C++/Is Usb Device

BOOL IsUsbDevice(TCHAR letter)
{
	TCHAR volumeAccessPath[] = _T("\\\\.\\X:");
	volumeAccessPath[4] = letter;

HANDLE deviceHandle = CreateFile(
		volumeAccessPath,
		0,                // no access to the drive
		FILE_SHARE_READ | // share mode
		FILE_SHARE_WRITE,
		NULL,             // default security attributes
		OPEN_EXISTING,    // disposition
		0,                // file attributes
		NULL);            // do not copy file attributes

// setup query
	STORAGE_PROPERTY_QUERY query;
	memset(&query, 0, sizeof(query));
	query.PropertyId = StorageDeviceProperty;
	query.QueryType = PropertyStandardQuery;

// issue query
	DWORD bytes;
	STORAGE_DEVICE_DESCRIPTOR devd;
	STORAGE_BUS_TYPE busType = BusTypeUnknown;

if (DeviceIoControl(deviceHandle,
		IOCTL_STORAGE_QUERY_PROPERTY,
		&query, sizeof(query),
		&devd, sizeof(devd),
		&bytes, NULL))
	{
		busType = devd.BusType;
	}
	else
	{
		//std::wcout << L"Failed to define bus type for: " << letter;
	}

CloseHandle(deviceHandle);

return BusTypeUsb == busType;
}

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