例5.18.frm

一本学习Visual Basic编程的好书

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3015
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3015
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   480
      TabIndex        =   7
      Top             =   1680
      Width           =   690
   End
   Begin VB.CommandButton Command4 
      Caption         =   "退出"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   3240
      TabIndex        =   5
      Top             =   2400
      Width           =   855
   End
   Begin VB.CommandButton Command3 
      Caption         =   "全清"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   3240
      TabIndex        =   4
      Top             =   1680
      Width           =   855
   End
   Begin VB.CommandButton Command2 
      Caption         =   "删除"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   3240
      TabIndex        =   3
      Top             =   960
      Width           =   855
   End
   Begin VB.ComboBox Combo1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   360
      Left            =   480
      TabIndex        =   0
      Text            =   "Combo1"
      Top             =   480
      Width           =   2175
   End
   Begin VB.CommandButton Command1 
      Caption         =   "添加"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   3240
      TabIndex        =   2
      Top             =   240
      Width           =   855
   End
   Begin VB.Label Label1 
      Caption         =   "选修课程总数"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   255
      Left            =   480
      TabIndex        =   6
      Top             =   1320
      Width           =   1455
   End
   Begin VB.Label Label2 
      Caption         =   "选修课程"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   480
      TabIndex        =   1
      Top             =   120
      Width           =   1095
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
   Combo1.AddItem "电子商务"
   Combo1.AddItem "网页制作"
   Combo1.AddItem "Internet简明教程"
   Combo1.AddItem "计算机网络基础"
   Combo1.AddItem "多媒体技术"
   Combo1.Text = ""                '置空值
   Text1.Text = Combo1.ListCount   '表项个数
End Sub
Private Sub command1_click()       '“添加”
   If Len(Combo1.Text) > 0 Then
       Combo1.AddItem Combo1.Text
       Text1.Text = Combo1.ListCount
   End If
   Combo1.Text = ""
   Combo1.SetFocus                  '设置焦点
End Sub
Private Sub command2_click()       '“删除”
   Dim ind As Integer
   ind = Combo1.ListIndex
   If ind <> -1 Then               '-1表示无表项
       Combo1.RemoveItem ind  '删除已选定的表项
       Text1.Text = Combo1.ListCount
   End If
End Sub
Private Sub command3_click()       '“全清”
   Combo1.Clear
   Text1.Text = Combo1.ListCount
End Sub
Private Sub command4_click()       '“退出”
   End
End Sub