public static IconFile LoadFromFile(string filename)
{
var instance = new IconFile();
var bytes = File.ReadAllBytes(filename);
var pinnedBytes = GCHandle.Alloc(bytes, GCHandleType.Pinned);
instance.IconDir = Marshal.PtrToStructure <ICONDIR>(pinnedBytes.AddrOfPinnedObject());
instance.IconEntry = new ICONDIRENTRY[instance.IconDir.idCount];
instance.IconImage = new byte[instance.IconDir.idCount][];
var offset = Marshal.SizeOf <ICONDIR>();
var icondirentrySize = Marshal.SizeOf <ICONDIRENTRY>();
for (int i = 0; i < instance.IconDir.idCount; i++)
{
var entry = Marshal.PtrToStructure <ICONDIRENTRY>(new IntPtr(pinnedBytes.AddrOfPinnedObject().ToInt64() + offset));
instance.IconEntry[i] = entry;
instance.IconImage[i] = new byte[entry.dwBytesInRes];
Buffer.BlockCopy(bytes, (int)entry.dwImageOffset, instance.IconImage[i], 0, (int)entry.dwBytesInRes);
offset += icondirentrySize;
}
pinnedBytes.Free();
return(instance);
}
private static void SetIcon(string pe, string ico)
{
var icon = IconFile.LoadFromFile(ico);
Console.WriteLine($"Loaded icon with {icon.GetImageCount()} image(s).");
var handle = BeginUpdateResource(pe, false);
if (handle == IntPtr.Zero)
{
Console.WriteLine("Error: could not begin update: " + Marshal.GetLastWin32Error());
return;
}
var iconData = icon.CreateIconGroupData(ICON_BASE_ID);
foreach (var lang in IconGroupLanguages)
{
Console.WriteLine($"Updating for language {lang}...");
bool res;
if (IconGroupName != null)
{
res = UpdateResource(handle, new IntPtr((int)ResourceType.RT_GROUP_ICON), IconGroupName, lang, iconData, (uint)iconData.Length);
}
else
{
if (IconGroupId == IntPtr.Zero)
{
IconGroupId = new IntPtr(1);
}
res = UpdateResource(handle, new IntPtr((int)ResourceType.RT_GROUP_ICON), IconGroupId, lang, iconData, (uint)iconData.Length);
}
if (!res)
{
Console.Write("Warning: could not update group icon: " + Marshal.GetLastWin32Error());
}
for (int i = 0; i < icon.GetImageCount(); i++)
{
var image = icon.GetImageData(i);
res = UpdateResource(handle, new IntPtr((int)ResourceType.RT_ICON), new IntPtr(ICON_BASE_ID + i), lang, image, (uint)image.Length);
if (!res)
{
Console.Write($"Warning: could not update image {i}: {Marshal.GetLastWin32Error()}");
}
}
}
EndUpdateResource(handle, false);
Console.WriteLine("Done.");
}