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：http://earth.google.com/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:         /// <summary>

  20:         /// 用来关闭GoogleEarth的消息定义

  21:         /// </summary>

  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:         /// <summary>

  28:         /// 定义GE应用程序类

  29:         /// </summary>

  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：