写驱动时，想得到hid设备的属性时却得不到？是IOCTL_HID_GET_COLLECTION_INFORMATION用的不得当么？

代码如下：

HID_COLLECTION_INFORMATION HidCi;
IO_STATUS_BLOCK IoStatus;
KEVENT event;

// Initialise IRP completion event
KeInitializeEvent(&event, NotificationEvent, FALSE);

// Build Internal IOCTL IRP
PIRP Irp = IoBuildDeviceIoControlRequest(
IOCTL_HID_GET_COLLECTION_INFORMATION, HidDevice,
NULL, 0, // Input buffer
&HidCi, sizeof(HidCi), // Output buffer
TRUE, &event, &IoStatus);

DebugPrint(\"HID attributes: VendorID=%4x, ProductID=%4x, VersionNumber=%4x\",
HidCi.VendorID, HidCi.ProductID, HidCi.VersionNumber);



// Call the driver and wait for completion if necessary
NTSTATUS status = IoCallDriver( HidDevice, Irp);

其中HidDevice是HID设备的句柄。

DebugPrint输出的数据是错误的。为什么？
在驱动中应该怎样做呢？