QObject::connect: Cannot queue arguments of type 'string'
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信号槽传递非Qt库类型参数时，出现QObject::connect: Cannot queue arguments of type 'string'(Make sure 'string' is regi...
例如以C++标准库中string做参数，则会出现：
QObject::connect: Cannot queue arguments of type 'string'
(Make sure 'string' is registed using qRegisterMetaType().)
解决方案：
可以再main中加入：
qRegisterMetaType<string>("string");注册该类型
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