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using System;
using System.Drawing; // Icon;
using System.IO; // File;
using System.Runtime.InteropServices; // StructLayout; LayoutKind;
// ----------------------------------------------------------------------
namespace MIS
{
    public static class TShellIcon
    {
        [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 static class Win32
        {
            public const uint SHGFI_ICON = 0x100;
            public const uint SHGFI_LARGEICON = 0x0; // 'Large icon'
            public const uint SHGFI_SMALLICON = 0x1; // 'Small icon'
            // ----------------------------------------------------------------------
            [DllImport("shell32.dll")]
            public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
        }
        // ----------------------------------------------------------------------

        public static Icon GetSmallIcon(string fileName)
        {
            Icon ic = null;
            IntPtr hImgSmall; //the handle to the system image list
            // ----
            try
            {
                SHFILEINFO shinfo = new SHFILEINFO();
                //Use this to get the small Icon;
                hImgSmall = Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_SMALLICON);
                //The icon is returned in the hIcon member of the shinfo struct;
                ic = Icon.FromHandle(shinfo.hIcon);
            }
            catch (Exception) { ic = null; }
            // ----
            return ic;
        }
        // ----------------------------------------------------------------------

        public static Icon GetLargeIcon(string fileName)
        {
            Icon ic = null;
            IntPtr hImgLarge; //the handle to the system image list;
            // ----
            try
            {
                SHFILEINFO shinfo = new SHFILEINFO();
                //Use this to get the large Icon;
                hImgLarge = Win32.SHGetFileInfo(fileName, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON);
                //The icon is returned in the hIcon member of the shinfo struct;
                ic = Icon.FromHandle(shinfo.hIcon);
            }
            catch (Exception) { ic = null; }
            // ----
            return ic;
        }
        // ----------------------------------------------------------------------

    }
}