Реализация класса для смены иконок.

Код:


[CODE]
public class IconChanger
{
#region Structure
[SuppressUnmanagedCodeSecurity()]
private class NativeMethods
{
[DllImport("kernel32")]
public static extern IntPtr BeginUpdateResource(string fileName, [MarshalAs(UnmanagedType.Bool)]
bool deleteExistingResources);
[DllImport("kernel32")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool UpdateResource(IntPtr hUpdate, IntPtr type, IntPtr name, short language, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 5)]
byte[] data, int dataSize);
[DllImport("kernel32")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool EndUpdateResource(IntPtr hUpdate, [MarshalAs(UnmanagedType.Bool)]
bool discard);
}
[StructLayout(LayoutKind.Sequential)]
private struct ICONDIR
{
public ushort Reserved;
public ushort Type;
public ushort Count;
}
[StructLayout(LayoutKind.Sequential)]
private struct ICONDIRENTRY
{
public byte Width;
public byte Height;
public byte ColorCount;
public byte Reserved;
public ushort Planes;
public ushort BitCount;
public int BytesInRes;
public int ImageOffset;
}
[StructLayout(LayoutKind.Sequential)]
private struct BITMAPINFOHEADER
{
public uint Size;
public int Width;
public int Height;
public ushort Planes;
public ushort BitCount;
public uint Compression;
public uint SizeImage;
public int XPelsPerMeter;
public int YPelsPerMeter;
public uint ClrUsed;
public uint ClrImportant;
}
[StructLayout(LayoutKind.Sequential, Pack = 2)]
private struct GRPICONDIRENTRY
{
public byte Width;
public byte Height;
public byte ColorCount;
public byte Reserved;
public ushort Planes;
public ushort BitCount;
public int BytesInRes;
public ushort ID;
}
#endregion

public void InjectIcon(string exeFileName, string iconFileName, bool backUp = true)
{
File.Copy(exeFileName, exeFileName + ".backup");
InjectIcon(exeFileName, iconFileName, 1, 1);
}

public void InjectIcon(string exeFileName, string iconFileName, uint iconGroupID, uint iconBaseID)
{
const uint RT_ICON = 3u;
const uint RT_GROUP_ICON = 14u;
IconFile iconFile = new IconFile().FromFile(iconFileName);
var hUpdate = NativeMethods.BeginUpdateResource(exeFileName, false);
var data = iconFile.CreateIconGroupData(iconBaseID);
NativeMethods.UpdateResource(hUpdate, new IntPtr(RT_GROUP_ICON), new IntPtr(iconGroupID), 0, data, data.Length);
for (int i = 0; i