C# 调用 Google Earth Com API开发（三）(转载)
2010-04-28 23:48
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原文地址：/article/5800966.html
好久没有更新《C#调用GoogleEarthComAPI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(∩_∩)O~
3)实现GoogleEarth彩色截图（测试环境：Windows2003Server，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
[/code]
好久没有更新《C#调用GoogleEarthComAPI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(∩_∩)O~
3)实现GoogleEarth彩色截图（测试环境：Windows2003Server，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
[code]1:///<summary>
2:///重新改变GoogleEarth视图的大小
3:///</summary>
4:privatevoidResizeGoogleControl()
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(GEHrender,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,newHeight,
22:NativeMethods.SWP_FRAMECHANGED);
23:
24:NativeMethods.SendMessage(GEHWnd,(uint)NativeMethods.WM_COMMAND,NativeMethods.WM_SIZE,0);
25:}
[/code]
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。
///<summary>
[code]///鼠标钩子
///</summary>
privateMouseHookmouseHook;
//设置鼠标钩子
mouseHook=newMouseHook();
mouseHook.MouseClick+=newMouseEventHandler(mouseHook_MouseClick);
mouseHook.MouseDbClick+=newMouseEventHandler(mouseHook_MouseDbClick);
mouseHook.MouseWheel+=newMouseEventHandler(mouseHook_MouseWheel);
//启动鼠标钩子
mouseHook.StartHook(HookType.WH_MOUSE_LL,0);
[/code]
单击事件：
[code]1:///<summary>
2:///鼠标钩子。鼠标单击事件
3:///</summary>
4:///<paramname="sender"></param>
5:///<paramname="e"></param>
6:voidmouseHook_MouseClick(objectsender,MouseEventArgse)
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=((GERenderPanel)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:DoublePointdp=(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:}
[/code]
双击事件：
[code]1:///<summary>
2:///鼠标钩子。鼠标双击事件
3:///</summary>
4:///<paramname="sender"></param>
5:///<paramname="e"></param>
6:voidmouseHook_MouseDbClick(objectsender,MouseEventArgse)
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("xx双击了GoogleEarth...");16:
17:DoublePointdp=((GERenderPanel)Control).DetermineScreenCoordinates(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;
32: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:}
[/code]
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(∩_∩)O~
3、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：
[code]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:sfd.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:}
[/code]
2)彩色截图：
[code]1:GEViewContentview=GetGEView();
2:if(view!=null)
3:{4:intnWidth=view.Control.Width;
5:intnHeight=view.Control.Height;
6:Pointpt=view.Control.PointToScreen(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RenderDC
15:IntPtrhRenderDC=NativeMethods.GetWindowDC(hRender);
16://创建hBitmap
17:IntPtrhBitmap=NativeMethods.CreateCompatibleBitmap(hRenderDC,nWidth,nHeight);
18://创建MEMDC
19:IntPtrhMemDC=NativeMethods.CreateCompatibleDC(hRenderDC);
20://将BitmapSelect到MemDC
21: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=newSaveFileDialog())
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JPG
39:if(sfd.FilterIndex==0)
40:{41:imgFormat=ImageFormat.Jpeg;
42:}
43://选择PNG
44:else
45:{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:}
[/code]
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！
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