QT报错:error: static assertion failed: No Q_OBJECT in the class with the signal

本文详细介绍了在使用QT进行项目开发时遇到的信号与槽连接错误:'No Q_OBJECT in the class with the signal'。通过分析问题原因,发现是在发送信号的类中未使用Q_OBJECT宏导致。文章分享了解决方案,即在发送信号和接收信号的类头文件中添加Q_OBJECT宏,并重新构建项目。

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今天利用QT写一个项目,在写代码的过程中,使用到了QT中一大特色【信号和槽】,对这个也是刚刚学习阶段,所以在这里遇到了一个问题:

error: static assertion failed: No Q_OBJECT in the class with the
signal # define Q_STATIC_ASSERT_X(Condition, Message)
static_assert(bool(Condition), Message)

其实这个问题主要是说明没有使用Q_OBJECT

主界面(我使用QMainWindows)是有这个关键字的,所以我以为是我没有继承QObject的问题,后来查资料得知,QMainWindows是继承QObject的,所以问题不在主界面上了。然后又是去论坛官网找资料,终于找到问题了,原来是发送信号的类没有带上Q_OBJECT,在发送信号的类和接收信号的类的头文件中加上Q_OBJECT,然后重新构建。

C:\Users\48318\Desktop\Qt\2048\interface_44.cpp:35: error: static assertion failed: Signal and slot arguments are not compatible. In file included from C:\Qt\5.15.2\mingw81_64\include/QtGui/qtguiglobal.h:43, from C:\Qt\5.15.2\mingw81_64\include/QtWidgets/qtwidgetsglobal.h:43, from C:\Qt\5.15.2\mingw81_64\include\QtWidgets/qmainwindow.h:43, from C:\Qt\5.15.2\mingw81_64\include\QtWidgets/QMainWindow:1, from ..\2048\interface_44.h:4, from ..\2048\interface_44.cpp:1: C:\Qt\5.15.2\mingw81_64\include/QtCore/qobject.h: In instantiation of 'static QMetaObject::Connection QObject::connect(const typename QtPrivate::FunctionPointer<Func>::Object*, Func1, const typename QtPrivate::FunctionPointer<Func2>::Object*, Func2, Qt::ConnectionType) [with Func1 = void (QTimer::*)(QTimer::QPrivateSignal); Func2 = void (Interface_44::*)(QTimerEvent*); typename QtPrivate::FunctionPointer<Func>::Object = QTimer; typename QtPrivate::FunctionPointer<Func2>::Object = Interface_44]': ..\2048\interface_44.cpp:35:69: required from here C:\Qt\5.15.2\mingw81_64\include/QtCore/qglobal.h:121:63: error: static assertion failed: Signal and slot arguments are not compatible. # define Q_STATIC_ASSERT_X(Condition, Message) static_assert(bool(Condition), Message) ^~~~~~~~~~~~~~~ C:\Qt\5.15.2\mingw81_64\include/QtCore/qobject.h:255:9: note: in expansion of macro 'Q_STATIC_ASSERT_X' Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments, typename SlotType::Arguments>::value), ^~~~~~~~~~~~~~~~~
06-08
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