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QMetaType::unregisterType为什么不能取消注册？

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Code animal

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QMetaType::unregisterType为什么不能取消注册？
我尝试使用QMetaType::unregisterType将自定义的QObject全部取消注册,但是全部返回的false。
取消注册的原因是我重新加载了dll,想将先前注册的类型全部取消注册,然后再把新的dll里面的类型注册进去。
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