C#基于google earth的二次开发

首先在C#中新建windows 应用程序。然后再form1中新建panel控件。命名为pnlEarth。

然后双击form1，进入form1.cs.

1、以下是代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using EARTHLib;
using System.Runtime.InteropServices;
using HookAPI;
using System.Threading;

namespace MYGPS3
{
public partial class Form1 : Form
{

private IntPtr _GEHrender;
private IntPtr _GEParentHrender;
private IntPtr _GEMainHandler;
private IApplicationGE _googleEarth;
private System.Windows.Forms.Control _parentControl;

IntPtr mapPtr;
IntPtr mainPtr;

public Form1()
{
InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)
{
SetGEHandlerToControl(pnlEarth, _googleEarth);

}

/// <summary>
/// 将GE的地图控件挂载到指定的控件中去
/// </summary>
/// <param name="parentControl">c#控件</param>
/// <param name="geApplication">ge应用程序</param>
public void SetGEHandlerToControl(System.Windows.Forms.Control parentControl, IApplicationGE geApplication)
{
this._parentControl = parentControl;
this._googleEarth = geApplication;
_googleEarth = new ApplicationGEClass();
//获取GE的主窗体句柄
this._GEMainHandler = (IntPtr)this._googleEarth.GetMainHwnd();
//将GE主窗体的高宽设置为0，隐藏掉GE主窗体
NativeMethods.SetWindowPos(this._GEMainHandler, NativeMethods.HWND_BOTTOM, 0, 0, 0, 0, NativeMethods.SWP_NOSIZE + NativeMethods.SWP_HIDEWINDOW);

//获取GE地图控件句柄
this._GEHrender = (IntPtr)_googleEarth.GetRenderHwnd();
//获取GE地图控件的父窗体句柄
this._GEParentHrender = NativeMethods.GetParent(this._GEHrender);
//将GE地图控件的父窗体设置为不可见
//（考虑到GE地图控件可能被其他程序截获，加上这一句以应万全）
NativeMethods.PostMessage((int)this._GEParentHrender, NativeMethods.WM_HIDE, 0, 0);

//设置GE地图控件的父窗体句柄为winform上的控件
NativeMethods.SetParent(this._GEHrender, parentControl.Handle);
}

public void ResizeGEControl()
{
if (this._parentControl != null)
{
//设置GE地图控件的大小等于父窗体大小
NativeMethods.MoveWindow(this._GEHrender, 0, 0, this._parentControl.Width, this._parentControl.Height, true);
}
}

/// <summary>
/// 释放GE句柄
/// </summary>
public void RealseGEHandler()
{
try
{
if (this._parentControl != null)
{
//将GE地图控件的句柄还原到GE主窗体上去
NativeMethods.SetParent(this._GEHrender, this._GEParentHrender);
//关闭GE主程序
NativeMethods.PostMessage(this._googleEarth.GetMainHwnd(), NativeMethods.WM_QUIT, 0, 0);
}
}
finally
{
//为防本程序的进程不能成功退出而导致GE出现问题，强制杀掉本程序的进程
System.Diagnostics.Process geProcess = System.Diagnostics.Process.GetCurrentProcess();
geProcess.Kill();
}
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
RealseGEHandler();
}

private void pnlEarth_SizeChanged(object sender, EventArgs e)
{
ResizeGEControl();
}

}
}

2、然后新建类，进入类向导，命名为NativeMethods.cs

添加以下代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;

namespace MYGPS3
{
class NativeMethods
{
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, UInt32 uflags);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr PostMessage(int hWnd, int msg, int wParam, int lParam);
public delegate int EnumWindowsProc(IntPtr hwnd, int lParam);

[DllImport("user32", CharSet = CharSet.Auto)]
public extern static IntPtr GetParent(IntPtr hWnd);

[DllImport("user32", CharSet = CharSet.Auto)]
public extern static bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

[DllImport("user32", CharSet = CharSet.Auto)]
public extern static IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

[DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
public static extern IntPtr GetWindow(IntPtr hWnd, int uCmd);

[DllImport("user32")]
public static extern IntPtr WindowFromPoint(Point point);//根据鼠标指针所在位置，得到窗口句柄

#region 预定义

public static readonly IntPtr HWND_BOTTOM = new IntPtr(1);
public static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);
public static readonly IntPtr HWND_TOP = new IntPtr(0);
public static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
public static readonly UInt32 SWP_NOSIZE = 1;
public static readonly UInt32 SWP_NOMOVE = 2;
public static readonly UInt32 SWP_NOZORDER = 4;
public static readonly UInt32 SWP_NOREDRAW = 8;
public static readonly UInt32 SWP_NOACTIVATE = 16;
public static readonly UInt32 SWP_FRAMECHANGED = 32;
public static readonly UInt32 SWP_SHOWWINDOW = 64;
public static readonly UInt32 SWP_HIDEWINDOW = 128;
public static readonly UInt32 SWP_NOCOPYBITS = 256;
public static readonly UInt32 SWP_NOOWNERZORDER = 512;
public static readonly UInt32 SWP_NOSENDCHANGING = 1024;

#endregion

public static int GW_CHILD = 5;
public static int GW_HWNDNEXT = 2;
public static readonly Int32 WM_QUIT = 0x0012;
public static readonly Int32 WM_HIDE = 0x0;

}
}

3、添加google earthapi接口

在菜单栏中选择项目->添加引用->COM，然后选择Google Earth 1.0 Type Library.

之后生成即可实现将google earth内嵌到panel控件中，进行二次开发。