Some dodgy way for UWP Overlays.

Add self ejecting Enabler dll

GlosSI.sln

@@ -7,6 +7,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "GlosSITarget", "GlosSITarge
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "GlosSIConfig", "GlosSIConfig\GlosSIConfig.vcxproj", "{4B42920B-3CC6-475F-A5B3-441337968483}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "UWPOverlayEnablerDLL", "UWPOverlayEnablerDLL\UWPOverlayEnablerDLL.vcxproj", "{50212575-87E2-40AB-87EE-EAED19C8EBB2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -29,6 +31,14 @@ Global
 		{4B42920B-3CC6-475F-A5B3-441337968483}.Release|x64.ActiveCfg = Release|x64
 		{4B42920B-3CC6-475F-A5B3-441337968483}.Release|x64.Build.0 = Release|x64
 		{4B42920B-3CC6-475F-A5B3-441337968483}.Release|x86.ActiveCfg = Release|x64
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Debug|x64.ActiveCfg = Debug|x64
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Debug|x64.Build.0 = Debug|x64
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Debug|x86.ActiveCfg = Debug|Win32
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Debug|x86.Build.0 = Debug|Win32
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Release|x64.ActiveCfg = Release|x64
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Release|x64.Build.0 = Release|x64
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Release|x86.ActiveCfg = Release|Win32
+		{50212575-87E2-40AB-87EE-EAED19C8EBB2}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

UWPOverlayEnablerDLL/UWPOverlayEnablerDLL.vcxproj

@@ -0,0 +1,165 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>16.0</VCProjectVersion>
+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{50212575-87e2-40ab-87ee-eaed19c8ebb2}</ProjectGuid>
+    <RootNamespace>UWPOverlayEnablerDLL</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v142</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+    <IncludePath>..\deps\subhook;$(IncludePath)</IncludePath>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+    <IncludePath>..\deps\subhook;$(IncludePath)</IncludePath>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;_DEBUG;UWPOVERLAYENABLERDLL_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;NDEBUG;UWPOVERLAYENABLERDLL_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;UWPOVERLAYENABLERDLL_EXPORTS;_WINDOWS;_USRDLL;SUBHOOK_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;UWPOVERLAYENABLERDLL_EXPORTS;_WINDOWS;_USRDLL;SUBHOOK_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\deps\subhook\subhook.c" />
+    <ClCompile Include="dllmain.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\deps\subhook\subhook.h" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

UWPOverlayEnablerDLL/UWPOverlayEnablerDLL.vcxproj.filters

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\deps\subhook\subhook.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\deps\subhook\subhook.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>

UWPOverlayEnablerDLL/dllmain.cpp

@@ -0,0 +1,128 @@
+/*
+Copyright 2021 Peter Repukat - FlatspotSoftware
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+
+There are two (known to me, at time of writing) ways to get a working overlay for UWP Apps
+1. Create an accessibility app
+	Set UIAcces in manifest to true
+	This however requires that the application is digitally signed
+	and is run from a trusted directory (Program Files; System32)
+	At this point UWP overlays are not a technical issue anymore, but a monetary
+	I have no interest in spending ~100 bucks a year just to provide this functionality to users.
+
+	You could also self-sign the application, but installing a trusted root CA is a security risk
+
+2.  Use undocumented SetWindowBand function
+	This function however is not freely callable from every process.
+	Even when injected into explorer.exe, it doesn't seem to work when just calling normally...
+	So let's hook the original function, and try to do "the magic" then
+	This seemingly works ¯\_(ツ)_/¯
+	
+	"The magic":
+		Hook SetWindowBand
+		One called, find GlosSI Window
+		Set GlosSI Window to notification ZBID (Doesn't seem to require any special stuff)
+		Self-Eject
+		
+		**PROFIT!**
+
+*/
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+#define SUBHOOK_STATIC
+#include <atomic>
+#include <subhook.h>
+
+enum ZBID
+{
+	ZBID_DEFAULT = 0,
+	ZBID_DESKTOP = 1,
+	ZBID_UIACCESS = 2,
+	ZBID_IMMERSIVE_IHM = 3,
+	ZBID_IMMERSIVE_NOTIFICATION = 4,
+	ZBID_IMMERSIVE_APPCHROME = 5,
+	ZBID_IMMERSIVE_MOGO = 6,
+	ZBID_IMMERSIVE_EDGY = 7,
+	ZBID_IMMERSIVE_INACTIVEMOBODY = 8,
+	ZBID_IMMERSIVE_INACTIVEDOCK = 9,
+	ZBID_IMMERSIVE_ACTIVEMOBODY = 10,
+	ZBID_IMMERSIVE_ACTIVEDOCK = 11,
+	ZBID_IMMERSIVE_BACKGROUND = 12,
+	ZBID_IMMERSIVE_SEARCH = 13,
+	ZBID_GENUINE_WINDOWS = 14,
+	ZBID_IMMERSIVE_RESTRICTED = 15,
+	ZBID_SYSTEM_TOOLS = 16,
+	ZBID_LOCK = 17,
+	ZBID_ABOVELOCK_UX = 18,
+};
+typedef BOOL(WINAPI* fSetWindowBand)(HWND hWnd, HWND hwndInsertAfter, DWORD dwBand);
+
+
+subhook::Hook SetWindowBandHook;
+fSetWindowBand SetWindowBand;
+
+std::atomic<bool> allow_exit = false;
+
+BOOL WINAPI SetGlosSIWindowBand(HWND hWnd, HWND hwndInsertAfter, DWORD dwBand)
+{
+	subhook::ScopedHookRemove remove(&SetWindowBandHook);
+	const auto glossi_hwnd = FindWindowA(nullptr, "GlosSITarget");
+	if (glossi_hwnd)
+	{
+		// Most window bands don't really seem to work.
+		// However, notification does!
+		SetWindowBand(glossi_hwnd, nullptr, ZBID_IMMERSIVE_NOTIFICATION);
+		allow_exit = true;
+	}
+	return SetWindowBand(hWnd, hwndInsertAfter, dwBand);
+}
+
+DWORD WINAPI HackThread(HMODULE hModule)
+{
+	while (!allow_exit)
+	{
+		Sleep(10);
+	}
+	if (SetWindowBandHook.IsInstalled())
+		SetWindowBandHook.Remove();
+	FreeLibraryAndExitThread(hModule, 0);
+}
+
+BOOL APIENTRY DllMain( HMODULE hModule,
+                       DWORD  ul_reason_for_call,
+                       LPVOID lpReserved
+                     )
+{
+	if (ul_reason_for_call == DLL_PROCESS_ATTACH)
+	{
+		const auto hpath = LoadLibrary(L"user32.dll");
+		if (hpath)
+		{
+			SetWindowBand = reinterpret_cast<fSetWindowBand>(GetProcAddress(hpath, "SetWindowBand"));
+			SetWindowBandHook.Install(GetProcAddress(hpath, "SetWindowBand"), &SetGlosSIWindowBand, subhook::HookFlags::HookFlag64BitOffset);
+			CloseHandle(CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)HackThread, hModule, 0, nullptr));
+		}
+	}
+	else if (ul_reason_for_call == DLL_PROCESS_DETACH) {
+		if (SetWindowBandHook.IsInstalled())
+			SetWindowBandHook.Remove();
+	}
+    return TRUE;
+}
+