#define MAX_STR 255
wchar_t wstr[MAX_STR];             // !!! <----- wstr[255]; 0~254;

// Read the Manufacturer String
wstr[0] = 0x0000;
res = hid_get_manufacturer_string(handle, wstr, MAX_STR);

int HID_API_EXPORT_CALL HID_API_CALL hid_get_product_string(hid_device *dev, wchar_t *string, size_t maxlen)
{
	if (!dev->device_info)
	{
		register_string_error(dev, L"NULL device/info");
		return -1;
	}

	if (!string || !maxlen)
	{
		register_string_error(dev, L"Zero buffer/length");
		return -1;
	}


	wcsncpy(string, dev->device_info->product_string, maxlen);
	string[maxlen] = L'\0';      // !!! <----- string[255] = L'\0'; boom!
        // fixed: string[maxlen - 1] = L'\0';

	return 0;
}