C# 获取系统Icon、获取文件相关的Icon

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace FileExplorer { /// <summary> /// 系统Icon /// 1、Get() 获取指定索引对应的系统icon /// 2、Save() 保存所有系统图像 /// 3、Show() 显示所有系统Icon图像 /// </summary> public partial class SystemIcon : Form { public SystemIcon() { InitializeComponent(); Show(this); Save(); } /// <summary> /// 在form上显示所有系统icon图像 /// </summary> public static void Show(Form form) { LoadSystemIcon(); FlowLayoutPanel flowLayout = new FlowLayoutPanel(); flowLayout.Dock = System.Windows.Forms.DockStyle.Fill; flowLayout.AutoScroll = true; for (int i = 0; i < SystemIconList.Count; i++) { PictureBox pic = new PictureBox(); pic.Size = new System.Drawing.Size(32, 32); flowLayout.Controls.Add(pic); Bitmap p = SystemIconList[i].ToBitmap(); pic.Image = p; } form.Controls.Add(flowLayout); } /// <summary> /// 保存所有系统图像 /// </summary> public static void Save() { LoadSystemIcon(); for (int i = 0; i < SystemIconList.Count; i++) { Bitmap p = SystemIconList[i].ToBitmap(); // 保存图像 string path = AppDomain.CurrentDomain.BaseDirectory + "系统图标\\"; string filepath = path + (i + ".png"); if (!Directory.Exists(path)) Directory.CreateDirectory(path); if (!File.Exists(filepath)) p.Save(filepath); } } /// <summary> /// 获取指定索引对应的系统icon /// </summary> public static Icon Get(int index) { LoadSystemIcon(); return index < SystemIconList.Count ? SystemIconList[index] : null; } private static List<Icon> SystemIconList = new List<Icon>(); // 记录系统图标 //[DllImport("user32.dll", CharSet = CharSet.Auto)] //private static extern bool MessageBeep(uint type); [DllImport("Shell32.dll")] public extern static int ExtractIconEx(string libName, int iconIndex, IntPtr[] largeIcon, IntPtr[] smallIcon, int nIcons); private static IntPtr[] largeIcon; private static IntPtr[] smallIcon; /// <summary> /// 获取所有系统icon图像 /// </summary> private static void LoadSystemIcon() { if (SystemIconList.Count > 0) return; largeIcon = new IntPtr[1000]; smallIcon = new IntPtr[1000]; ExtractIconEx("shell32.dll", 0, largeIcon, smallIcon, 1000); SystemIconList.Clear(); for (int i = 0; i < largeIcon.Length; i++) { try { Icon ic = Icon.FromHandle(largeIcon[i]); SystemIconList.Add(ic); } catch (Exception ex) { break; } } } //private void LoadSystemIcon() //{ // largeIcon = new IntPtr[1000]; // smallIcon = new IntPtr[1000]; // ExtractIconEx("shell32.dll", 0, largeIcon, smallIcon, 1000); // FlowLayoutPanel flowLayout = new FlowLayoutPanel(); // flowLayout.Dock = System.Windows.Forms.DockStyle.Fill; // flowLayout.AutoScroll = true; // for (int i = 0; i < largeIcon.Length; i++) // { // try // { // PictureBox pic = new PictureBox(); // pic.Size = new System.Drawing.Size(32, 32); // flowLayout.Controls.Add(pic); // Icon ic = Icon.FromHandle(largeIcon[i]); // SystemIcon.Add(ic); // Bitmap p = ic.ToBitmap(); // pic.Image = p; // // 保存图像 // string path = AppDomain.CurrentDomain.BaseDirectory + "系统图标\\"; // string filepath = path + (i + ".png"); // if (!Directory.Exists(path)) Directory.CreateDirectory(path); // if (!File.Exists(filepath)) p.Save(filepath); // } // catch (Exception ex) // { // break; // } // } // this.Controls.Add(flowLayout); //} } } 

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.Windows.Forms; using System.IO; using System.Drawing; using Microsoft.Win32; namespace FileExplorer { /// <summary> /// 获取指定文件的Icon图像getIcon()、getIcon2() /// </summary> class FileIcon { private const uint SHGFI_ICON = 0x100; private const uint SHGFI_LARGEICON = 0x0; //大图标 private const uint SHGFI_SMALLICON = 0x1; //小图标 [StructLayout(LayoutKind.Sequential)] public struct SHFILEINFO { public IntPtr hIcon; //文件的图标句柄 public IntPtr iIcon; //图标的系统索引号 public uint dwAttributes; //文件的属性值 [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string szDisplayName;//文件的显示名 [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szTypeName; //文件的类型名 }; [DllImport("shell32.dll")] private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags); /// <summary> /// 获取文件FilePath对应的Icon /// </summary> public static Icon getIcon(string FilePath) { SHFILEINFO shinfo = new SHFILEINFO(); //FileInfo info = new FileInfo(FileName); //大图标 SHGetFileInfo(FilePath, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_LARGEICON); Icon largeIcon = Icon.FromHandle(shinfo.hIcon); //Icon.ExtractAssociatedIcon(FileName); return largeIcon; } /// <summary> /// 获取文件FilePath对应的Icon /// </summary> public static Icon getIcon2(string FilePath) { return Icon.ExtractAssociatedIcon(FilePath); } } }