我创建了一个观察者来连接BarcodeScanner
使用Windows.Devices.PointOfService
var watcher = DeviceInformation.CreateWatcher(BarcodeScanner.GetDeviceSelector());
var id = "";
watcher.Added += async (sender, information) =>
{
id = information.Id;
var barcodeScanner = await BarcodeScanner.FromIdAsync(id);
...
}
信息参数包含与我的barcodeScanner相关的所有数据,但是当我尝试获取它时FromIdAsync
始终为空。这些是包含在信息中的数据
- information {Windows.Devices.Enumeration.DeviceInformation} Windows.Devices.Enumeration.DeviceInformation
EnclosureLocation null Windows.Devices.Enumeration.EnclosureLocation
Id "\\\\?\\HID#VID_0536&PID_02E1&MI_01#c&d907bf5&0&0000#{c243ffbd-3afc-45e9-b3d3-2ba18bc7ebc5}\\POSBarcodeScanner" string
IsDefault false bool
IsEnabled true bool
Kind DeviceInterface Windows.Devices.Enumeration.DeviceInformationKind
Name "3800G" string
+ Pairing {Windows.Devices.Enumeration.DeviceInformationPairing} Windows.Devices.Enumeration.DeviceInformationPairing
+ Properties {System.__ComObject} System.Collections.Generic.IReadOnlyDictionary<string, object> {System.__ComObject}
+ Native View 0x1d148140 <Information not available, no symbols loaded for Windows.Devices.Enumeration.dll> IUnknown *
此设备被列为已启用,可通过 POS 访问。
我哪里错了?我还尝试在单击按钮后创建观察者,但没有任何变化。