封装：Windows系统文件图标

2021-01-23 13:15

阅读：755

标签：dllimport ptr summary end iter region span ESS class

原文:封装：Windows系统文件图标

用途：用于获取文件系统默认图标





using System;




using System.Collections.Generic;




using System.Drawing;




using System.IO;




using System.Linq;




using System.Runtime.InteropServices;




using System.Text;



 




namespace HebianGu.ComLibModule.API




{



 



    ///  获取文件关联图标 




    public partial class IconHelper




    {



        ///  返回系统设置的图标   




        /// 文件路径 如果为""  返回文件夹的  




        /// 0  




        /// 结构体  




        /// 结构体大小  




        /// 枚举类型  




        /// -1失败  




        [DllImport("shell32.dll")]



        public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);



 



        ///  获取文件图标   




        public Icon GetFileIcon(string p_Path)




        {



            SHFILEINFO _SHFILEINFO = new SHFILEINFO();



            IntPtr _IconIntPtr = SHGetFileInfo(p_Path, 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON | SHGFI.SHGFI_USEFILEATTRIBUTES));



            if (_IconIntPtr.Equals(IntPtr.Zero)) return null;



            Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);



            return _Icon;



        }



 



        ///  获取文件夹图标   




        public Icon GetDirectoryIcon()




        {



            SHFILEINFO _SHFILEINFO = new SHFILEINFO();



            IntPtr _IconIntPtr = SHGetFileInfo(@"", 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON));



            if (_IconIntPtr.Equals(IntPtr.Zero)) return null;



            Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);



            return _Icon;



        }



 



        ///  获取系统图标   




        public Icon GetSystemInfoIcon(string p_Path)




        {



            if (Path.HasExtension(p_Path))



            {



                try




                {



                    return Icon.ExtractAssociatedIcon(p_Path);



                }



                catch




                {



                    return null;



                }



          



            }



            else




            {



                return this.GetDirectoryIcon();



            }



        }



 



    }



 



    partial class IconHelper




    {



        #region - Start 单例模式 -




 



        ///  单例模式 




        private static IconHelper t = null;



 



        ///  多线程锁 




        private static object localLock = new object();



 



        ///  创建指定对象的单例实例 




        public static IconHelper Instance



        {



            get




            {



                if (t == null)



                {



                    lock (localLock)



                    {



                        if (t == null)



                            return t = new IconHelper();



                    }



                }



                return t;



            }



        }



        ///  禁止外部实例 




        private IconHelper()




        {



 



        }



        #endregion - 单例模式 End -




 



    }



 



    [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;



    }



 



 



    public enum SHGFI



    {



        SHGFI_ICON = 0x100,



        SHGFI_LARGEICON = 0x0,



        SHGFI_USEFILEATTRIBUTES = 0x10




    }



}

应用示例：




        ///  图片路径 




        public Icon ImagePath



        {



            get { return IconHelper.Instance.GetSystemInfoIcon(FilePath); }



        }