DeviceIoControl for SCSI查询命令返回错误50

我试图通过IOCTL命令访问USB扫描仪。这是在Windows 7上。我以前没有处理过IOCTL编码，所以我首先尝试了下面的代码片段，基于我可以通过快速搜索找到的内容。

#include "stdafx.h"
#include <stddef.h>
#include <Windows.h>
#include <ntddscsi.h>
#include <usbscan.h>
typedef struct
{
    SCSI_PASS_THROUGH spt;
    BYTE sense[18];
    BYTE data[36];
} SPTSD;
LPTSTR ErrorMessage(DWORD error)
{
    LPTSTR errorText = NULL;
    FormatMessage(
       FORMAT_MESSAGE_FROM_SYSTEM
       |FORMAT_MESSAGE_ALLOCATE_BUFFER
       |FORMAT_MESSAGE_IGNORE_INSERTS,  
       NULL,
       error,
       MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
       (LPTSTR)&errorText,
       0, 
       NULL);
    return errorText;
}
int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE h = CreateFile(L"\\.\Usbscan0", GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (INVALID_HANDLE_VALUE != h)
    {
        SPTSD sptsd={0};
        sptsd.spt.Length = sizeof (sptsd.spt);
        sptsd.spt.SenseInfoLength = sizeof(sptsd.sense);
        sptsd.spt.DataTransferLength = sizeof(sptsd.data);
        sptsd.spt.SenseInfoOffset = offsetof (SPTSD, sense);
        sptsd.spt.DataBufferOffset = offsetof (SPTSD, data);
        sptsd.spt.TimeOutValue = 30;
        sptsd.spt.DataIn = SCSI_IOCTL_DATA_IN;
        sptsd.spt.CdbLength = 6;
        sptsd.spt.Cdb[0] = 0x12; // SCSI INQUIRY command
        sptsd.spt.Cdb[1] = 0;
        sptsd.spt.Cdb[2] = 0;
        sptsd.spt.Cdb[3] = 0;
        sptsd.spt.Cdb[4] = sizeof(sptsd.data);
        sptsd.spt.Cdb[5] = 0;
        DWORD dwReturnedBytes;
        BOOL b;
        b = DeviceIoControl(h, IOCTL_SCSI_PASS_THROUGH, &sptsd, sizeof(sptsd), &sptsd, sizeof(sptsd), &dwReturnedBytes, NULL);
        if (b == 0)
        {
            LPTSTR errortext = ErrorMessage(GetLastError());
            wprintf(L"DeviceIoControl(IOCTL_SCSI_PASS_THROUGH-INQUIRY) failed with error %d : %srn", GetLastError(), errortext);
            LocalFree(errortext);
        }
        else
        {
            wprintf(L"DeviceIoControl(IOCTL_SCSI_PASS_THROUGH-INQUIRY) succeededrn");
            for (int i=0; i<dwReturnedBytes; i++)
            {
                wprintf(L"%02x ", sptsd.data[i]);
            }
            wprintf(L"rnEnd of returned datarn");
        }
        DEVICE_DESCRIPTOR dd;
        b = DeviceIoControl(h, IOCTL_GET_DEVICE_DESCRIPTOR, &dd, sizeof(dd), &dd, sizeof(dd), &dwReturnedBytes, NULL);
        if (b == 0)
        {
            LPTSTR errortext = ErrorMessage(GetLastError());
            wprintf(L"DeviceIoControl(IOCTL_GET_DEVICE_DESCRIPTOR) failed with error %d : %srn", GetLastError(), errortext);
            LocalFree(errortext);
        }
        else
        {
            wprintf(L"DeviceIoControl(IOCTL_GET_DEVICE_DESCRIPTOR) succeededrn");
            wprintf(L"VendorId = %x, ProductId = %x, Version = %xrn", dd.usVendorId, dd.usProductId, dd.usBcdDevice);
            wprintf(L"End of returned datarn");
        }
        CloseHandle(h);
    }
    return 0;
}

我尝试了32位和64位版本的Windows 7，但两者的结果都是相同的(错误50:不支持请求。)有趣的是，第二个DeviceIoControl调用工作并返回设备的VID/PID，以及固件版本。

根据错误信息，我认为这个IOCTL是不支持的。然而，我调查了一下，发现这个IOCTL代码对所有设备都是强制性的，所以一定是我做错了什么。如何修改此代码以使INQUIRY命令成功执行?