C#调用GoogleEarthComAPI开发（二）

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原文地址：http://www.cnblogs.com/wpwen/archive/2009/02/22/1395622.html

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：

// 功能：GE实例(二)
// 描述：GE COM API 网址：http://earth.google.com/comapi/index.html
// 作者：温伟鹏
// 日期：2009-02-08
  
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using EARTHLib;
  
namespace GEDemo
{
    public partial class Form2 : Form
    {
        /// <summary>
        /// 用来关闭GoogleEarth的消息定义
        /// </summary>
        static readonly Int32 WM_QUIT = 0x0012; 
  
        private IntPtr GEHWnd = (IntPtr)5;
        private IntPtr GEHrender = (IntPtr)5;
        private IntPtr GEParentHrender = (IntPtr)5;
        /// <summary>
        /// 定义GE应用程序类
        /// </summary>
        private ApplicationGEClass GeApp;
  
        public Form2()
        {
            InitializeComponent();
        }
  
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
  
            if (!this.DesignMode)
            {
                GeApp = new ApplicationGEClass();
  
                GEHWnd = (IntPtr)GeApp.GetMainHwnd();
  
                NativeMethods.SetWindowPos(GEHWnd, NativeMethods.HWND_BOTTOM, 0, 0, 0, 0,
                    NativeMethods.SWP_NOSIZE + NativeMethods.SWP_HIDEWINDOW);
  
                GEHrender = (IntPtr)GeApp.GetRenderHwnd();
                GEParentHrender = (IntPtr)NativeMethods.GetParent(GEHrender);
  
                NativeMethods.MoveWindow(GEHrender, 0, 0, this.Width, this.Height, true);
  
                NativeMethods.SetParent(GEHrender, this.Handle);
            }
        }
  
        protected override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);
  
            NativeMethods.PostMessage(GeApp.GetMainHwnd(), WM_QUIT, 0, 0);
        }
    }
}

2、NativeMethods类定义：

// 功能：Windows API调用
// 描述：大家可以参照MSDN
// 作者：温伟鹏
// 日期：2009-02-08
  
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
  
namespace GEDemo
{
    public 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);
  
        #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 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);
  
        public static int GW_CHILD = 5;
        public static int GW_HWNDNEXT = 2;
    }
}