form01.frm

VB＋M0开发GIS代码

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    =   5700
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7710
   LinkTopic       =   "Form1"
   ScaleHeight     =   5700
   ScaleWidth      =   7710
   StartUpPosition =   2  '屏幕中心
   Begin MapObjects2.Map Map1 
      Height          =   5415
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   7455
      _Version        =   131072
      _ExtentX        =   13150
      _ExtentY        =   9551
      _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
'Xue Wei,2003/5/17
'SearchExpression的简单练习；

Option Explicit
Dim g_symSelection As MapObjects2.Symbol
Dim recSelection As MapObjects2.Recordset

Private Sub Form_Load()
  Dim strExpression As String
  DrawLayer
  
  '查找
  'strExpression = "STATE_ID > 24 AND STATE_ID < 27"
  strExpression = "STATE_ID = 24"
  Set recSelection = Map1.Layers(0).SearchExpression(strExpression)
  
  '设置显示模式
  Set g_symSelection = New MapObjects2.Symbol
  g_symSelection.SymbolType = Map1.Layers(0).Symbol.SymbolType
  g_symSelection.color = moDarkGreen
End Sub

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 = moYellow
  Map1.Layers.Add layer
  Map1.Refresh
End Sub

Private Sub Map1_AfterLayerDraw(ByVal index As Integer, ByVal canceled As Boolean, ByVal hDC As stdole.OLE_HANDLE)
  Map1.DrawShape recSelection, g_symSelection
End Sub