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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace MouseEventTrap
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(20, 9);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(492, 37);
			this.label1.TabIndex = 0;
			this.label1.Text = "本程序示范如何在C#/.NET中处理 WM_NCLBUTTONDOWN，看效果请用鼠标点击标题栏。";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(10, 56);
			this.textBox1.Multiline = true;
			this.textBox1.Name = "textBox1";
			this.textBox1.ReadOnly = true;
			this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.textBox1.Size = new System.Drawing.Size(512, 249);
			this.textBox1.TabIndex = 1;
			this.textBox1.Text = "";
			this.textBox1.TextChanged  = new System.EventHandler(this.textBox1_TextChanged);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(532, 315);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.textBox1,
																		  this.label1});
			this.Name = "Form1";
			this.Text = "MouseEventTrap";
			this.ResumeLayout(false);

			/*
			this.components = new System.ComponentModel.Container();
			this.Size = new System.Drawing.Size(300,300);
			this.Text = "Form1";
			*/
		}
		#endregion

		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;

		// Array index corresponds to winuser.h value. E.g., in winuser.h:
		// #define HTCLIENT 1
		// #define HTCAPTION 2
		// etc.
		//
		private String[] HITCODES = {
			"HTNOWHERE",
			"HTCLIENT",
			"HTCAPTION",
			"HTSYSMENU",
			"HTGROWBOX",
			"HTMENU",
			"HTHSCROLL",
			"HTVSCROLL",
			"HTMINBUTTON",
			"HTMAXBUTTON",
			"HTLEFT",
			"HTRIGHT",
			"HTTOP",
			"HTTOPLEFT",
			"HTTOPRIGHT",
			"HTBOTTOM",
			"HTBOTTOMLEFT",
			"HTBOTTOMRIGHT",
			"HTBORDER",
			"HTOBJECT",
			"HTCLOSE",
			"HTHELP"
		};

		// 重载虚拟 WndProc 以截获任何消息
		protected override void WndProc(ref Message m) 
		{
			// 该值来自 Windows SDK 文件 winuser.h
			const int WM_NCLBUTTONDOWN = 0x00A1;

			// 侦听操作系统消息
			switch (m.Msg) 
			{
				case WM_NCLBUTTONDOWN:
					Point p = new Point((int)m.LParam);
					String msg = String.Format(
						"WM_NCLBUTTONDOWN: p=({0},{1}), hitcode={2}\r\n",
						p.X, p.Y, HITCODES[(int)m.WParam]);
					this.textBox1.Text  = msg;
					break;                
			}
			base.WndProc(ref m); // 不要忘了调用基类成员函数!
		}


		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void textBox1_TextChanged(object sender, System.EventArgs e)
		{
		
		}


	}
}