C#的问题，求高手相助啊！！！在线等

Question

 public  void btnTakePhotos_Click(object sender, EventArgs e)    //截图
           {
               btnTakePhotos.Text = "抓拍";
               
               RobotEngine2.TakePhoto(cameraWindow.Camera.LastFrame, ImagePath, CreatePictureFile());
           }
红字的这段，在调试的时候弹出“未处理NullReferenceException”
而且我RobotEngine2为null
而我看别人的程序是RobotEngine2为｛WIFIRobotCMDEngineV2.WifiRobotCMDEngineV2｝
请问我要怎么才能不为null？
WIFIRobotCMDEngineV2是引入的dll控件，我在引用中已经引用进去了，也用了using了，
而且也public WifiRobotCMDEngineV2 RobotEngine2;//实例化引擎了
求救啊！！！

Answer 1

我觉得TakePhoto应该不是静态方法，你没有实例化具体对象应该如下吧  RobotEngine2=new WifiRobotCMDEngineV2();//实例化对象
  RobotEngine2.TakePhoto(cameraWindow.Camera.LastFrame, ImagePath, CreatePictureFile());

Answer 2

代码好长呃。放出来好恶心呃。。
我复制出来吧，求解救
using WIFIRobotCMDEngineV2;
  static string ImagePath = Application.StartupPath + "\\Snapshot\\";//截图
 public WifiRobotCMDEngineV2 RobotEngine2;//实例化引擎/// ////////////////////////////////////////////////截图//////
            public  void camera_NewFrame(object sender, System.EventArgs e)
            {
                if (saveOnMotion == true)
                {
                    Camera camera = cameraWindow.Camera;
                    camera.Lock();
                    writer.AddFrame(camera.LastFrame);
                    camera.Unlock();
                }
                else
                {
                    if (writer != null)
                    { 
                        writer.Dispose();
                        writer = null;
                    }                }
            }            public string CreatePictureFile()
            {
                DateTime date = DateTime.Now;
                string fileName = string.Format("{0}-{1}-{2} {3}-{4}-{5}.bmp",
                    date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second);
                return fileName;
            }
            
        
           public  void btnTakePhotos_Click(object sender, EventArgs e)    //截图
           {
               btnTakePhotos.Text = "抓拍";
               
               RobotEngine2.TakePhoto(cameraWindow.Camera.LastFrame, ImagePath, CreatePictureFile());
           }
应该没有缺了，这是关于截图的

Answer 3

那你要看一下WifiRobotCMDEngineV2的构造函数是什么啊

Answer 4

光标放在括号中，然后快捷键 同时按ctr+shift+空格，查看构造函数的重载参数也可以选中括号前面的WifiRobotCMDEngineV2，即RobotEngine2=new WifiRobotCMDEngineV2();红色部分，右键->转到定义，查看构造函数

Answer 5

using System;
using System.Drawing;
using System.IO.Ports;
using System.Net;
using System.Net.Sockets;namespace WIFIRobotCMDEngineV2
{
    public class WifiRobotCMDEngineV2
    {
        public WifiRobotCMDEngineV2(object cor);        public IPEndPoint IPE { get; set; }
        public Socket SOCKET { get; set; }        public event WifiRobotCMDEngineV2.SetRadarValue Setradarvalue;        public string byteToHexStr(byte[] bytes);
        public byte[] CreateData(byte type, byte cmd, byte data);
        public static string Domain2ip(string str);
        public void DrawSignal(int signalType, Graphics g, int x, int y, int PenWidth);
        public byte[] HexStringToByteArray(string s);
        public void SendCMD(int controlType, byte[] byteData, SerialPort comm);
        public void SendCMD(int controlType, string CMD_Custom, SerialPort comm);
        public void SendDataInComm(SerialPort comm, byte[] data);
        public void SendDataInComm(SerialPort comm, string data);
        public void SendHeartCMD(int controlType, SerialPort comm);
        public bool SocketConnect();
        public void TakePhoto(Bitmap snapshot, string RootPath, string FileName);        public delegate void SetRadarValue(string radarvalue);
    }
}
是这个吗？然后要怎么做呢？谢谢

Answer 6

没看到么，构造函数中包含一个参数，是object类型的   public WifiRobotCMDEngineV2(object cor);如果没有参数传递，可以传递为null，如下
RobotEngine2=new WifiRobotCMDEngineV2(null);//实例化对象如果有参数，那么传递相应参数就可以，比如字符串
RobotEngine2=new WifiRobotCMDEngineV2("参数");//实例化对象

Answer 7

   public MainForm()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            RobotEngine2 = new WifiRobotCMDEngineV2((Object)this.statusBar); 
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
是不是要加上这个？别人的程序里有这个东西，可是我打上去运行时有错误，”未处理ArgumentOutOfRangeException   索引超出范围，必须为非负值并小于集合大小。参数名：index。”是这句的问题吗？如果是缺这句的话改怎么解决？

Answer 8

我又有问题了，求救啊
            bool ret = false;
            private bool InitWIFISocket(String controlIp, String port)
            {
                
                this.Systemstatus.Text = "正在尝试连接WIFI板···";                try
                {
                   RobotEngine2 = new WifiRobotCMDEngineV2(socket );
                   RobotEngine2 = new WifiRobotCMDEngineV2(ipe);
                    RobotEngine2 = new WifiRobotCMDEngineV2(ret);
                    RobotEngine2 = new WifiRobotCMDEngineV2(ips);
                    RobotEngine2 = new WifiRobotCMDEngineV2(controlIp);
                    RobotEngine2 = new WifiRobotCMDEngineV2(port );
                    RobotEngine2 = new WifiRobotCMDEngineV2(SocketType.Stream );
                    RobotEngine2 = new WifiRobotCMDEngineV2(ProtocolType.Tcp);
                    RobotEngine2 = new WifiRobotCMDEngineV2(AddressFamily.InterNetwork);
                    RobotEngine2   = new WifiRobotCMDEngineV2(RobotEngine2.IPE  );
                    RobotEngine2  = new WifiRobotCMDEngineV2(RobotEngine2 .SOCKET );                    ips = IPAddress.Parse(controlIp.ToString());
                    ipe = new IPEndPoint(ips, Convert.ToInt32(port.ToString()));
                    socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);                    RobotEngine2.SOCKET = socket;
                    RobotEngine2.IPE = ipe;
                    ret = RobotEngine2.SocketConnect();                }
                catch (Exception e)
                {                    MessageBox.Show("WIFI初始化失败：" + e.Message, "WIFI初始化失败提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                return ret;
            }
我已经实例化了RobotEngine2.SOCKET和RobotEngine2.IPE了，为什么调试的时候我发现socket无法赋值给RobotEngine2.SOCKET,ipe无法赋值给RobotEngine2.IPE?而且RobotEngine2.SOCKET和RobotEngine2.IPE都为null，这是什么问题？

Answer 9

  bool ret = false;
  private bool InitWIFISocket(String controlIp, String port)
  {
    
  this.Systemstatus.Text = "正在尝试连接WIFI板···";  try
  {
  RobotEngine2 = new WifiRobotCMDEngineV2(socket );
  RobotEngine2 = new WifiRobotCMDEngineV2(ipe);
  RobotEngine2 = new WifiRobotCMDEngineV2(ret);
  RobotEngine2 = new WifiRobotCMDEngineV2(ips);
  RobotEngine2 = new WifiRobotCMDEngineV2(controlIp);
  RobotEngine2 = new WifiRobotCMDEngineV2(port );
  RobotEngine2 = new WifiRobotCMDEngineV2(SocketType.Stream );
  RobotEngine2 = new WifiRobotCMDEngineV2(ProtocolType.Tcp);
  RobotEngine2 = new WifiRobotCMDEngineV2(AddressFamily.InterNetwork);
  RobotEngine2 = new WifiRobotCMDEngineV2(RobotEngine2.IPE );
  RobotEngine2 = new WifiRobotCMDEngineV2(RobotEngine2 .SOCKET );  ips = IPAddress.Parse(controlIp.ToString());
  ipe = new IPEndPoint(ips, Convert.ToInt32(port.ToString()));
  socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);  RobotEngine2.SOCKET = socket;
  RobotEngine2.IPE = ipe;
  ret = RobotEngine2.SocketConnect();  }
  catch (Exception e)
  {  MessageBox.Show("WIFI初始化失败：" + e.Message, "WIFI初始化失败提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
  }
  return ret;
  }
我已经实例化了RobotEngine2.SOCKET和RobotEngine2.IPE了，为什么调试的时候我发现socket无法赋值给RobotEngine2.SOCKET,ipe无法赋值给RobotEngine2.IPE?而且RobotEngine2.SOCKET和RobotEngine2.IPE都为null，这是什么问题？
我把能实例化的都弄了，为什么还是空？