QEventLoop:Cannotbe used withoutQApplication QObject::connect:Cannotconnect(null)::aboutToQuit()to QNativeWifiEngine::closeHandle() QObject::connect:Cannotconnect(null)::aboutToQuit()toQNativeWifiEngine::closeHandle() QObject:Cannotcreate childrenfora parent that is in a different thread. (Parent...
QEventLoop:Cannotbe used withoutQApplication QObject::connect:Cannotconnect(null)::aboutToQuit()to QNativeWifiEngine::closeHandle() QObject::connect:Cannotconnect(null)::aboutToQuit()toQNativeWifiEngine::closeHandle() QObject:Cannotcreate childrenfora parent that is in a different thread. (Parent...
qWarning("QObject::connect: Cannot connect %s::%s to %s::%s", sender ? sender->metaObject()->className() : "(null)", (signal && *signal) ? signal+1 : "(null)", receiver ? receiver->metaObject()->className() : "(null)", (method && *method) ? method+1 : "(null)"); retur...
Every time I debug the code, it never gets to my onResult slot. I also get this error, which may be relevant. QObject::connect: Cannot connect (null)::aboutToQuit() to QNativeWifiEngine::closeHandle() c++ json qt http Share
qWarning("QObject::connect: Cannot connect %s::%s to %s::%s", sender ? sender->metaObject()->className() : "(null)", signal.methodSignature().constData(), receiver ? receiver->metaObject()->className() : "(null)", method.methodSignature().constData() ); ...
connect(pbasicmode,SIGNAL(dataChanged(const QModelIndex &,const QModelIndex &)),widget_1,SLOT(draw_again(const QModelIndex &,const QModelIndex &)));编译没有错,运行时没有反应,调试结束有下面的提示:QObject::connect: Cannot connect (null)::dataChanged(const QModelIndex &,const QModelIndex &) to wid...
qWarning("QObject::connect: Cannot connect %s::%s to %s::%s", sender ? sender->metaObject()->className() : "(null)", (signal && *signal) ? signal+1 : "(null)", receiver ? receiver->metaObject()->className() : "(null)", ...
qWarning("QObject::connect: Cannot connect %s::%s to %s::%s", sender ? sender->metaObject()->className() : "(null)", signal.methodSignature().constData(), receiver ? receiver->metaObject()->className() : "(null)", method.methodSignature().constData() ); ...
1.static bool connect(const QObject *sender, const char *signal, 2. const QObject *receiver, const char *member, Qt::ConnectionType = 3. #ifdef qdoc ...
程序产生事件有两种方式, 一种是调用QApplication::postEvent(), 例如QWidget::update()函数,当需要重新绘制屏幕时,程序调用update()函数,new出来一个paintEvent,调用 QApplication::postEvent(),将其放入Qt的消息队列中,等待依次被处理;另一种方式是调用sendEvent()函数,事件不会放入队列, 而是直接被派发和处理, ...