frmcity.frm

vb 的例子

VERSION 5.00
Begin VB.Form frmCity 
   Caption         =   "城市与人口"
   ClientHeight    =   2835
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4980
   LinkTopic       =   "Form1"
   ScaleHeight     =   2835
   ScaleWidth      =   4980
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton cmdClear 
      Caption         =   "全部删除(&X)"
      Height          =   375
      Left            =   600
      TabIndex        =   8
      Top             =   2280
      Width           =   1335
   End
   Begin VB.CommandButton cmddelete 
      Caption         =   "删除(&D)<-"
      Height          =   375
      Left            =   600
      TabIndex        =   7
      Top             =   1800
      Width           =   1335
   End
   Begin VB.CommandButton cmdAdd 
      Caption         =   "添加(&A)->"
      Height          =   375
      Left            =   600
      TabIndex        =   6
      Top             =   1320
      Width           =   1335
   End
   Begin VB.Frame fraCity 
      Caption         =   "已有城市(&S)"
      Height          =   2415
      Left            =   2640
      TabIndex        =   4
      Top             =   240
      Width           =   1935
      Begin VB.ListBox lstCity 
         Height          =   1860
         Left            =   240
         TabIndex        =   5
         Top             =   240
         Width           =   1455
      End
   End
   Begin VB.TextBox txtPop 
      Height          =   375
      Left            =   1200
      TabIndex        =   1
      Top             =   840
      Width           =   1095
   End
   Begin VB.TextBox txtCity 
      Height          =   375
      Left            =   1200
      TabIndex        =   0
      Top             =   240
      Width           =   1095
   End
   Begin VB.Label lblPop 
      Caption         =   "人口数(&P)"
      Height          =   255
      Left            =   240
      TabIndex        =   3
      Top             =   960
      Width           =   855
   End
   Begin VB.Label lblCity 
      Caption         =   "城市名(&C)"
      Height          =   255
      Left            =   240
      TabIndex        =   2
      Top             =   360
      Width           =   855
   End
End
Attribute VB_Name = "frmCity"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub cmdAdd_Click()
    Dim strCity As String
    Dim lngPop As Long
    Dim int1 As Integer
    strCity = CStr(txtCity.Text)
    lngPop = CLng(txtPop.Text)
    If strCity = "" Then Exit Sub
    
    For int1 = 0 To lstCity.ListCount - 1
        If strCity = lstCity.List(int1) Then
            Exit Sub
        End If
    Next
    
    lstCity.AddItem strCity
    lstCity.ItemData(lstCity.NewIndex) = lngPop
    txtCity.Text = ""
    txtPop.Text = ""
End Sub

Private Sub cmdClear_Click()
    lstCity.Clear
End Sub

Private Sub cmddelete_Click()
    If lstCity.ListIndex > -1 Then
        lstCity.RemoveItem lstCity.ListIndex
    End If
End Sub

Private Sub lstCity_Click()
    txtCity.Text = lstCity.List(lstCity.ListIndex)
    txtPop.Text = lstCity.ItemData(lstCity.ListIndex)
End Sub