CODEWITHSUNDEEP
c#windowsiotdragonboard
Tim Wensky
Tim Wensky

Reputation: 134

StorageDevice.FromId throwing "Not Implemented Exception" on Windows 10 IoT

I am developing a customer specific application using Windows 10 IoT on a DragonBoard 410c. In this application it is essential to know which drive is the SD card and which one is an additional USB stick. I used to handle this through the drive letters using

KnownFolders.RemovableDevices

since the SD card is supposed to have the drive letter "D". On one board, though, the SD card suddenly had the drive letter "E" and my code failed.

Therefore I started using

var deviceInfos = await DeviceInformation.FindAllAsync( DeviceClass.PortableStorageDevice );

to enumerate the removable drives and then searching the Id string of every DeviceInformation object for a specific pattern:

private StorageFolder _sdCard;
private StorageFolder _usbDrive;

foreach( DeviceInformation info in deviceInfos )
{
    string id = info.Id.ToUpper();

    try
    {

        if( id.Contains( SDId ) )
        {                            
            _sdCard = StorageDevice.FromId( info.Id );
        }
        else if( id.Contains( USBId ) )
        {
            _usbDrive = StorageDevice.FromId( info.Id );
        }

    }
    catch( Exception e)
    {
        Debug.WriteLine( "########## Error " + e );
    }

}

Unfortunately, StorageDevice.FromId() throws NotImplementedException.

I've enabled the capability for removable storage as well as file type associations in the .appxmanifest. I do not have any problems accessing files on any removable storage device. Did anyone experience a similar problem and find a solution for it? Does anyone have a different idea of reliably retrieving a StorageFolder for the SD Card if additional USB sticks might be attached?

Upvotes: 0

Views: 113

Answers (1)

Tim Wensky
Tim Wensky

Reputation: 134

Just after finishing the question I have found a solution myself, although I am not too happy with it. Using

StorageFolder                removableDevices = KnownFolders.RemovableDevices;
IReadOnlyList<StorageFolder> drives           = await removableDevices.GetFoldersAsync();

the first element in drives always represents the SD Card, this is also stated here: https://learn.microsoft.com/de-de/windows/uwp/files/access-the-sd-card

But I do not think this is a very reliable solution and I am still looking for something else.

Upvotes: 0

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