使用WinUSB检测USB设备是什么设备速率？高速、低速、全速

WinUSB提供了检测USB设备的速率代码，详见：

// Device Information types
#define DEVICE_SPEED            0x01

// Device Speeds
#define LowSpeed                0x01
#define FullSpeed               0x02
#define HighSpeed               0x03 


BOOL GetUSBDeviceSpeed(WINUSB_INTERFACE_HANDLE hDeviceHandle, UCHAR* pDeviceSpeed)
{
    if (!pDeviceSpeed || hDeviceHandle == INVALID_HANDLE_VALUE)
    {
        return FALSE;
    }

    BOOL bResult = TRUE;

    ULONG length = sizeof(UCHAR);

    bResult = WinUsb_QueryDeviceInformation(hDeviceHandle, DEVICE_SPEED, &length, pDeviceSpeed);
    if (!bResult)
    {
        printf("Error getting device speed: %d.\n", GetLastError());
        goto done;
    }

    if (*pDeviceSpeed == LowSpeed)
    {
        printf("Device speed: %d (Low speed).\n", *pDeviceSpeed);
        goto done;
    }
    if (*pDeviceSpeed == FullSpeed)
    {
        printf("Device speed: %d (Full speed).\n", *pDeviceSpeed);
        goto done;
    }
    if (*pDeviceSpeed == HighSpeed)
    {
        printf("Device speed: %d (High speed).\n", *pDeviceSpeed);
        goto done;
    }

done:
    return bResult;
}

调用函数代码：

     DEVICE_DATA           deviceData;
     BOOL    noDevice;
     hr = OpenDevice(&deviceData, &noDevice);

    UCHAR speed = 0;
    if(GetUSBDeviceSpeed(deviceData.WinusbHandle, &speed))
    {
        printf("speed =%d\n", speed);
    }
    ...
    CloseDevice(&deviceData);

参考资料：

• 怎么更专业的区分USB2.0设备工作在高速还是全速态？http://www.usbzh.com/zone/detail-41.html