initial implementation; UWP does not work yet

AppContainerTest/AppContainerTest (Package)/AppContainerTest (Package).wapproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition="'$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '15.0'">
+    <VisualStudioVersion>15.0</VisualStudioVersion>
+  </PropertyGroup>
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|x86">
+      <Configuration>Debug</Configuration>
+      <Platform>x86</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x86">
+      <Configuration>Release</Configuration>
+      <Platform>x86</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup>
+    <WapProjPath Condition="'$(WapProjPath)'==''">$(MSBuildExtensionsPath)\Microsoft\DesktopBridge\</WapProjPath>
+    <PathToXAMLWinRTImplementations>AppContainerTest\</PathToXAMLWinRTImplementations>
+  </PropertyGroup>
+  <Import Project="$(WapProjPath)\Microsoft.DesktopBridge.props" />
+  <PropertyGroup>
+    <ProjectGuid>ace7c503-878e-4c66-8b62-33ed3830f31a</ProjectGuid>
+    <TargetPlatformVersion>10.0.22621.0</TargetPlatformVersion>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <AssetTargetFallback>net6.0-windows$(TargetPlatformVersion);$(AssetTargetFallback)</AssetTargetFallback>
+    <DefaultLanguage>en-US</DefaultLanguage>
+    <AppxPackageSigningEnabled>false</AppxPackageSigningEnabled>
+    <EntryPointProjectUniqueName>..\AppContainerTest\AppContainerTest.csproj</EntryPointProjectUniqueName>
+  </PropertyGroup>
+  <ItemGroup>
+    <AppxManifest Include="Package.appxmanifest">
+      <SubType>Designer</SubType>
+    </AppxManifest>
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Images\SplashScreen.scale-200.png" />
+    <Content Include="Images\LockScreenLogo.scale-200.png" />
+    <Content Include="Images\Square150x150Logo.scale-200.png" />
+    <Content Include="Images\Square44x44Logo.scale-200.png" />
+    <Content Include="Images\Square44x44Logo.targetsize-24_altform-unplated.png" />
+    <Content Include="Images\StoreLogo.png" />
+    <Content Include="Images\Wide310x150Logo.scale-200.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\AppContainerTest\AppContainerTest.csproj">
+      <SkipGetTargetFrameworkProperties>True</SkipGetTargetFrameworkProperties>
+      <PublishProfile>Properties\PublishProfiles\win10-$(Platform).pubxml</PublishProfile>
+      <TrustLevel>Partial</TrustLevel>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="[1.2.221109.1]">
+      <IncludeAssets>build</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="[10.0.22621.755]">
+      <IncludeAssets>build</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+  <Import Project="$(WapProjPath)\Microsoft.DesktopBridge.targets" />
+</Project>

AppContainerTest/AppContainerTest (Package)/Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+  IgnorableNamespaces="uap rescap">
+
+  <Identity
+    Name="fc793027-d487-40c0-899e-66562fd62f8c"
+    Publisher="CN=lost"
+    Version="1.0.0.0" />
+
+  <mp:PhoneIdentity
+    PhoneProductId="fc793027-d487-40c0-899e-66562fd62f8c"
+    PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
+
+  <Properties>
+    <DisplayName>AppContainerTest (Package)</DisplayName>
+    <PublisherDisplayName>lost</PublisherDisplayName>
+    <Logo>Images\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="$targetentrypoint$">
+      <uap:VisualElements
+        DisplayName="AppContainerTest (Package)"
+        Description="AppContainerTest (Package)"
+        BackgroundColor="transparent"
+        Square150x150Logo="Images\Square150x150Logo.png"
+        Square44x44Logo="Images\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="Images\Wide310x150Logo.png" />
+        <uap:SplashScreen Image="Images\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+  </Capabilities>
+</Package>

AppContainerTest/AppContainerTest/App.xaml

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+<!-- Copyright (c) Microsoft Corporation and Contributors. -->
+<!-- Licensed under the MIT License. -->
+
+<Application
+  x:Class="AppContainerTest.App"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <Application.Resources>
+    <ResourceDictionary>
+      <ResourceDictionary.MergedDictionaries>
+        <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+        <!-- Other merged dictionaries here -->
+      </ResourceDictionary.MergedDictionaries>
+      <!-- Other app resources here -->
+    </ResourceDictionary>
+  </Application.Resources>
+</Application>

AppContainerTest/AppContainerTest/App.xaml.cs

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+namespace AppContainerTest;
+
+using Microsoft.UI.Xaml;
+
+/// <summary>
+/// Provides application-specific behavior to supplement the default Application class.
+/// </summary>
+public partial class App: Application {
+    /// <summary>
+    /// Initializes the singleton application object.  This is the first line of authored code
+    /// executed, and as such is the logical equivalent of main() or WinMain().
+    /// </summary>
+    public App() {
+        this.InitializeComponent();
+    }
+
+    /// <summary>
+    /// Invoked when the application is launched.
+    /// </summary>
+    /// <param name="args">Details about the launch request and process.</param>
+    protected override void OnLaunched(LaunchActivatedEventArgs args) {
+        this.mainWindow = new MainWindow();
+        this.mainWindow.Activate();
+    }
+
+    Window mainWindow;
+}

AppContainerTest/AppContainerTest/AppContainerTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>AppContainerTest</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifiers>win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
+    <UseWinUI>true</UseWinUI>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.2.221109.1" />
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.755" />
+    <Manifest Include="$(ApplicationManifest)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\PrivateNamespaces.csproj" />
+  </ItemGroup>
+</Project>

AppContainerTest/AppContainerTest/MainWindow.xaml

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+<!-- Copyright (c) Microsoft Corporation and Contributors. -->
+<!-- Licensed under the MIT License. -->
+
+<Window
+  x:Class="AppContainerTest.MainWindow"
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+  mc:Ignorable="d">
+
+  <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center">
+    <TextBox x:Name="Family" IsReadOnly="True"/>
+    <TextBox x:Name="BoundaryName" />
+    <TextBox x:Name="Path" />
+    <Button Click="Button_Click">Click Me</Button>
+    <TextBlock x:Name="Error" Foreground="Red" />
+  </StackPanel>
+</Window>

AppContainerTest/AppContainerTest/MainWindow.xaml.cs

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+namespace AppContainerTest;
+
+using System;
+using System.Diagnostics;
+using System.Security.Principal;
+using System.Threading;
+
+using LostTech.Win32.PrivateNamespaces;
+
+using Microsoft.UI.Xaml;
+
+using Windows.ApplicationModel;
+
+public sealed partial class MainWindow: Window {
+    public MainWindow() {
+        this.InitializeComponent();
+
+        this.Family.Text = Package.Current.Id.FamilyName;
+    }
+
+    void Button_Click(object sender, RoutedEventArgs e) {
+        try {
+            string[] parts = this.Path.Text.Split('\\', StringSplitOptions.RemoveEmptyEntries);
+            Debug.Assert(parts.Length == 2);
+
+            using var boundary = new BoundaryDescriptor(
+                this.BoundaryName.Text,
+                BoundaryDescriptor.CreateFlags.AddAppContainerSID);
+            boundary.Add(WellKnownSidType.WorldSid);
+            boundary.Add(WellKnownSidType.WinLowLabelSid);
+
+            using var ns = PrivateNamespace.Open(boundary, parts[0]);
+            try {
+                using var semaphore = Semaphore.OpenExisting(this.Path.Text);
+                semaphore.Release();
+                this.Error.Text = "";
+            } catch (Exception ex) {
+                this.Error.Text = $"unable to operate semaphore: {ex}";
+            }
+        } catch (Exception ex) {
+            this.Error.Text = $"unable to open private namespace: {ex}";
+        }
+    }
+}

AppContainerTest/AppContainerTest/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+    <assemblyIdentity version="1.0.0.0" name="AppContainerTest.app"/>
+
+    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+        <application>
+            <!--The ID below informs the system that this application is compatible with OS features first introduced in Windows 8. 
+            For more info see https://docs.microsoft.com/windows/win32/sysinfo/targeting-your-application-at-windows-8-1 
+            
+            It is also necessary to support features in unpackaged applications, for example the custom titlebar implementation.-->
+            <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+        </application>
+    </compatibility>
+
+    <application xmlns="urn:schemas-microsoft-com:asm.v3"
+                 xmlns:settings2005="http://schemas.microsoft.com/SMI/2005/WindowsSettings"
+                 xmlns:settings="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
+        <windowsSettings>
+            <!-- The combination of below two tags have the following effect:
+                 1) Per-Monitor for >= Windows 10 Anniversary Update
+                 2) System < Windows 10 Anniversary Update
+            -->
+            <settings2005:dpiAware>true/PM</settings2005:dpiAware>
+            <settings:dpiAwareness>PerMonitorV2, PerMonitor</settings:dpiAwareness>
+        </windowsSettings>
+    </application>
+</assembly>