3、截圖
程序中有兩種截圖功能，一種是GoogleEarth自帶的截圖功能，只能截取黑白圖片；另一種為彩色截圖 ，但是Vista以上操作系統不支持，還未找到合適的方法實現Vista與Win7兼容。
1) GoogleEarth自帶截圖功能：
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圖片|*.jpg";
11: sfd.AddExtension = true;
12: sfd.CheckPathExists = true;
13: sfd.Title = "保存Google Earth截圖";
14:
15: if (sfd.ShowDialog() == DialogResult.OK)
16: {
17: ge.SaveScreenShot(sfd.FileName, 100);
18: }
19: }
20: }
21: }
2) 彩色截圖：
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: // 創建hBitmap
17: IntPtr hBitmap = NativeMethods.CreateCompatibleBitmap(hRenderDC, nWidth, nHeight);
18: // 創建MEM DC
19: IntPtr hMemDC = NativeMethods.CreateCompatibleDC(hRenderDC);
20: // 將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圖片|*.jpg|PNG圖片|*.png";
31: sfd.AddExtension = true;
32: sfd.CheckPathExists = true;
33: sfd.Title = "保存Google Earth截圖";
34:
35: if (sfd.ShowDialog() == DialogResult.OK)
36: {
37: ImageFormat imgFormat = null;
38: // 默認選擇JPG
39: if (sfd.FilterIndex == 0)
40: {
41: imgFormat = ImageFormat.Jpeg;
42: }
43: // 選擇PNG
44: else
45: {
46: imgFormat = ImageFormat.Png;
47: }
48: bmp.Save(sfd.FileName, imgFormat);
49: }
50: }
51:
52: //銷毀資源
53: NativeMethods.DeleteDC(hRenderDC);
54: NativeMethods.DeleteDC(hMemDC);
55: }
56: }
