DataTransferManager.GetForCurrentView() in WinUI 3

Describe the bug Calling DataTransferManager.GetForCurrentView() fails with a System.Runtime.InteropServices.COMException: 'Element not found'. This is somewhat expected, given the ‘GetForCurrentView’ name.

However, I have not found any mention of this particular class. Especially not in the WinRT API changes for Desktop apps.

Is cleaning this up already somewhere on your radar? Can I work around this to make a share dialog work in WinUI 3?

Steps to reproduce the bug

var dataTransferManager = DataTransferManager.GetForCurrentView();
dataTransferManager.DataRequested += DataTransferManager_DataRequested;

Version Info

NuGet package version: WinUI 3 - Project Reunion 0.5: 0.5.5

Windows app type:

UWP	Win32
	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)	Yes
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

[shuice]

IDataTransferManagerInterop is exactly what I was looking for.

I’m using CsWin32, and with that the code to get the DataTransferManager for the current view is:

using WinRT;

var guid = Guid.Parse("a5caee9b-8708-49d1-8d36-67d25a8da00c");
var iop = DataTransferManager.As<IDataTransferManagerInterop>();
var transferManager = IntPtr.Zero;
iop.GetForWindow(PInvoke.GetActiveWindow(), guid, (void**)&transferManager);
var realManager = DataTransferManager.FromAbi(transferManager);

I filed an issue over at CSWin32 to see if that can be simplified in the future, but it works for now.

Thanks!

Maybe a comment could be added to the DataTransferManager docs or this document?

I use the following on WinUI3, It’s works, a little different on function GetForWindow, and different to page migrate-to-windows-app-sdk/guides/winui3

private void http_server_demo_share_send_uri(string uri)
{
        IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(this);
        IDataTransferManagerInterop interop = Windows.ApplicationModel.DataTransfer.DataTransferManager.As<IDataTransferManagerInterop>();

        var guid = Guid.Parse("a5caee9b-8708-49d1-8d36-67d25a8da00c");
        var iop = DataTransferManager.As<IDataTransferManagerInterop>();
        var transferManager = DataTransferManager.FromAbi(iop.GetForWindow(windowHandle, guid));
        transferManager.DataRequested += (DataTransferManager dtm, DataRequestedEventArgs args) =>
        {
                DataPackage dataPackage = new DataPackage();
                dataPackage.SetWebLink(new Uri(uri));
                dataPackage.Properties.Title = "Share uri \"" + uri + "\"";
                args.Request.Data = dataPackage;
        };

        interop.ShowShareUIForWindow(windowHandle);
}


[System.Runtime.InteropServices.ComImport, System.Runtime.InteropServices.Guid("3A3DCD6C-3EAB-43DC-BCDE-45671CE800C8")]
[System.Runtime.InteropServices.InterfaceType(System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIUnknown)]
interface IDataTransferManagerInterop
{
        IntPtr GetForWindow([System.Runtime.InteropServices.In] IntPtr appWindow, [System.Runtime.InteropServices.In] ref Guid riid);
        void ShowShareUIForWindow(IntPtr appWindow);
}

[anawishnoff]

Thanks! We’re planning on publishing this doc to our official docs site soon with some changes and this API should be included.