Calculate the value for just about any constant in the Windows SDK

Get-WindowsSDKConstant.ps1

[CmdletBinding()]

param(
    [Parameter(Mandatory = $true)]
    [string] $Name
)

$ErrorActionPreference = 'Continue'

function Main {
    $buildDir = New-TemporaryDirectory
    Push-Location $buildDir
    try {

        $sourcePath = Join-Path $buildDir 'getconstant.cpp'

        Get-ConstantCppSource $Name | Out-File $sourcePath -Encoding ascii

        Set-VisualStudioEnvironmentVariables

        & (Get-ClPath) /EHsc $sourcePath 2>&1 | Out-Null

        if ($LASTEXITCODE -ne 0) {
            Write-Error "Unable to locate constant '$Name'"
            exit 1
        }

        & $buildDir\getconstant.exe
    }
    finally {
        Pop-Location
        Remove-Item -Recurse $buildDir
    }
}

function Get-VisualStudioToolsPath {
    $toolsDir = 99..1 |
        foreach { Get-EnvironmentVariable "VS${_}0COMNTOOLS" } |
        where { $_ } |
        select -First 1
    if (-not $toolsDir) {
        throw "Unable to locate Visual Studio install directory. Have you installed it?"
    }
    Write-Output $toolsDir
}

function Get-ClPath {
    $toolsDir = Get-VisualStudioToolsPath
    $binDir = Resolve-Path "$toolsDir\..\..\VC\bin"
    Join-Path $binDir 'cl.exe'
}

function Get-IncludeDir {
    if (-not (Test-Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows Kits\Installed Roots')) {
        throw "Unable to locate Windows 10 SDK. Have you installed it?"
    }

    $sdkDir = Get-ItemPropertyValue "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows Kits\Installed Roots" -Name KitsRoot10
    $includeDir = Join-Path $sdkDir 'Include'
    $newestVersion = Get-ChildItem $includeDir |
        sort Name -Descending |
        select -First 1 -ExpandProperty Name

    Join-Path $includeDir $newestVersion
}

function Get-IncludeFiles {
    param(
        [string] $Name
    )

    Get-ChildItem (Get-IncludeDir) -Recurse -Include '*.h' |
        where {
            Select-String -Path $_ -SimpleMatch -CaseSensitive -Pattern "#define $Name" -List
        }
}

function Get-ConstantCppSource() {
    param(
        [string] $Name
    )

    $includes = Get-IncludeFiles $Name | foreach { "#include <$($_.Name)>" }

@"
#include <iostream>
#include <Windows.h>

$($includes -join "`n")

using namespace std;

void repr(void *value) { cout << (long)value << endl; }

void repr(int value)            { cout << value << endl; }
void repr(unsigned int value)   { cout << value << endl; }
void repr(long value)           { cout << value << endl; }
void repr(unsigned long value)  { cout << value << endl; }

void repr(char* value)  { cout << '\"' << value << '\"' << endl; }

int main()
{
    repr($Name);

    return 0;
}
"@
}

function Set-VisualStudioEnvironmentVariables {
    if ($env:DevEnvDir) {
        return
    }

    $toolsDir = Get-VisualStudioToolsPath
    $batPath = [IO.Path]::GetTempFileName() -replace 'tmp$','bat'
@"
@echo off
call "$toolsDir\VsDevCmd.bat"
set
"@ | Out-File -Encoding ascii $batPath
    & $env:ComSpec /c $batPath | foreach {
        $parts = $_.Split('=', 2)
        [Environment]::SetEnvironmentVariable($parts[0], $parts[1], [EnvironmentVariableTarget]::Process)
    }
    Remove-Item $batPath
}

function Get-EnvironmentVariable {
    param(
        [string] $Name
    )
    [Environment]::GetEnvironmentVariable($Name, [EnvironmentVariableTarget]::Process)
}

function New-TemporaryDirectory {
    $parent = [System.IO.Path]::GetTempPath()
    [string] $name = [System.Guid]::NewGuid()
    New-Item -ItemType Directory -Path (Join-Path $parent $name)
}

Main
[CmdletBinding()]

param(
    [Parameter(Mandatory = $true)]
    [string] $Name
)

$ErrorActionPreference = 'Continue'

function Main {
    $buildDir = New-TemporaryDirectory
    Push-Location $buildDir
    try {

        $sourcePath = Join-Path $buildDir 'getconstant.cpp'

        Get-ConstantCppSource $Name | Out-File $sourcePath -Encoding ascii

        Set-VisualStudioEnvironmentVariables

        & (Get-ClPath) /EHsc $sourcePath 2>&1 | Out-Null

        if ($LASTEXITCODE -ne 0) {
            Write-Error "Unable to locate constant '$Name'"
            exit 1
        }

        & $buildDir\getconstant.exe
    }
    finally {
        Pop-Location
        Remove-Item -Recurse $buildDir
    }
}

function Get-VisualStudioToolsPath {
    $toolsDir = 99..1 |
        foreach { Get-EnvironmentVariable "VS${_}0COMNTOOLS" } |
        where { $_ } |
        select -First 1
    if (-not $toolsDir) {
        throw "Unable to locate Visual Studio install directory. Have you installed it?"
    }
    Write-Output $toolsDir
}

function Get-ClPath {
    $toolsDir = Get-VisualStudioToolsPath
    $binDir = Resolve-Path "$toolsDir\..\..\VC\bin"
    Join-Path $binDir 'cl.exe'
}

function Get-IncludeDir {
    if (-not (Test-Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows Kits\Installed Roots')) {
        throw "Unable to locate Windows 10 SDK. Have you installed it?"
    }

    $sdkDir = Get-ItemPropertyValue "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows Kits\Installed Roots" -Name KitsRoot10
    $includeDir = Join-Path $sdkDir 'Include'
    $newestVersion = Get-ChildItem $includeDir |
        sort Name -Descending |
        select -First 1 -ExpandProperty Name

    Join-Path $includeDir $newestVersion
}

function Get-IncludeFiles {
    param(
        [string] $Name
    )

    Get-ChildItem (Get-IncludeDir) -Recurse -Include '*.h' |
        where {
            Select-String -Path $_ -SimpleMatch -CaseSensitive -Pattern "#define $Name" -List
        }
}

function Get-ConstantCppSource() {
    param(
        [string] $Name
    )

    $includes = Get-IncludeFiles $Name | foreach { "#include <$($_.Name)>" }

@"
#include <iostream>
#include <Windows.h>

$($includes -join "`n")

using namespace std;

void repr(void *value) { cout << (long)value << endl; }

void repr(int value)            { cout << value << endl; }
void repr(unsigned int value)   { cout << value << endl; }
void repr(long value)           { cout << value << endl; }
void repr(unsigned long value)  { cout << value << endl; }

void repr(char* value)  { cout << '\"' << value << '\"' << endl; }

int main()
{
    repr($Name);

    return 0;
}
"@
}

function Set-VisualStudioEnvironmentVariables {
    if ($env:DevEnvDir) {
        return
    }

    $toolsDir = Get-VisualStudioToolsPath
    $batPath = [IO.Path]::GetTempFileName() -replace 'tmp$','bat'
@"
@echo off
call "$toolsDir\VsDevCmd.bat"
set
"@ | Out-File -Encoding ascii $batPath
    & $env:ComSpec /c $batPath | foreach {
        $parts = $_.Split('=', 2)
        [Environment]::SetEnvironmentVariable($parts[0], $parts[1], [EnvironmentVariableTarget]::Process)
    }
    Remove-Item $batPath
}

function Get-EnvironmentVariable {
    param(
        [string] $Name
    )
    [Environment]::GetEnvironmentVariable($Name, [EnvironmentVariableTarget]::Process)
}

function New-TemporaryDirectory {
    $parent = [System.IO.Path]::GetTempPath()
    [string] $name = [System.Guid]::NewGuid()
    New-Item -ItemType Directory -Path (Join-Path $parent $name)
}

Main