当多个设备连接到计算机时，可能会发生断开一个设备会导致另一个设备消失的情况。当您启动新应用程序以使用扫描仪时，它无法找到它。在这篇文章中，我们将分享在另一个设备断开连接后应用程序找不到新的扫描设备时的解决方案。

当您断开设备^(Devices)上的Web 服务^(Services)( WSD ) 扫描仪或将其连接到基于 Windows 的计算机或将不同的扫描设备（例如USB 扫描仪^{(USB scanner)}）连接到计算机时，可能会出现此问题。所有这些都指向状态变化。当找不到机器时，表示它仍然处于脱机状态。当操作系统查询其状态时，会收到 WIA ERROR OFFLINE错误。

WIA_ERROR_OFFLINE, The device is offline, Make sure the device is powered on and connected to the PC, Error code 0x80210005

Windows Image Acquisition ( WIA ) 使图形软件能够与扫描仪等成像硬件进行通信。当初始化过程失败时，此处会出现错误。

应用程序找不到扫描仪

大多数情况下，问题是暂时的，重新启动扫描仪和计算机可能会解决问题。以下是我们的建议：

1. 连接扫描仪时重新启动计算机
2. 卸载连接的扫描仪设备并重新连接^(Reconnect)
3. 重新启动Windows 图像采集^{(Windows Image Acquisition)}( WIA )服务^(Service)

您可能需要管理员帐户才能从设备管理器中删除设备。

1]连接扫描仪时重新启动^(Restart)计算机

它将在大多数情况下解决问题，因为状态将被重置。当设备卡在脱机模式时，扫描仪驱动程序 在调用IStiDevice::LockDevice方法时可能会遇到WIA_ERROR_OFFLINE 错误 。重新启动时，状态将重置。

2]卸载连接的扫描仪设备并重新连接^(Reconnect)

• Use WIN + X键盘快捷键打开电源^(Power)菜单，然后选择设备管理器^{(Device Manager)}。
• 找到扫描仪，右键卸载
• 重新启动计算机
• 回到您的帐户后，重新连接扫描仪。
• Windows 将再次开始检测它并安装所需的驱动程序。

3]重新启动^(Restart)Windows图像采集^{(Windows Image Acquisition)}（WIA）服务^(Service)

我们已经谈到了WIA服务，重新启动它也是一个好主意。

• 在运行^(Run)提示中，键入 services.msc 并按Enter键。
• 本地 WIA^{(Loca WIA)}服务。描述应该说，“为扫描仪和相机提供图像采集服务^{(Provides image acquisition services for scanners and cameras)}。”
• 双击打开，然后单击停止^(Stop)按钮，然后单击开始^(Start)按钮。
• 您也可以右键单击该服务，然后从上下文菜单中选择重新启动^(Restart)

提示：^{(TIP: )}这篇文章将帮助您解决扫描仪问题。^{(troubleshoot Scanner problems.)}

我希望该指南易于理解，其中一个解决方案可以解决问题——在另一个设备断开连接后，应用程序找不到新的扫描设备。

Application cannot find Scanner - WIA_ERROR_OFFLINE, 0x80210005

When multiplе devices are connected tо the computer, іt may so happen that disconnecting one makes the other one disappear.  When you start a new apрlication tо use the sсanner, it cannot find it. In this post, we will share solutions when applications do not find a new scanning device after anothеr deνice is disconnected.

The problem can occur when you disconnect a Web Services on Devices (WSD) scanner or connect it to a Windows-based computer or when you connect a different scanning device, such as a USB scanner, to the computer. All of these point to a state change. When a machine cannot be found, it means it is still offline. When the OS makes a query for its status, it will receive WIA ERROR OFFLINE error.

WIA_ERROR_OFFLINE, The device is offline, Make sure the device is powered on and connected to the PC, Error code 0x80210005

Windows Image Acquisition (WIA) enables graphics software to communicate with imaging hardware such as scanners. The error occurs here when the initialization process fails.

Application can’t find Scanner

Most of the time, the problem is temporary, and restarting both the scanner and computer may solve it. Here are our suggestions:

1. Restart the computer while the scanner is connected
2. Uninstall the connected scanner device & Reconnect
3. Restart the Windows Image Acquisition (WIA) Service

You may need an administrator account for removing devices from the device manager.

1] Restart the computer while the scanner is connected

It will resolve the problem most of the time as the state will be reset. When the device is stuck in offline mode, the scanner driver may experience a WIA_ERROR_OFFLINE error when it calls the IStiDevice::LockDevice method. When you restart, the state is reset.

2] Uninstall the connected scanner device & Reconnect

• Use WIN + X keyboard shortcut to open the Power menu, and then select Device Manager.
• Locate the scanner, right-click and uninstall
• Restart the computer
• Once you are back into your account, reconnect the scanner.
• Windows will start detecting it again and install the required drivers.

3] Restart the Windows Image Acquisition (WIA) Service

We have already talked about WIA service, and it would be a good idea to restart it too.

• In the Run prompt, type services.msc and press the Enter key.
• Loca WIA service. The description should say, “Provides image acquisition services for scanners and cameras.”
• Double click to open, and then click on the Stop button, and later on the Start button.
• You can also right-click on the service, and choose Restart from the context menu

TIP: This post will help you troubleshoot Scanner problems.

I hope the guide was easy to follow, and one of these solutions resolve the issue—Applications do not find a new scanning device after another device is disconnected.

Related posts

• 如何在Windows 10中排除Microsoft Safety Scanner错误

• Windows无法启动; Hardware or software change可能是原因

• Scanner问题，故障排除提示和解决方案

• Scanner无法在Windows上工作; Problem连接到扫描仪

• Windows无法验证数字签名（Code 52）

• System error 6118，此工作组的服务器列表不可用

• 该operating system无法启动，因为system driver错误

• 在需要的地方安装Windows驱动器上Additional自由空间

• 如何在Windows 10修复Disk Signature Collision problem

• SFC未能Repair and DISM演出error 0x800f081f在Windows 10

• Fix Bdeunlock.exe Bad image，System Error或不响应错误

• Fix Package无法在Windows 11/10上注册

• Fix Logitech Setpoint Runtime error在Windows 10上

• Fix Error 0xC00D3E8E，该物业在Windows 11/10只读

• 错误0x80073D26,0x8007139F或0x00000001游戏service error

• 将属性应用于Windows 10中的文件时发生错误

• Fix Microsoft Store在Windows 11/10上登录error 0x801901f4

• 在Windows 11/10 Fix Explorer.exe application错误

• Please插入外部存储介质和press OK

• Fix OOBEKEYBOARD，OOBELOCAL，在Windows OOBEREGION错误