微过滤驱动FilterConnectCommunicationPort连接不上

[zgyod]

#include "stdafx.h"
#include <Windows.h>
#include <FltUser.h>
#pragma comment(lib, "fltLib.lib")

#define FmPortName L"\\FmPort"
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HANDLE port;
HRESULT hr;
hr = FilterConnectCommunicationPort( FmPortName,
0,
NULL,
0,
NULL,
&port );
int result = MessageBox(NULL,TEXT("这是对话框"),TEXT("你好"),MB_ICONINFORMATION|MB_YESNO);
return 0;
}

VC6 编译通过,运行到 hr = FilterConnectCommunicationPort( FmPortName,这行卡住了 ,系统不能动,