Avalonia 實現跨平臺的IM即時通訊、語音視訊通話（原始碼，支援信創國產OS，統信、銀河麒麟）

    public static class InformationTypes
    {
        /// <summary>
        /// 文字(表情)聊天資訊
        /// </summary>
        public const int TextChat = 0;

        /// <summary>
        /// 文字(表情)聊天資訊 (由伺服器端轉發給訊息接收方)
        /// </summary>
        public const int TextChat4Transit = 1;

        /// <summary>
        /// 圖片聊天資訊
        /// </summary>
        public const int ImageChat = 2;

        /// <summary>
        /// 收到訊息傳送者 撤回訊息請求
        /// </summary>
        public const int RecallMsg = 3;

        /// <summary>
        /// 使用者端非同步呼叫伺服器端
        /// </summary>
        public const int ClientSyncCallServer = 4;

        /// <summary>
        /// 視訊請求 5
        /// </summary>
        public const int VideoRequest = 5;

        /// <summary>
        /// 回覆視訊請求的結果 6
        /// </summary>
        public const int VideoResult = 6;

        /// <summary>
        /// 通知對方 結束通話 視訊連線 7
        /// </summary>
        public const int CloseVideo = 7;

        /// <summary>
        /// 通知好友 網路原因，導致 視訊中斷 8
        /// </summary>
        public const int NetReasonCloseVideo = 8;

        /// <summary>
        /// 通知對方(忙線中) 結束通話 視訊連線 9
        /// </summary>
        public const int BusyLine = 9;

        /// <summary>
        /// 收到遠端協助請求
        /// </summary>
        public const int AssistReceive = 10;

        /// <summary>
        /// 協助方拒絕遠端協助
        /// </summary>
        public const int AssistGusetReject = 11;

        /// <summary>
        /// 協助方同意遠端協助
        /// </summary>
        public const int AssistGusetAgree = 12;

        /// <summary>
        /// 請求方關閉遠端協助
        /// </summary>
        public const int AssistOwnerClose = 13;

        /// <summary>
        /// 協助方關閉遠端協助
        /// </summary>
        public const int AssistGusetClose = 14;
    }

    public class ChatMessageRecord
    {
        public string Guid { get; set; }

        public DateTime MessageTime { get; set; }

        public string SpeakerID { get; set; }

        public string ListenerID { get; set; }

        public ChatMessageType ChatMessageType { get; set; }

        public string ContentStr { get; set; }

        public byte[] ImgData { get; set; }

        public string FilePath { get; set; }
    }

  void HandleInformation(string sourceUserID, int informationType, byte[] info);

  byte[] HandleQuery(string sourceUserID, int informationType, byte[] info);

    public class BasicHandler : IBasicHandler
    { 
        /// <summary>
        /// 此處驗證使用者的賬號和密碼。返回true表示通過驗證。
        /// </summary>  
        public bool VerifyUser(ClientType clientType, string systemToken, string userID, string password, out string failureCause)
        {
            failureCause = "";
            return true;
        }

        public string HandleQueryBeforeLogin(AgileIPE clientAddr, int queryType, string query)
        {
            return "";
        }
    }

        internal static void SendTextMsgToClient(ChatMessageRecord record)
        {
            try
            {
                string cont = JsonConvert.SerializeObject(record);
                byte[] recordInfo = Encoding.UTF8.GetBytes(cont);
                //使用Tag攜帶 接收者的ID
                App.PassiveEngine.CustomizeOutter.Send(record.ListenerID, InformationTypes.TextChat4Transit, recordInfo);
            }
            catch (Exception e)
            {
                logger.Log(e, "GlobalHelper.SendTextMsgToClient", ErrorLevel.Standard);
            }
        }

        protected override void OnInitialized()
        {
            base.OnInitialized(); 
            this.SetWindowStats();
            if (!this.IsWorking)
            {
                VideoController.Singleton.SendMessage(this.DestID, InformationTypes.VideoRequest, null);
                CommonHelper.AddSystemMsg(this.DestID, "向對方發起視訊通話邀請");
            }
        }

        internal void BeginConnect()
        {
            UiSafeInvoker.ActionOnUI(() =>
            {
                string tip = this.IsWorking ? "已同意對方的視訊通話" : "對方同意了你的視訊通話請求";
                CommonHelper.AddSystemMsg(this.DestID, tip);
                this.IsWorking = true;
                this.NotifyOther = true;
                this.Title = this.title.Text = this.RepeatedCallTip(false);
                this.startTime = DateTime.Now;
                this.timer.Start();
                this.otherCamera.Core.DisplayVideoParameters = true;
                this.otherCamera.Core.VideoDrawMode = VideoDrawMode.ScaleToFill;
                this.otherCamera.Core.ConnectEnded += DynamicCameraConnector_ConnectEnded;
                this.otherCamera.Core.Disconnected += DynamicCameraConnector_Disconnected;
                this.microphoneConnector.ConnectEnded += MicrophoneConnector_ConnectEnded;
                this.microphoneConnector.Disconnected += MicrophoneConnector_Disconnected;
                this.otherCamera.BeginConnect(this.DestID);
                this.microphoneConnector.BeginConnect(this.DestID);
            });
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);
            this.otherCamera?.Disconnect();
            this.otherCamera?.Dispose();

            this.microphoneConnector?.Disconnect();
            this.microphoneConnector?.Dispose();

            this.selfCamera?.Disconnect();
            this.selfCamera?.Dispose();
        }