c# - 尝试使用 wpf 连接到扫描仪时出现错误代码

Question

我正在使用 WIA 连接到扫描仪。我枚举设备信息，然后尝试连接到设备。我不断收到异常。

HRESULT 异常:0x80210006

我在 WPF 窗口的代码后面调用代码。

        DeviceManager manager = new DeviceManagerClass();
        DeviceInfo device = null;
        foreach (DeviceInfo deviceInfo  in manager.DeviceInfos)
        {
            var ID = deviceInfo.DeviceID;
            var props = deviceInfo.Properties ;
            foreach (Property property in props)
            {
                var name = property.Name;
                var descr = property.get_Value() as string;
            }
            var type = deviceInfo.Type;
            if (type == WiaDeviceType.ScannerDeviceType)
                device = deviceInfo;
        }
        if (device != null)
              device.Connect();

我不明白为什么会这样。任何帮助将不胜感激。

Answer 1

HRESULT:0x80210006 是 WIA_ERROR_BUSY。

来自WIA API Error Codes page :

WIA_ERROR_BUSY        The WIA device is busy.

根据 Communicating with a WIA Device in Multiple Threads or Applications ，看起来其他东西可能正在访问该设备:

If a thread currently has a device locked (it is actively communicating with that device) and another thread attempts to call a method that actively communicates with the device, the method returns a WIA_ERROR_BUSY error.