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using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.IO;
namespace Vestris.ResourceLib
{
/// <summary>
/// This structure depicts the organization of data in a .ico file.
/// </summary>
public class IconFile
{
/// <summary>
/// Resource type.
/// </summary>
public enum GroupType
{
/// <summary>
/// Icon.
/// </summary>
Icon = 1,
/// <summary>
/// Cursor.
/// </summary>
Cursor = 2
}
Kernel32.FILEGRPICONDIR _header = new Kernel32.FILEGRPICONDIR();
List<IconFileIcon> _icons = new List<IconFileIcon>();
/// <summary>
/// Type of the group icon resource.
/// </summary>
public GroupType Type
{
get
{
return (GroupType)_header.wType;
}
set
{
_header.wType = (byte)value;
}
}
/// <summary>
/// Collection of icons in an .ico file.
/// </summary>
public List<IconFileIcon> Icons
{
get
{
return _icons;
}
set
{
_icons = value;
}
}
/// <summary>
/// An existing .ico file.
/// </summary>
/// <param name="filename">An existing icon (.ico) file.</param>
public IconFile(string filename)
{
LoadFrom(filename);
}
/// <summary>
/// Load from a .ico file.
/// </summary>
/// <param name="filename">An existing icon (.ico) file.</param>
public void LoadFrom(string filename)
{
byte[] data = File.ReadAllBytes(filename);
IntPtr lpData = Marshal.AllocHGlobal(data.Length);
try
{
Marshal.Copy(data, 0, lpData, data.Length);
Read(lpData);
}
finally
{
Marshal.FreeHGlobal(lpData);
}
}
/// <summary>
/// Read icons.
/// </summary>
/// <param name="lpData">Pointer to the beginning of a FILEGRPICONDIR structure.</param>
/// <returns>Pointer to the end of a FILEGRPICONDIR structure.</returns>
internal IntPtr Read(IntPtr lpData)
{
_icons.Clear();
_header = (Kernel32.FILEGRPICONDIR)Marshal.PtrToStructure(
lpData, typeof(Kernel32.FILEGRPICONDIR));
IntPtr lpEntry = new IntPtr(lpData.ToInt32() + Marshal.SizeOf(_header));
for (int i = 0; i < _header.wCount; i++)
{
IconFileIcon iconFileIcon = new IconFileIcon();
lpEntry = iconFileIcon.Read(lpEntry, lpData);
_icons.Add(iconFileIcon);
}
return lpEntry;
}
}
}
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Daniel Doubrovkine has been in software engineering for twelve years and is currently development manager at Application Security Inc. in New York City. He has been involved in many software ventures, including Xo3 and Vestris Inc, was a development lead at Microsoft Corp. in Redmond, and director of Engineering at Visible Path Corp. in New York City. Daniel also builds and runs a foodie website, http://www.foodcandy.com.