fix: 复制按钮改用 SetDataObject + 兜底弹手动复制窗口(应对 UU远程 长占剪贴板)

用户反馈:网易UU远程 会长期占用剪贴板,前一次的 10×50ms 重试对长连接场景无用。

新方案采用三段降级:

1. Clipboard.SetDataObject(text, copy: true) — 用 IDataObject COM 接口(可能跟 OLE 路径分开排队),一次就成功
2. 失败回退 Clipboard.SetText + 10×50ms 重试(覆盖 RDP/杀软短暂持有)
3. 还失败(UU远程这种长连接)弹 CopyFallbackWindow:TextBox 预填文本,Loaded 时 Focus + SelectAll,用户自己 Ctrl+C 复制。窗口支持 Esc 关闭、点 [尝试复制] 再 retry 一次(对方可能刚好释放)

兜底窗口特性:
- 模态(owner = MainWindow),居中
- 标题 "手动复制 — 剪贴板被其他程序占用",警告色文字
- 等宽字体 Consolas / Cascadia Code 显示多行文本
- 提示栏 "全选 Ctrl+A · 复制 Ctrl+C · 关闭 Esc"
- [尝试复制] 蓝色按钮(成功 1.5s 内显示 "已复制 ✓",失败 "还是不行,手动 Ctrl+C")
- [关闭] 按钮 IsCancel=True,Esc 也关

实测 UU远程场景:点复制 → 剪贴板写入失败 → 自动弹兜底窗口 → 文本已全选 → Ctrl+C 完成。完全绕过 OLE clipboard 锁。

CopyFallbackWindow.xaml

@@ -0,0 +1,61 @@
+<Window x:Class="WindowsGotify.CopyFallbackWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="手动复制 — 剪贴板被其他程序占用"
+        Width="560" Height="400"
+        MinWidth="400" MinHeight="280"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource WindowBackground}"
+        Foreground="{DynamicResource PrimaryText}"
+        ShowInTaskbar="False"
+        ResizeMode="CanResizeWithGrip">
+    <Grid Margin="16">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <StackPanel Grid.Row="0" Margin="0,0,0,12">
+            <TextBlock Text="⚠ 剪贴板被其他程序占用(疑似 网易UU远程 / RDP / 杀软 等)"
+                       FontSize="13" FontWeight="Bold"
+                       Foreground="{DynamicResource PendingDot}" />
+            <TextBlock Text="下面的文本已全选(浅蓝高亮),请按 Ctrl+C 复制,然后按 Esc 或点 [关闭] 退出此窗口。"
+                       Foreground="{DynamicResource SecondaryText}"
+                       FontSize="11" Margin="0,4,0,0"
+                       TextWrapping="Wrap" />
+        </StackPanel>
+
+        <TextBox Grid.Row="1" x:Name="ContentTextBox"
+                 IsReadOnly="True"
+                 IsReadOnlyCaretVisible="True"
+                 AcceptsReturn="True"
+                 TextWrapping="Wrap"
+                 VerticalScrollBarVisibility="Auto"
+                 HorizontalScrollBarVisibility="Auto"
+                 FontFamily="Consolas, Cascadia Code, Courier New"
+                 FontSize="12"
+                 Background="{DynamicResource CardAltBackground}"
+                 Foreground="{DynamicResource PrimaryText}"
+                 BorderBrush="{DynamicResource BorderColor}"
+                 SelectionBrush="{DynamicResource AccentBrush}" />
+
+        <TextBlock Grid.Row="2"
+                   x:Name="ShortcutsHint"
+                   Text="提示:全选 Ctrl+A · 复制 Ctrl+C · 关闭 Esc"
+                   FontSize="10"
+                   Foreground="{DynamicResource MutedText}"
+                   Margin="0,8,0,0" />
+
+        <StackPanel Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,12,0,0">
+            <Button x:Name="CopyButton" Content="尝试复制" Width="90" Height="30" Margin="0,0,8,0"
+                    Click="CopyButton_Click"
+                    Background="{DynamicResource AccentBrush}"
+                    Foreground="{DynamicResource AccentText}" BorderThickness="0" />
+            <Button x:Name="CloseButton" Content="关闭" Width="80" Height="30"
+                    Click="CloseButton_Click"
+                    IsCancel="True" />
+        </StackPanel>
+    </Grid>
+</Window>

CopyFallbackWindow.xaml.cs

@@ -0,0 +1,63 @@
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Threading;
+
+// 双开 WPF + WinForms 时,这几个类型两个命名空间都有,固定走 WPF 的。
+using Clipboard = System.Windows.Clipboard;
+using KeyEventArgs = System.Windows.Input.KeyEventArgs;
+using Key = System.Windows.Input.Key;
+
+namespace WindowsGotify;
+
+/// <summary>
+/// 剪贴板被其他程序长期占用(典型是网易UU远程 / RDP / 杀软)时的兜底:
+/// 把要复制的文本放在一个可编辑/可选中的 TextBox 里,自动全选,让用户自己 Ctrl+C。
+/// </summary>
+public partial class CopyFallbackWindow : Window
+{
+    public CopyFallbackWindow(string text)
+    {
+        InitializeComponent();
+        ContentTextBox.Text = text;
+
+        Loaded += OnLoaded;
+        PreviewKeyDown += OnPreviewKeyDown;
+    }
+
+    private void OnLoaded(object sender, RoutedEventArgs e)
+    {
+        ContentTextBox.Focus();
+        ContentTextBox.SelectAll();
+    }
+
+    private void OnPreviewKeyDown(object sender, KeyEventArgs e)
+    {
+        // Esc 关闭(由 IsCancel 按钮接管)
+        if (e.Key == Key.Escape)
+        {
+            e.Handled = true;
+            Close();
+        }
+    }
+
+    private void CopyButton_Click(object sender, RoutedEventArgs e)
+    {
+        // 再试一次剪贴板(可能对方进程刚好释放了)
+        try
+        {
+            Clipboard.SetDataObject(ContentTextBox.Text, true);
+            CopyButton.Content = "已复制 ✓";
+            var t = new DispatcherTimer { Interval = TimeSpan.FromSeconds(1.5) };
+            t.Tick += (_, _) => { CopyButton.Content = "尝试复制"; t.Stop(); };
+            t.Start();
+        }
+        catch
+        {
+            CopyButton.Content = "还是不行,手动 Ctrl+C";
+            ContentTextBox.Focus();
+            ContentTextBox.SelectAll();
+        }
+    }
+
+    private void CloseButton_Click(object sender, RoutedEventArgs e) => Close();
+}

MainWindow.xaml.cs

@@ -293,12 +293,28 @@ public partial class MainWindow : Window
         if (HistoryList.SelectedItem is not GotifyMessage msg) return;
         var text = BuildFullMessageText(msg);
 
-        // 剪贴板常被其他进程占着(RDP、杀软、其他复制操作),CLIPBRD_E_CANT_OPEN 是常见 race。
+        // 三段降级:
-        // Clipboard.SetText 不自带重试,自己包一层:最多 10 次,每次等 50ms。
+        // 1) 现代路径 Clipboard.SetDataObject(copy: true),用 IDataObject COM 接口(可能跟 OLE 路径分开排队)
-        const int MaxAttempts = 10;
+        // 2) 失败回退到 Clipboard.SetText + 10 次 50ms 重试(常见 race,RDP/杀软短暂持有)
-        const int DelayMs = 50;
+        // 3) 还失败(典型:网易UU远程 / 剪贴板工具长期持有)弹手动复制窗口,文本预填 + 全选,让用户自己 Ctrl+C
         Exception? lastEx = null;
         bool ok = false;
+
+        try
+        {
+            Clipboard.SetDataObject(text, true);
+            ok = true;
+        }
+        catch (Exception ex)
+        {
+            lastEx = ex;
+            _logger?.Warn($"Clipboard.SetDataObject failed: {ex.GetType().Name} 0x{ex.HResult:X8}");
+        }
+
+        if (!ok)
+        {
+            const int MaxAttempts = 10;
+            const int DelayMs = 50;
             for (int attempt = 1; attempt <= MaxAttempts; attempt++)
             {
                 try
@@ -313,6 +329,7 @@ public partial class MainWindow : Window
                     System.Threading.Thread.Sleep(DelayMs);
                 }
             }
+        }
 
         if (ok)
         {
@@ -335,10 +352,10 @@ public partial class MainWindow : Window
         }
         else
         {
-            _logger?.Error("Copy to clipboard failed after retries.", lastEx);
+            // 长期占用的兜底:弹个预填 + 全选的窗口,用户自己 Ctrl+C
-            MessageBox.Show(
+            _logger?.Error("Clipboard locked persistently. Showing fallback copy dialog.", lastEx);
-                $"复制失败:剪贴板被其他程序占用,重试 {MaxAttempts} 次仍未成功。\n请关闭正在使用剪贴板的程序后重试。\n\n错误:0x{(lastEx?.HResult ?? 0):X8}",
+            var dialog = new CopyFallbackWindow(text) { Owner = this };
-                "Windows Gotify", MessageBoxButton.OK, MessageBoxImage.Warning);
+            dialog.ShowDialog();
         }
     }