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  • 教程-Delphi调用百度地图API(XE8+WIN7)

    unit U_map;
    
    interface
    //---------------------------------------------------//
    //----------COPY BY 无言 QQ:4252181 -----------------//
    //---------------------------------------------------//
    uses
      Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
      Dialogs, OleCtrls, SHDocVw, StdCtrls, MSHTML, StrUtils, ActiveX,
      ExtCtrls;
    //---------------------------------------------------//
    //----------欢迎大家和我联系,软件开发 --------------//
    //---------------------------------------------------//
    type
      TF_map = class(TForm)
        grp1: TGroupBox;
        WebBrowser: TWebBrowser;
        grp2: TGroupBox;
        grp3: TGroupBox;
        grp4: TGroupBox;
        tmr1: TTimer;
        GroupBox1: TGroupBox;
        GroupBox2: TGroupBox;
        Edit1: TEdit;
        Edit2: TEdit;
        chk1: TCheckBox;
        Edit3: TEdit;
        Edit4: TEdit;
        edt1: TEdit;
        edt2: TEdit;
        edt3: TEdit;
        edt4: TEdit;
        procedure FormCreate(Sender: TObject);
        procedure btn1Click(Sender: TObject);
        procedure btn2Click(Sender: TObject);
        procedure FormShow(Sender: TObject);
        procedure btn3Click(Sender: TObject);
        procedure Button1Click(Sender: TObject);
        procedure loadweb();
        procedure btn4Click(Sender: TObject);
        procedure AppMsg(var Msg: TagMsg; var Handled: Boolean);
        procedure GetWebContent();
        procedure tmr1Timer(Sender: TObject);
      private
        { Private declarations }
        lng, lat: string;
      public
        { Public declarations }
      end;
    
    var
      F_map: TF_map;
      const
      Doc1: string = '<html>'
      + '<head>'
      + '<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />'
      + '<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />'
      + '<title>BAIDU MAP</title>'
      + '<style type="text/css">'
      + 'html{height:100%}' + 'body{height:100%;margin:0px;padding:0px}'
      + '#container{height:100%}'
      + '</style>'
      + '<script type="text/javascript"src="http://api.map.baidu.com/api?v=1.3"></script>'
      + '</head>'
      + '<body>'
      + '<div id="container"></div>'
      //style="visibility:hidden; display:none">
      +'<div id="centerweidu" style="visibility:hidden; display:none"></div>'
      +'<div id="centerjingdu" style="visibility:hidden; display:none"></div>'
      +'<div id="weidutemp" style="visibility:hidden;display:none"></div>'
      +'<div id="jingdutemp" style="visibility:hidden;display:none"></div>'
      +'<div id="weidu" style="visibility:hidden;display:none"></div>'
      +'<div id="jingdu" style="visibility:hidden;display:none"></div>'
      +'<div id="Distance" style="visibility:hidden;display:none"></div>'
      + '<script language="JavaScript" type="text/javascript">'
      + 'var map = new BMap.Map("container");'  // 创建地图实例
      + 'map.addControl(new BMap.NavigationControl());'
      + 'map.addControl(new BMap.ScaleControl());'
      + 'map.addControl(new BMap.OverviewMapControl());'
      + 'map.addControl(new BMap.MapTypeControl(BMAP_ANCHOR_BOTTOM_RIGHT));'   // 将标注添加到地图中
      + 'map.enableScrollWheelZoom();'                  // 启用滚轮放大缩小。
      + 'map.enableKeyboard();'                         // 启用键盘操作。
      + 'var centerpoint = new BMap.Point(126.666431,45.764502);' // 创建点坐标  126.666431, 45.764502
      + 'var marker = new BMap.Marker(centerpoint);'        // 创建标注
      + 'map.addOverlay(marker);'
      + 'var label = new BMap.Label("哈尔滨海铭科技有限公司",{offset:new BMap.Size(20,-10)});'
      + 'marker.setLabel(label);'
      +' map.centerAndZoom(centerpoint, 15);' // 初始化地图,设置中心点坐标和地图级别'
    
      +' map.addEventListener("mousemove", function(e){'
      +' document.getElementById("weidutemp").innerHTML = e.point.lng;'
      +' document.getElementById("jingdutemp").innerHTML =  e.point.lat;});'
      +' map.addEventListener("click", function(f){'
      +' document.getElementById("weidu").innerHTML = f.point.lng;'
      +' document.getElementById("jingdu").innerHTML =  f.point.lat;});'
    
      +'function SetCarCenterPoint(newlng,newlat){'
      +'centerpoint=new BMap.Point(newlng,newlat);'
      + 'var marker = new BMap.Marker(centerpoint);'
      + 'map.addOverlay(marker);'
      + 'var label = new BMap.Label("当前汽车坐标",{offset:new BMap.Size(20,-10)});'
      + 'marker.setLabel(label);'
      + 'map.panTo(centerpoint);'
      +'}'
    
      +'function SetAutoCenterPoint(newlng,newlat){'
      +'centerpoint=new BMap.Point(newlng,newlat);'
      + 'var marker = new BMap.Marker(centerpoint);'
      + 'map.addOverlay(marker);'
      + 'var label = new BMap.Label("4S店坐标",{offset:new BMap.Size(20,-10)});'
      + 'marker.setLabel(label);'
      + 'map.panTo(centerpoint);'
      +'}'
    
      +'function PrintLine(newlng,newlat,oldlng,oldlat,biaoji){'
      +'var point = new BMap.Point(newlng,newlat);' // 创建点坐标
      + 'map.panTo(point);'
    //  + 'if (biaoji=''0'')'
    //  +'{'
    //  + 'var marker = new BMap.Marker(point);'
    //  + 'map.addOverlay(marker);'
    //  +'}'
      + 'var polyline = new BMap.Polyline(['
      + 'new BMap.Point(oldlng,oldlat),'
      + 'new BMap.Point(point.lng, point.lat)'
      + '], {strokeColor:"blue", strokeWeight:4, strokeOpacity:0.5});'
      + 'map.addOverlay(polyline);'
      +'}'
    
      +'function GetCenter(){'
      +' var center = map.getCenter();'
      +' document.getElementById("centerweidu").innerHTML = center.lng;'
      +' document.getElementById("centerjingdu").innerHTML = center.lat;'
      +'}'
      +'function Distance(newlng,newlat){'
      +'var pointA=centerpoint;'
      +'var pointB=new BMap.Point(newlng,newlat);'
      +'document.getElementById("Distance").innerHTML = map.getDistance(pointA,pointB);'
      +'alert(''距离是:''+map.getDistance(pointA,pointB)+'' 米。'');'
     // +'return map.getDistance(pointA,pointB);'
      +'}'
      + '</script>'
      + '</body>'
      + '</html>';
    implementation
    
    {$R *.dfm}
    
    procedure TF_map.AppMsg(var Msg: TagMsg; var Handled: Boolean);
    var
      mPoint: TPoint;
    begin
      if IsChild(WebBrowser.Handle, Msg.Hwnd) and (Msg.Message = WM_MOUSEMOVE) then
      begin
        GetCursorPos(mPoint);
        GetWebContent;
        Handled := True;
      end;
    end;
    
    function JavaScript(j: string): Boolean;
    begin
      try
        // (F_map.WebBrowser.Document as IHTMLDocument2).parentWindow.execScript(j, 'JavaScript');
        F_map.WebBrowser.OleObject.Document.parentWindow.execScript(j,
          'JavaScript');
        Result := True;
      except
        Result := false;
      end;
    end;
    
    procedure TF_map.btn1Click(Sender: TObject);
    var
      str: string;
    begin
      self.WebBrowser.OleObject.Document.parentWindow.execScript('GetCenter()',
        'JavaScript');
    end;
    
    procedure TF_map.btn2Click(Sender: TObject);
    var
      str: string;
    begin
      if (Edit1.Text <> '') and (Edit2.Text <> '') then
      begin
        self.WebBrowser.OleObject.Document.parentWindow.execScript
          ('Distance(' + Edit1.Text + ',' + Edit2.Text + ')', 'JavaScript');
      end;
    end;
    
    procedure TF_map.btn3Click(Sender: TObject);
    var
      biaoji: string;
    begin
      if lng = '' then
      begin
        lng := '126.666431'; // 126.666431,45.764502
      end;
      if lat = '' then
      begin
        lat := '45.764502';
      end;
      if chk1.Checked then
      begin
        biaoji := '1';
      end
      else
      begin
        biaoji := '0';
      end;
      if (Edit1.Text <> '') and (Edit2.Text <> '') then
      begin
        self.WebBrowser.OleObject.Document.parentWindow.execScript
          ('PrintLine(' + Edit1.Text + ',' + Edit2.Text + ',' + lng + ',' + lat +
            ',' + biaoji + ')', 'JavaScript');
        lng := self.Edit1.Text;
        lat := self.Edit2.Text;
      end;
    end;
    
    procedure TF_map.btn4Click(Sender: TObject);
    begin
      loadweb;
      lng := '';
      lat := '';
    end;
    
    procedure TF_map.Button1Click(Sender: TObject);
    var
      str: string;
    begin
      if (Edit3.Text <> '') and (Edit4.Text <> '') then
      begin
        self.WebBrowser.OleObject.Document.parentWindow.execScript
          ('SetAutoCenterPoint(' + Edit3.Text + ',' + Edit4.Text +
            ')', 'JavaScript');
      end;
    end;
    
    procedure TF_map.loadweb();
    var
      sl: TStringList;
      ms: TMemoryStream;
    begin
      self.WebBrowser.Silent := True;
      WebBrowser.Navigate('about:blank'); (WebBrowser.Document as IHTMLDocument2)
      .URL := 'http://127.0.0.1/';
      while WebBrowser.ReadyState < READYSTATE_INTERACTIVE do
        Application.ProcessMessages;
      if Assigned(WebBrowser.Document) then
      begin
        sl := TStringList.Create;
        try
          ms := TMemoryStream.Create;
          try
            sl.Text := Doc1;
            sl.SaveToStream(ms);
            ms.Seek(0, 0); (WebBrowser.Document as IPersistStreamInit)
            .Load(TStreamAdapter.Create(ms));
          finally
            ms.Free;
          end;
        finally
          sl.Free;
        end;
      end;
    end;
    
    procedure TF_map.tmr1Timer(Sender: TObject);
    begin
      GetWebContent;
    end;
    
    procedure TF_map.FormCreate(Sender: TObject);
    begin
      loadweb;
      //Application.OnMessage:=AppMsg;
    end;
    
    procedure TF_map.FormShow(Sender: TObject);
    begin
      lng := '';
      lat := '';
      tmr1.Enabled := True;
    end;
    
    procedure TF_map.GetWebContent();
    var
      html: IHTMLDocument2; // 定义网页元素
      submitbutton: OleVariant; // 定义按钮
      centerweidu, centerjingdu, weidu, jingdu, weidutemp,
        jingdutemp: IHTMLElement; // 定义网页输入元素
    begin
      try
        html := self.WebBrowser.Document as IHTMLDocument2;
        centerweidu := html.all.item('centerweidu', 0) as IHTMLElement;
        centerjingdu := html.all.item('centerjingdu', 0) as IHTMLElement;
        weidu := html.all.item('weidu', 0) as IHTMLElement;
        jingdu := html.all.item('jingdu', 0) as IHTMLElement;
        weidutemp := html.all.item('weidutemp', 0) as IHTMLElement;
        jingdutemp := html.all.item('jingdutemp', 0) as IHTMLElement;
        edt1.Text := centerweidu.innerText;
        edt2.Text := centerjingdu.innerText;
        edt3.Text := weidutemp.innerText;
        edt4.Text := jingdutemp.innerText;
        Edit1.Text := weidu.innerText;
        Edit2.Text := jingdu.innerText;
      except
      end;
    end;
    
    end.
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  • 原文地址:https://www.cnblogs.com/westsoft/p/8353111.html
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