关于在是sfilter中获得文件全路径的问题！！！

status = IoCallDriver( ((PSFILTER_DEVICE_EXTENSION) DeviceObject->DeviceExtension)->AttachedToDeviceObject, Irp );

//
// Wait for the completion routine to be called
//
if (STATUS_PENDING == status)
{

NTSTATUS localStatus = KeWaitForSingleObject(&waitEvent, Executive, KernelMode, FALSE, NULL);
ASSERT(STATUS_SUCCESS == localStatus);


}else if (NT_SUCCESS(status))
{
irpSp = IoGetCurrentIrpStackLocation(Irp);
file_obj = irpSp->FileObject;
if(file_obj!=NULL && (irpSp->Parameters.Create.Options & FILE_DIRECTORY_FILE)!=0)
{//文件是目录
//判断新建还是打开
CreateDisposition = (irpSp->Parameters.Create.Options >> 24) & 0x000000ff;
if (CreateDisposition == FILE_CREATE)
{

//获得文件全路径
UCHAR buf[64] = {0};
PUCHAR new_buf = NULL;
ULONG length = 64, ret_length;
POBJECT_NAME_INFORMATION name_infor = (POBJECT_NAME_INFORMATION)buf;
NTSTATUS statusOfGetPath;
UCHAR ansi_buf = NULL;
PANSI_STRING pansi_string = NULL;

RtlUnicodeStringToAnsiString(pansi_string, &file_obj->FileName, FALSE);

statusOfGetPath = ObQueryNameString(file_obj, name_infor, length, &ret_length);
if (statusOfGetPath == STATUS_INFO_LENGTH_MISMATCH)
{
new_buf = ExAllocatePool(NonPagedPool, ret_length);
if (new_buf == NULL)
{
KdPrint(("mem not enough\r\n"));
}else{
name_infor = (POBJECT_NAME_INFORMATION)new_buf;
statusOfGetPath = ObQueryNameString(file_obj, name_infor, length, &ret_length);
if (NT_SUCCESS(statusOfGetPath))
{
KdPrint(("dir file path : %wZ", &name_infor->Name)); //希望在此处打印文件全路径......
}
}
}
if(new_buf != NULL)
{
ExFreePool(new_buf);
}


}else{
KdPrint(("open exist dir file : %ws\r\n", &file_obj->FileName));
}

}
}