Csharp/C Sharp/Event/Key Event

Материал из .Net Framework эксперт
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Alt key pressed

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {

  [DllImport("User32.dll")]
  private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); 
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label lbl;
 private System.Windows.Forms.Button cmdAsyncState;
 public Form1() {
       InitializeComponent();
 }
 private void Form1_KeyPress(object sender, KeyPressEventArgs e)
 {
   e.Handled = true;
 }
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
   lbl.Text = "Key Down: " + e.KeyValue.ToString();
   lbl.Text += "\nKey Code: " + e.KeyCode.ToString();
   lbl.Text += "\nKey Data: " + e.KeyData.ToString();
   if ((e.Modifiers & Keys.Shift) == Keys.Shift)
   {
     lbl.Text += "\n" + "Shift was held down.";
   }
   if ((e.Modifiers & Keys.Control) == Keys.Control)
   {
     lbl.Text += "\n" + "Control was held down.";
   }
   if (e.Alt)
   {
     lbl.Text += "\n" + "Alt was held down.";
   }
 }
 private void cmdAsyncState_Click(object sender, EventArgs e)
 {
   int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString());
   switch (state)
   {
     case 0:
       lbl.Text = "A has not been pressed since the last call.";
       break;
     case 1:
       lbl.Text = "A is not currently pressed, but has been pressed since the last call.";
         break;
     case -32767:
       lbl.Text = "A is currently pressed.";
       break;
   }
 }
 private void InitializeComponent()
 {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.lbl = new System.Windows.Forms.Label();
   this.cmdAsyncState = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // textBox1
   // 
   this.textBox1.Location = new System.Drawing.Point(36, 36);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(205, 21);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "<Text will never appear here>";
   // 
   // lbl
   // 
   this.lbl.AutoSize = true;
   this.lbl.Location = new System.Drawing.Point(35, 77);
   this.lbl.Name = "lbl";
   this.lbl.Size = new System.Drawing.Size(0, 0);
   this.lbl.TabIndex = 1;
   // 
   // cmdAsyncState
   // 
   this.cmdAsyncState.Location = new System.Drawing.Point(36, 202);
   this.cmdAsyncState.Name = "cmdAsyncState";
   this.cmdAsyncState.Size = new System.Drawing.Size(141, 24);
   this.cmdAsyncState.TabIndex = 2;
   this.cmdAsyncState.Text = "GetAsyncState() for \"A\"";
   this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click);
   // 
   // Form1
   // 
   this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
   this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
   this.ClientSize = new System.Drawing.Size(292, 266);
   this.Controls.Add(this.cmdAsyncState);
   this.Controls.Add(this.lbl);
   this.Controls.Add(this.textBox1);
   this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
   this.KeyPreview = true;
   this.Name = "Form1";
   this.Text = "KeyTest";
   this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
   this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
   this.ResumeLayout(false);
   this.PerformLayout();
 }
 [STAThread]
 static void Main()
 {
   Application.EnableVisualStyles();
   Application.Run(new Form1());
 }

}


      </source>


Check KeyCode from KeyEventArgs

<source lang="csharp">

using System; using System.Drawing; using System.Windows.Forms;

class ExitOnX: Form {

    public static void Main()
    {
         Application.Run(new ExitOnX());
    }
    public ExitOnX()
    {
         Text = "Exit on X";
    }
    protected override void OnKeyDown(KeyEventArgs kea)
    {
         if (kea.KeyCode == Keys.X)
              Close();
    }

}

      </source>


Close Form with Pressing X key

<source lang="csharp">

using System; using System.Drawing; using System.Windows.Forms;

class ExitOnX: Form {

    public static void Main()
    {
         Application.Run(new ExitOnX());
    }
    public ExitOnX()
    {
         Text = "Exit on X";
    }
    protected override void OnKeyDown(KeyEventArgs kea)
    {
         if (kea.KeyCode == Keys.X)
              Close();
    }

}

      </source>


Control Key pressed

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {

  [DllImport("User32.dll")]
  private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); 
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label lbl;
 private System.Windows.Forms.Button cmdAsyncState;
 public Form1() {
       InitializeComponent();
 }
 private void Form1_KeyPress(object sender, KeyPressEventArgs e)
 {
   e.Handled = true;
 }
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
   lbl.Text = "Key Down: " + e.KeyValue.ToString();
   lbl.Text += "\nKey Code: " + e.KeyCode.ToString();
   lbl.Text += "\nKey Data: " + e.KeyData.ToString();
   if ((e.Modifiers & Keys.Shift) == Keys.Shift)
   {
     lbl.Text += "\n" + "Shift was held down.";
   }
   if ((e.Modifiers & Keys.Control) == Keys.Control)
   {
     lbl.Text += "\n" + "Control was held down.";
   }
   if (e.Alt)
   {
     lbl.Text += "\n" + "Alt was held down.";
   }
 }
 private void cmdAsyncState_Click(object sender, EventArgs e)
 {
   int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString());
   switch (state)
   {
     case 0:
       lbl.Text = "A has not been pressed since the last call.";
       break;
     case 1:
       lbl.Text = "A is not currently pressed, but has been pressed since the last call.";
         break;
     case -32767:
       lbl.Text = "A is currently pressed.";
       break;
   }
 }
 private void InitializeComponent()
 {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.lbl = new System.Windows.Forms.Label();
   this.cmdAsyncState = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // textBox1
   // 
   this.textBox1.Location = new System.Drawing.Point(36, 36);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(205, 21);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "<Text will never appear here>";
   // 
   // lbl
   // 
   this.lbl.AutoSize = true;
   this.lbl.Location = new System.Drawing.Point(35, 77);
   this.lbl.Name = "lbl";
   this.lbl.Size = new System.Drawing.Size(0, 0);
   this.lbl.TabIndex = 1;
   // 
   // cmdAsyncState
   // 
   this.cmdAsyncState.Location = new System.Drawing.Point(36, 202);
   this.cmdAsyncState.Name = "cmdAsyncState";
   this.cmdAsyncState.Size = new System.Drawing.Size(141, 24);
   this.cmdAsyncState.TabIndex = 2;
   this.cmdAsyncState.Text = "GetAsyncState() for \"A\"";
   this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click);
   // 
   // Form1
   // 
   this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
   this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
   this.ClientSize = new System.Drawing.Size(292, 266);
   this.Controls.Add(this.cmdAsyncState);
   this.Controls.Add(this.lbl);
   this.Controls.Add(this.textBox1);
   this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
   this.KeyPreview = true;
   this.Name = "Form1";
   this.Text = "KeyTest";
   this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
   this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
   this.ResumeLayout(false);
   this.PerformLayout();
 }
 [STAThread]
 static void Main()
 {
   Application.EnableVisualStyles();
   Application.Run(new Form1());
 }

}


      </source>


Displaying information about the key the user pressed

<source lang="csharp">

  using System;
  using System.Drawing;
  using System.Collections;
  using System.ruponentModel;
  using System.Windows.Forms;
  using System.Data;
  public class KeyDemo : System.Windows.Forms.Form
  {
     private System.Windows.Forms.Label charLabel;
     private System.Windows.Forms.Label keyInfoLabel;
     public KeyDemo()
     {
        InitializeComponent();
     }
     private void InitializeComponent()
     {
        this.charLabel = new System.Windows.Forms.Label();
        this.keyInfoLabel = new System.Windows.Forms.Label();
        this.SuspendLayout();
        this.charLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
        this.charLabel.Location = new System.Drawing.Point(8, 8);
        this.charLabel.Name = "charLabel";
        this.charLabel.Size = new System.Drawing.Size(168, 32);
        this.charLabel.TabIndex = 0;
        this.keyInfoLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F);
        this.keyInfoLabel.Location = new System.Drawing.Point(8, 56);
        this.keyInfoLabel.Name = "keyInfoLabel";
        this.keyInfoLabel.Size = new System.Drawing.Size(168, 136);
        this.keyInfoLabel.TabIndex = 0;
        this.AutoScaleBaseSize = new System.Drawing.Size(15, 37);
        this.ClientSize = new System.Drawing.Size(184, 197);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.keyInfoLabel,this.charLabel});
        this.Font = new System.Drawing.Font("Microsoft Sans Serif", 24F);
        this.Name = "Key Demo";
        this.Text = "Key Demo";
        this.KeyDown +=new System.Windows.Forms.KeyEventHandler(this.KeyDemo_KeyDown );
        this.KeyPress +=new System.Windows.Forms.KeyPressEventHandler(this.KeyDemo_KeyPress );
        this.KeyUp +=new System.Windows.Forms.KeyEventHandler(this.KeyDemo_KeyUp );
        
        this.ResumeLayout(false);
     }
     [STAThread]
     static void Main() 
     {
        Application.Run( new KeyDemo() );
     }
     protected void KeyDemo_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e )
     {  
        charLabel.Text = "Key pressed: " + e.KeyChar;
     }
     private void KeyDemo_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e )
     {
        keyInfoLabel.Text = 
           "Alt: " + (e.Alt ? "Yes" : "No") + "\n" +
           "Shift: " + (e.Shift ? "Yes" : "No" ) + "\n" +
           "Ctrl: " + (e.Control ? "Yes" : "No" ) + "\n" + 
           "KeyCode: " + e.KeyCode + "\n" +
           "KeyData: " + e.KeyData + "\n" +
           "KeyValue: " + e.KeyValue;                               
     }
  
     private void KeyDemo_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e )
     {
       Console.WriteLine("Key up");
     }
  }
          
      </source>


Displays a key pressed by the user

<source lang="csharp"> using System.Drawing; using System; using System.Windows.Forms; public class TryKey : Form {

 private char theKey = "d"; 
 public TryKey() {
   Size = new Size(300,200);
   BackColor = Color.White;
 }
 protected override void OnPaint(PaintEventArgs e) {
   Graphics g = e.Graphics;                                                                  
   g.DrawString(theKey.ToString(), new Font("Arial", 36, FontStyle.Bold), Brushes.Red, 100, 50);
   base.OnPaint(e); 
 }
 protected override void OnKeyDown(KeyEventArgs e){
   if (e.Control){
      Console.WriteLine("Control");
   }
   if (e.KeyCode == Keys.Right){
      Console.WriteLine("Right");
   }
   else if (e.KeyCode == Keys.Left){
      Console.WriteLine("Left");
   }
   Invalidate(); 
   base.OnKeyDown(e);  
 }
 protected override void OnKeyUp(KeyEventArgs e) { 
   Console.WriteLine("Key Up");
   base.OnKeyUp(e);
 }
 protected override void OnKeyPress(KeyPressEventArgs e) {
   if (char.IsLetterOrDigit(e.KeyChar)){
     theKey = e.KeyChar;
   }  
   Invalidate(); 
   base.OnKeyPress(e);
 }
 public static void Main() {
   Application.Run(new TryKey());
 }

}

      </source>


Get Async Key State

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {

  [DllImport("User32.dll")]
  private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); 
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label lbl;
 private System.Windows.Forms.Button cmdAsyncState;
 public Form1() {
       InitializeComponent();
 }
 private void Form1_KeyPress(object sender, KeyPressEventArgs e)
 {
   e.Handled = true;
 }
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
   lbl.Text = "Key Down: " + e.KeyValue.ToString();
   lbl.Text += "\nKey Code: " + e.KeyCode.ToString();
   lbl.Text += "\nKey Data: " + e.KeyData.ToString();
   if ((e.Modifiers & Keys.Shift) == Keys.Shift)
   {
     lbl.Text += "\n" + "Shift was held down.";
   }
   if ((e.Modifiers & Keys.Control) == Keys.Control)
   {
     lbl.Text += "\n" + "Control was held down.";
   }
   if (e.Alt)
   {
     lbl.Text += "\n" + "Alt was held down.";
   }
 }
 private void cmdAsyncState_Click(object sender, EventArgs e)
 {
   int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString());
   switch (state)
   {
     case 0:
       lbl.Text = "A has not been pressed since the last call.";
       break;
     case 1:
       lbl.Text = "A is not currently pressed, but has been pressed since the last call.";
         break;
     case -32767:
       lbl.Text = "A is currently pressed.";
       break;
   }
 }
 private void InitializeComponent()
 {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.lbl = new System.Windows.Forms.Label();
   this.cmdAsyncState = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // textBox1
   // 
   this.textBox1.Location = new System.Drawing.Point(36, 36);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(205, 21);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "<Text will never appear here>";
   // 
   // lbl
   // 
   this.lbl.AutoSize = true;
   this.lbl.Location = new System.Drawing.Point(35, 77);
   this.lbl.Name = "lbl";
   this.lbl.Size = new System.Drawing.Size(0, 0);
   this.lbl.TabIndex = 1;
   // 
   // cmdAsyncState
   // 
   this.cmdAsyncState.Location = new System.Drawing.Point(36, 202);
   this.cmdAsyncState.Name = "cmdAsyncState";
   this.cmdAsyncState.Size = new System.Drawing.Size(141, 24);
   this.cmdAsyncState.TabIndex = 2;
   this.cmdAsyncState.Text = "GetAsyncState() for \"A\"";
   this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click);
   // 
   // Form1
   // 
   this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
   this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
   this.ClientSize = new System.Drawing.Size(292, 266);
   this.Controls.Add(this.cmdAsyncState);
   this.Controls.Add(this.lbl);
   this.Controls.Add(this.textBox1);
   this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
   this.KeyPreview = true;
   this.Name = "Form1";
   this.Text = "KeyTest";
   this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
   this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
   this.ResumeLayout(false);
   this.PerformLayout();
 }
 [STAThread]
 static void Main()
 {
   Application.EnableVisualStyles();
   Application.Run(new Form1());
 }

}


      </source>


Get Key action information

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; public class Form1 : Form {

   private System.Windows.Forms.GroupBox GroupBox1;
   private System.Windows.Forms.Label Label4;
   private System.Windows.Forms.Label Label1;
   private System.Windows.Forms.PictureBox pic;
   private System.Windows.Forms.TextBox txt;
   private System.Windows.Forms.Button cmd;
   private System.Windows.Forms.Label Label2;
   private System.Windows.Forms.Label Label3;
   private System.Windows.Forms.ListBox eventLogList;
   public Form1() {
       InitializeComponent();
   }
   private void Log(String data)
   {
       eventLogList.Items.Add(data);
       int itemsPerPage = (int)(eventLogList.Height / eventLogList.ItemHeight);
       eventLogList.TopIndex = eventLogList.Items.Count - itemsPerPage;
   }
   private void txt_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
   {
       Log("Key Down: " + e.KeyCode.ToString() + e.KeyValue.ToString());
   }
   private void txt_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
   {
       Log("Key Press: " + e.KeyChar.ToString());
   }
   private void txt_KeyUp(object sender, System.Windows.Forms.KeyEventArgs e)
   {
       Log("Key Up: " + e.KeyCode.ToString() + e.KeyValue.ToString() + " Text is: " + txt.Text);
   }
   private void txt_TextChanged(object sender, System.EventArgs e)
   {
       Log("Changed: " + " Text is: " + txt.Text);
   }
   private void pic_MouseEnter(object sender, System.EventArgs e)
   {
       Log("Mouse Enter");
   }
   private void pic_MouseHover(object sender, System.EventArgs e)
   {
       Log("Mouse Hover");
   }
   private void pic_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
   {
       Log("Mouse Down: X=" + e.X.ToString() + " Y=" + e.Y.ToString() + " Button=" + e.Button.ToString());
   }
   private void pic_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
   {
       Log("Mouse Up: X=" + e.X.ToString() + " Y=" + e.Y.ToString() + " Button=" + e.Button.ToString());
   }
   private void pic_Click(object sender, System.EventArgs e)
   {
       Log("Click");
   }
   private void pic_DoubleClick(object sender, System.EventArgs e)
   {
       Log("Double Click");
   }
   private void pic_MouseLeave(object sender, System.EventArgs e)
   {
       Log("Mouse Leave");
   }
   private void InitializeComponent()
   {
       this.GroupBox1 = new System.Windows.Forms.GroupBox();
       this.Label4 = new System.Windows.Forms.Label();
       this.Label1 = new System.Windows.Forms.Label();
       this.pic = new System.Windows.Forms.PictureBox();
       this.txt = new System.Windows.Forms.TextBox();
       this.cmd = new System.Windows.Forms.Button();
       this.Label2 = new System.Windows.Forms.Label();
       this.Label3 = new System.Windows.Forms.Label();
       this.eventLogList = new System.Windows.Forms.ListBox();
       this.GroupBox1.SuspendLayout();
       ((System.ruponentModel.ISupportInitialize)(this.pic)).BeginInit();
       this.SuspendLayout();
       // 
       // GroupBox1
       // 
       this.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
                   | System.Windows.Forms.AnchorStyles.Right)));
       this.GroupBox1.Controls.Add(this.Label4);
       this.GroupBox1.Controls.Add(this.Label1);
       this.GroupBox1.Controls.Add(this.pic);
       this.GroupBox1.Controls.Add(this.txt);
       this.GroupBox1.Controls.Add(this.cmd);
       this.GroupBox1.Controls.Add(this.Label2);
       this.GroupBox1.FlatStyle = System.Windows.Forms.FlatStyle.System;
       this.GroupBox1.Location = new System.Drawing.Point(7, 0);
       this.GroupBox1.Name = "GroupBox1";
       this.GroupBox1.Size = new System.Drawing.Size(384, 148);
       this.GroupBox1.TabIndex = 12;
       this.GroupBox1.TabStop = false;
       // 
       // Label4
       // 
       this.Label4.Location = new System.Drawing.Point(92, 108);
       this.Label4.Name = "Label4";
       this.Label4.Size = new System.Drawing.Size(56, 16);
       this.Label4.TabIndex = 5;
       this.Label4.Text = "And here:";
       // 
       // Label1
       // 
       this.Label1.Location = new System.Drawing.Point(6, 24);
       this.Label1.Name = "Label1";
       this.Label1.Size = new System.Drawing.Size(144, 16);
       this.Label1.TabIndex = 2;
       this.Label1.Text = "Test keyboard events here:";
       // 
       // pic
       // 
       this.pic.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
       this.pic.Location = new System.Drawing.Point(156, 48);
       this.pic.Name = "pic";
       this.pic.Size = new System.Drawing.Size(192, 48);
       this.pic.TabIndex = 3;
       this.pic.TabStop = false;
       this.pic.DoubleClick += new System.EventHandler(this.pic_DoubleClick);
       this.pic.Click += new System.EventHandler(this.pic_Click);
       this.pic.MouseHover += new System.EventHandler(this.pic_MouseHover);
       this.pic.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pic_MouseUp);
       this.pic.MouseEnter += new System.EventHandler(this.pic_MouseEnter);
       this.pic.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pic_MouseDown);
       // 
       // txt
       // 
       this.txt.Location = new System.Drawing.Point(156, 20);
       this.txt.Name = "txt";
       this.txt.Size = new System.Drawing.Size(192, 21);
       this.txt.TabIndex = 1;
       this.txt.KeyUp += new System.Windows.Forms.KeyEventHandler(this.txt_KeyUp);
       this.txt.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txt_KeyPress);
       this.txt.TextChanged += new System.EventHandler(this.txt_TextChanged);
       this.txt.KeyDown += new System.Windows.Forms.KeyEventHandler(this.txt_KeyDown);
       // 
       // cmd
       // 
       this.cmd.FlatStyle = System.Windows.Forms.FlatStyle.System;
       this.cmd.Location = new System.Drawing.Point(156, 100);
       this.cmd.Name = "cmd";
       this.cmd.Size = new System.Drawing.Size(88, 28);
       this.cmd.TabIndex = 4;
       this.cmd.Text = "Button1";
       this.cmd.MouseLeave += new System.EventHandler(this.pic_MouseLeave);
       this.cmd.Click += new System.EventHandler(this.pic_Click);
       this.cmd.MouseEnter += new System.EventHandler(this.pic_MouseEnter);
       this.cmd.MouseHover += new System.EventHandler(this.pic_MouseHover);
       this.cmd.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pic_MouseUp);
       this.cmd.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pic_MouseDown);
       // 
       // Label2
       // 
       this.Label2.Location = new System.Drawing.Point(20, 52);
       this.Label2.Name = "Label2";
       this.Label2.Size = new System.Drawing.Size(128, 16);
       this.Label2.TabIndex = 2;
       this.Label2.Text = "Test mouse events here:";
       // 
       // Label3
       // 
       this.Label3.Location = new System.Drawing.Point(23, 100);
       this.Label3.Name = "Label3";
       this.Label3.Size = new System.Drawing.Size(64, 24);
       this.Label3.TabIndex = 11;
       this.Label3.Text = "Label3";
       // 
       // eventLogList
       // 
       this.eventLogList.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                   | System.Windows.Forms.AnchorStyles.Left)
                   | System.Windows.Forms.AnchorStyles.Right)));
       this.eventLogList.FormattingEnabled = true;
       this.eventLogList.IntegralHeight = false;
       this.eventLogList.Location = new System.Drawing.Point(7, 156);
       this.eventLogList.Name = "eventLogList";
       this.eventLogList.Size = new System.Drawing.Size(384, 212);
       this.eventLogList.TabIndex = 10;
       // 
       // Form1
       // 
       this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
       this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
       this.ClientSize = new System.Drawing.Size(399, 374);
       this.Controls.Add(this.GroupBox1);
       this.Controls.Add(this.Label3);
       this.Controls.Add(this.eventLogList);
       this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
       this.Name = "Form1";
       this.Text = "Event Tracker";
       this.GroupBox1.ResumeLayout(false);
       this.GroupBox1.PerformLayout();
       ((System.ruponentModel.ISupportInitialize)(this.pic)).EndInit();
       this.ResumeLayout(false);
   }
   [STAThread]
   static void Main()
   {
       Application.EnableVisualStyles();
       Application.Run(new Form1());
   }

}


      </source>


Keyboard Sample

<source lang="csharp"> /* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,

  Zach Greenvoss, Shripad Kulkarni, Neil Whitlow

Publisher: Peer Information ISBN: 1861007663

  • /

using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Text; namespace KeyboardSample {

   /// <summary>
   /// Summary description for KeyboardSample.
   /// </summary>
   public class KeyboardSample : System.Windows.Forms.Form
   {
     private System.Windows.Forms.TextBox textBox1;
     private System.Windows.Forms.TextBox textBox2;
     private System.Windows.Forms.GroupBox groupBox1;
     private System.Windows.Forms.Label label1;
     private System.Windows.Forms.GroupBox groupBox2;
     private System.Windows.Forms.Label label2;
       /// <summary>
       /// Required designer variable.
       /// </summary>
       private System.ruponentModel.Container components = null;
       public KeyboardSample()
       {
           //
           // Required for Windows Form Designer support
           //
           InitializeComponent();
           //
           // TODO: Add any constructor code after InitializeComponent call
           //
       }
       /// <summary>
       /// Clean up any resources being used.
       /// </summary>
       protected override void Dispose( bool disposing )
       {
           if( disposing )
           {
               if (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.textBox1 = new System.Windows.Forms.TextBox();
        this.textBox2 = new System.Windows.Forms.TextBox();
        this.groupBox1 = new System.Windows.Forms.GroupBox();
        this.label1 = new System.Windows.Forms.Label();
        this.groupBox2 = new System.Windows.Forms.GroupBox();
        this.label2 = new System.Windows.Forms.Label();
        this.groupBox1.SuspendLayout();
        this.groupBox2.SuspendLayout();
        this.SuspendLayout();
        // 
        // textBox1
        // 
        this.textBox1.Location = new System.Drawing.Point(16, 24);
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new System.Drawing.Size(168, 20);
        this.textBox1.TabIndex = 5;
        this.textBox1.Text = "";
        this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);
        // 
        // textBox2
        // 
        this.textBox2.Location = new System.Drawing.Point(16, 24);
        this.textBox2.Name = "textBox2";
        this.textBox2.Size = new System.Drawing.Size(168, 20);
        this.textBox2.TabIndex = 6;
        this.textBox2.Text = "";
        this.textBox2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox2_KeyDown);
        // 
        // groupBox1
        // 
        this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                               this.label1,
                                                                               this.textBox1});
        this.groupBox1.Location = new System.Drawing.Point(8, 8);
        this.groupBox1.Name = "groupBox1";
        this.groupBox1.TabIndex = 7;
        this.groupBox1.TabStop = false;
        this.groupBox1.Text = "Key Monitor";
        // 
        // label1
        // 
        this.label1.Location = new System.Drawing.Point(16, 64);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(168, 20);
        this.label1.TabIndex = 6;
        // 
        // groupBox2
        // 
        this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                               this.textBox2,
                                                                               this.label2});
        this.groupBox2.Location = new System.Drawing.Point(8, 120);
        this.groupBox2.Name = "groupBox2";
        this.groupBox2.TabIndex = 8;
        this.groupBox2.TabStop = false;
        this.groupBox2.Text = "Keys Enumeration";
        // 
        // label2
        // 
        this.label2.Location = new System.Drawing.Point(16, 64);
        this.label2.Name = "label2";
        this.label2.Size = new System.Drawing.Size(168, 20);
        this.label2.TabIndex = 9;
        // 
        // KeyboardSample
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(216, 229);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                     this.groupBox2,
                                                                     this.groupBox1});
        this.Name = "KeyboardSample";
        this.Text = "KeyboardSample";
        this.groupBox1.ResumeLayout(false);
        this.groupBox2.ResumeLayout(false);
        this.ResumeLayout(false);
     }
       #endregion
       /// <summary>
       /// The main entry point for the application.
       /// </summary>
       [STAThread]
       static void Main() 
       {
           Application.Run(new KeyboardSample());
       }
     private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
     {
        label1.Text = Convert.ToString(e.KeyValue);
     }
     private void textBox2_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
     {
        StringBuilder sb = new StringBuilder();
        if(e.Shift) sb.Append("Shift, ");
        if(e.Alt) sb.Append("Alt, ");
        if(e.Control) sb.Append("Ctrl, ");
                   
        if(e.KeyCode==Keys.W||e.KeyCode==Keys.R||e.KeyCode==Keys.O||e.KeyCode==Keys.X)
        {
           sb.Append("Wrox Press!!");
        }
        else if(e.KeyCode==Keys.Escape&&e.Modifiers==(Keys.Shift|Keys.Alt))
        {
           sb.Append("Escape - that won"t work!");
        }
        else if(e.KeyCode == Keys.C && e.Modifiers==(Keys.Alt | Keys.Control))
        {
           sb.Append("CopyRight");
           textBox2.SelectedText = "CopyRight";
           textBox2.SelectionLength = 0;
        }
        else 
        {
           sb.Append(Convert.ToString(e.KeyData));
        }
        label2.Text = sb.ToString();
     }
   }

}


      </source>


Key Press

<source lang="csharp"> /* GDI+ Programming in C# and VB .NET by Nick Symmonds Publisher: Apress ISBN: 159059035X

  • /

using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; namespace KeyPress {

   /// <summary>
   /// Summary description for KeyPress.
   /// </summary>
   public class KeyPress : System.Windows.Forms.Form
   {
   private System.Windows.Forms.Button button1;
   private System.Windows.Forms.Button button2;
       /// <summary>
       /// Required designer variable.
       /// </summary>
       private System.ruponentModel.Container components = null;
       public KeyPress()
       {
           //
           // Required for Windows Form Designer support
           //
           InitializeComponent();
           //
           // TODO: Add any constructor code after InitializeComponent call
           //
       }
       /// <summary>
       /// Clean up any resources being used.
       /// </summary>
       protected override void Dispose( bool disposing )
       {
           if( disposing )
           {
               if (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.button1 = new System.Windows.Forms.Button();
     this.button2 = new System.Windows.Forms.Button();
     this.SuspendLayout();
     // 
     // button1
     // 
     this.button1.Location = new System.Drawing.Point(184, 104);
     this.button1.Name = "button1";
     this.button1.Size = new System.Drawing.Size(80, 48);
     this.button1.TabIndex = 0;
     this.button1.Text = "button1";
     // 
     // button2
     // 
     this.button2.Location = new System.Drawing.Point(176, 192);
     this.button2.Name = "button2";
     this.button2.Size = new System.Drawing.Size(80, 32);
     this.button2.TabIndex = 1;
     this.button2.Text = "button2";
     // 
     // KeyPress
     // 
     this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
     this.ClientSize = new System.Drawing.Size(292, 273);
     this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                 this.button2,
                                                                 this.button1});
     this.Name = "KeyPress";
     this.Text = "KeyPress";
     this.Load += new System.EventHandler(this.KeyPress_Load);
     this.ResumeLayout(false);
   }
       #endregion
       /// <summary>
       /// The main entry point for the application.
       /// </summary>
       [STAThread]
       static void Main() 
       {
           Application.Run(new KeyPress());
       }
   private void KeyPress_Load(object sender, System.EventArgs e)
   {
     this.KeyPreview=true;
   }
   protected override void OnKeyPress(KeyPressEventArgs e)
   {
     MessageBox.Show("Key Pressed = " + e.KeyChar.ToString());
   }
   }

}

      </source>


Key Timer

<source lang="csharp"> /* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,

  Zach Greenvoss, Shripad Kulkarni, Neil Whitlow

Publisher: Peer Information ISBN: 1861007663

  • /

using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Runtime.InteropServices; namespace Wrox.ProgrammingWindowsGUI.Chapter5 {

   /// <summary>
   /// Summary description for Form1.
   /// </summary>
   public class KeyTimer : System.Windows.Forms.Form
   {
       /// <summary>
       /// Required designer variable.
       /// </summary>
       private System.ruponentModel.Container components = null;
       private uint start = 0;
       private uint stop = 0;
       [DllImport("kernel32.dll")]
       public static extern uint GetTickCount();
       public KeyTimer()
       {
           //
           // Required for Windows Form Designer support
           //
           //InitializeComponent();
           //
           // TODO: Add any constructor code after InitializeComponent call
           //
       }
       /// <summary>
       /// Clean up any resources being used.
       /// </summary>
       protected override void Dispose( bool disposing )
       {
           if( disposing )
           {
               if (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()
       {
           // 
           // Form1
           // 
           this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
           this.ClientSize = new System.Drawing.Size(292, 142);
           this.Name = "Form1";
           this.Text = "Form1";
       }
       #endregion
       /// <summary>
       /// The main entry point for the application.
       /// </summary>
       [STAThread]
       static void Main() 
       {
           Application.Run(new KeyTimer());
           
       }
       protected override void OnKeyDown(KeyEventArgs args)
       {
           start = GetTickCount();
       }
       protected override void OnKeyUp(KeyEventArgs args)
       {
           stop = GetTickCount();
           uint elapsed = (stop - start);
           MessageBox.Show(Convert.ToString(args.KeyData)+", time elapsed: "+Convert.ToString(elapsed)+" msecs");
       }
   }

}


      </source>


Shift key pressed

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {

  [DllImport("User32.dll")]
  private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); 
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label lbl;
 private System.Windows.Forms.Button cmdAsyncState;
 public Form1() {
       InitializeComponent();
 }
 private void Form1_KeyPress(object sender, KeyPressEventArgs e)
 {
   e.Handled = true;
 }
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
   lbl.Text = "Key Down: " + e.KeyValue.ToString();
   lbl.Text += "\nKey Code: " + e.KeyCode.ToString();
   lbl.Text += "\nKey Data: " + e.KeyData.ToString();
   if ((e.Modifiers & Keys.Shift) == Keys.Shift)
   {
     lbl.Text += "\n" + "Shift was held down.";
   }
   if ((e.Modifiers & Keys.Control) == Keys.Control)
   {
     lbl.Text += "\n" + "Control was held down.";
   }
   if (e.Alt)
   {
     lbl.Text += "\n" + "Alt was held down.";
   }
 }
 private void cmdAsyncState_Click(object sender, EventArgs e)
 {
   int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString());
   switch (state)
   {
     case 0:
       lbl.Text = "A has not been pressed since the last call.";
       break;
     case 1:
       lbl.Text = "A is not currently pressed, but has been pressed since the last call.";
         break;
     case -32767:
       lbl.Text = "A is currently pressed.";
       break;
   }
 }
 private void InitializeComponent()
 {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.lbl = new System.Windows.Forms.Label();
   this.cmdAsyncState = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // textBox1
   // 
   this.textBox1.Location = new System.Drawing.Point(36, 36);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(205, 21);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "<Text will never appear here>";
   // 
   // lbl
   // 
   this.lbl.AutoSize = true;
   this.lbl.Location = new System.Drawing.Point(35, 77);
   this.lbl.Name = "lbl";
   this.lbl.Size = new System.Drawing.Size(0, 0);
   this.lbl.TabIndex = 1;
   // 
   // cmdAsyncState
   // 
   this.cmdAsyncState.Location = new System.Drawing.Point(36, 202);
   this.cmdAsyncState.Name = "cmdAsyncState";
   this.cmdAsyncState.Size = new System.Drawing.Size(141, 24);
   this.cmdAsyncState.TabIndex = 2;
   this.cmdAsyncState.Text = "GetAsyncState() for \"A\"";
   this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click);
   // 
   // Form1
   // 
   this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
   this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
   this.ClientSize = new System.Drawing.Size(292, 266);
   this.Controls.Add(this.cmdAsyncState);
   this.Controls.Add(this.lbl);
   this.Controls.Add(this.textBox1);
   this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
   this.KeyPreview = true;
   this.Name = "Form1";
   this.Text = "KeyTest";
   this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
   this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
   this.ResumeLayout(false);
   this.PerformLayout();
 }
 [STAThread]
 static void Main()
 {
   Application.EnableVisualStyles();
   Application.Run(new Form1());
 }

}


      </source>