关于在passthru中的数据包转发的问题！！

我在passthru里编了一个数据包的转发，如下代码加在ptreceive()内：

PUCHAR          pPacketContent;
UINT            PacketLen;

UINT            FLAGS;
CHAR            ExchangeContent;
    INT             iExchange;
Status=NdisAllocateMemory(&pPacketContent,2000,0,HighestAcceptableMax);
if (Status!=NDIS_STATUS_SUCCESS)
{
DbgPrint(\"ptreceive: ndisallocatememory failed\\n\");
return NDIS_STATUS_NOT_ACCEPTED;
}
if (pPacketContent==NULL)
{
DbgPrint(\"ptreceive: pPacketContent==NULL\\n\");
return NDIS_STATUS_NOT_ACCEPTED;
}
DbgPrint(\"ptreceive: I LIKE PASSTHRU!\\n\");
RtlZeroMemory(pPacketContent,2000);
RtlCopyMemory(pPacketContent,HeaderBuffer,HeaderBufferSize);
RtlCopyMemory(pPacketContent+HeaderBufferSize,LookAheadBuffer,LookAheadBufferSize);
PacketLen=HeaderBufferSize+LookAheadBufferSize;
DbgPrint(\"PacketLen:%u\\n\",PacketLen);
if (((CHAR *)pPacketContent)[12]==8&&
((CHAR *)pPacketContent)[13]==0&&
((CHAR *)pPacketContent)[23]==17)
{
DbgPrint(\"UDP包被成功拦截！！\\n\");
pAdapt = pAdapt->pSecondaryAdapt;

//交换MAC地址
for (iExchange=0;iExchange<=5;iExchange++)
{
ExchangeContent = ((CHAR *)pPacketContent)[iExchange];
((CHAR *)pPacketContent)[iExchange] = ((CHAR *)pPacketContent)[iExchange+6];
((CHAR *)pPacketContent)[iExchange+6] = ExchangeContent;
}

//交换IP地址
for (iExchange=26;iExchange<=29;iExchange++)
{
ExchangeContent = ((CHAR *)pPacketContent)[iExchange];
((CHAR *)pPacketContent)[iExchange] = ((CHAR *)pPacketContent)[iExchange+4];
((CHAR *)pPacketContent)[iExchange+4] = ExchangeContent;
}

//交换端口号
for (iExchange=34;iExchange<=35;iExchange++)
{
ExchangeContent = ((CHAR *)pPacketContent)[iExchange];
((CHAR *)pPacketContent)[iExchange] = ((CHAR *)pPacketContent)[iExchange+2];
((CHAR *)pPacketContent)[iExchange+2] = ExchangeContent;
}
MyPacket=(PNDIS_PACKET)pPacketContent;
FLAGS = NdisGetPacketFlags(MyPacket);
Status=MPSend(pAdapt,MyPacket,FLAGS);
if (Status!=NDIS_STATUS_SUCCESS)
{
DbgPrint(\"UDP数据包转发不成功！\");
return NDIS_STATUS_NOT_ACCEPTED;
}
DbgPrint(\"UDP数据包转发成功！\");
NdisFreeMemory(pPacketContent,2000,0);
NdisDprFreePacket(MyPacket);
return NDIS_STATUS_NOT_ACCEPTED;
}

我安装完后就蓝屏了，希望大虾给我指点迷津，使那个地方出错了
我现在只会用DDK里的free build environment检查编程的错误，又没有别的方法检测程序的非与发行错误。

ndissend发送的数据包要不要把mac帧的14个字节的首部放在上面？