diff --git a/v2rayN/v2rayN/Common/QRCodeHelper.cs b/v2rayN/v2rayN/Common/QRCodeHelper.cs
index 0c4fbdb2..9b02a48b 100644
--- a/v2rayN/v2rayN/Common/QRCodeHelper.cs
+++ b/v2rayN/v2rayN/Common/QRCodeHelper.cs
@@ -1,6 +1,13 @@
 using QRCoder;
 using QRCoder.Xaml;
+using System.Drawing;
+using System.Windows.Interop;
+using System.Windows;
 using System.Windows.Media;
+using ZXing.Common;
+using ZXing.QrCode;
+using ZXing.Windows.Compatibility;
+using ZXing;
 
 namespace v2rayN
 {
@@ -28,5 +35,70 @@ namespace v2rayN
                 return null;
             }
         }
+
+        public static string ScanScreen(float dpiX, float dpiY)
+        {
+            try
+            {
+                var left = (int)(SystemParameters.WorkArea.Left);
+                var top = (int)(SystemParameters.WorkArea.Top);
+                var width = (int)(SystemParameters.WorkArea.Width / dpiX);
+                var height = (int)(SystemParameters.WorkArea.Height / dpiY);
+
+                using Bitmap fullImage = new Bitmap(width, height);
+                using (Graphics g = Graphics.FromImage(fullImage))
+                {
+                    g.CopyFromScreen(left, top, 0, 0, fullImage.Size, CopyPixelOperation.SourceCopy);
+                }
+                int maxTry = 10;
+                for (int i = 0; i < maxTry; i++)
+                {
+                    int marginLeft = (int)((double)fullImage.Width * i / 2.5 / maxTry);
+                    int marginTop = (int)((double)fullImage.Height * i / 2.5 / maxTry);
+                    Rectangle cropRect = new(marginLeft, marginTop, fullImage.Width - marginLeft * 2, fullImage.Height - marginTop * 2);
+                    Bitmap target = new(width, height);
+
+                    double imageScale = (double)width / (double)cropRect.Width;
+                    using (Graphics g = Graphics.FromImage(target))
+                    {
+                        g.DrawImage(fullImage, new Rectangle(0, 0, target.Width, target.Height),
+                                        cropRect,
+                                        GraphicsUnit.Pixel);
+                    }
+
+                    BitmapLuminanceSource source = new(target);
+                    QRCodeReader reader = new();
+
+                    BinaryBitmap bitmap = new(new HybridBinarizer(source));
+                    var result = reader.decode(bitmap);
+                    if (result != null)
+                    {
+                        return result.Text;
+                    }
+                    else
+                    {
+                        BinaryBitmap bitmap2 = new(new HybridBinarizer(source.invert()));
+                        var result2 = reader.decode(bitmap2);
+                        if (result2 != null)
+                        {
+                            return result2.Text;
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Logging.SaveLog(ex.Message, ex);
+            }
+            return string.Empty;
+        }
+
+        public static Tuple<float, float> GetDpiXY(Window window)
+        {
+            IntPtr hWnd = new WindowInteropHelper(window).EnsureHandle();
+            Graphics g = Graphics.FromHwnd(hWnd);
+
+            return new(96 / g.DpiX, 96 / g.DpiY);
+        }
     }
 }
\ No newline at end of file
diff --git a/v2rayN/v2rayN/Common/Utils.cs b/v2rayN/v2rayN/Common/Utils.cs
index abffbec1..286fac9e 100644
--- a/v2rayN/v2rayN/Common/Utils.cs
+++ b/v2rayN/v2rayN/Common/Utils.cs
@@ -18,10 +18,6 @@ using System.Windows;
 using System.Windows.Interop;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
-using ZXing;
-using ZXing.Common;
-using ZXing.QrCode;
-using ZXing.Windows.Compatibility;
 
 namespace v2rayN
 {
@@ -950,66 +946,6 @@ namespace v2rayN
 
         #endregion TempPath
 
-        #region scan screen
-
-        public static string ScanScreen(float dpiX, float dpiY)
-        {
-            try
-            {
-                var left = (int)(SystemParameters.WorkArea.Left);
-                var top = (int)(SystemParameters.WorkArea.Top);
-                var width = (int)(SystemParameters.WorkArea.Width / dpiX);
-                var height = (int)(SystemParameters.WorkArea.Height / dpiY);
-
-                using Bitmap fullImage = new Bitmap(width, height);
-                using (Graphics g = Graphics.FromImage(fullImage))
-                {
-                    g.CopyFromScreen(left, top, 0, 0, fullImage.Size, CopyPixelOperation.SourceCopy);
-                }
-                int maxTry = 10;
-                for (int i = 0; i < maxTry; i++)
-                {
-                    int marginLeft = (int)((double)fullImage.Width * i / 2.5 / maxTry);
-                    int marginTop = (int)((double)fullImage.Height * i / 2.5 / maxTry);
-                    Rectangle cropRect = new(marginLeft, marginTop, fullImage.Width - marginLeft * 2, fullImage.Height - marginTop * 2);
-                    Bitmap target = new(width, height);
-
-                    double imageScale = (double)width / (double)cropRect.Width;
-                    using (Graphics g = Graphics.FromImage(target))
-                    {
-                        g.DrawImage(fullImage, new Rectangle(0, 0, target.Width, target.Height),
-                                        cropRect,
-                                        GraphicsUnit.Pixel);
-                    }
-
-                    BitmapLuminanceSource source = new(target);
-                    BinaryBitmap bitmap = new(new HybridBinarizer(source));
-                    QRCodeReader reader = new();
-                    Result result = reader.decode(bitmap);
-                    if (result != null)
-                    {
-                        string ret = result.Text;
-                        return ret;
-                    }
-                }
-            }
-            catch (Exception ex)
-            {
-                Logging.SaveLog(ex.Message, ex);
-            }
-            return string.Empty;
-        }
-
-        public static Tuple<float, float> GetDpiXY(Window window)
-        {
-            IntPtr hWnd = new WindowInteropHelper(window).EnsureHandle();
-            Graphics g = Graphics.FromHwnd(hWnd);
-
-            return new(96 / g.DpiX, 96 / g.DpiY);
-        }
-
-        #endregion scan screen
-
         #region 开机自动启动等
 
         /// <summary>
diff --git a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
index c8b9dadc..f4417a14 100644
--- a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
@@ -1026,10 +1026,10 @@ namespace v2rayN.ViewModels
         {
             ShowHideWindow(false);
 
-            var dpiXY = Utils.GetDpiXY(Application.Current.MainWindow);
+            var dpiXY = QRCodeHelper.GetDpiXY(Application.Current.MainWindow);
             string result = await Task.Run(() =>
             {
-                return Utils.ScanScreen(dpiXY.Item1, dpiXY.Item2);
+                return QRCodeHelper.ScanScreen(dpiXY.Item1, dpiXY.Item2);
             });
 
             ShowHideWindow(true);