无法在UWP中使用HIDDevice类打开设备的句柄 [英] Can't open a handle to a device using HIDDevice class in UWP

问题描述

我们的应用程序，名为Hellokey，已在Store上提供，它可作为Windows Hello的配套设备管理器。

我们用于打开我们的句柄的函数HID设备如下，在某些Windows 10系统上不起作用。

 string selector = HidDevice.GetDeviceSelector（0x0f0b，0x0001）; 
 
 var devices = await DeviceInformation.FindAllAsync（selector）; 
 if（devices.Count> 0）
 {
 currentDevice = await HidDevice.FromIdAsync（devices.ElementAt（0）.Id，
 FileAccessMode.ReadWrite）; 
} 

它返回的错误提到设备正忙，但同时使用使用.NETFramework API的WPF应用程序我可以打开并运行HID设备。

我遇到的唯一解决方案是重新安装或使用'Fresh'选项，我必须完全删除所有已安装的应用程序。

你能否帮助找到问题的根源HIDDevice真的不稳定。

解决方案

Hi
Hassan Seifi，

>>我们用于打开HID设备句柄的功能如下所示，这对某些Windows
10系统无效。

在那些API不起作用的情况下，是否有从应用程序显示的同意提示？

当商店应用程序第一次调用该方法时，应该调用它来自UI线程。 在
中提到了官方文件的评论 HidDevice.FromIdAsync（） 。

您是否确保首次从UI线程调用此函数？

您可以使用以下代码来确保从UI线程调用它：

 await Dispatcher.RunAsync（Windows.UI.Core.CoreDispatcherPriority.Normal，（）=> {
 
 currentDevice = await HidDevice.FromIdAsync（devices.ElementAt（0）.Id，
 
 FileAccessMode.ReadWrite）; 
 
}）; 

< span style ="font-size：9.5pt; font-family：Consolas">

最好的问候，

Roy

Our application, named Hellokey, is already available on Store which works as a manager of companion device for Windows Hello.

The function we use for opening a handle to our HID device is as follow which doesn't works on some windows 10 systems.

string selector = HidDevice.GetDeviceSelector(0x0f0b, 0x0001);

var devices = await DeviceInformation.FindAllAsync(selector);
if (devices.Count > 0)
{
       currentDevice = await HidDevice.FromIdAsync(devices.ElementAt(0).Id,
                                   FileAccessMode.ReadWrite);
}

The error it returns mentioning that the device is busy, but at the same time using WPF application which uses .NETFramework API I can open and work the HID device.

The only solution I have for this issue is reinstalling or using the 'Fresh' option where I have to remove all the installed application entirely.

Could you please help with finding the source of the problem HIDDevice is really unstable.

解决方案

Hi Hassan Seifi,

>> The function we use for opening a handle to our HID device is as follow which doesn't works on some windows 10 systems.

In those occasions that the API doesn’t work, is there a consent prompt that shows from the app?

When the store app invokes the method for the first time, it should be called from a UI thread.  This is mentioned in the remarks of the official document HidDevice.FromIdAsync().

Have you ensured this function is called from a UI thread for the first time?

You could use the following code to mark sure it is called from the UI thread:

         await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () => {

                currentDevice = await HidDevice.FromIdAsync(devices.ElementAt(0).Id,

                               FileAccessMode.ReadWrite);

            });

Best regards,

Roy

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