Thread: updating a label with a timer event

hi ppl

setup < windows xp , microsoft c# .NET >

im trying to update a label on a form without any button click (or any user event) , the event that should update the label is a timer in a seperate class from the label, the code follows:

Code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;


namespace TrafficControlSim
{
	// Summary description for Form1.
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		// Required designer variable.
		private System.ComponentModel.Container components = null;
		private TrafficFlowSimulator trafficflowsim;
		private static int num;


		public Form1()
		{
			// Required for Windows Form Designer support
			InitializeComponent();
			trafficflowsim = new TrafficFlowSimulator();
			// TODO: Add any constructor code after InitializeComponent call
		
		}

		// Clean up any resources being used.
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		
		// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(16, 344);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(120, 56);
			this.label1.TabIndex = 0;
			this.label1.Text = "THIS IS THE OBJECT I WANNA UPDATE";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(592, 516);
			this.Controls.Add(this.label1);
			this.Name = "Form1";
			this.Text = "Traffic Control Simulator";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.ResumeLayout(false);

		}
		#endregion

		
		
		public void displaytext_timer(String a)
		{
		
		
		}
		
		// The main entry point for the application.
		[STAThread]
		static void Main() 
		{
			
			TrafficFlowSimulator trafficSimulator = new TrafficFlowSimulator("H:\\NorthTraffic.txt",
				"H:\\SouthTraffic.txt");
			
			Application.Run(new Form1());
			
			
		}

		public void Form1_Load(object sender, System.EventArgs e)
		{
			// convert int to string
		    num = trafficflowsim.getTimeIndex();
			num.ToString();
			label1.Text = "num"; 
		}

		

		
	}//end Form1 class

}//end namespace

and the other class is:

Code:

using System;
using System.IO;
//using System.Threading;
using System.Timers;
using System.Collections;

namespace TrafficControlSim
{
	public class TrafficFlowSimulator
	{
		private  System.Timers.Timer oneSecondTimer; 
		private  TrafficQueue northQueue,southQueue;
		private  TrafficSensor northSensor,southSensor;
		private  static int timeIndex;
		private  Random random;
		private string fileText;
		private Form1 form;
		 
	

		public TrafficFlowSimulator(string north, string south)
		{
			try
			{
				northSensor = new TrafficSensor(north);
				southSensor = new TrafficSensor(south);
				oneSecondTimer= new System.Timers.Timer();
				northQueue = new TrafficQueue(15);
				southQueue = new TrafficQueue(15);
				oneSecondTimer.Elapsed += new ElapsedEventHandler(OnOneSecond);
				oneSecondTimer.Interval = 1000;
				oneSecondTimer.Enabled = true;
				fileText = "queue";
				timeIndex = 0;
				random = new Random();
				form = new Form1();
				
				
			}
			catch (Exception e)
			{
				Console.WriteLine("Could not initialise traffic simulator. "+e);
			}
		}

		public TrafficFlowSimulator()
		{
		}

		public void OnOneSecond(Object source, ElapsedEventArgs e)
		{
			timeIndex++;
			if (timeIndex%7==0)
				CheckTrafficSensors();
			Console.WriteLine("Sim time: " + timeIndex + " seconds");
			form.Form1_Load(source, e);
			if (timeIndex==120)
			{
				Console.WriteLine("Press q to quit");
				oneSecondTimer.Enabled=false;
				oneSecondTimer.Dispose();
			}
			else
			{
				Console.WriteLine("Traffic Queue North has "+northQueue.TrafficQueueSize() +" vehicles in, namely");
				northQueue.TrafficInQueue();
				Console.WriteLine();
				
				Console.WriteLine("Traffic Queue South has "+southQueue.TrafficQueueSize() +" vehicles in, namely");
				southQueue.TrafficInQueue();
				Console.WriteLine();
			}
		}

		public void CheckTrafficSensors()
		{
			fileText = northSensor.ReadTrafficSensor();
			if (fileText.Equals("car"))
			{
				Car aCar = new Car();
				aCar.SetVehicleType("car");
				northQueue.Arrive(aCar);
			}
			if (fileText.Equals("lorry"))
			{
				Lorry aLorry = new Lorry();
				aLorry.SetVehicleType("Lorry");
				northQueue.Arrive(aLorry);
			}
			fileText = southSensor.ReadTrafficSensor();
			if (random.NextDouble()<0.5)
			{
				if (fileText.Equals("car"))
				{
					Car aCar = new Car();
					aCar.SetVehicleType("car");
					southQueue.Arrive(aCar);
				}
				if (fileText.Equals("lorry"))
				{
					Lorry aLorry = new Lorry();
					aLorry.SetVehicleType("Lorry");
					southQueue.Arrive(aLorry);
				}		
			}
	
	
		}// end CheckTrafficSensors

		public int getTimeIndex()
		{
			return timeIndex;
		}

	}//end class TrafficFlowSimulator

}//end namespace

the Form1_Load does get called on every iteration of the timer but the form label never changes from the 1st text label ..ie num

thanks in advance

luigi

yes i see what you mean, i was still output the string, however the label doesnt update on every iteration, i tried the label1.Invalidate after label1.Text = ""+num; to no avail

yes i just ran the program, placed a bp at

label1.Text = ""+num;

statement at which point num increments by one on every timer iteration, the int just isnt being passed to the label1 object

im going read around a little

i would be grateful for any feedback

tahnks in advance