C#调用 GoogleEarth COM API开发

1、c#调用 googleearth com api开发一、准备google earth提供了个人免费版、plus版、pro版，个人开发只安装个人免费版就可以了，如果需要更多的功能，那么只有每年上交$400购买专业版了到目前为止，googleearth的二次开发接口还比较少，功能太弱，仅仅提供了1.0的类库。googleearth com api参考文档可以在这里找到：c#调用com的参考资料多如牛毛，大家可以到网上搜一下二、例子这里提供一个利用vs2008 + google earth 5.0开发一个“hello world”程序首先，确保已经正确安装ge，打开vs2008 ，新建一个windo

2、ws应用程序项目，在“项目”菜单中选择“添加引用”，切换到“com”选项卡，选择“google earth 1.0 type library”，其实就是google earth的主程序在项目的引用中你可以看到已经添加了一个earthlib的引用，然后我们就可以调用其中的接口进行开发了。下面就是小例子的代码（功能很简单，只有三个，打开ge，然后让ge保存一张截图，然后可以打开这个截图看看。呵呵） 1:/功能：ge实例2:/描述：gecomapi网址：3:/作者：温伟鹏4:/日期：2008-01-205:6:usingsystem;7:usingsystem.collections.generic

3、;8:usingsystem.componentmodel;9:usingsystem.data;10:usingsystem.drawing;11:usingsystem.text;12:usingsystem.windows.forms;13:usingearthlib;14:usingsystem.runtime.interopservices;15:usingsystem.io;16:usingsystem.diagnostics;17:18:namespacegedemo19:20:publicpartialclassform1:form21:22:/23:/标记ge是否已经启动24

4、:/25:privateboolisgestarted=false;26:/27:/定义ge应用程序类28:/29:privateapplicationgeclassgeapp;30:31:publicform1()32:33:initializecomponent();34:35:36:privatevoidbutton1_click(objectsender,eventargse)37:38:startge();39:40:41:/42:/启动ge43:/44:privatevoidstartge()45:46:if(isgestarted)47:48:return;49:50:51:tr

5、y52:53:geapp=(applicationgeclass)marshal.getactiveobject(googleearth.application);54:55:isgestarted=true;56:57:catch58:59:geapp=newapplicationgeclass();60:61:isgestarted=true;62:63:64:65:privatevoidbutton2_click(objectsender,eventargse)66:67:stringssfile=path.combine(application.startuppath,screensh

6、ot.jpg);68:69:try70:71:/quality的取值范围在(0,100)之间，质量越高，quality越大72:geapp.savescreenshot(ssfile,100);73:74:messagebox.show(成功保存截屏图像：+ssfile);75:76:catch(exceptionex)77:78:messagebox.show(保存截屏图像时发生错误：+ex.message);79:80:81:82:privatevoidbutton3_click(objectsender,eventargse)83:84:stringssfile=path.combine

7、(application.startuppath,screenshot.jpg);85:86:if(!file.exists(ssfile)87:88:messagebox.show(未能找到保存的截屏图像！);89:return;90:91:92:process.start(ssfile);93:94:95:privatevoidbutton4_click(objectsender,eventargse)96:97:this.close();98:application.exit();99:100:101:102:继c#调用googleearth com api开发（一），我neil又带给大

8、家第二篇文章。这一篇文章在第一篇的基础上，展示如何调用windows api将googleearth的界面隐藏掉，并将googleearth的地图显示在自定义的窗体上。废话少说，直接上代码。1、主窗口代码：1:/功能：ge实例(二)2:/描述：gecomapi网址：3:/作者：温伟鹏4:/日期：2009-02-085:6:usingsystem;7:usingsystem.collections.generic;8:usingsystem.componentmodel;9:usingsystem.data;10:usingsystem.drawing;11:usingsystem.text;1

9、2:usingsystem.windows.forms;13:usingearthlib;14:15:namespacegedemo16:17:publicpartialclassform2:form18:19:/20:/用来关闭googleearth的消息定义21:/22:staticreadonlyint32wm_quit=0x0012;23:24:privateintptrgehwnd=(intptr)5;25:privateintptrgehrender=(intptr)5;26:privateintptrgeparenthrender=(intptr)5;27:/28:/定义ge应用

10、程序类29:/30:privateapplicationgeclassgeapp;31:32:publicform2()33:34:initializecomponent();35:36:37:protectedoverridevoidonload(eventargse)38:39:base.onload(e);40:41:if(!this.designmode)42:43:geapp=newapplicationgeclass();44:45:gehwnd=(intptr)geapp.getmainhwnd();46:47:nativemethods.setwindowpos(gehwnd,

11、nativemethods.hwnd_bottom,0,0,0,0,48:nativemethods.swp_nosize+nativemethods.swp_hidewindow);49:50:gehrender=(intptr)geapp.getrenderhwnd();51:geparenthrender=(intptr)nativemethods.getparent(gehrender);52:53:nativemethods.movewindow(gehrender,0,0,this.width,this.height,true);54:55:nativemethods.setpar

12、ent(gehrender,this.handle);56:57:58:59:protectedoverridevoidonclosing(canceleventargse)60:61:base.onclosing(e);62:63:nativemethods.postmessage(geapp.getmainhwnd(),wm_quit,0,0);64:65:66:2、nativemethods类定义：1:/功能：windowsapi调用2:/描述：大家可以参照msdn3:/作者：温伟鹏4:/日期：2009-02-085:6:usingsystem;7:usingsystem.collect

13、ions.generic;8:usingsystem.text;9:usingsystem.runtime.interopservices;10:11:namespacegedemo12:13:publicclassnativemethods14:15:dllimport(user32.dll,charset=charset.auto,setlasterror=true)16:publicstaticexternboolsetwindowpos(intptrhwnd,intptrhwndinsertafter,intx,inty,intcx,intcy,uint32uflags);17:18:

14、dllimport(user32.dll,charset=charset.auto)19:publicstaticexternintptrpostmessage(inthwnd,intmsg,intwparam,intlparam);20:21:#region预定义22:23:publicstaticreadonlyintptrhwnd_bottom=newintptr(1);24:publicstaticreadonlyintptrhwnd_notopmost=newintptr(-2);25:publicstaticreadonlyintptrhwnd_top=newintptr(0);2

15、6:publicstaticreadonlyintptrhwnd_topmost=newintptr(-1);27:publicstaticreadonlyuint32swp_nosize=1;28:publicstaticreadonlyuint32swp_nomove=2;29:publicstaticreadonlyuint32swp_nozorder=4;30:publicstaticreadonlyuint32swp_noredraw=8;31:publicstaticreadonlyuint32swp_noactivate=16;32:publicstaticreadonlyuin

16、t32swp_framechanged=32;33:publicstaticreadonlyuint32swp_showwindow=64;34:publicstaticreadonlyuint32swp_hidewindow=128;35:publicstaticreadonlyuint32swp_nocopybits=256;36:publicstaticreadonlyuint32swp_noownerzorder=512;37:publicstaticreadonlyuint32swp_nosendchanging=1024;38:39:#endregion40:41:publicde

17、legateintenumwindowsproc(intptrhwnd,intlparam);42:43:dllimport(user32,charset=charset.auto)44:publicexternstaticintptrgetparent(intptrhwnd);45:46:dllimport(user32,charset=charset.auto)47:publicexternstaticboolmovewindow(intptrhwnd,intx,inty,intnwidth,intnheight,boolbrepaint);48:49:dllimport(user32,c

18、harset=charset.auto)50:publicexternstaticintptrsetparent(intptrhwndchild,intptrhwndnewparent);51:52:dllimport(user32.dll,exactspelling=true,charset=charset.auto)53:publicstaticexternintptrgetwindow(intptrhwnd,intucmd);54:55:publicstaticintgw_child=5;56:publicstaticintgw_hwndnext=2;57:58:3、执行效果：好久没有更

19、新c#调用google earth com api开发系列文章了，今天带给大家的是第三篇，本篇相对于第二篇主要改进了三个方面。1) 实现googleearth显示画面随窗口大小改变而改变2) 截获googleearth鼠标消息，实现单击、双击功能；鼠标滚轮缩放现在只能放大！o(_)o3) 实现googleearth彩色截图（测试环境：windows 2003 server ，vista与win7中不可用，xp未测）下面还是继续看代码：1、googleearth动态改变大小1:/2:/重新改变googleearth视图的大小3:/4:privatevoidresizegooglecontrol(

20、)5:6:nativemethods.sendmessage(gehwnd,(uint)nativemethods.wm_command,nativemethods.wm_paint,0);7:nativemethods.postmessage(gehwnd,nativemethods.wm_qt_paint,0,0);8:9:rectmainrect=newrect();10:nativemethods.getwindowrect(gehwnd,outmainrect);11:clientrect=newrect();12:nativemethods.getclientrect(gehren

21、der,outclientrect);13:14:intoffsetw=mainrect.width-clientrect.width;15:intoffseth=mainrect.height-clientrect.height;16:17:intnewwidth=this.control.width+(int)offsetw;18:intnewheight=this.control.height+(int)offseth;19:20:nativemethods.setwindowpos(gehwnd,nativemethods.hwnd_top,21:0,0,newwidth,newhei

22、ght,22:nativemethods.swp_framechanged);23:24:nativemethods.sendmessage(gehwnd,(uint)nativemethods.wm_command,nativemethods.wm_size,0);25:2、鼠标消息此例子中对于鼠标消息到处理使用了钩子，调用hookapi.dll实现。1:/2:/鼠标钩子3:/4:privatemousehookmousehook;5:6:/设置鼠标钩子7:mousehook=newmousehook();8:mousehook.mouseclick+=newmouseeventhandle

23、r(mousehook_mouseclick);9:mousehook.mousedbclick+=newmouseeventhandler(mousehook_mousedbclick);10:mousehook.mousewheel+=newmouseeventhandler(mousehook_mousewheel);11:/启动鼠标钩子12:mousehook.starthook(hooktype.wh_mouse_ll,0);单击事件：1:/2:/鼠标钩子。鼠标单击事件3:/4:/5:/6:voidmousehook_mouseclick(objectsender,mouseeven

24、targse)7:8:intptrhwnd=nativemethods.windowfrompoint(e.location);9:if(hwnd=this.gerenderhwnd)10:11:pointpoint=this.control.pointtoclient(e.location);12:/如果鼠标击点位置在控件内部，则说明鼠标点击了googleearth视图13:if(this.control.clientrectangle.contains(point)14:15:console.writeline(点击了googleearth.);16:17:doublepointdp=(g

25、erenderpanel)control).determinescreencoordinates(point.x,point.y);18:19:parameterizedthreadstartpts=newparameterizedthreadstart(showmouseclickpoint);20:21:threadthread=newthread(pts);22:thread.start(dp);23:24:25:26:27:28:protectedvoidshowmouseclickpoint(objectobj)29:30:/thread.sleep(20);31:doublepoi

26、ntdp=(doublepoint)obj;32:pointonterraingepge=geapp.getpointonterrainfromscreencoords(dp.x,dp.y);33:console.writeline(鼠标点击了：lnt=+pge.longitude.tostring()34:+;lat=+pge.latitude.tostring();35:双击事件：1:/2:/鼠标钩子。鼠标双击事件3:/4:/5:/6:voidmousehook_mousedbclick(objectsender,mouseeventargse)7:8:intptrhwnd=nativem

27、ethods.windowfrompoint(e.location);9:if(hwnd=this.gerenderhwnd)10:11:pointpoint=this.control.pointtoclient(e.location);12:/如果鼠标击点位置在控件内部，则说明鼠标点击了googleearth视图13:if(this.control.clientrectangle.contains(point)14:15:console.writeline(xx双击了googleearth.);16:17:doublepointdp=(gerenderpanel)control).deter

28、minescreencoordinates(point.x,point.y);18:19:parameterizedthreadstartpts=newparameterizedthreadstart(showmousedbclickpoint);20:21:threadthread=newthread(pts);22:thread.start(dp);23:24:25:26:27:28:protectedvoidshowmousedbclickpoint(objectobj)29:30:/thread.sleep(20);31:doublepointdp=(doublepoint)obj;3

29、2:pointonterraingepge=geapp.getpointonterrainfromscreencoords(dp.x,dp.y);33:console.writeline(xx鼠标双击了：lnt=+pge.longitude.tostring()34:+;lat=+pge.latitude.tostring();35:36:messagebox.show(我还是出来一下吧！省得你不知道你已经双击了鼠标！);37:这两处代码还比较简陋，比如未添加主窗口焦点检测，相信读者可以自行添加。o(_)o3、截图程序中有两种截图功能，一种是googleearth自带的截图功能，只能截取黑白图

30、片；另一种为彩色截图，但是vista以上操作系统不支持，还未找到合适的方法实现vista与win7兼容。1) googleearth自带截图功能：1:geviewcontentview=getgeview();2:3:if(view!=null)4:5:applicationgege=view.geapplication;6:if(ge!=null&ge.isinitialized()0)7:8:using(savefiledialogsfd=newsavefiledialog()9:10:sfd.filter=jpg图片|*.jpg;11:sfd.addextension=true;12:s

31、fd.checkpathexists=true;13:sfd.title=保存googleearth截图;14:15:if(sfd.showdialog()=dialogresult.ok)16:17:ge.savescreenshot(sfd.filename,100);18:19:20:21:2) 彩色截图：1:geviewcontentview=getgeview();2:if(view!=null)3:4:intnwidth=view.control.width;5:intnheight=view.control.height;6:pointpt=view.control.pointt

32、oscreen(view.control.location);7:intnxsrc=pt.x;8:intnysrc=pt.y;9:10:intptrhrender=view.gerenderhwnd;11:12:if(hrender!=intptr.zero)13:14:/取得renderdc15:intptrhrenderdc=nativemethods.getwindowdc(hrender);16:/创建hbitmap17:intptrhbitmap=nativemethods.createcompatiblebitmap(hrenderdc,nwidth,nheight);18:/创建

33、memdc19:intptrhmemdc=nativemethods.createcompatibledc(hrenderdc);20:/将bitmapselect到memdc21:nativemethods.selectobject(hmemdc,hbitmap);22:/直接拷屏23:nativemethods.bitblt(hmemdc,0,0,nwidth,nheight,24:hrenderdc,0,0,13369376);25:26:using(bitmapbmp=bitmap.fromhbitmap(hbitmap)27:28:using(savefiledialogsfd=ne

34、wsavefiledialog()29:30:sfd.filter=jpg图片|*.jpg|png图片|*.png;31:sfd.addextension=true;32:sfd.checkpathexists=true;33:sfd.title=保存googleearth截图;34:35:if(sfd.showdialog()=dialogresult.ok)36:37:imageformatimgformat=null;38:/默认选择jpg39:if(sfd.filterindex=0)40:41:imgformat=imageformat.jpeg;42:43:/选择png44:els

35、e45:46:imgformat=imageformat.png;47:48:bmp.save(sfd.filename,imgformat);49:50:51:52:/销毁资源53:nativemethods.deletedc(hrenderdc);54:nativemethods.deletedc(hmemdc);55:56:ok，这篇ge开发到此为止，请读者继续等待后面的精彩文章不好意思，刚才忘记上传源程序了！图片看不清楚？请点击这里查看原图（大图）。图片看不清楚？请点击这里查看原图（大图）。篇继续介绍google earth com api开发的基础知识，相对第三篇的改进如下：1)增加

36、鼠标滚轮支持，可以实现放大、缩小。此功能利用上一篇提供的hookapi.dll实现2)读取placemarks（google earth界面中的位置）并显示、隐藏3)读取所有图层，显示并隐藏下面，继续放代码：1、鼠标滚轮事件，实现放大、缩小1: . 2: / 放大 3: private const long zoomin = 0x00780000; 4: / 缩小 5: private const long zoomout = 0xff880000; 6: . 7: mousehook.mousewheel += new mouseeventhandler(mousehook_mousewhe

37、el); 8: . 9: / 10: / 鼠标钩子。鼠标滚动事件 11: / 12: / 13: / 14: void mousehook_mousewheel(object sender, mouseeventargs e) 15: 16: intptr hwnd = nativemethods.windowfrompoint(e.location); 17: if (hwnd = this.gerenderhwnd) 18: 19: point point = this.control.pointtoclient(e.location); 20: / 如果鼠标位置在控件内部，则说明鼠标在g

38、oogleearth视图范围内进行了滚动 21: if (this.control.clientrectangle.contains(point) 22: 23: nativemethods.postmessage(gerenderhwnd, (int)wm_mouse.wm_mousewheel, e.delta = 120 ? zoomin : zoomout, 0); 24: 25: 待添加的隐藏文字内容2 26: 2、读取placemarksgoogle earth com api中提供了两个读取placemarks的函数。一个是gettemporaryplaces()，用来读取临时位

39、置；另一个是getmyplaces()，用来读取自定义位置，即googleearth中显示的“我的位置”。呵呵 1: . 2: / 3: / 显示位置“placemarks”。位置分为两种，一种时temporaryplaces，另一种为myplaces 4: / 5: protected void showplaces() 6: 7: thread.sleep(500); 8: / 获取myplaces 9: featurege myplace = geapp.getmyplaces(); 10: / 获取临时位置 11: featurege temporaryplace = geapp.ge

40、ttemporaryplaces(); 12: / 13: list places = new list(); 14: places.add(myplace); 15: places.add(temporaryplace); 16: 17: / 获取工具面板 18: getoolpad toolpad = gettoolpad(); 19: / 显示所有位置 20: toolpad.showplaces(places); 21: 22: . 23: / 24: / 显示所有placemarks（位置） 25: / 26: / 27: public void showplaces(list 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: / 47: / 显示所有pl