frmkeys.frm

Visual Basic 6 大学教程的代码

VERSION 5.00
Begin VB.Form frmKeys 
   AutoRedraw      =   -1  'True
   Caption         =   "Fig. 12.13: Key Events"
   ClientHeight    =   3195
   ClientLeft      =   2535
   ClientTop       =   1590
   ClientWidth     =   4680
   BeginProperty Font 
      Name            =   "MS Sans Serif"
      Size            =   18
      Charset         =   0
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
End
Attribute VB_Name = "frmKeys"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
' Fig. 12.13
' Demonstrating KeyDown, KeyUp, and KeyPress
Option Explicit                ' General declaration
Dim mTitleString As String     ' General declaration

Private Sub Form_Load()
   ' Store Caption value for use in KeyPress
   mTitleString = Caption & Space$(5)
End Sub

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
   
   ' Determine which, if any, of the Shift, Ctrl,
   ' or Alt keys is pressed
   Select Case Shift
      Case vbShiftMask                          ' Shift
         ForeColor = vbYellow
      Case vbAltMask                            ' Alt
         ForeColor = vbRed
      Case vbCtrlMask                           ' Ctrl
         ForeColor = vbGreen
      Case vbShiftMask + vbAltMask              ' Shift + Alt
         ForeColor = vbBlue
      Case vbShiftMask + vbCtrlMask             ' Shift + Ctrl
         ForeColor = vbMagenta
      Case vbAltMask + vbCtrlMask               ' Alt + Ctrl
         ForeColor = vbCyan
      Case vbAltMask + vbCtrlMask + vbShiftMask ' All three
         Call Cls
    End Select
    
   ' Test for letter key
   If KeyCode >= vbKeyA And KeyCode <= vbKeyZ Then
      Print Chr$(KeyCode);    ' Print the character
   ElseIf KeyCode = vbKeyReturn Then   ' Return key
      Print                   ' Print on next line
   End If
         
End Sub

Private Sub Form_KeyPress(KeyAscii As Integer)
   ' Update title bar to display the key pressed
   Caption = mTitleString & "(" & Chr$(KeyAscii) & ")"
End Sub

Private Sub Form_KeyUp(KeyCode As Integer, Shift As Integer)
   ' When key is released, change ForeColor to black
   ForeColor = vbBlack
End Sub