using System;

 using System.Runtime.InteropServices;

 using System.Windows.Forms;

 namespace HoverTreeWinForm

 {

 public partial class FormHewenqi : Form

 {

 /// <summary>

 /// 使窗体透明 by 何问起

 /// </summary>

 protected override CreateParams CreateParams

 {

 get

 {

 CreateParams parameter = base.CreateParams;

 parameter.ExStyle |= 0x00080000;

 return parameter;

 }

 }

 /// <summary>

 /// http://hovertree.com/h/bjaf/v4y0b2l6.htm

 /// </summary>

 /// <returns></returns>

 [DllImport("User32.dll")]

 public static extern int MessageBox(int h, string m, string c, int type);

 public FormHewenqi()

 {

 InitializeComponent();

 //使控件不透明

 this.TransparencyKey = BackColor;

 }

 private void button_hewenqi_Click(object sender, EventArgs e)

 {

 MessageBox(, "Hello Win32 API HoverTree", "何问起网", );

 }

 private void linkLabel_help_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)

 {

 System.Diagnostics.Process.Start("http://hovertree.com/h/bjaf/v4y0b2l6.htm");

 }

 private void button_hoverc_Click(object sender, EventArgs e)

 {

 //获取主窗体句柄

 IntPtr h_handle = HewenqiUser32.GetCurrentWindowHandle();

 int h_jubing = ; ;

 if (h_handle != IntPtr.Zero)

 h_jubing = (int)(h_handle);

 MessageBox(h_jubing, "Hello hovertree.com", "欢迎光临何问起", );

 }

 }

 }