获得系统文件对应的图标代码,CSharp代码库,德仔网

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【CSharp】获得系统文件对应的图标
作者:Dezai.CN / 发布于2011/7/5/ 556
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<pre>
    
    #region DLLIMPORT
    // Retrieves information about an object in the file system,
    // such as a file, a folder, a directory, or a drive root.
    [DllImport("shell32",
      EntryPoint = "SHGetFileInfo",
      ExactSpelling = false,
      CharSet = CharSet.Auto,
      SetLastError = true)]
    private static extern IntPtr SHGetFileInfo(
     string pszPath,      //指定的文件名
     FILE_ATTRIBUTE dwFileAttributes, //文件属性
     ref SHFILEINFO sfi,     //返回获得的文件信息,是一个记录类型
     int cbFileInfo,      //文件的类型名
     SHGFI uFlags);
    #endregion

    #region STRUCTS
    // Contains information about a file object
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    private 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
    };
    #endregion
    #region Enums
    // Flags that specify the file information to retrieve with SHGetFileInfo
    [Flags]
    public enum SHGFI : uint
    {
        ADDOVERLAYS = 0x20,
        ATTR_SPECIFIED = 0x20000,
        ATTRIBUTES = 0x800,   //获得属性
        DISPLAYNAME = 0x200,  //获得显示名
        EXETYPE = 0x2000,
        ICON = 0x100,    //获得图标
        ICONLOCATION = 0x1000,
        LARGEICON = 0,    //获得大图标
        LINKOVERLAY = 0x8000,
        OPENICON = 2,
        OVERLAYINDEX = 0x40,
        PIDL = 8,
        SELECTED = 0x10000,
        SHELLICONSIZE = 4,
        SMALLICON = 1,    //获得小图标
        SYSICONINDEX = 0x4000,
        TYPENAME = 0x400,   //获得类型名
        USEFILEATTRIBUTES = 0x10
    }
    // Flags that specify the file information to retrieve with SHGetFileInfo
    [Flags]
    public enum FILE_ATTRIBUTE
    {
        READONLY = 0x00000001,
        HIDDEN = 0x00000002,
        SYSTEM = 0x00000004,
        DIRECTORY = 0x00000010,
        ARCHIVE = 0x00000020,
        DEVICE = 0x00000040,
        NORMAL = 0x00000080,
        TEMPORARY = 0x00000100,
        SPARSE_FILE = 0x00000200,
        REPARSE_POINT = 0x00000400,
        COMPRESSED = 0x00000800,
        OFFLINE = 0x00001000,
        NOT_CONTENT_INDEXED = 0x00002000,
        ENCRYPTED = 0x00004000
    }
    #endregion
    #region Variables
    //保存小图标列表
    private static System.Windows.Forms.ImageList smallImageList;


    private static List<string> FileExtList = new List<string>();
    static SystemFileIcon()
    {
        smallImageList = new System.Windows.Forms.ImageList();
         //将 ImageList中的图标设置为32位色图标，这样可以得到较好的显示效果
        smallImageList.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
        addForderIcon();
    }
    #endregion
    #region PrivateMethods
    /// <summary>
    /// 获取系统图标
    /// </summary>
    /// <param name="path">文件名</param>
    /// <param name="dwAttr">文件信息</param>
    /// <param name="dwFlag">获取信息控制字</param>
    /// <returns></returns>
    private static Icon GetIcon(string path, FILE_ATTRIBUTE dwAttr, SHGFI dwFlag)
    {
        SHFILEINFO fi = new SHFILEINFO();
        Icon ic = null;
        int iTotal = (int)SHGetFileInfo(path, dwAttr, ref fi, 0, dwFlag);
        ic = Icon.FromHandle(fi.hIcon);
        return ic;
    }
    /// <summary>
    /// 向smallInamgeList和largeImageList中
    /// 加入相应文件对应的图标
    /// </summary>
    /// <param name="fileName"></param>
    private static void addFileIcon(string fileName)
    {
        smallImageList.Images.Add(GetIcon(fileName,
         FILE_ATTRIBUTE.NORMAL,
         SHGFI.USEFILEATTRIBUTES | SHGFI.ICON | SHGFI.LARGEICON));
        
    }
    private static void addForderIcon()
    {
        smallImageList.Images.Add(GetIcon("dic",
         FILE_ATTRIBUTE.DIRECTORY,
         SHGFI.USEFILEATTRIBUTES | SHGFI.ICON | SHGFI.LARGEICON));
       
    }
    #endregion
    #region PublicMethods
    /// <summary>
    /// 获取系统的小图标列表
    /// </summary>
    public static System.Windows.Forms.ImageList SmallImageList
    {
        get
        {
            return smallImageList;
        }

    }
  
    /// <summary>
    /// 文件对应的图标在ImageList中的索引号
    /// （在SmallImageList,LargeImageList中的索引号是相同的）
    /// </summary>
    /// <param name="fileName">扩展名 如 .docx</param>
    /// <returns>索引号</returns>
    public static int ImageIndex(string fileName)
    {
        int index = 0;
        int extIndex = fileName.LastIndexOf('.');
        if (extIndex < 0)//没有扩展名的文件当作文件夹处理
        {
            extIndex = 2;
        }
        else//文件图标索引获取
        { 
                addFileIcon(fileName);//装载图标到ImageList中
                index = smallImageList.Images.Count - 1;
                 
        }
        return index;
    }
    #endregion
}
</pre>
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