form05.frm

给出了详细的vb环境下mo基本功能的代码 如图层的加载

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "mo20.ocx"
Begin VB.Form Form05 
   Caption         =   "墨西哥地图"
   ClientHeight    =   4665
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6765
   LinkTopic       =   "Form1"
   ScaleHeight     =   4665
   ScaleWidth      =   6765
   StartUpPosition =   3  '窗口缺省
   Begin MapObjects2.Map Map1 
      Height          =   4575
      Left            =   0
      TabIndex        =   0
      Top             =   0
      Width           =   6735
      _Version        =   131072
      _ExtentX        =   11880
      _ExtentY        =   8070
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form05.frx":0000
   End
End
Attribute VB_Name = "Form05"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xuewei,2003/6/13
'删除特征示例；

Option Explicit

Private Sub DrawLayer()
  Dim Layer As MapLayer
  Dim dc As New DataConnection
   
  On Error GoTo Err1
  dc.Database = App.Path + "\..\" + "Mexico"
  Set Layer = New MapLayer
  Set Layer.GeoDataset = dc.FindGeoDataset("states")
  Layer.Symbol.Color = moLimeGreen
  Map1.Layers.Add Layer
  
  Set Layer = New MapLayer
  Set Layer.GeoDataset = dc.FindGeoDataset("CITIES1")
  Layer.Symbol.Color = moRed
  Map1.Layers.Add Layer
  
  'MsgBox "数据连接成功", vbInformation, "MO示例"
  Exit Sub
  
Err1:
  If dc.ConnectError = 0 Then
    MsgBox "没找到图层", vbInformation, "MO示例"
  Else
    MsgBox ConnectErrorMsg(dc.ConnectError), vbInformation, "MO示例"
  End If
  End
End Sub

Private Sub Form_Load()
  DrawLayer   '加载墨西哥地图的States和Cities图层；
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim P1 As MapObjects2.Point
  Const D1 = 0.3
  Dim Recset As MapObjects2.Recordset
  Dim Ans As Integer
  
  Set P1 = Map1.ToMapPoint(X, Y)
  '距离查找；
  Set Recset = Map1.Layers(0).SearchByDistance(P1, D1, "")
  If Not Recset.EOF Then
    Map1.FlashShape Recset.Fields("shape").Value, 3
    Ans = MsgBox("要删除这个特征?", vbYesNo, "MO示例")
    If Ans = vbYes Then
      If Recset.Updatable Then
        Recset.Edit
        Recset.Delete
        Recset.MoveNext
        Recset.StopEditing
        Map1.Refresh
      Else
        MsgBox "记录集不可修改。"
      End If
    End If
  Else
    MsgBox "没有点击特征。"
  End If
End Sub