C#调用Google_Earth.doc

C#调用Google Earth COM API开发（一） 2009-07-18 来自： 字体大小：【大中小】 摘要：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。 -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：/earth/documentation/?hl=zh-cnC#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Windows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：GE COM API 网址：/comapi/index.html 3: / 作者：温伟鹏 4: / 日期：2008-01-20 5: 6: using System; 7: using System.Collections.Generic; 8: using System.ComponentModel; 9: using System.Data; 10: using System.Drawing; 11: using System.Text; 12: using System.Windows.Forms; 13: using EARTHLib; 14: using System.Runtime.InteropServices; 15: using System.IO; 16: using System.Diagnostics; 17: 18: namespace GEDemo 19: 20: public partial class Form1 : Form 21: 22: / 23: / 标记GE是否已经启动 24: / 25: private bool isGeStarted = false; 26: / 27: / 定义GE应用程序类 28: / 29: private ApplicationGEClass GeApp; 30: 31: public Form1() 32: 33: InitializeComponent(); 34: 35: 36: private void button1_Click(object sender, EventArgs e) 37: 38: StartGE(); 39: 40: 41: / 42: / 启动GE 43: / 44: private void StartGE() 45: 46: if (isGeStarted) 47: 48: return; 49: 50: 51: try 52: 53: GeApp = (ApplicationGEClass)Marshal.GetActiveObject(GoogleEarth.Application); 54: 55: isGeStarted = true; 56: 57: catch 58: 59: GeApp = new ApplicationGEClass(); 60: 61: isGeStarted = true; 62: 63: 64: 65: private void button2_Click(object sender, EventArgs e) 66: 67: string ssFile = Path.Combine(Application.StartupPath, ScreenShot.jpg); 68: 69: try 70: 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(Exception ex) 77: 78: MessageBox.Show(保存截屏图像时发生错误： + ex.Message); 79: 80: 81: 82: private void button3_Click(object sender, EventArgs e) 83: 84: string ssFile = Path.Combine(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: private void button4_Click(object sender, EventArgs e) 96: 97: this.Close(); 98: Application.Exit(); 99: 100: 101: C# 调用 Google Earth Com API开发（二）继C#调用GoogleEarth Com API开发（一），我Neil又带给大家第二篇文章。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：GE COM API 网址：/comapi/index.html 3: / 作者：温伟鹏 4: / 日期：2009-02-08 5: 6: using System; 7: using System.Collections.Generic; 8: using System.ComponentModel; 9: using System.Data; 10: using System.Drawing; 11: using System.Text; 12: using System.Windows.Forms; 13: using EARTHLib; 14: 15: namespace GEDemo 16: 17: public partial class Form2 : Form 18: 19: / 20: / 用来关闭GoogleEarth的消息定义 21: / 22: static readonly Int32 WM_QUIT = 0x0012; 23: 24: private IntPtr GEHWnd = (IntPtr)5; 25: private IntPtr GEHrender = (IntPtr)5; 26: private IntPtr GEParentHrender = (IntPtr)5; 27: / 28: / 定义GE应用程序类 29: / 30: private ApplicationGEClass GeApp; 31: 32: public Form2() 33: 34: InitializeComponent(); 35: 36: 37: protected override void OnLoad(EventArgs e) 38: 39: base.OnLoad(e); 40: 41: if (!this.DesignMode) 42: 43: GeApp = new ApplicationGEClass(); 44: 45: GEHWnd = (IntPtr)GeApp.GetMainHwnd(); 46: 47: NativeMethods.SetWindowPos(GEHWnd, 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.SetParent(GEHrender, this.Handle); 56: 57: 58: 59: protected override void OnClosing(CancelEventArgs e) 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：Windows API调用 2: / 描述：大家可以参照MSDN 3: / 作者：温伟鹏 4: / 日期：2009-02-08 5: 6: using System; 7: using System.Collections.Generic; 8: using System.Text; 9: using System.Runtime.InteropServices; 10: 11: namespace GEDemo 12: 13: public class NativeMethods 14: 15: DllImport(user32.dll, CharSet = CharSet.Auto, SetLastError = true) 16: public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, UInt32 uflags); 17: 18: DllImport(user32.dll, CharSet = CharSet.Auto) 19: public static extern IntPtr PostMessage(int hWnd, int msg, int wParam, int lParam); 20: 21: #region 预定义 22: 23: public static readonly IntPtr HWND_BOTTOM = new IntPtr(1); 24: public static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2); 25: public static readonly IntPtr HWND_TOP = new IntPtr(0); 26: public static readonly IntPtr HWND_TOPMOST = new IntPtr(-1); 27: public static readonly UInt32 SWP_NOSIZE = 1; 28: public static readonly UInt32 SWP_NOMOVE = 2; 29: public static readonly UInt32 SWP_NOZORDER = 4; 30: public static readonly UInt32 SWP_NOREDRAW = 8; 31: public static readonly UInt32 SWP_NOACTIVATE = 16; 32: public static readonly UInt32 SWP_FRAMECHANGED = 32; 33: public static readonly UInt32 SWP_SHOWWINDOW = 64; 34: public static readonly UInt32 SWP_HIDEWINDOW = 128; 35: public static readonly UInt32 SWP_NOCOPYBITS = 256; 36: public static readonly UInt32 SWP_NOOWNERZORDER = 512; 37: public static readonly UInt32 SWP_NOSENDCHANGING = 1024; 38: 39: #endregion 40: 41: public delegate int EnumWindowsProc(IntPtr hwnd, int lParam); 42: 43: DllImport(user32, CharSet = CharSet.Auto) 44: public extern static IntPtr GetParent(IntPtr hWnd); 45: 46: DllImport(user32, CharSet = CharSet.Auto) 47: public extern static bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint); 48: 49: DllImport(user32, CharSet = CharSet.Auto) 50: public extern static IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent); 51: 52: DllImport(user32.dll, ExactSpelling = true, CharSet = CharSet.Auto) 53: public static extern IntPtr GetWindow(IntPtr hWnd, int uCmd); 54: 55: public static int GW_CHILD = 5; 56: public static int GW_HWNDNEXT = 2; 57: 58: 3、执行效果： C# 调用 Google Earth Com API开发（三）好久没有更新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: private void ResizeGoogleControl() 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: RECT mainRect = new RECT(); 10: NativeMethods.GetWindowRect(GEHWnd, out mainRect); 11: clientRect = new RECT(); 12: NativeMethods.GetClientRect(GEHrender, out clientRect); 13: 14: int offsetW = mainRect.Width - clientRect.Width; 15: int offsetH = mainRect.Height - clientRect.Height; 16: 17: int newWidth = this.Control.Width + (int)offsetW; 18: int newHeight = 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: 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: private MouseHook mouseHook; 5: 6: / 设置鼠标钩子 7: mouseHook = new MouseHook(); 8: mouseHook.MouseClick += new MouseEventHandler(mouseHook_MouseClick); 9: mouseHook.MouseDbClick += new MouseEventHandler(mouseHook_MouseDbClick); 10: mouseHook.MouseWheel += new MouseEventHandler(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: void mouseHook_MouseClick(object sender, MouseEventArgs e) 7: 8: IntPtr hWnd = NativeMethods.WindowFromPoint(e.Location); 9: if (hWnd = this.GeRenderHWnd) 10: 11: Point point = 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: DoublePoint dp = (GERenderPanel)Control).DetermineScreenCoordinates(point.X, point.Y); 18: 19: ParameterizedThreadStart pts = new ParameterizedThreadStart(ShowMouseClickPoint); 20: 21: Thread thread = new Thread(pts); 22: thread.Start(dp); 23: 24: 25: 26: 27: 28: protected void ShowMouseClickPoint(object obj) 29: 30: /Thread.Sleep(20); 31: DoublePoint dp = (DoublePoint)obj; 32: PointOnTerrainGE pGe = 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: void mouseHook_MouseDbClick(object sender, MouseEventArgs e) 7: 8: IntPtr hWnd = NativeMethods.WindowFromPoint(e.Location); 9: if (hWnd = this.GeRenderHWnd) 10: 11: Point point = 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: DoublePoint dp = (GERenderPanel)Control).DetermineScreenCoordinates(point.X, point.Y); 18: 19: ParameterizedThreadStart pts = new ParameterizedThreadStart(ShowMouseDbClickPoint); 20: 21: Thread thread = new Thread(pts); 22: thread.Start(dp); 23: 24: 25: 26: 27: 28: protected void ShowMouseDbClickPoint(object obj) 29: 30: /Thread.Sleep(20); 31: DoublePoint dp = (DoublePoint)obj; 32: PointOnTerrainGE pGe = 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: GEViewContent view = GetGEView(); 2: 3: if (view != null) 4: 5: ApplicationGE ge = view.GeApplication; 6: if (ge != null & ge.IsInitialized() 0) 7: 8: using (SaveFileDialog sfd = new SaveFileDialog() 9: 10: sfd.Filter = jpg图片|*.jpg; 11: sfd.AddExtension = true; 12: sfd.CheckPathExists = true; 13: sfd.Title = 保存Google Earth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: GEViewContent view = GetGEView(); 2: if (view != null) 3: 4: int nWidth = view.Control.Width; 5: int nHeight = view.Control.Height; 6: Point pt = view.Control.PointToScreen(view.Control.Location); 7: int nXSrc = pt.X; 8: int nYSrc = pt.Y; 9: 10: IntPtr hRender = view.GeRenderHWnd; 11: 12: if (hRender != IntPtr.Zero) 13: 14: / 取得Render DC 15: IntPtr hRenderDC = NativeMethods.GetWindowDC(hRender); 16: / 创建hBitmap 17: IntPtr hBitmap = NativeMethods.CreateCompatibleBitmap(hRenderDC, nWidth, nHeight); 18: / 创建MEM DC 19: IntPtr hMemDC = NativeMethods.CreateCompatibleDC(hRenderDC); 20: / 将Bitmap Select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(Bitmap bmp = Bitmap.FromHbitmap(hBitmap) 27: 28: using(SaveFileDialog sfd = new SaveFileDialog() 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Google Earth截图; 34: 35: if (sfd.ShowDialog() = DialogResult.OK) 36: 37: ImageFormat imgFormat = 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: 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！/wpwen/GEDemo_2009-05-22.rar C# 调用 Google Earth Com API开发（四）本篇继续介绍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_MouseWheel); 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 =