日志清理改为直接清理文件

日志文件越来越大，原有的清空日志只是清理记录窗口中显示的日志，实际并没有真的删除。

shadowsocks-csharp/Controller/Logging.cs

@@ -12,14 +12,17 @@ namespace Shadowsocks.Controller
     {
         public static string LogFilePath;
 
+        private static FileStream fs;
+        private static StreamWriterWithTimestamp sw;
+
         public static bool OpenLogFile()
         {
             try
             {
                 LogFilePath = Utils.GetTempPath("shadowsocks.log");
 
-                FileStream fs = new FileStream(LogFilePath, FileMode.Append);
-                StreamWriterWithTimestamp sw = new StreamWriterWithTimestamp(fs);
+                fs = new FileStream(LogFilePath, FileMode.Append);
+                sw = new StreamWriterWithTimestamp(fs);
                 sw.AutoFlush = true;
                 Console.SetOut(sw);
                 Console.SetError(sw);
@@ -35,7 +38,10 @@ namespace Shadowsocks.Controller
 
         private static void WriteToLogFile(object o)
         {
-            Console.WriteLine(o);
+            try {
+                Console.WriteLine(o);
+            } catch(ObjectDisposedException) {
+            }
         }
 
         public static void Error(object o)
@@ -48,6 +54,15 @@ namespace Shadowsocks.Controller
             WriteToLogFile(o);
         }
 
+        public static void clear() {
+            sw.Close();
+            sw.Dispose();
+            fs.Close();
+            fs.Dispose();
+            File.Delete(LogFilePath);
+            OpenLogFile();
+        }
+
         [Conditional("DEBUG")]
         public static void Debug(object o)
         {

shadowsocks-csharp/View/LogForm.cs

@@ -149,25 +149,25 @@ namespace Shadowsocks.View
 
         private void UpdateContent()
         {
-            using (StreamReader reader = new StreamReader(new FileStream(filename,
-                     FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
-            {
-                reader.BaseStream.Seek(lastOffset, SeekOrigin.Begin);
-
-                string line = "";
-                bool changed = false;
-                while ((line = reader.ReadLine()) != null)
-                {
-                    changed = true;
-                    LogMessageTextBox.AppendText(line + Environment.NewLine);
-                }
-
-                if (changed)
-                {
-                    LogMessageTextBox.ScrollToCaret();
+            try {
+                using(StreamReader reader = new StreamReader(new FileStream(filename,
+                         FileMode.Open, FileAccess.Read, FileShare.ReadWrite))) {
+                    reader.BaseStream.Seek(lastOffset, SeekOrigin.Begin);
+
+                    string line = "";
+                    bool changed = false;
+                    while((line = reader.ReadLine()) != null) {
+                        changed = true;
+                        LogMessageTextBox.AppendText(line + Environment.NewLine);
+                    }
+
+                    if(changed) {
+                        LogMessageTextBox.ScrollToCaret();
+                    }
+
+                    lastOffset = reader.BaseStream.Position;
                 }
-
-                lastOffset = reader.BaseStream.Position;
+            } catch(FileNotFoundException) {
             }
 
             this.Text = I18N.GetString("Log Viewer") +
@@ -247,6 +247,8 @@ namespace Shadowsocks.View
         #region Clean up the content in LogMessageTextBox.
         private void DoCleanLogs()
         {
+            Logging.clear();
+            lastOffset = 0;
             LogMessageTextBox.Clear();
         }