Displaying information about a user-pressed key : Key Event « Event « VB.Net Tutorial






Displaying information about a user-pressed key
Imports System.Windows.Forms

public class KeyCodeChar
   public Shared Sub Main
        Application.Run(New FrmKeyDemo)
   End Sub
End class


Public Class FrmKeyDemo
   Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      'This call is required by the Windows Form Designer.
      InitializeComponent()

      'Add any initialization after the InitializeComponent() call

   End Sub

   'Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub
   Friend WithEvents lblInformation As System.Windows.Forms.Label
   Friend WithEvents lblCharacter As System.Windows.Forms.Label

   'Required by the Windows Form Designer
   Private components As System.ComponentModel.Container

   'NOTE: The following procedure is required by the Windows Form Designer
   'It can be modified using the Windows Form Designer.  
   'Do not modify it using the code editor.
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.lblInformation = New System.Windows.Forms.Label()
      Me.lblCharacter = New System.Windows.Forms.Label()
      Me.SuspendLayout()
      '
      'lblInformation
      '
      Me.lblInformation.Font = New System.Drawing.Font("Microsoft Sans Serif", 12!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.lblInformation.Location = New System.Drawing.Point(8, 56)
      Me.lblInformation.Name = "lblInformation"
      Me.lblInformation.Size = New System.Drawing.Size(176, 136)
      Me.lblInformation.TabIndex = 1
      '
      'lblCharacter
      '
      Me.lblCharacter.Font = New System.Drawing.Font("Microsoft Sans Serif", 12!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.lblCharacter.Location = New System.Drawing.Point(8, 16)
      Me.lblCharacter.Name = "lblCharacter"
      Me.lblCharacter.Size = New System.Drawing.Size(168, 23)
      Me.lblCharacter.TabIndex = 0
      '
      'FrmKeyDemo
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(9, 22)
      Me.ClientSize = New System.Drawing.Size(192, 205)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblInformation, Me.lblCharacter})
      Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 14.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.Name = "FrmKeyDemo"
      Me.Text = "KeyDemo"
      Me.ResumeLayout(False)

   End Sub

#End Region

   Private Sub FrmKeyDemo_KeyPress(ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.KeyPressEventArgs) _
      Handles MyBase.KeyPress

      lblCharacter.Text = "Key pressed: " & e.KeyChar
   End Sub

   Private Sub FrmKeyDemo_KeyDown(ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.KeyEventArgs) _
      Handles MyBase.KeyDown

      lblInformation.Text = "KeyCode: " & e.KeyCode.ToString & _
            vbCrLf & "KeyData: " & e.KeyData.ToString & _
            vbCrLf & "KeyValue: " & e.KeyValue & vbCrLf

      If e.Alt Then
         lblInformation.Text &= "Alt: Yes" & vbCrLf
      Else
         lblInformation.Text &= "Alt: No" & vbCrLf
      End If

      If e.Shift Then
         lblInformation.Text &= "Shift: Yes" & vbCrLf
      Else
         lblInformation.Text &= "Shift: No" & vbCrLf
      End If

      If e.Control Then
         lblInformation.Text &= "Ctrl: Yes" & vbCrLf
      Else
         lblInformation.Text &= "Ctrl: No" & vbCrLf
      End If

   End Sub ' FrmKeyDemo_KeyDown

   ' clear labels when key is released
   Private Sub FrmKeyDemo_KeyUp(ByVal sender As System.Object, _
      ByVal e As System.Windows.Forms.KeyEventArgs) _
      Handles MyBase.KeyUp

      lblInformation.Text = "Key up"
      lblCharacter.Text = "Key up"
   End Sub 

End Class








11.6.Key Event
11.6.1.Check Key Code: F5Check Key Code: F5
11.6.2.Displaying information about a user-pressed keyDisplaying information about a user-pressed key
11.6.3.Determine whether user pressed Enter keyDetermine whether user pressed Enter key
11.6.4.Ignore key codeIgnore key code
11.6.5.Key event summaryKey event summary
11.6.6.Control KeyControl Key
11.6.7.Shift KeyShift Key
11.6.8.Check Key Code rangeCheck Key Code range