Icon Extraction : Icon Image « 2D Graphics « C# / C Sharp

1. C# / C Sharp
2. 2D Graphics
3. Icon Image

Icon Extraction

        
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;

namespace AjGenesisStudio.Utils
{
    class IconExtraction
    {
        public static int GetIcon(ImageList images, string extension)
        {
            return GetIcon(images, extension, false);
        }

        public static int GetIcon(ImageList images, string extension, bool largeIcon)
        {
            for (int i = 0; i < images.Images.Count; i++)
                if (images.Images.Keys[i] == extension)
                    return i;
            images.Images.Add(extension, ExtractIconForExtension(extension, largeIcon));
            return images.Images.Count - 1;
        }

        public static Icon ExtractIconForExtension(string extension, bool large)
        {
            if (extension != null)
            {
                //let's just make up a file name with that extension
                string fictitiousFile = "0" + extension;
                //now get the icon for that file
                return GetAssociatedIcon(fictitiousFile, large);
            }
            else
            {
                throw new ArgumentException("Invalid file or extension.", "fileOrExtension");
            }
        }

        public static Icon GetAssociatedIcon(string stubPath, bool large)
        {
            SHFILEINFO info = new SHFILEINFO(true);
            int cbFileInfo = Marshal.SizeOf(info);
            SHGFI flags;

            if (large)
                flags = SHGFI.Icon | SHGFI.LargeIcon | SHGFI.UseFileAttributes;
            else
                flags = SHGFI.Icon | SHGFI.SmallIcon | SHGFI.UseFileAttributes;


            SHGetFileInfo(stubPath, 256, out info, (uint)cbFileInfo, flags);
            return (Icon)Icon.FromHandle(info.hIcon);
        }

        #region Win32 API imports

        [DllImport("shell32.dll", CharSet = CharSet.Auto)]
        private static extern int SHGetFileInfo(
            string pszPath,
            int dwFileAttributes,
            out    SHFILEINFO psfi,
            uint cbfileInfo,
            SHGFI uFlags);

        private const int MAX_PATH = 260;
        private const int MAX_TYPE = 80;

        private struct SHFILEINFO
        {
            public SHFILEINFO(bool b)
            {
                hIcon = IntPtr.Zero;
                iIcon = 0;
                dwAttributes = 0;
                szDisplayName = "";
                szTypeName = "";
            }


            public IntPtr hIcon;
            public int iIcon;
            public uint dwAttributes;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
            public string szDisplayName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_TYPE)]
            public string szTypeName;
        };

        [Flags]
        enum SHGFI : int
        {
            /// <summary>get icon</summary>
            Icon = 0x000000100,

            /// <summary>get display name</summary>
            DisplayName = 0x000000200,

            /// <summary>get type name</summary>
            TypeName = 0x000000400,

            /// <summary>get attributes</summary>
            Attributes = 0x000000800,

            /// <summary>get icon location</summary>
            IconLocation = 0x000001000,

            /// <summary>return exe type</summary>
            ExeType = 0x000002000,

            /// <summary>get system icon index</summary>
            SysIconIndex = 0x000004000,

            /// <summary>put a link overlay on icon</summary>
            LinkOverlay = 0x000008000,

            /// <summary>show icon in selected state</summary>
            Selected = 0x000010000,

            /// <summary>get only specified attributes</summary>
            Attr_Specified = 0x000020000,

            /// <summary>get large icon</summary>
            LargeIcon = 0x000000000,

            /// <summary>get small icon</summary>
            SmallIcon = 0x000000001,

            /// <summary>get open icon</summary>
            OpenIcon = 0x000000002,

            /// <summary>get shell size icon</summary>
            ShellIconize = 0x000000004,

            /// <summary>pszPath is a pidl</summary>
            PIDL = 0x000000008,

            /// <summary>use passed dwFileAttribute</summary>
            UseFileAttributes = 0x000000010,

            /// <summary>apply the appropriate overlays</summary>
            AddOverlays = 0x000000020,

            /// <summary>Get the index of the overlay in the upper 8 bits of the iIcon</summary>
            OverlayIndex = 0x000000040,
        }

        #endregion
    }
}

   
    
    
    
    
    
    
    
  

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