C++20&WinAPI プロセスの昇格タイプ（管理者権限等）を確認する

プロセスの昇格タイプを確認するサンプルコードです。カレントプロセスの昇格タイプがTOKEN_ELEVATION_TYPE::TokenElevationTypeFullか確かめることで管理者権限を確認できます。

#include <optional>

#define STRICT
#define NOMINMAX
#include <Windows.h>

std::optional<TOKEN_ELEVATION_TYPE> GetProcessElevationType(HANDLE ProcessHandle) noexcept
{
    std::optional<TOKEN_ELEVATION_TYPE> Result{};
    HANDLE TokenHandle;
    if (::OpenProcessToken(ProcessHandle, TOKEN_QUERY, &TokenHandle))
    {
        TOKEN_ELEVATION_TYPE ElevationType;
        DWORD Size = sizeof(TOKEN_ELEVATION_TYPE);
        if (::GetTokenInformation(
            TokenHandle,
            TOKEN_INFORMATION_CLASS::TokenElevationType,
            &ElevationType,
            Size, &Size))
        {
            Result = ElevationType;
        }
        ::CloseHandle(TokenHandle);
    }
    return Result;
}

inline std::optional<TOKEN_ELEVATION_TYPE> GetCurrentProcessElevationType() noexcept {
    return GetProcessElevationType(GetCurrentProcess());
}

inline bool IsCurrentProcessElevationTypeDefault() {
    auto ElevationType = GetCurrentProcessElevationType();
    if (!ElevationType) return false;
    return *ElevationType == TOKEN_ELEVATION_TYPE::TokenElevationTypeDefault;
}

inline bool IsCurrentProcessElevationTypeLimited() {
    auto ElevationType = GetCurrentProcessElevationType();
    if (!ElevationType) return false;
    return *ElevationType == TOKEN_ELEVATION_TYPE::TokenElevationTypeLimited;
}

inline bool IsCurrentProcessElevationTypeFull() {
    auto ElevationType = GetCurrentProcessElevationType();
    if (!ElevationType) return false;
    return *ElevationType == TOKEN_ELEVATION_TYPE::TokenElevationTypeFull;
}

int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int)
{
    auto ElevationTypeDefault = IsCurrentProcessElevationTypeDefault();
    auto ElevationTypeLimited = IsCurrentProcessElevationTypeLimited();
    auto ElevationTypeFull = IsCurrentProcessElevationTypeFull();

    // 通常権限で起動　：FTF（起動プロセス・ユーザーの権限に依存）
    // 管理者権限で起動：FFT

    return 0;
}