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(∩_∩)O~
3) 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: /// <summary><summary><summary> 2: /// 重新改变GoogleEarth视图的大小 3: /// </summary></summary> 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: /// <summary> 2: /// 鼠标钩子 3: /// </summary> 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: /// <summary><summary><summary> 2: /// 鼠标钩子。鼠标单击事件 3: /// </summary></summary> 4: /// <param name="sender"></param> 5: /// <param name="e"></param> 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: /// <summary><summary><summary> 2:/// 鼠标钩子。鼠标双击事件 3:/// </summary> 4:/// <param name="sender"></param> 5:/// <param name="e"></param> 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(∩_∩)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：
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 DC15: IntPtr hRenderDC = NativeMethods.GetWindowDC(hRender);16: // 创建hBitmap17: IntPtr hBitmap = NativeMethods.CreateCompatibleBitmap(hRenderDC, nWidth, nHeight);18: // 创建MEM DC19: IntPtr hMemDC = NativeMethods.CreateCompatibleDC(hRenderDC);20: // 将Bitmap Select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(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JPG39: if (sfd.FilterIndex == 0)40: {41: imgFormat = ImageFormat.Jpeg;42: }43: // 选择PNG44: else45: {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！
https://files.cnblogs.com/wpwen/GEDemo_2009-05-22.rar
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