www.pudn.com > 12136.rar > Form08.frm

VERSION 5.00 
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "mo20.ocx" 
Begin VB.Form Form08  
   Caption         =   "Form" 
   ClientHeight    =   6195 
   ClientLeft      =   60 
   ClientTop       =   345 
   ClientWidth     =   6975 
   LinkTopic       =   "Form1" 
   ScaleHeight     =   6195 
   ScaleWidth      =   6975 
   StartUpPosition =   3  '窗口缺省 
   Begin VB.CommandButton Command1  
      Caption         =   "Command1" 
      Height          =   495 
      Left            =   2760 
      TabIndex        =   1 
      Top             =   5520 
      Width           =   1335 
   End 
   Begin MapObjects2.Map Map1  
      Height          =   4815 
      Left            =   0 
      TabIndex        =   0 
      Top             =   0 
      Width           =   6975 
      _Version        =   131072 
      _ExtentX        =   12303 
      _ExtentY        =   8493 
      _StockProps     =   225 
      BackColor       =   16777215 
      BorderStyle     =   1 
      Contents        =   "Form08.frx":0000 
   End 
   Begin VB.Label Label1  
      Caption         =   "Label1" 
      Height          =   375 
      Left            =   1080 
      TabIndex        =   2 
      Top             =   4920 
      Width           =   4815 
   End 
End 
Attribute VB_Name = "Form08" 
Attribute VB_GlobalNameSpace = False 
Attribute VB_Creatable = False 
Attribute VB_PredeclaredId = True 
Attribute VB_Exposed = False 
'Xuewei,2003/6/14 
'用Export方法产生prj文件； 
 
Option Explicit 
Dim dc As New DataConnection 
 
Private Sub Command1_Click() 
  Dim PCS As New MapObjects2.ProjCoordSys 
  Dim Layer1 As MapObjects2.MapLayer 
  Dim Str1 As String 
   
  Set Layer1 = Map1.Layers("states1") 
  PCS.Type = 54019 
  With Layer1 
    Str1 = dc.Database + "\states1.prj" 
    .CoordinateSystem = PCS 
    .CoordinateSystem.Export (Str1) 
    Label1.Caption = DisplayCoords(Layer1) 
  End With 
  MsgBox "坐标系文件已经产生" 
End Sub 
 
Private Function DisplayCoords(myLayer As MapObjects2.MapLayer) As String 
  Dim coordSys 
  Dim PCS As New MapObjects2.ProjCoordSys 
  Dim GCS As New MapObjects2.GeoCoordSys 
   
  Set coordSys = myLayer.CoordinateSystem 
  If coordSys.IsProjected Then 
    Set PCS = myLayer.CoordinateSystem 
    DisplayCoords = "图层为投影坐标系，Type＝" & PCS.Type & "，Unit＝" & PCS.Unit.name & _ 
    "，Projection＝" & PCS.Projection.name & "，GeoCoordSys＝" & PCS.GeoCoordSys.Type 
  ElseIf Not coordSys.IsProjected Then 
    Set GCS = myLayer.CoordinateSystem 
    DisplayCoords = "图层为地理坐标系，Type＝" & GCS.Type & "，Unit＝" & GCS.Unit.name & _ 
    "，Datum＝" & GCS.Datum.name & "，PrimeMeridian＝" & GCS.PrimeMeridian.name 
  End If 
End Function 
 
Private Sub Form_Load() 
  DrawLayer 
  Me.Caption = "坐标系文件产生" 
  Command1.Caption = "开始" 
End Sub 
 
Private Sub DrawLayer() 
  Dim Layer As MapLayer 
      
  On Error GoTo Err1 
  dc.Database = App.Path + "\..\" + "Mexico" 
  Set Layer = New MapLayer 
  Set Layer.GeoDataset = dc.FindGeoDataset("states") 
  Label1.Caption = DisplayCoords(Layer) 
  Map1.Layers.Add Layer 
   
  Set Layer = New MapLayer 
  Set Layer.GeoDataset = dc.FindGeoDataset("states1") 
  Map1.Layers.Add Layer 
  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