From 3417a984fa81dc89d984aa3fd3728e90a92d79fb Mon Sep 17 00:00:00 2001
From: Syrone Wong <wong.syrone@gmail.com>
Date: Wed, 17 Aug 2016 10:28:27 +0800
Subject: [PATCH] Change requirements

- Running on Windows Vista or above

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>
---
 shadowsocks-csharp/Data/cn.txt  | 1 +
 shadowsocks-csharp/Program.cs   | 8 ++++++++
 shadowsocks-csharp/Util/Util.cs | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/shadowsocks-csharp/Data/cn.txt b/shadowsocks-csharp/Data/cn.txt
index d471863a..c7ef11a5 100644
--- a/shadowsocks-csharp/Data/cn.txt
+++ b/shadowsocks-csharp/Data/cn.txt
@@ -113,5 +113,6 @@ Failed to update registry=无法修改注册表
 System Proxy On: =系统代理已启用：
 Running: Port {0}=正在运行：端口 {0}
 Unexpected error, shadowsocks will exit. Please report to=非预期错误，Shadowsocks将退出。请提交此错误到
+Unsupported operating system, use Windows Vista at least.=不支持的操作系统版本，最低需求为Windows Vista。
 Proxy request failed=代理请求失败
 Proxy handshake failed=代理握手失败
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index be7e2afe..ee5465dc 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -18,6 +18,14 @@ namespace Shadowsocks
         [STAThread]
         static void Main()
         {
+            // Check OS since we are using dual-mode socket
+            if (!Utils.IsWinVistaOrHigher())
+            {
+                MessageBox.Show(I18N.GetString("Unsupported operating system, use Windows Vista at least."),
+                "Shadowsocks Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+
             Utils.ReleaseMemory(true);
             using (Mutex mutex = new Mutex(false, "Global\\Shadowsocks_" + Application.StartupPath.GetHashCode()))
             {
diff --git a/shadowsocks-csharp/Util/Util.cs b/shadowsocks-csharp/Util/Util.cs
index 53077c87..9170c348 100755
--- a/shadowsocks-csharp/Util/Util.cs
+++ b/shadowsocks-csharp/Util/Util.cs
@@ -157,6 +157,10 @@ namespace Shadowsocks.Util
             return userKey;
         }
 
+        public static bool IsWinVistaOrHigher() {
+            return Environment.OSVersion.Version.Major > 5;
+        }
+
         [DllImport("kernel32.dll")]
         [return: MarshalAs(UnmanagedType.Bool)]
         private static extern bool SetProcessWorkingSetSize(IntPtr process,