修复多个未使用字段和变量的编译器警告

Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs

@@ -190,8 +190,6 @@ namespace JoyD.Windows.CS.Toprie
         private System.Threading.Timer _reconnectTimer;
         // 重连间隔（毫秒）
         private int _reconnectInterval = 2000;
-        // 重连尝试次数
-        private int _reconnectAttempts = 0;
         // 最大重连尝试次数
         public static int MaxReconnectAttempts = 5;
         // 连接检查定时器
@@ -210,12 +208,7 @@ namespace JoyD.Windows.CS.Toprie
         private const int DataReceivedTimeout = 15000; // 15秒内未收到数据则认为连接可能断开
         // TCP客户端
         // 该变量已在文件上方定义，删除重复实现
-        // 网络流
-        private NetworkStream _imageNetworkStream;
-        // 图像接收任务
-        private Task _imageReceivingTask;
-        // 取消令牌源
-        private CancellationTokenSource _imageReceivingCts;
+
         // 停止请求事件
         private ManualResetEvent _stopRequested = new ManualResetEvent(false);
         // 缓冲区
@@ -1597,7 +1590,6 @@ namespace JoyD.Windows.CS.Toprie
             }
         
             Log("开始使用HTTP方式接收图像数据");
-            bool existed = false;
             try
             {
                 // 确保之前的连接已关闭

Windows/CS/Framework4.0/Toprie/Toprie/V8.cs

@@ -130,14 +130,12 @@ namespace JoyD.Windows.CS.Toprie
         // 私有字段
         private string deviceIp;
         private Socket socket;
-        private bool isConnected;
         private static bool isSdkInitialized = false;
         private static Dictionary<string, V8> deviceInstances = new Dictionary<string, V8>();
 
         public V8(string ip)
         {
             deviceIp = ip;
-            isConnected = false;
         }
 
         ~V8()