Windowsバージョンの取得方法

アプリケーションが動作しているWindows環境について、Windowsの種類（Windows XP, Vista, 7, Server 2003, Server 2008など）とService Packを取得する方法を調べたのでメモしておきます。

まず、バージョン判定の考え方ですが、これはMicrosoftのサイトに載っていました。

• OSVERSIONINFOEX Structure (Windows)
  • http://msdn.microsoft.com/en-us/library/ms724833%28VS.85%29.aspx

Operating system	Version number	dwMajorVersion	dwMinorVersion	Other
Windows 7	6.1	6	1	OSVERSIONINFOEX.wProductType == VER_NT_WORKSTATION
Windows Server 2008 R2	6.1	6	1	OSVERSIONINFOEX.wProductType != VER_NT_WORKSTATION
Windows Server 2008	6.0	6	0	OSVERSIONINFOEX.wProductType != VER_NT_WORKSTATION
Windows Vista	6.0	6	0	OSVERSIONINFOEX.wProductType == VER_NT_WORKSTATION
Windows Server 2003 R2	5.2	5	2	GetSystemMetrics(SM_SERVERR2) != 0
Windows Home Server	5.2	5	2	OSVERSIONINFOEX.wSuiteMask & VER_SUITE_WH_SERVER
Windows Server 2003	5.2	5	2	GetSystemMetrics(SM_SERVERR2) == 0
Windows XP Professional x64 Edition	5.2	5	2	(OSVERSIONINFOEX.wProductType == VER_NT_WORKSTATION) && (SYSTEM_INFO.wProcessorArchitecture　==　PROCESSOR_ARCHITECTURE_AMD64)
Windows XP	5.1	5	1	Not applicable
Windows 2000	5.0	5	0	Not applicable

さらに、上記表をC++言語で実装したサンプルも記述されていました。

• Getting the System Version (Windows)
  • http://msdn.microsoft.com/en-us/library/ms724429(v=VS.85).aspx

あとは、C#に置き換えて終わりです。次のようになりました。ただし、エディションの取得は割愛しています。

動作確認した環境は、Windows 7のみです。他の環境では動作させていないので、バグなどにより動作しない場合があるかも知れません。もし、動作確認した方がいましたら、コメントに記述して頂けると助かります。

using System;
using System.Runtime.InteropServices;

    #region 構造体、定数、DLL定義

    [StructLayout(LayoutKind.Sequential)]
    private struct OSVERSIONINFOEX
    {
        public int dwOSVersionInfoSize;
        public int dwMajorVersion;
        public int dwMinorVersion;
        public int dwBuildNumber;
        public int dwPlatformId;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string szCSDVersion;
        public short wServicePackMajor;
        public short wServicePackMinor;
        public short wSuiteMask;
        public byte wProductType;
        public byte wReserved;
    }

    // GetVersionEx
    private const Int32 VER_NT_WORKSTATION = 1;
    private const Int32 VER_NT_DOMAIN_CONTROLLER = 2;
    private const Int32 VER_NT_SERVER = 3;
    private const Int32 VER_SUITE_SMALLBUSINESS = 1;
    private const Int32 VER_SUITE_ENTERPRISE = 2;
    private const Int32 VER_SUITE_TERMINAL = 16;
    private const Int32 VER_SUITE_DATACENTER = 128;
    private const Int32 VER_SUITE_SINGLEUSERTS = 256;
    private const Int32 VER_SUITE_PERSONAL = 512;
    private const Int32 VER_SUITE_BLADE = 1024;
    private const Int32 VER_SUITE_STORAGE_SERVER = 8192; //0x00002000;
    private const Int32 VER_SUITE_WH_SERVER = 32768; //0x00008000;

    // GetSystemMetrics
    private const Int32 SM_SERVERR2 = 89;

    // エラー
    private const string ERR = "取得失敗";

    [DllImport("kernel32.dll")]
    private static extern bool GetVersionEx(ref OSVERSIONINFOEX osVersionInfo);

    [DllImport("user32.dll")]
    private static extern int GetSystemMetrics(Int32 nIndex);

    #endregion

    public string GetOSDisplayString()
    {
        string result = ERR;
        OSVERSIONINFOEX osVersionInfo = new OSVERSIONINFOEX();
        OperatingSystem osInfo = Environment.OSVersion;

        osVersionInfo.dwOSVersionInfoSize =
               Marshal.SizeOf(typeof(OSVERSIONINFOEX));

        if (!GetVersionEx(ref osVersionInfo))
        {
            return ERR;
        }

        if (osInfo.Platform == PlatformID.Win32NT)
        {
            if (osInfo.Version.Major > 4)
            {
                result = "Microsoft ";
            }

            if (osInfo.Version.Major == 6)
            {
                if (osInfo.Version.Minor == 0)
                {
                    if (osVersionInfo.wProductType == VER_NT_WORKSTATION)
                    {
                        result += "Windows Vista";
                    }
                    else
                    {
                        result += "Windows Server 2008";
                    }
                }
                else if (osInfo.Version.Minor == 1)
                {
                    if (osVersionInfo.wProductType == VER_NT_WORKSTATION)
                    {
                        result += "Windows 7";
                    }
                    else
                    {
                        result += "Windows Server 2008 R2";
                    }
                }
            }
            else if (osInfo.Version.Major == 5)
            {
                if (osInfo.Version.Minor == 2)
                {
                    if (GetSystemMetrics(SM_SERVERR2) != 0)
                    {
                        result += "Windows Server 2003 R2";
                    }
                    else if ((osVersionInfo.wSuiteMask & VER_SUITE_STORAGE_SERVER) > 0)
                    {
                        result += "Windows Storage Server 2003";
                    }
                    else if ((osVersionInfo.wSuiteMask & VER_SUITE_WH_SERVER) > 0)
                    {
                        result += "Windows Home Server";
                    }
                    else if (osVersionInfo.wProductType == VER_NT_WORKSTATION && IntPtr.Size == 8)
                    {
                        result += "Windows XP Professional x64 Edition";
                    }
                    else
                    {
                        result += "Windows Server 2003";
                    }

                    // エディション取得処理は省略
                }
                else if (osInfo.Version.Minor == 1)
                {
                    result += "Windows XP";
                }
                else if (osInfo.Version.Minor == 0)
                {
                    result += "Windows 2000";
                }
            }

            // Include service pack (if any)
            if (osVersionInfo.szCSDVersion.Length > 0)
            {
                result += " " + osVersionInfo.szCSDVersion;
            }

            // Architecture
            if (IntPtr.Size == 4)
            {
                result += ", 32-bit";
            }
            else
            {
                result += ", 64-bit";
            }
        }
        else if (osInfo.Platform == PlatformID.Win32Windows)
        {
            result = "This sample does not support this version of Windows.";
        }

        return result;
    }

C++言語をC#言語に置き換えする際に、参考にしたページは次になります。

• OS Name, Version & Product Type - CodeProject
  • http://www.codeproject.com/KB/system/osversion_producttype.aspx

• アプリケーションが64ビットで動いているか調べる、OSが64ビットか調べる: .NET Tips: C#, VB.NET, Visual Studio
  • http://dobon.net/vb/dotnet/system/is64bit.html

動作確認環境

• OS: Windows 7
• 開発環境: Microsoft C# 2008 Express Edition