add:issue #181

Ink Canvas/Helpers/FileAssociationManager.cs

@@ -24,6 +24,7 @@ namespace Ink_Canvas.Helpers
         private const string IpcMutexName = "InkCanvasFileAssociationIpc";
         private const string IpcEventName = "InkCanvasFileAssociationEvent";
         private const string IpcFilePrefix = "InkCanvasFileAssociation_";
+        private const string IpcBoardModePrefix = "InkCanvasBoardMode_";
         private const int IpcTimeout = 5000; // 5秒超时
 
         /// <summary>
@@ -259,6 +260,56 @@ namespace Ink_Canvas.Helpers
             }
         }
 
+        /// <summary>
+        /// 尝试通过IPC将白板模式命令发送给已运行的实例
+        /// </summary>
+        /// <returns>是否成功发送</returns>
+        public static bool TrySendBoardModeCommandToExistingInstance()
+        {
+            try
+            {
+                LogHelper.WriteLogToFile("尝试通过IPC发送白板模式命令给已运行实例", LogHelper.LogType.Event);
+
+                // 创建IPC文件
+                string tempDir = Path.GetTempPath();
+                string ipcFileName = IpcBoardModePrefix + Guid.NewGuid().ToString("N") + ".tmp";
+                string ipcFilePath = Path.Combine(tempDir, ipcFileName);
+
+                // 写入白板模式命令到IPC文件
+                File.WriteAllText(ipcFilePath, "BOARD_MODE", Encoding.UTF8);
+
+                // 创建事件通知已运行实例
+                using (EventWaitHandle ipcEvent = new EventWaitHandle(false, EventResetMode.ManualReset, IpcEventName))
+                {
+                    ipcEvent.Set();
+                }
+
+                // 等待一段时间让已运行实例处理命令
+                Thread.Sleep(1000);
+
+                // 清理IPC文件
+                try
+                {
+                    if (File.Exists(ipcFilePath))
+                    {
+                        File.Delete(ipcFilePath);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    LogHelper.WriteLogToFile($"清理IPC文件失败: {ex.Message}", LogHelper.LogType.Warning);
+                }
+
+                LogHelper.WriteLogToFile("IPC白板模式命令发送完成", LogHelper.LogType.Event);
+                return true;
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"通过IPC发送白板模式命令失败: {ex.Message}", LogHelper.LogType.Error);
+                return false;
+            }
+        }
+
         /// <summary>
         /// 启动IPC监听器，等待其他实例发送文件路径
         /// </summary>
@@ -317,8 +368,9 @@ namespace Ink_Canvas.Helpers
             try
             {
                 string tempDir = Path.GetTempPath();
+                
+                // 处理文件路径IPC文件
                 string[] ipcFiles = Directory.GetFiles(tempDir, IpcFilePrefix + "*.tmp");
-
                 foreach (string ipcFile in ipcFiles)
                 {
                     try
@@ -367,6 +419,57 @@ namespace Ink_Canvas.Helpers
                         catch { }
                     }
                 }
+
+                // 处理白板模式命令IPC文件
+                string[] boardModeFiles = Directory.GetFiles(tempDir, IpcBoardModePrefix + "*.tmp");
+                foreach (string ipcFile in boardModeFiles)
+                {
+                    try
+                    {
+                        // 读取命令内容
+                        string command = File.ReadAllText(ipcFile, Encoding.UTF8);
+
+                        if (command == "BOARD_MODE")
+                        {
+                            LogHelper.WriteLogToFile("IPC接收到白板模式命令", LogHelper.LogType.Event);
+
+                            // 在UI线程中处理白板模式切换
+                            Application.Current.Dispatcher.BeginInvoke(new Action(() =>
+                            {
+                                try
+                                {
+                                    // 获取主窗口并切换到白板模式
+                                    if (Application.Current.MainWindow is MainWindow mainWindow)
+                                    {
+                                        mainWindow.SwitchToBoardMode();
+                                        mainWindow.ShowNotification("已切换到白板模式");
+                                    }
+                                }
+                                catch (Exception ex)
+                                {
+                                    LogHelper.WriteLogToFile($"IPC处理白板模式切换失败: {ex.Message}", LogHelper.LogType.Error);
+                                }
+                            }));
+                        }
+
+                        // 删除IPC文件
+                        File.Delete(ipcFile);
+                    }
+                    catch (Exception ex)
+                    {
+                        LogHelper.WriteLogToFile($"处理白板模式IPC文件失败: {ex.Message}", LogHelper.LogType.Warning);
+
+                        // 尝试删除损坏的IPC文件
+                        try
+                        {
+                            if (File.Exists(ipcFile))
+                            {
+                                File.Delete(ipcFile);
+                            }
+                        }
+                        catch { }
+                    }
+                }
             }
             catch (Exception ex)
             {