paul said:
Hi,
Is it possible create a function that I can call like msDelay(2) to
run a 2 millisecond delay?
The Thread.Sleep function cannot go below 10ms...
paul, I just tried several ways to attempt to solve this.
The first was to use a Timer object and call the tick on 2 ms.
I have a simple application that uses two TextBoxes to show the start
and stop times, and a third for the difference. A button kicks this all off.
However, the difference would always hit at about 15.6 or 31 ms.
So, I tried to take matters into my own hands. I would continue to poll
the DateTime.Now object until my difference was just above 2 ms. Well,
I could get 0 or 15.6 ms. I think that the DateTime.Now object, and
hence perhaps the .NET Runtime can only handle so fine of a tuning for
timing purposes.
While you could get close to the second or minute pretty accurately, it
would seem that the .NET Runtime is not very well suited for Real-time
and High-Precision timing tasks.
Below is the code I was using to try out some of these ideas. It is
Form1.cs from a standard WinForms template in Visual Studio.
<!-- ----------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication2
{
public partial class Form1 : Form
{
#region Form1.Designer.cs
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be
disposed; otherwise, false.</param>
protected override void Dispose( bool disposing )
{
if ( disposing && (components != null) )
{
components.Dispose();
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.timer1 = new System.Windows.Forms.Timer( this.components );
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.textBox3 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// timer1
//
this.timer1.Interval = 2;
//
// button1
//
this.button1.Location = new System.Drawing.Point( 12, 12 );
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size( 50, 46 );
this.button1.TabIndex = 0;
this.button1.Text = "Go!";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler( this.button1_Click );
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point( 68, 12 );
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size( 183, 20 );
this.textBox1.TabIndex = 1;
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point( 68, 38 );
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size( 183, 20 );
this.textBox2.TabIndex = 2;
//
// textBox3
//
this.textBox3.Font = new System.Drawing.Font( "Microsoft Sans Serif",
26F, System.Drawing.FontStyle.Regular,
System.Drawing.GraphicsUnit.Point, ((byte)(0)) );
this.textBox3.Location = new System.Drawing.Point( 258, 12 );
this.textBox3.Name = "textBox3";
this.textBox3.Size = new System.Drawing.Size( 77, 47 );
this.textBox3.TabIndex = 3;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF( 6F, 13F );
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size( 347, 68 );
this.Controls.Add( this.textBox3 );
this.Controls.Add( this.textBox2 );
this.Controls.Add( this.textBox1 );
this.Controls.Add( this.button1 );
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout( false );
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Timer timer1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.TextBox textBox3;
#endregion
public Form1()
{
InitializeComponent();
timer1.Tick += new EventHandler( timer1_Tick );
}
double start,stop,difference;
#region Method 1 (~15-30 ms)
//void timer1_Tick( object sender, EventArgs e )
//{
// timer1.Stop();
// stop = DateTime.Now.TimeOfDay.TotalMilliseconds;
// difference = stop - start;
// textBox1.Text = start.ToString();
// textBox2.Text = stop.ToString();
// textBox3.Text = difference.ToString();
//}
//private void button1_Click( object sender, EventArgs e )
//{
// start = DateTime.Now.TimeOfDay.TotalMilliseconds;
// timer1.Start();
//}
#endregion
#region Method 2
void timer1_Tick( object sender, EventArgs e )
{
}
private void button1_Click( object sender, EventArgs e )
{
start = DateTime.Now.TimeOfDay.TotalMilliseconds;
//int i = 0; // B
do
{
stop = DateTime.Now.TimeOfDay.TotalMilliseconds;
difference = stop - start;
} while ( difference < 2 ); // A
// i++; // B
//} while ( i < 6000 ); // B
textBox1.Text = start.ToString();
textBox2.Text = stop.ToString();
textBox3.Text = difference.ToString();
}
#endregion
}
}
---------------------------------------- -->
