PRSVD的作用？

下面是斑竹以前发的帖子里，我对里面的“Resvd =(PRSVD)(MyPacket->MiniportReserved);Resvd->OriginalPkt = NULL;”代码的意思不了解，希望大虾指点一下！

{
Status = NdisAllocateMemory(
&pPacketContent,
2000,
0,
HighestAcceptableAddress);

if (Status != NDIS_STATUS_SUCCESS )
{
DbgPrint(\"ptreceive :ndisallocatememory failed\\n\");
return NDIS_STATUS_NOT_ACCEPTED ;
}

if(pPacketContent == NULL)
{
DbgPrint(\"prreceive:pPacketContent == NULL\\n\");
return NDIS_STATUS_NOT_ACCEPTED ;
}

RtlZeroMemory(pPacketContent, 2000 );

RtlCopyMemory(pPacketContent,HeaderBuffer,HeaderBufferSize);
RtlCopyMemory(pPacketContent+HeaderBufferSize,LookAheadBuffer,LookAheadBufferSize);
PacketLen = PacketSize+HeaderBufferSize;

// DbgPrint(\"Packet Size=%d\\n\",PacketLen);

result = RecvProcess( pAdapt,pPacketContent,&PacketLen);
if( result == PACKET_REFUSE )
{
DbgPrint(\"ptreceive :packet_refuse\\n\");
NdisFreeMemory(pPacketContent,2000,0);
return NDIS_STATUS_NOT_ACCEPTED;
}
NdisDprAllocatePacket(&Status,
&MyPacket,
pAdapt->RecvPacketPoolHandle);

if(Status == NDIS_STATUS_SUCCESS)
{
NdisAllocateBuffer(&Status,&PacketBuffer,pAdapt->RecvBufferPoolHandle,pPacketContent,PacketLen);
NdisChainBufferAtFront( MyPacket, PacketBuffer );
MyPacket->Private.Head->Next=NULL;
MyPacket->Private.Tail=NULL;
Resvd =(PRSVD)(MyPacket->MiniportReserved);
Resvd->OriginalPkt = NULL;
NDIS_SET_PACKET_HEADER_SIZE( MyPacket, HeaderBufferSize );
NdisMIndicateReceivePacket(pAdapt->MiniportHandle, &MyPacket, 1); // 这个函数调用之后ndis就只能调用protocol的ptrecievepacket了。

if ( NDIS_GET_PACKET_STATUS( MyPacket ) != NDIS_STATUS_PENDING )
{
NdisFreeBuffer(PacketBuffer);
NdisFreeMemory(pPacketContent,2000,0);
NdisDprFreePacket(MyPacket);
}
break;
}

怎么浏览后直接发表文章，问题分数为0分？一定要退回去才能有分数吗？

在\"ndis.h\"头文件里有

我装的是Win2k DDK，在目录D:\\NTDDK\\inc\\ddk下
自己直接搜索ndis.h就可以找到了