPlmnId >
      <bIsRegisteredMmePresent type="UINT8">2</bIsRegisteredMmePresent>

      <sRegisteredMme type="struct">
         <sMcc type="struct">
            <aucItem arraylength="3" type="UINT8">333</aucItem>
         </sMcc>

         <sMnc type="struct">
            <ucCnt type="UINT8">4</ucCnt>
            <aucItem arraylength="3" type="UINT8">123</aucItem>
         </sMnc>

         <sMmeGropuId type="struct">
            <aucItem arraylength="2" type="UINT8">34</aucItem>
         </sMmeGropuId>

         <sMmeCode type="struct">
            <aucItem arraylength="1" type="UINT8">5</aucItem>
         </sMmeCode>
      </sRegisteredMme>

      <sNasDedicatedInfo type="struct">
         <usCnt type="UINT16">24</usCnt>
         <aucItem arraylength="4095" type="UINT8">1234567890</aucItem>
      </sNasDedicatedInfo>
   </sRrcConnSetupCmpR8>

   <sCriticalExt type="UINT8"/>
</UU_RRC_CONN_SETUP_CMP_UNION>
把它转成数据结构的形式：
type
union
UU_RRC_CONN_SETUP_CMP_UNION
type
struct
type
UINT8
1
type
UINT8
2
type
struct
type
struct
arraylength
3
type
UINT8
333
type
struct
type
UINT8
123
type
struct
…………
type
UINT8
并写进BUFFER,如何操作实现,还有就是对子节点是如何遍历的用C或者是C++