--- a/log/log.txt	Tue Dec 02 17:52:52 2014 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,92 +0,0 @@
-Interfaces :en1
-Interfaces :en1
-Interfaces :en0
-Interfaces :en0
-Interfaces :en0
-Interfaces :en0
-accept port = 5950
-VNCNetworkInterface :lo0
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--- a/src/viewer_swing/java/com/glavsoft/viewer/TreeViewer.java	Tue Dec 02 17:52:52 2014 +0900
+++ b/src/viewer_swing/java/com/glavsoft/viewer/TreeViewer.java	Sun Dec 07 11:38:40 2014 +0900
@@ -14,23 +14,31 @@
     private int fixingSizeWidth;
     private int fixingSizeHeight;
     private String hostName = null;
+    private String logFileName = null;
     private boolean noConnection = false;
     private boolean permitChangeScreen = true;
     private boolean showTree = false;
     private boolean checkDelay = false;
     private boolean addSerialNum = false;
     private boolean fixingSizeDisplay = false;
+    private boolean logFile;
 
 
-    public static void main(String[] args) throws FileNotFoundException {
-        PrintStream out = new PrintStream("log/log.txt");
-        System.setOut(out);
-
+    public static void main(String[] args) {
         new TreeViewer().vncStart(args);
     }
 
     private void vncStart(String[] args) {
         modeSelect(args);
+        if(logFile) {
+            PrintStream out = null;
+            try {
+                out = new PrintStream(logFileName + ".txt");
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+            }
+            System.setOut(out);
+        }
         if (treeProxy && !viewer) {
             // start treeManager only ( -p flag )
             VncProxyService vps = new VncProxyService();
@@ -114,6 +122,23 @@
             } else if ("--addSerialNum".equals(args[i])) {
                 // add data serial number.
                 addSerialNum = true;
+            } else if ("--logFile".equals(args[i])) {
+                // add log file.
+                logFile = true;
+                try {
+                    this.logFileName = args[++i];
+                } catch (ArrayIndexOutOfBoundsException e) {
+                    System.out.println("Please put the log file name. If you do not put file name, set file name logFile.txt");
+                }
+                if (logFileName == null) {
+                    logFileName = "logFile";
+                } else if ("-".equals(logFileName.substring(0,1))) {
+                    System.out.println("Please put the log file name. If you do not put file name, set file name logFile.txt");
+                    logFileName = "logFile";
+                    i++;
+                } else {
+                    i++;
+                }
             } else {
                 System.out.println("(default) TreeVNCClient\n"
                         + "-v or -c:         View shared screen.\n"