winForm下,做类似资源管理器一样的工具,怎么取到文件类型的相应图标

在winForm下编程时,做资源管理器浏览本地文件的时候,用ListView控件加载文件,
可以根据文件类型来判断item的图标,具体代码如下:

  1using System;
  2using System.Drawing;
  3using System.Windows.Forms;
  4
  5namespace YJDSoft.Control.Data.LocalDataExplorer
  6{
  7    /**//// <summary>
  8    /// ImageIconManage 的摘要说明。
  9    /// </summary>
 10    public class ImageIconManage
 11    {
 12        private System.Windows.Forms.ImageList   m_SmallImageList;
 13        private System.Windows.Forms.ImageList   m_LargeImageList;
 14        //private System.IntPtr  m_FormHandle;
 15        private int IconIndex = 0 ;
 16        /**//// <summary>
 17        /// 图表管理类
 18        /// </summary>
 19        /// <param name="SmallImageList">小图标集合的list</param>
 20        /// <param name="LargeImageList">大图标集合的list</param>
 21        public ImageIconManage(System.Windows.Forms.ImageList SmallImageList,System.Windows.Forms.ImageList LargeImageList)
 22        {
 23            //
 24            // TODO: 在此处添加构造函数逻辑
 25            //
 26            m_SmallImageList = SmallImageList;
 27            m_LargeImageList = LargeImageList;
 28            //m_FormHandle = FormHandle;
 29            m_LargeImageList.ImageSize = new Size(32,32);
 30
 31            this.m_LargeImageList.Images.Clear();
 32            this.m_SmallImageList.Images.Clear();
 33            Icon ic0=myExtractIcon("%SystemRoot%\\system32\\shell32.dll",3);
 34            m_LargeImageList.Images.Add(ic0);
 35            m_SmallImageList.Images.Add(ic0);
 36        }
 37        /**//// <summary>
 38        /// 得到该文件对应的图标(包括大图标，小图标)
 39        /// </summary>
 40        /// <param name="FileNameOrExtension">文件的全路径或者文件的带点扩展名（如: .Dll)</param>
 41        /// <returns>返回该文件或扩展名的图标在SmallImageList或LargeImageList里的索引值</returns>
 42        public int FileBindingIcon(string FileNameOrExtension)
 43        {
 44            try
 45            {
 46                SetIcon(m_SmallImageList,FileNameOrExtension,false);//得到小图标平铺
 47                SetIcon(m_LargeImageList,FileNameOrExtension,true);//得到大图标平铺
 48                return IconIndex = IconIndex + 1;
 49            }
 50            catch(Exception ex)
 51            {
 52                MessageBox.Show(ex.Message,"错误提示",0,MessageBoxIcon.Error);
 53                return -1;
 54            }
 55        }
 56        /**//// <summary>
 57        /// 得的目录的图标的索引值
 58        /// </summary>
 59        public int GetFolderIcon
 60        {
 61            get
 62            {
 63                return 0;        //目录图标的索引值默认为0
 64            }
 65        }
 66
 67        用API函数调用取的文件对应的图标的所有方法#region    用API函数调用取的文件对应的图标的所有方法
 68        //*********************************************************************************************************//
 69        [System.Runtime.InteropServices.DllImport("Shell32.dll")] 
 70        public static extern int ExtractIcon(IntPtr h,string strx,int ii);
 71
 72        [System.Runtime.InteropServices.DllImport("Shell32.dll")] 
 73        public static extern int SHGetFileInfo(string pszPath,uint dwFileAttributes,ref SHFILEINFO psfi,uint cbFileInfo, uint uFlags);
 74
 75        public struct SHFILEINFO
 76        { 
 77            public IntPtr hIcon;  
 78            public int   iIcon;  
 79            public uint dwAttributes;
 80            public char szDisplayName; 
 81            public char szTypeName; 
 82        }
 83        
 84        protected virtual void SetIcon(ImageList imageList,string FileName,bool tf)
 85        {
 86            SHFILEINFO fi=new SHFILEINFO();
 87            if(tf==true)
 88            {//得到大图标平铺
 89                int iTotal=(int)SHGetFileInfo(FileName,0,ref fi,100,  16640);//SHGFI_ICON|SHGFI_SMALLICON
 90                try
 91                {
 92                    if(iTotal >0)
 93                    {
 94                        Icon ic=Icon.FromHandle(fi.hIcon);
 95                        imageList.Images.Add(ic);
 96                        //return ic;
 97                    }
 98                }
 99                catch(Exception ex)
100                { MessageBox.Show(ex.Message,"错误提示",0,MessageBoxIcon.Error);} 
101            }
102            else
103            {//得到小图标平铺
104                int iTotal=(int)SHGetFileInfo(FileName,0,ref fi,100,  257);
105                try
106                {
107                    if(iTotal >0)
108                    {
109                        Icon ic=Icon.FromHandle(fi.hIcon);
110                        imageList.Images.Add(ic);
111                        //return ic;
112                    }
113                }
114                catch(Exception ex)
115                { MessageBox.Show(ex.Message,"错误提示",0,MessageBoxIcon.Error);} 
116            }
117        }
118        //*********************************************************************************************************//
119        //************************************************************************************* 
120 
121        protected virtual Icon myExtractIcon(string FileName,int iIndex)
122        {
123            try
124            {
125                //IntPtr hIcon=(IntPtr)ExtractIcon(this.m_FormHandle,FileName,iIndex);
126                IntPtr hIcon=(IntPtr)ExtractIcon(this.m_SmallImageList.Handle,FileName,iIndex);
127                if(! hIcon.Equals(null))
128                {
129                    Icon icon=Icon.FromHandle(hIcon);
130                    return icon;
131                }
132            }
133            catch(Exception ex)
134            { MessageBox.Show(ex.Message,"错误提示",0,MessageBoxIcon.Error);} 
135            return null;
136        }
137        //*************************************************************************************
138        #endregion
139
140    }
141}
142