加入的DbgPrint总是不起作用？！

我在xpassthru程序里加入了DbgPrint(),但是用dbgview察看的时候总是没有结果输出，很纳闷
NDIS_STATUS
PtReceive(
IN  NDIS_HANDLE ProtocolBindingContext,
IN  NDIS_HANDLE MacReceiveContext,
IN  PVOID HeaderBuffer,
IN  UINT HeaderBufferSize,
IN  PVOID LookAheadBuffer,
IN  UINT LookAheadBufferSize,
IN  UINT PacketSize
)
{
PADAPT pAdapt =(PADAPT)ProtocolBindingContext;
PNDIS_PACKET Packet;//MyPacket,
NDIS_STATUS Status = NDIS_STATUS_SUCCESS;

DBGPRINT(\"==> Passthru Protocol PtReceive\\n\");
DbgPrint(\"    CurrentAdapterHandle: %u\\n\", ProtocolBindingContext);
DbgPrint(\"    MacReceiveHandle: %u\\n\", MacReceiveContext);
DbgPrint(\"    HeaderBufferPointer: %u\\n\", HeaderBuffer);
DbgPrint(\"    HeaderBufferSize: %u\\n\", HeaderBufferSize);
DbgPrint(\"    LookAheadBufferPointer: %u\\n\", LookAheadBuffer);
DbgPrint(\"    LookAheadBufferSize: %u\\n\", LookAheadBufferSize);
DbgPrint(\"    PacketSize: %u\\n\", PacketSize);
DbgPrint(\"    Add DbgPrint:%u\\n\",0);//这一句为加入代码

前面的DbgPrint()代码都能够输出，就是最后一句加入的没有输出结果，不解，请大家帮个忙！！！

没用，加进去的DbgPrint()代码总是不起作用。
我是把xpassthru安装起来的