例[6-22].frm

蒋加伏主编VB程序设计第四版PPT及全部课本源码 北京邮电大学出版社 Visual Basic 程序设计教程（第四版） 主编 蒋加伏 张林峰 找了好久的（不带密码的）

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "例［6-22］ 加密程序"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3675
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   3675
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "加密"
      Height          =   495
      Left            =   2400
      TabIndex        =   6
      Top             =   2160
      Width           =   855
   End
   Begin VB.CheckBox Check1 
      Caption         =   "密文隐藏"
      Height          =   375
      Left            =   2520
      TabIndex        =   5
      Top             =   840
      Width           =   1095
   End
   Begin VB.Frame Frame1 
      Caption         =   "移动位数"
      Height          =   1455
      Left            =   120
      TabIndex        =   4
      Top             =   1560
      Width           =   1695
      Begin VB.OptionButton Option3 
         Caption         =   "3"
         Height          =   255
         Left            =   240
         TabIndex        =   9
         Top             =   960
         Width           =   855
      End
      Begin VB.OptionButton Option2 
         Caption         =   "2"
         Height          =   255
         Left            =   240
         TabIndex        =   8
         Top             =   600
         Width           =   855
      End
      Begin VB.OptionButton Option1 
         Caption         =   "1"
         Height          =   255
         Left            =   240
         TabIndex        =   7
         Top             =   240
         Width           =   855
      End
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   840
      TabIndex        =   3
      Top             =   840
      Width           =   1575
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   840
      TabIndex        =   2
      Top             =   240
      Width           =   1575
   End
   Begin VB.Label Label2 
      Caption         =   "密文"
      Height          =   495
      Left            =   120
      TabIndex        =   1
      Top             =   960
      Width           =   735
   End
   Begin VB.Label Label1 
      Caption         =   "明文"
      Height          =   375
      Left            =   120
      TabIndex        =   0
      Top             =   360
      Width           =   735
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
  Dim n As Integer, k As Integer, m As Integer, c As String, a As String
  If Option1.Value = True Then      '加密时字母的移动位数放入n
     n = 1
  ElseIf Option2.Value = True Then
     n = 2
  Else
     n = 3
  End If
  m = Len(Text1.Text)
  a = ""
  For k = 1 To m
      c = Mid(Text1.Text, k, 1)     '从字符串中逐个取出字母进行加密
      c = Chr(Asc(c) + n)
      If c > "z" Or c > "Z" And c < "a" Then
         c = Chr(Asc(c) - 26)
      End If
      a = a + c
  Next k
  Text2.Text = a
End Sub
Private Sub Check1_Click()
  If Check1.Value = 1 Then
     Text2.PasswordChar = "*"           '密文显示为*
  Else
     Text2.PasswordChar = ""
  End If
End Sub