2、讀取PlaceMarks
Google Earth COM API中提供了兩個讀取PlaceMarks的函數。一個是GetTemporaryPlaces()，用來讀 取臨時位置；另一個是GetMyPlaces()，用來讀取自定義位置，即GoogleEarth中顯示的“我的位置”。呵 呵
1: ...
2: /// <summary>
3: /// 顯示位置“PlaceMarks”。位置分為兩種，一種時TemporaryPlaces，另一種為 MyPlaces
4: /// </summary>
5: protected void ShowPlaces()
6: {
7: Thread.Sleep(500);
8: // 獲取MyPlaces
9: FeatureGE myPlace = GeApp.GetMyPlaces();
10: // 獲取臨時位置
11: FeatureGE temporaryPlace = GeApp.GetTemporaryPlaces();
12: //
13: List<FeatureGE> places = new List<FeatureGE>();
14: places.Add(myPlace);
15: places.Add(temporaryPlace);
16:
17: // 獲取工具面板
18: GEToolPad toolPad = GetToolPad();
19: // 顯示所有位置
20: toolPad.ShowPlaces(places);
21: }
22: ...
23: /// <summary>
24: /// 顯示所有PlaceMarks（位置）
25: /// </summary>
26: /// <param name="places"></param>
27: public void ShowPlaces(List<FeatureGE> places)
28: {
29: if (this.InvokeRequired)
30: {
31: Action method = delegate {
32: InternalShowPlaces(places);
33: };
34:
35: try
36: {
37: this.Invoke(method);
38: }
39: catch { }
40: }
41: else
42: {
43: InternalShowPlaces(places);
44: }
45: }
46: /// <summary>
47: /// 顯示所有PlaceMarks（位置）。被ShowPlaces函數調用
48: /// </summary>
49: /// <param name="places"></param>
50: protected void InternalShowPlaces(List<FeatureGE> places)
51: {
52: this.tvPlaces.Nodes.Clear();
53:
54: if (places == null || places.Count <= 0)
55: return;
56:
57: foreach (FeatureGE place in places)
58: {
59: TreeNode node = new TreeNode(place.Name);
60: node.Checked = place.Visibility > 0;
61: node.Tag = place;
62:
63: ShowChildrenPlaces(place, node);
64:
65: node.Expand();
66:
67: this.tvPlaces.Nodes.Add(node);
68: }
69: }
70: /// <summary>
71: /// 顯示指定PlaceMark的子PlaceMark
72: /// </summary>
73: /// <param name="place">父PlaceMark</param>
74: /// <param name="node">父節點</param>
75: protected void ShowChildrenPlaces(FeatureGE place, TreeNode node)
76: {
77: FeatureCollectionGE places = place.GetChildren();
78:
79: foreach (FeatureGE child in places)
80: {
81: TreeNode tn = new TreeNode(child.Name);
82: tn.Checked = child.Visibility > 0;
83: tn.Tag = child;
84:
85: ShowChildrenPlaces(child, tn);
86:
87: node.Nodes.Add(tn);
88: }
89: }
