Question

我有一个Matlab类，实现序列化和反序列化会很痛苦，而且不需要。因此，我按如下方式重载了saveobj：

    function sobj = saveobj(self)
         sojb = [];
         error(['atmlab:' mfilename ':nostoring'], ...
            ['You tried to store %s %s.  Loading is impossible, ' ...
             'therefore I refuse to store.  Sorry.'], ...
             class(self), self.name);
    end

不幸的是，当我测试这个时，Matlab会尝试提供帮助并将警告变成错误（由于某种原因两次）：

>> save('/tmp/test.mat', 'X')
Warning: While saving an object of class 'SatDataset':
You tried to store SatDataset amsua.  Loading is impossible, therefore I refuse to store.  Sorry.
(Type "warning off atmlab:SatDataset:nostoring" to suppress this warning.) 
Warning: While saving an object of class 'SatDataset':
You tried to store SatDataset amsua.  Loading is impossible, therefore I refuse to store.  Sorry.
(Type "warning off atmlab:SatDataset:nostoring" to suppress this warning.)

我可以使用undocumented feature

将警告变为错误

>> warning error atmlab:SatDataset:nostoring
>> save('/tmp/test.mat', 'X')
Error using save
While saving an object of class 'SatDataset':
You tried to store SatDataset amsua.  Loading is impossible, therefore I refuse to store.  Sorry.

Unexpected error status flag encountered.  Resetting to proper state.

但这并不令人满意，因为我不想依赖未记录的功能，我当然不想强迫用户这样做。

如何有效地抛出错误，阻止用户尝试从我的类中序列化对象？

根据要求，重现情况的最小例子：

% in TestClass.m
classdef TestClass < handle
    methods
        function sobj = saveobj(self)
            sojb = [];
            error('Unable to store %s objects', class(self));
        end
    end
end

% on the interactive prompt:

>> t = TestClass();

>> save('/tmp/fubar.mat', 't');
Warning: While saving an object of class 'TestClass':
Unable to store TestClass objects 
Warning: While saving an object of class 'TestClass':
Unable to store TestClass objects

Answer 1

就个人而言，我更喜欢将所有属性标记为Transient，并让对象有效地具有无效状态，这是保存/加载的结果。要防止MATLAB保存数据非常困难，而且您的解决方法可能会严重干扰用户的工作流程。

Answer 2

您的代码实际上会引发错误，您应该通过error()替换warning()的来电

防止序列化

2 个答案: