YY-Thunks - It's easier to make your apps compatible with older versions of Windows!

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1. About YY-Thunks

With each new version of Windows, a large number of APIs are added, and it often takes a lot of effort to develop Windows applications that are compatible with older systems. And some open source projects are no longer compatible with some earlier versions of Windows, such as Windows XP, Windows 7...

Isn't there a solution to quickly deal with the problem that the old system can't find the API?

YY-Thunks can solve these kinds of problems quickly and without changing the code. These compatibility issues can be resolved automatically by tweaking the linker. It's easier to make your apps compatible with older versions of Windows!

[ YY-Thunks QQ Group 633710173 ]

1.1. The principle of YY-Thunks

Use LoadLibrary and GetProcAddress to dynamically load the API. If the API doesn't exist, then implement its behavior and get your program running properly.

As follows: GetTickCount64

// Windows XP not support GetTickCount64.
ULONGLONG WINAPI GetTickCount64(VOID)
{
    if (auto const _pfnGetTickCount64 = try_get_GetTickCount64())
    {
        return _pfnGetTickCount64();
    }
    // Fallback
    return GetTickCount();
}

1.2. Highlight

• Faster! Safer! Built-in L2 cache and encrypt all function pointers to prevent brute-force memory searches. Minimize unwanted, unnecessary calls to LoadLibrary and GetProcAddress.
• Make your application easily compatible with Windows XP so you can focus on your business logic.
• The code is completely open source, and everyone is welcome to create PRs to contribute to the YY-Thunks.

2. How to used?

You can choose one of the following options, but it is recommended to use NuGet first, as NuGet is designed to be foolproof and easier to use.

2.1. For Vistual Studio C++ Project

1. Right-click on the Project and select Manage NuGet Packages, then search for YY-Thunks and choose the version that suits you, and finally click Install.
2. For XP support, Right click on the project, Properties - NuGet Packages Settings - YY-Thunks - 最小兼容系统版本 - 5.1.2600.0.
3. Rebuild the solution.

2.2. For Vistual Studio .NET Native AOT Project

1. modify the value of TargetFramework to net8.0-windows or net9.0-windows。
2. Right-click on the Project and select Manage NuGet Packages, then search for YY-Thunks and choose the version that suits you, and finally click Install.
3. For XP support, please modify the value of SupportedOSPlatformVersion to 5.1. For example:

   <Project Sdk="Microsoft.NET.Sdk">
       <PropertyGroup>
           <!-- ... -->
           <TargetFramework>net8.0-windows</TargetFramework>
           <SupportedOSPlatformVersion>5.1</SupportedOSPlatformVersion>
           <!-- ... -->
       </PropertyGroup>
     <!--...-->
   </Project>

4. Rebuild the solution.

2.3. For CMake Project

1. Create file Directory.Build.props in source directory, and add the following code:

   <?xml version="1.0" encoding="utf-8"?>
   <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
     <ItemGroup Condition="'$(MSBuildProjectExtension)' == '.vcxproj'">
       <ProjectCapability Include="PackageReferences" />
     </ItemGroup>
     <PropertyGroup Condition="'$(MSBuildProjectExtension)' == '.vcxproj'">
       <NuGetTargetMoniker Condition="'$(NuGetTargetMoniker)' == ''">native,Version=v0.0</NuGetTargetMoniker>
       <RuntimeIdentifiers Condition="'$(RuntimeIdentifiers)' == ''">win;win-x86;win-x64;win-arm;win-arm64</RuntimeIdentifiers>
   
       <!--Turn on Windows XP support, and you can choose according to your situation.-->
       <WindowsTargetPlatformMinVersion>5.1.2600</WindowsTargetPlatformMinVersion>
     </PropertyGroup>
     <ItemGroup Condition="'$(MSBuildProjectExtension)' == '.vcxproj'">
       <PackageReference Include="YY-Thunks">
         <!--YY-Thunks Version-->
         <Version>1.1.7-Beta3</Version>
       </PackageReference>      
     </ItemGroup>
     <!--从兼容性考虑，继续向上搜索 Directory.Build.props-->
     <PropertyGroup>
       <DirectoryBuildPropsPath>$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))</DirectoryBuildPropsPath>
     </PropertyGroup>
     <Import Project="$(DirectoryBuildPropsPath)" Condition="'$(DirectoryBuildPropsPath)' != ''"/>
   </Project>

2. Start Build, for example:

   # The Gen parameter must be use `Visual Studio`, as Visual Studio only supports nuget.
   # Assuming that the output dir is `.build\x86-Release`, you can modify it as needed.
   cmake -G "Visual Studio 17 2022" -A Win32 -DCMAKE_CONFIGURATION_TYPES:STRING=Release -DCMAKE_INSTALL_PREFIX:PATH=.\build\x86-Release .
   
   # Note the `-- -r` at the end, which is the command to restore the nuget package.
   cmake --build .\build\x86-Release --config Release -- -r
   
   cmake --install .\build\x86-Release --config Release
   

3. Rebuild the project

2.4. I don't want to use NuGet, how do I configure the project manually?

2.4.1. using obj file (MSVC Link)

1. Download and unzip YY-Thunks-Objs to project directory.
2. Linker - Input - Additional Dependencies, add objs\$(PlatformShortName)\YY_Thunks_for_WinXP.obj.
3. Linker - System - Minimum Required Version, set to 5.1 (WinXP 32-bit) or 5.2 (WinXP x64 or Win2003).
4. If the project is a Dynamic Link Library, then change Linker - Advanced - Custom Entry Point to DllMainCRTStartupForYY_Thunks (If you ignore this step, the XP system may crash with thread_local).
5. Rebuild the solution.

Note: If your app needs to be compatible with Vista or later, please set Additional Dependencies to objs\$(PlatformShortName)\YY_Thunks_for_Vista.obj。

2.4.2. using lib files (LLD-Link)

LLD-Link linkers using obj files will encounter duplicate symbol errors.

1. Download and unzip YY-Thunks-Lib to project directory.
2. Add a parameter like -LIBPATH:YY-Thunks_Root_Dir/lib/5.1.2600.0/x86 to the linker and make sure the order is higher than WinSDK.
3. Please add parameter -SUBSYSTEM:WINDOWS",5.1" or -SUBSYSTEM:CONSOLE",5.1" or -SUBSYSTEM:WINDOWS",5.2" or -SUBSYSTEM:CONSOLE",5.2" to linker.
4. If the project is a Dynamic Link Library, please add parameter -ENTRY:DllMainCRTStartupForYY_Thunks to linker (If you ignore this step, the XP system may crash with thread_local).
5. Rebuild the solution.

3. Compatibility

3.1. Supported Compiler

Compatible with all platforms.

• It is supported by all Visual Studio versions (such as: VC6.0, VS2008, VS2010, VS2015, VS2017, VS2019, VS2022...).
• All runtime modes are supported (such as: /MD, /MT, /MDd, /MTd).

3.2. Windows SDK Version Requirements

Thunks Target	At Least Windows SDK Version is required
Windows 2000	SDK 6.0 (VS2008 built-in)
Windows XP(2003)	SDK 6.0 (VS2008 built-in)
Windows Vista	SDK 6.0 (VS2008 built-in)
Windows 7	SDK 7.0
Windows 8	SDK 8.0
Windows 8.1	SDK 8.1
Windows 10 10240	SDK 10.0.10240
Windows 10 19041	SDK 10.0.19041

At least Windows SDK 6.0 is required.

Note: VC6.0 and VS2005 users should note that the SDK version that comes with these compilers by default is too low. Please upgrade the SDK to version 6.0 or later, and then use YY-Thunks, otherwise the link will not be successful! The different SDK version don't affect your app compatibility with the old system.

3.3. Thunks API List

See the ThunksList.md

4. Others

4.1. Changelog

See the releases Changelog

4.2. Third Party

• WinDepends
  • YY. Depends.Analyzer provides support for Windows API Sets based on this open source project.