identify.frm

地理信息系统工程案例精选程序,本书所有案例均需要单独配置

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "mo20.ocx"
Object = "{6B7E6392-850A-101B-AFC0-4210102A8DA7}#1.3#0"; "COMCTL32.OCX"
Begin VB.Form Form1 
   Caption         =   "SearchByDistance方法事例"
   ClientHeight    =   3330
   ClientLeft      =   1095
   ClientTop       =   1515
   ClientWidth     =   8160
   LinkTopic       =   "Form1"
   PaletteMode     =   1  'UseZOrder
   ScaleHeight     =   3330
   ScaleWidth      =   8160
   Begin ComctlLib.ListView ListView1 
      Height          =   3135
      Left            =   5040
      TabIndex        =   0
      Top             =   120
      Width           =   3015
      _ExtentX        =   5318
      _ExtentY        =   5530
      View            =   3
      LabelWrap       =   -1  'True
      HideSelection   =   -1  'True
      _Version        =   327682
      ForeColor       =   -2147483640
      BackColor       =   -2147483643
      Appearance      =   1
      NumItems        =   0
   End
   Begin MapObjects2.Map Map1 
      Height          =   3135
      Left            =   120
      TabIndex        =   1
      Top             =   120
      Width           =   4815
      _Version        =   131072
      _ExtentX        =   8493
      _ExtentY        =   5530
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Identify.frx":0000
   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()
  '初始化ListView的列首
  Set Col = ListView1.ColumnHeaders.Add()
  Col.Text = "字段"
  Set Col = ListView1.ColumnHeaders.Add()
  Col.Text = "值"

  '调入MapObjects自带的World数据
  '默认路径为C:\Program Files\ESRI\MapObjects2\Samples\Data\World
  Dim dc As New DataConnection
  dc.Database = "C:\Program Files\ESRI\MapObjects2\Samples\Data\World"
  If Not dc.Connect Then End
  
  Dim layer As MapLayer
  '调入country.shp图层
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("country")
  layer.Symbol.Color = moYellow
  Map1.Layers.Add layer
End Sub

'Map Control中鼠标按键按下响应代码
Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
  
  '得到Country图层
  Set l = Map1.Layers("country")
  '将坐标转换到地图坐标系下的坐标
  Set p = Map1.ToMapPoint(x, y)
  
  '执行SearchByDistance方法,获取p点附近的地理对象数据
  Set recs = l.SearchByDistance(p, 1, "")
  
  '若找到地理对象,则返回其记录集
  If Not recs.EOF Then
    '清除ListView中已有的数据
    ListView1.ListItems.Clear
    '遍历Fields集合,获取所有字段的值
    For Each fld In recs.Fields
      Set newItem = ListView1.ListItems.Add
      newItem.Text = fld.Name
      newItem.SubItems(1) = fld.ValueAsString
    Next fld
  End If
End Sub