form1.cs

150个经典的入门学习程序源代码

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

namespace Example031_提取并显示文件包含的图标
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		/// <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.button1 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(208, 192);
			this.button1.Name = "button1";
			this.button1.TabIndex = 0;
			this.button1.Text = "Open";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 229);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.button1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		[System.Runtime.InteropServices.DllImport("shell32.dll")]
		private static extern int ExtractIconEx(string lpszFile,int nIconIndex,ref IntPtr phiconLarge,ref IntPtr phiconSmall,int nIcons);
		[System.Runtime.InteropServices.DllImport("user32.dll")]
		private static extern int DrawIcon(IntPtr hdc, int x,int y,IntPtr hIcon);
		[System.Runtime.InteropServices.DllImport("user32")]
		private static extern IntPtr GetDC(IntPtr hwnd);

		private void button1_Click(object sender, System.EventArgs e)
		{
			if (this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				this.Refresh();
				IntPtr Large, Small;
				int i,nIcons;
				Large=(IntPtr)0;
				Small=(IntPtr)0;
				nIcons=ExtractIconEx(this.openFileDialog1.FileName,-1,ref Large,ref Small,1);
				for(i=0;i<nIcons;i++)
				{
					ExtractIconEx(this.openFileDialog1.FileName,i,ref Large,ref Small,1);
					DrawIcon(GetDC(this.Handle),(i/4)*40,(i%4)*40,Large);					
				}
			}
		}

	}
}