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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