def content=(new_content)
      content_ptr = ::FFI::MemoryPointer.new(new_content.bytesize)
      content_ptr.write_bytes(new_content)
      ffi_delegate.reset(content_ptr, content_ptr.size)
      # NOTE: FFI::MemoryPointer will autorelease
    end
def content=(new_content)
      content_ptr = ::FFI::MemoryPointer.new(new_content.bytesize)
      content_ptr.write_bytes(new_content)
      ffi_delegate.reset(content_ptr, content_ptr.size)
      # NOTE: FFI::MemoryPointer will autorelease
    end
Sets new content of this {Frame}.
 @param new_content [String]
 @return [new_content]