/// <summary>
/// Get the icon for a hWnd
/// </summary>
/// <typeparam name="TIcon">The return type for the icon, can be Icon, Bitmap or BitmapSource</typeparam>
/// <param name="window">IInteropWindow</param>
/// <param name="useLargeIcons">true to try to get a big icon first</param>
/// <returns>TIcon</returns>
public static TIcon GetIconFromWindow <TIcon>(this IInteropWindow window, bool useLargeIcons = false) where TIcon : class
{
var iconSmall = IntPtr.Zero;
var iconBig = new IntPtr(1);
var iconSmall2 = new IntPtr(2);
IntPtr iconHandle;
if (useLargeIcons)
{
iconHandle = User32Api.SendMessage(window.Handle, WindowsMessages.WM_GETICON, iconBig, IntPtr.Zero);
if (iconHandle == IntPtr.Zero)
{
iconHandle = User32Api.GetClassLongWrapper(window.Handle, ClassLongIndex.IconHandle);
}
}
else
{
iconHandle = User32Api.SendMessage(window.Handle, WindowsMessages.WM_GETICON, iconSmall2, IntPtr.Zero);
}
if (iconHandle == IntPtr.Zero)
{
iconHandle = User32Api.SendMessage(window.Handle, WindowsMessages.WM_GETICON, iconSmall, IntPtr.Zero);
}
if (iconHandle == IntPtr.Zero)
{
iconHandle = User32Api.GetClassLongWrapper(window.Handle, ClassLongIndex.SmallIconHandle);
}
if (iconHandle == IntPtr.Zero)
{
iconHandle = User32Api.SendMessage(window.Handle, WindowsMessages.WM_GETICON, iconBig, IntPtr.Zero);
}
if (iconHandle == IntPtr.Zero)
{
iconHandle = User32Api.GetClassLongWrapper(window.Handle, ClassLongIndex.IconHandle);
}
if (iconHandle != IntPtr.Zero)
{
return(IconHelper.IconHandleTo <TIcon>(iconHandle));
}
// Nothing found
return(default(TIcon));
}
