form01.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 Form01 
   Caption         =   "墨西哥地图"
   ClientHeight    =   5220
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6765
   LinkTopic       =   "Form1"
   ScaleHeight     =   5220
   ScaleWidth      =   6765
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   495
      Left            =   2760
      TabIndex        =   1
      Top             =   4680
      Width           =   1335
   End
   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        =   "Form01.frx":0000
   End
End
Attribute VB_Name = "Form01"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xuewei,2003/5/27
'显示图层的坐标系对象；

Option Explicit

Private Sub Command1_Click()
  Dim coordSys As Object
  Dim myLayer As MapObjects2.MapLayer
  
  Set myLayer = Map1.Layers(0)
  Set coordSys = myLayer.CoordinateSystem
  If coordSys.IsProjected Then
    MsgBox "图层为投影坐标系！"
  ElseIf Not coordSys.IsProjected Then
    MsgBox "图层为地理坐标系！"
  End If
End Sub

Private Sub Form_Load()
  Command1.Caption = "显示信息"
  DrawLayer
End Sub

Private Sub DrawLayer()
  Dim DC As New DataConnection
  Dim layer As MapLayer
  DC.Database = App.Path + "\..\" + "Mexico"
  If Not DC.Connect Then
    MsgBox "在指定的文件夹下没找到图层数据文件！"
    End
  End If
  
  Set layer = New MapLayer
  Set layer.GeoDataset = DC.FindGeoDataset("states")
  layer.Symbol.Color = moLimeGreen
  Map1.Layers.Add layer
End Sub