我在做文件读取拦截时出现蓝屏？代码如下

我在做文件读取拦截时出现蓝屏，代码如下：
ppIFSFileHookFunc PrevHook;

PUCHAR Aa1Device::ConvertPath( int drive, path_t ppath, PUCHAR fullpathname )
{
int i = 0;
_QWORD result;
if( drive != 0xFF ) {
fullpathname[0] = drive+\'A\'-1;
fullpathname[1] = \':\';
i = 2;
}
UniToBCSPath( &fullpathname, ppath->pp_elements, 260 , BCS_WANSI, &result );
return( fullpathname );
}

int _cdecl MyIfsHook(pIFSFunc pfn, int fn, int Drive, int ResType,
int CodePage, pioreq pir)
{
int retvar,i;
unsigned char fullpathname[260];
switch(fn)
{
case IFSFN_READ:
{
retvar=(*PrevHook)(pfn, fn, Drive, ResType, CodePage, pir);
Aa1Device::ConvertPath( Drive, pir->ir_ppath, fullpathname );
return TRUE;//retvar;
}
default:
return (*PrevHook)(pfn, fn, Drive, ResType, CodePage, pir);
}
}

BOOL Aa1Device::OnSysDynamicDeviceInit()
{
PrevHook = IFSMgr_InstallFileSystemApiHook(MyIfsHook);
if (PrevHook==NULL)
       return FALSE;
else
 return TRUE;
}

BOOL Aa1Device::OnSysDynamicDeviceExit()
{
IFSMgr_RemoveFileSystemApiHook(MyIfsHook);
return TRUE;
}

DWORD Aa1Device::OnW32DeviceIoControl(PIOCTLPARAMS pDIOCParams)
{
return 0;
}



ring3代码如下：
handle=::CreateFile(\"\\\\\\\\.\\\\aa1.vxd\",0,0,0,CREATE_NEW,FILE_FLAG_DELETE_ON_CLOSE,NULL);
if (handle==INVALID_HANDLE_VALUE)
AfxMessageBox(\"error\");

求路径时出错了
读和写的时候不能直接用这个办法
给你一个非常有名的程序，虽然有点繁琐，不过还可以。
98是用Vtoolsd开发的