获取文件的图标
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;namespace 获取文件的图标{ public partial class Form1 : Form { struct SHFILEINFO { public IntPtr hIcon; public int iIcon; public uint dwAttributes; public string szDisplayName; public string szTypeName; } public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { using (Graphics g = this.pictureBox1.CreateGraphics()) { g.Clear(this.pictureBox1.BackColor); //清除picturebox的背景色，为了画透明图标 g.DrawIcon(GetIcon(this.textBox1.Text, false), 1, 1); //绘制小图标 } using (Graphics g = this.pictureBox2.CreateGraphics()) { g.Clear(this.pictureBox2.BackColor); //清除picturebox的背景色，为了画透明图标 g.DrawIcon(GetIcon(textBox1.Text, true), 1, 1); //绘制小图标 } } /// /// 获取文件类型的关联图标 /// /// 文件类型的扩展名或文件的绝对路径 /// 是否返回大图标 /// 获取到的图标 static Icon GetIcon(string fileName, bool isLargeIcon) { SHFILEINFO shfi = new SHFILEINFO(); IntPtr hI; if (isLargeIcon) hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_LARGEICON); else hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_SMALLICON); Icon icon = Icon.FromHandle(shfi.hIcon).Clone() as Icon; NativeMethods.DestroyIcon(shfi.hIcon); //释放资源 return icon; } private void button2_Click(object sender, EventArgs e) { if (openFileDialog1 .ShowDialog ()==DialogResult .OK ) { textBox1.Text = openFileDialog1.FileName; } } class NativeMethods { public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags); public static extern int DestroyIcon(IntPtr hIcon); #region API 参数的常量定义 public const uint SHGFI_ICON = 0x100; public const uint SHGFI_LARGEICON = 0x0; //大图标 32×32 public const uint SHGFI_SMALLICON = 0x1; //小图标 16×16 public const uint SHGFI_USEFILEATTRIBUTES = 0x10; #endregion } }}
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