From 89912ba290d06adc9abd9c94b12f4a478dce3d8b Mon Sep 17 00:00:00 2001
From: gb <741021719@qq.com>
Date: Wed, 31 May 2023 11:37:24 +0800
Subject: [PATCH] =?UTF-8?q?=E8=8E=B7=E5=8F=96=E5=BA=8F=E5=88=97=E5=8F=B7?=
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---
 hgdriver/hgdev/hg_scanner.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index 0b40386..5c576be 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -3640,6 +3640,9 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
 	}
 	else if(code == IO_CTRL_CODE_GET_SERIAL)
 	{
+		if (!is_online())
+			return SCANNER_ERR_DEVICE_NOT_FOUND;
+
 		std::string ser = get_serial_num();
 		if (*len < ser.size() + 1)
 		{