C#操作系统文件 示例代码

获取系统文件icon图标 获取文件基本信息等等
using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.Drawing;namespace Core.IO{ /// <summary> /// 获取系统文件类信息 /// </summary> public class ShellIcon { [StructLayout(LayoutKind.Sequential)] public struct SHFILEINFO { public IntPtr hIcon; public IntPtr iIcon; public uint dwAttributes; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string szDisplayName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szTypeName; }; class Win32 { public const uint SHGFI_ICON = 0x000000100;// get icon public const uint SHGFI_DISPLAYNAME = 0x000000200;// get display name public const uint SHGFI_TYPENAME = 0x000000400;// get type name public const uint SHGFI_ATTRIBUTES = 0x000000800;// get attributes public const uint SHGFI_ICONLOCATION = 0x000001000;// get icon location public const uint SHGFI_EXETYPE = 0x000002000;// return exe type public const uint SHGFI_SYSICONINDEX = 0x000004000;// get system icon index public const uint SHGFI_LINKOVERLAY = 0x000008000;// put a link overlay on icon public const uint SHGFI_SELECTED = 0x000010000;// show icon in selected state public const uint SHGFI_ATTR_SPECIFIED = 0x000020000;// get only specified attributes public const uint SHGFI_LARGEICON = 0x000000000;// get large icon public const uint SHGFI_SMALLICON = 0x000000001;// get small icon public const uint SHGFI_OPENICON = 0x000000002;// get open icon public const uint SHGFI_SHELLICONSIZE = 0x000000004;// get shell size icon public const uint SHGFI_PIDL = 0x000000008;// pszPath is a pidl public const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;// use passed dwFileAttribute public const uint FILE_ATTRIBUTE_READONLY = 0x00000001; public const uint FILE_ATTRIBUTE_HIDDEN = 0x00000002; public const uint FILE_ATTRIBUTE_SYSTEM = 0x00000004; public const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010; public const uint FILE_ATTRIBUTE_ARCHIVE = 0x00000020; public const uint FILE_ATTRIBUTE_DEVICE = 0x00000040; public const uint FILE_ATTRIBUTE_NORMAL = 0x00000080; public const uint FILE_ATTRIBUTE_TEMPORARY = 0x00000100; public const uint FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200; public const uint FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400; public const uint FILE_ATTRIBUTE_COMPRESSED = 0x00000800; public const uint FILE_ATTRIBUTE_OFFLINE = 0x00001000; public const uint FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000; public const uint FILE_ATTRIBUTE_ENCRYPTED = 0x00004000; [DllImport("shell32.dll")] public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags); [DllImport("User32.dll")] public static extern int DestroyIcon(System.IntPtr hIcon); } public ShellIcon() { } /// <summary> /// 获取扩展名信息 /// </summary> /// <param name="ext"></param> /// <returns></returns> public static string GetTypeInfo(string ext) { SHFILEINFO shinfo = new SHFILEINFO(); Win32.SHGetFileInfo(ext, Win32.FILE_ATTRIBUTE_NORMAL, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_TYPENAME | Win32.SHGFI_USEFILEATTRIBUTES); return shinfo.szTypeName; } /// <summary> /// 获取扩展名的图标 /// </summary> /// <param name="ext"></param> /// <returns></returns> public static Icon GetSmallTypeIcon(string ext) { SHFILEINFO shinfo = new SHFILEINFO(); Win32.SHGetFileInfo(ext, Win32.FILE_ATTRIBUTE_NORMAL, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON | Win32.SHGFI_USEFILEATTRIBUTES); if (shinfo.hIcon.ToInt32() == 0) return null; Icon shellIcon = (Icon)System.Drawing.Icon.FromHandle(shinfo.hIcon).Clone(); Win32.DestroyIcon(shinfo.hIcon); return shellIcon; } /// <summary> /// 获取文件的小图标 /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static Icon GetSmallIcon(string fileName) { SHFILEINFO shinfo = new SHFILEINFO(); Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON); if (shinfo.hIcon.ToInt32() == 0) return null; Icon shellIcon = (Icon)System.Drawing.Icon.FromHandle(shinfo.hIcon).Clone(); Win32.DestroyIcon(shinfo.hIcon); return shellIcon; } /// <summary> /// 获取文件的大图标 /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static Icon GetLargeIcon(string fileName) { SHFILEINFO shinfo = new SHFILEINFO(); Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON); if (shinfo.hIcon.ToInt32() == 0) return null; Icon shellIcon = (Icon)System.Drawing.Icon.FromHandle(shinfo.hIcon).Clone(); Win32.DestroyIcon(shinfo.hIcon); return shellIcon; } }}