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Pass FG rights to extensions when we access them (#38068)

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Calling Win32 APIs from C# is usually easy! but mixing C#+WinRT+COM is dark and full of terrors

Closes https://github.com/zadjii-msft/PowerToys/issues/546


Co-authored-by: Manodasan Wignarajah <mawign@microsoft.com>
This commit is contained in:
Mike Griese
2025-03-24 06:29:40 -05:00
committed by GitHub
parent 43783d2cff
commit 4e7bd34c4d
2 changed files with 45 additions and 5 deletions
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26
src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/ShellViewModel.cs
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@@ -2,6 +2,8 @@
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using CommunityToolkit.Common;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
@@ -13,7 +15,7 @@ using Microsoft.CmdPal.UI.ViewModels.Messages;
using Microsoft.CmdPal.UI.ViewModels.Models;
using Microsoft.CommandPalette.Extensions;
using Microsoft.Extensions.DependencyInjection;
using Windows.Win32;
using WinRT;
namespace Microsoft.CmdPal.UI.ViewModels;
@@ -148,14 +150,16 @@ public partial class ShellViewModel(IServiceProvider _serviceProvider, TaskSched
// need to handle that
_activeExtension = extension;
var extensionComObject = _activeExtension?.GetExtensionObject();
if (extensionComObject != null)
var extensionWinRtObject = _activeExtension?.GetExtensionObject();
if (extensionWinRtObject != null)
{
try
{
unsafe
{
var hr = PInvoke.CoAllowSetForegroundWindow(extensionComObject);
var winrtObj = (IWinRTObject)extensionWinRtObject;
var intPtr = winrtObj.NativeObject.ThisPtr;
var hr = Native.CoAllowSetForegroundWindow(intPtr);
if (hr != 0)
{
Logger.LogWarning($"Error giving foreground rights: 0x{hr.Value:X8}");
@@ -174,4 +178,18 @@ public partial class ShellViewModel(IServiceProvider _serviceProvider, TaskSched
{
SetActiveExtension(null);
}
// You may ask yourself, why aren't we using CsWin32 for this?
// The CsWin32 projected version includes some object marshalling, like so:
//
// HRESULT CoAllowSetForegroundWindow([MarshalAs(UnmanagedType.IUnknown)] object pUnk,...)
//
// And if you do it like that, then the IForegroundTransfer interface isn't marshalled correctly
internal sealed class Native
{
[DllImport("OLE32.dll", ExactSpelling = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
[SupportedOSPlatform("windows5.0")]
internal static extern unsafe global::Windows.Win32.Foundation.HRESULT CoAllowSetForegroundWindow(nint pUnk, [Optional] void* lpvReserved);
}
}