Unable to connnect USB in UWP C++WinRT but it is able in UWP C# [FromIdAsync]

DaloDalo 1

Hi, There,

I'm try to open the usb device. I refenced CustomDusbDevicessAccess in windows-universal-samples.
When I using C#, It is Ok to open the USB. But When I using C++WinRT, It did'nt open.

In C++WinRT UWP,
device = co_await Windows::Devices::Usb::UsbDevice::FromIdAsync(L"\\?\USB#VID_1CBE&PID_0003#12345678#{dee824ef-729b-4a0e-9c14-b7117d33a817}");
is fail.

But in C# UWP,
device = await UsbDevice.FromIdAsync("\\?\USB#VID_1CBE&PID_0003#12345678#{dee824ef-729b-4a0e-9c14-b7117d33a817}");
is success.

plz. help..

Fay Wang - MSFT 5,196 Reputation points

2020-06-04T07:12:56.027+00:00

When you used the above code in c++/winrt, did you receive any exception or it just return null? If you received an exception, can you show more details about the error?
DaloDalo 1 Reputation point

2020-06-04T09:53:12.84+00:00

It just return null.
It doesn't generate any exceptions.
Fay Wang - MSFT 5,196 Reputation points

2020-06-05T09:00:52.183+00:00

Does this issue only occur on one device? If you change another device, will the same issue occur? In addition, please check whether the USB device capabilities you declared is correct in the manifest and can you provide a simple sample that can be reproduced for us to test?

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Unable to connnect USB in UWP C++WinRT but it is able in UWP C# [FromIdAsync]