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教程-Delphi调用百度地图API(XE8+WIN7)

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

 

 

相关资料:

无言 QQ:4252181

 

实例代码：

 

  1 unit U_map;
  2 
  3 interface
  4 //---------------------------------------------------//
  5 //----------COPY BY 无言 QQ:4252181 -----------------//
  6 //---------------------------------------------------//
  7 uses
  8   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  9   Dialogs, OleCtrls, SHDocVw, StdCtrls, MSHTML, StrUtils, ActiveX,
 10   ExtCtrls;
 11 //---------------------------------------------------//
 12 //----------欢迎大家和我联系，软件开发 --------------//
 13 //---------------------------------------------------//
 14 type
 15   TF_map = class(TForm)
 16     grp1: TGroupBox;
 17     WebBrowser: TWebBrowser;
 18     grp2: TGroupBox;
 19     grp3: TGroupBox;
 20     grp4: TGroupBox;
 21     tmr1: TTimer;
 22     GroupBox1: TGroupBox;
 23     GroupBox2: TGroupBox;
 24     Edit1: TEdit;
 25     Edit2: TEdit;
 26     chk1: TCheckBox;
 27     Edit3: TEdit;
 28     Edit4: TEdit;
 29     edt1: TEdit;
 30     edt2: TEdit;
 31     edt3: TEdit;
 32     edt4: TEdit;
 33     procedure FormCreate(Sender: TObject);
 34     procedure btn1Click(Sender: TObject);
 35     procedure btn2Click(Sender: TObject);
 36     procedure FormShow(Sender: TObject);
 37     procedure btn3Click(Sender: TObject);
 38     procedure Button1Click(Sender: TObject);
 39     procedure loadweb();
 40     procedure btn4Click(Sender: TObject);
 41     procedure AppMsg(var Msg: TagMsg; var Handled: Boolean);
 42     procedure GetWebContent();
 43     procedure tmr1Timer(Sender: TObject);
 44   private
 45     { Private declarations }
 46     lng, lat: string;
 47   public
 48     { Public declarations }
 49   end;
 50 
 51 var
 52   F_map: TF_map;
 53   const
 54   Doc1: string = '<html>'
 55   + '<head>'
 56   + '<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />'
 57   + '<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />'
 58   + '<title>BAIDU MAP</title>'
 59   + '<style type="text/css">'
 60   + 'html{height:100%}' + 'body{height:100%;margin:0px;padding:0px}'
 61   + '#container{height:100%}'
 62   + '</style>'
 63   + '<script type="text/javascript"src="http://api.map.baidu.com/api?v=1.3"></script>'
 64   + '</head>'
 65   + '<body>'
 66   + '<div >'
 67   //style="visibility:hidden; display:none">
 68   +'<div >'
 69   +'<div >'
 70   +'<div >'
 71   +'<div >'
 72   +'<div >'
 73   +'<div >'
 74   +'<div >'
 75   + '<script language="JavaScript" type="text/javascript">'
 76   + 'var map = new BMap.Map("container");'  // 创建地图实例
 77   + 'map.addControl(new BMap.NavigationControl());'
 78   + 'map.addControl(new BMap.ScaleControl());'
 79   + 'map.addControl(new BMap.OverviewMapControl());'
 80   + 'map.addControl(new BMap.MapTypeControl(BMAP_ANCHOR_BOTTOM_RIGHT));'   // 将标注添加到地图中
 81   + 'map.enableScrollWheelZoom();'                  // 启用滚轮放大缩小。
 82   + 'map.enableKeyboard();'                         // 启用键盘操作。
 83   + 'var centerpoint = new BMap.Point(126.666431,45.764502);' // 创建点坐标  126.666431, 45.764502
 84   + 'var marker = new BMap.Marker(centerpoint);'        // 创建标注
 85   + 'map.addOverlay(marker);'
 86   + 'var label = new BMap.Label("哈尔滨海铭科技有限公司",{offset:new BMap.Size(20,-10)});'
 87   + 'marker.setLabel(label);'
 88   +' map.centerAndZoom(centerpoint, 15);' // 初始化地图，设置中心点坐标和地图级别'
 89 
 90   +' map.addEventListener("mousemove", function(e){'
 91   +' document.getElementById("weidutemp").innerHTML = e.point.lng;'
 92   +' document.getElementById("jingdutemp").innerHTML =  e.point.lat;});'
 93   +' map.addEventListener("click", function(f){'
 94   +' document.getElementById("weidu").innerHTML = f.point.lng;'
 95   +' document.getElementById("jingdu").innerHTML =  f.point.lat;});'
 96 
 97   +'function SetCarCenterPoint(newlng,newlat){'
 98   +'centerpoint=new BMap.Point(newlng,newlat);'
 99   + 'var marker = new BMap.Marker(centerpoint);'
100   + 'map.addOverlay(marker);'
101   + 'var label = new BMap.Label("当前汽车坐标",{offset:new BMap.Size(20,-10)});'
102   + 'marker.setLabel(label);'
103   + 'map.panTo(centerpoint);'
104   +'}'
105 
106   +'function SetAutoCenterPoint(newlng,newlat){'
107   +'centerpoint=new BMap.Point(newlng,newlat);'
108   + 'var marker = new BMap.Marker(centerpoint);'
109   + 'map.addOverlay(marker);'
110   + 'var label = new BMap.Label("4S店坐标",{offset:new BMap.Size(20,-10)});'
111   + 'marker.setLabel(label);'
112   + 'map.panTo(centerpoint);'
113   +'}'
114 
115   +'function PrintLine(newlng,newlat,oldlng,oldlat,biaoji){'
116   +'var point = new BMap.Point(newlng,newlat);' // 创建点坐标
117   + 'map.panTo(point);'
118 //  + 'if (biaoji=''0'')'
119 //  +'{'
120 //  + 'var marker = new BMap.Marker(point);'
121 //  + 'map.addOverlay(marker);'
122 //  +'}'
123   + 'var polyline = new BMap.Polyline(['
124   + 'new BMap.Point(oldlng,oldlat),'
125   + 'new BMap.Point(point.lng, point.lat)'
126   + '], {strokeColor:"blue", strokeWeight:4, strokeOpacity:0.5});'
127   + 'map.addOverlay(polyline);'
128   +'}'
129 
130   +'function GetCenter(){'
131   +' var center = map.getCenter();'
132   +' document.getElementById("centerweidu").innerHTML = center.lng;'
133   +' document.getElementById("centerjingdu").innerHTML = center.lat;'
134   +'}'
135   +'function Distance(newlng,newlat){'
136   +'var pointA=centerpoint;'
137   +'var pointB=new BMap.Point(newlng,newlat);'
138   +'document.getElementById("Distance").innerHTML = map.getDistance(pointA,pointB);'
139   +'alert(''距离是：''+map.getDistance(pointA,pointB)+'' 米。'');'
140  // +'return map.getDistance(pointA,pointB);'
141   +'}'
142   + '</script>'
143   + '</body>'
144   + '</html>';
145 implementation
146 
147 {$R *.dfm}
148 
149 procedure TF_map.AppMsg(var Msg: TagMsg; var Handled: Boolean);
150 var
151   mPoint: TPoint;
152 begin
153   if IsChild(WebBrowser.Handle, Msg.Hwnd) and (Msg.Message = WM_MOUSEMOVE) then
154   begin
155     GetCursorPos(mPoint);
156     GetWebContent;
157     Handled := True;
158   end;
159 end;
160 
161 function JavaScript(j: string): Boolean;
162 begin
163   try
164     // (F_map.WebBrowser.Document as IHTMLDocument2).parentWindow.execScript(j, 'JavaScript');
165     F_map.WebBrowser.OleObject.Document.parentWindow.execScript(j,
166       'JavaScript');
167     Result := True;
168   except
169     Result := false;
170   end;
171 end;
172 
173 procedure TF_map.btn1Click(Sender: TObject);
174 var
175   str: string;
176 begin
177   self.WebBrowser.OleObject.Document.parentWindow.execScript('GetCenter()',
178     'JavaScript');
179 end;
180 
181 procedure TF_map.btn2Click(Sender: TObject);
182 var
183   str: string;
184 begin
185   if (Edit1.Text <> '') and (Edit2.Text <> '') then
186   begin
187     self.WebBrowser.OleObject.Document.parentWindow.execScript
188       ('Distance(' + Edit1.Text + ',' + Edit2.Text + ')', 'JavaScript');
189   end;
190 end;
191 
192 procedure TF_map.btn3Click(Sender: TObject);
193 var
194   biaoji: string;
195 begin
196   if lng = '' then
197   begin
198     lng := '126.666431'; // 126.666431,45.764502
199   end;
200   if lat = '' then
201   begin
202     lat := '45.764502';
203   end;
204   if chk1.Checked then
205   begin
206     biaoji := '1';
207   end
208   else
209   begin
210     biaoji := '0';
211   end;
212   if (Edit1.Text <> '') and (Edit2.Text <> '') then
213   begin
214     self.WebBrowser.OleObject.Document.parentWindow.execScript
215       ('PrintLine(' + Edit1.Text + ',' + Edit2.Text + ',' + lng + ',' + lat +
216         ',' + biaoji + ')', 'JavaScript');
217     lng := self.Edit1.Text;
218     lat := self.Edit2.Text;
219   end;
220 end;
221 
222 procedure TF_map.btn4Click(Sender: TObject);
223 begin
224   loadweb;
225   lng := '';
226   lat := '';
227 end;
228 
229 procedure TF_map.Button1Click(Sender: TObject);
230 var
231   str: string;
232 begin
233   if (Edit3.Text <> '') and (Edit4.Text <> '') then
234   begin
235     self.WebBrowser.OleObject.Document.parentWindow.execScript
236       ('SetAutoCenterPoint(' + Edit3.Text + ',' + Edit4.Text +
237         ')', 'JavaScript');
238   end;
239 end;
240 
241 procedure TF_map.loadweb();
242 var
243   sl: TStringList;
244   ms: TMemoryStream;
245 begin
246   self.WebBrowser.Silent := True;
247   WebBrowser.Navigate('about:blank'); (WebBrowser.Document as IHTMLDocument2)
248   .URL := 'http://127.0.0.1/';
249   while WebBrowser.ReadyState < READYSTATE_INTERACTIVE do
250     Application.ProcessMessages;
251   if Assigned(WebBrowser.Document) then
252   begin
253     sl := TStringList.Create;
254     try
255       ms := TMemoryStream.Create;
256       try
257         sl.Text := Doc1;
258         sl.SaveToStream(ms);
259         ms.Seek(0, 0); (WebBrowser.Document as IPersistStreamInit)
260         .Load(TStreamAdapter.Create(ms));
261       finally
262         ms.Free;
263       end;
264     finally
265       sl.Free;
266     end;
267   end;
268 end;
269 
270 procedure TF_map.tmr1Timer(Sender: TObject);
271 begin
272   GetWebContent;
273 end;
274 
275 procedure TF_map.FormCreate(Sender: TObject);
276 begin
277   loadweb;
278   //Application.OnMessage:=AppMsg;
279 end;
280 
281 procedure TF_map.FormShow(Sender: TObject);
282 begin
283   lng := '';
284   lat := '';
285   tmr1.Enabled := True;
286 end;
287 
288 procedure TF_map.GetWebContent();
289 var
290   html: IHTMLDocument2; // 定义网页元素
291   submitbutton: OleVariant; // 定义按钮
292   centerweidu, centerjingdu, weidu, jingdu, weidutemp,
293     jingdutemp: IHTMLElement; // 定义网页输入元素
294 begin
295   try
296     html := self.WebBrowser.Document as IHTMLDocument2;
297     centerweidu := html.all.item('centerweidu', 0) as IHTMLElement;
298     centerjingdu := html.all.item('centerjingdu', 0) as IHTMLElement;
299     weidu := html.all.item('weidu', 0) as IHTMLElement;
300     jingdu := html.all.item('jingdu', 0) as IHTMLElement;
301     weidutemp := html.all.item('weidutemp', 0) as IHTMLElement;
302     jingdutemp := html.all.item('jingdutemp', 0) as IHTMLElement;
303     edt1.Text := centerweidu.innerText;
304     edt2.Text := centerjingdu.innerText;
305     edt3.Text := weidutemp.innerText;
306     edt4.Text := jingdutemp.innerText;
307     Edit1.Text := weidu.innerText;
308     Edit2.Text := jingdu.innerText;
309   except
310   end;
311 end;
312 
313 end.
View Code

 

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