static void OverrideWrite(GLib.GType gtype, WriteNativeDelegate callback)
 {
     unsafe {
         IntPtr *raw_ptr = (IntPtr *)(((long)gtype.GetClassPtr()) + (long)class_abi.GetFieldOffset("write"));
         *raw_ptr = Marshal.GetFunctionPointerForDelegate((Delegate)callback);
     }
 }
        private int InternalWrite(IntPtr data, uint length)
        {
            WriteNativeDelegate unmanaged = null;

            unsafe {
                IntPtr *raw_ptr = (IntPtr *)(((long)this.LookupGType().GetThresholdType().GetClassPtr()) + (long)class_abi.GetFieldOffset("write"));
                unmanaged = (WriteNativeDelegate)Marshal.GetDelegateForFunctionPointer(*raw_ptr, typeof(WriteNativeDelegate));
            }
            if (unmanaged == null)
            {
                return(0);
            }

            int __result = unmanaged(this.Handle, data, length);

            return(__result);
        }