Workaround NotifyIcon's 63 chars limit(#965)

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

shadowsocks-csharp/Util/ViewUtils.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Windows.Forms;
 
 namespace Shadowsocks.Util
@@ -17,5 +18,18 @@ namespace Shadowsocks.Util
             var children = control.Controls.OfType<TControl>().ToList();
             return children.SelectMany(GetChildControls<TControl>).Concat(children);
         }
+
+        // Workaround NotifyIcon's 63 chars limit
+        // https://stackoverflow.com/questions/579665/how-can-i-show-a-systray-tooltip-longer-than-63-chars
+        public static void SetNotifyIconText(NotifyIcon ni, string text)
+        {
+            if (text.Length >= 128)
+                throw new ArgumentOutOfRangeException("Text limited to 127 characters");
+            Type t = typeof(NotifyIcon);
+            BindingFlags hidden = BindingFlags.NonPublic | BindingFlags.Instance;
+            t.GetField("text", hidden).SetValue(ni, text);
+            if ((bool)t.GetField("added", hidden).GetValue(ni))
+                t.GetMethod("UpdateIcon", hidden).Invoke(ni, new object[] { true });
+        }
     }
 }

shadowsocks-csharp/View/MenuViewController.cs

@@ -180,13 +180,13 @@ namespace Shadowsocks.View
             {
                 serverInfo = config.GetCurrentServer().FriendlyName();
             }
-            // we want to show more details but notify icon title is limited to 63 characters
+            // show more info by hacking the P/Invoke declaration for NOTIFYICONDATA inside Windows Forms
             string text = I18N.GetString("Shadowsocks") + " " + UpdateChecker.Version + "\n" +
                           (enabled ?
                               I18N.GetString("System Proxy On: ") + (global ? I18N.GetString("Global") : I18N.GetString("PAC")) :
                               String.Format(I18N.GetString("Running: Port {0}"), config.localPort))  // this feedback is very important because they need to know Shadowsocks is running
                           + "\n" + serverInfo;
-            _notifyIcon.Text = text.Substring(0, Math.Min(63, text.Length));
+            ViewUtils.SetNotifyIconText(_notifyIcon, text);
         }
 
         private Bitmap getTrayIconByState(Bitmap originIcon, bool enabled, bool global)