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【CSharp】获取文件图标，返回Icon

作者:天楚 / 发布于2015/10/8/ 687


	class FileIcon
	 {
	 [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;
	 }

	 /// <summary>
	 /// 返回系统设置的图标
	 /// </summary>
	 /// <param name="pszPath">文件路径 如果为"" 返回文件夹的</param>
	 /// <param name="dwFileAttributes">0</param>
	 /// <param name="psfi">结构体</param>
	 /// <param name="cbSizeFileInfo">结构体大小</param>
	 /// <param name="uFlags">枚举类型</param>
	 /// <returns>-1失败</returns>
	 [DllImport("shell32.dll")]
	 public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);

	 public enum SHGFI
	 {
	 SHGFI_ICON = 0x100,
	 SHGFI_USEFILEATTRIBUTES = 0x10,
	 SHGFI_DISPLAYNAME = 0x200, // Gets the Display name
	 SHGFI_TYPENAME = 0x400, // Gets the type name
	 SHGFI_LARGEICON = 0x0, // Large icon
	 SHGFI_SMALLICON = 0x1 // Small icon
	 }

	 /// <summary>
	 /// 获取文件图标
	 /// </summary>
	 /// <param name="p_Path">文件全路径</param>
	 /// <returns>图标</returns>
	 public static 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;
	 }
	 /// <summary>
	 /// 获取文件夹图标
	 /// </summary>
	 /// <returns>图标</returns>
	 public static 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;
	 }

	 }

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