【紧急求助】Win2000 DDK问题：如何使用IOCTL_READ_REGISTERS和IOCTL_WRITE_REGISTERS操作USB设备的寄存器？

Win2000 DDK问题：如何使用IOCTL_READ_REGISTERS和IOCTL_WRITE_REGISTERS操作USB设备的寄存器？
我在对USB接口的扫描仪编程。接口芯片为LM9831，使用usbscan.sys作为内核WDM驱动。
关于IO_BLOCK结构的意义我还不甚理解。请各位大侠指教。比如，要想向地址为0x07的寄存器赋值0x20，是这样填写IO_BLOCK吗：

UCHAR pbyData[1];
pbyData[0] = 0x20;
IoBlock.uOffset = 0x07;
IoBlock.uLength = 1;
IoBlock.pbyData = pbyData;


DDK帮助文档关于IOCTL_WRITE_REGISTERS有如下使用样例:

Code Example
DWORD             cbRet;
BOOL              bRet;
IO_BLOCK          IoBlock;
OVERLAPPED        overlapped;

IoBlock.uOffset = (BYTE)byOffset;
IoBlock.uLength = (BYTE)byNbOfReg;
IoBlock.pbyData = pbyData;

memset(&overlapped, 0, sizeof(OVERLAPPED));
overlapped.hEvent = CreateEvent(
        NULL,         // pointer to security attributes
                      // WIN95 ignores this parameter
        FALSE,        // automatic reset
        FALSE,        // initialize to not signaled
        NULL);        // pointer to the event-object name

bRet = DeviceIoControl(  DeviceHandle,
                         (DWORD) IOCTL_WRITE_REGISTERS,
                         &IoBlock,
                         sizeof(IO_BLOCK),
                         NULL,
                         0,
                         &cbRet,
                         &overlapped);

if( bRet == TRUE )
{
    WaitForSingleObject(overlapped.hEvent, INFINITE);
    // we do not the test, the result is zero
}

CloseHandle(overlapped.hEvent);

应该不可以这样操作的

USB驱动中只能通过pipe来通信

寄存器是由firmware来操作的

在2000DDK中对usbscan.sys接口声明如下usbscan.h,
其中的IOCTL_READ_REGISTERS和IOCTL_WRITE_REGISTERS该如何使用呢？
/*++

Copyright (C) 1997, Logitech Inc.

Module Name:
    UsbScan.h

Abstract:
    Interface with UsbScan kernel driver

Environment:
    User and kernel mode use

Notes:
    Interface definition for USB still image driver.

--*/

……

#define FILE_DEVICE_USB_SCAN    0x8000
#define IOCTL_INDEX             0x0800

#define IOCTL_GET_VERSION               CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX,   METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_CANCEL_IO                 CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+1, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_WAIT_ON_DEVICE_EVENT      CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+2, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_READ_REGISTERS            CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+3, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_WRITE_REGISTERS           CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+4, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_GET_CHANNEL_ALIGN_RQST    CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+5, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_GET_DEVICE_DESCRIPTOR     CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+6, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_RESET_PIPE                CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+7, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_GET_USB_DESCRIPTOR        CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+8, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_SEND_USB_REQUEST          CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+9, METHOD_BUFFERED,FILE_ANY_ACCESS)
#define IOCTL_GET_PIPE_CONFIGURATION    CTL_CODE(FILE_DEVICE_USB_SCAN,IOCTL_INDEX+10,METHOD_BUFFERED,FILE_ANY_ACCESS)

mark

谁有这方面的资料？