I see. I thought the new syntax could replace the old one. It seems that I was wrong. (BTW, it is gcc to compile. My words about qmake compile was wrong.)
Thank you for your quick reply! Cheng Liang Nanjing, China http://www.devbean.info From: [email protected] To: [email protected] Date: Tue, 4 Sep 2012 07:22:55 +0200 Subject: Re: [Interest] A problem about signals/slots in Qt 5 On terça-feira, 4 de setembro de 2012 05.14.17, 程梁 wrote: > Hi, there! I try to connect signals and slot in Qt 5 using new syntax. But I > have a question: how to connect overloaded signals to special slots? It's not a simple syntax: > For example, I have the following code: > > QSpinBox *spinBox = new QSpinBox(&window); > QSlider *slider = new QSlider(Qt::Horizontal, &window); > > QObject::connect(slider, &QSlider::valueChanged, spinBox, > &QSpinBox::setValue); > QObject::connect(spinBox, &QSpinBox::valueChanged, > slider, &QSlider::setValue); > > valueChanged() in QSpinBox is an overloaded signal. When I use qmake 2.01a > to compile it, the error shows: Note: qmake doesn't compile. It is a Makefile generator. You're using GCC to compile. > no matching function for call to 'QObject::connect(QSpinBox*&, > <unresolved overloaded function type>, QSlider*&, void > (QAbstractSlider::*)(int))' > How could I solve this? > > In Qt 4 I could specialize the signal using SIGNAL(valueChanged(int)), how > could I do in Qt 5? Option 1: use the Qt 4 syntax. It's still valid. Option 2: void (QSpinBox:: *signal)(int) = &QSpinBox::valueChanged; QObject::connect(spinBox, signal, slider, &QSlider::setValue); -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center Intel Sweden AB - Registration Number: 556189-6027 Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden _______________________________________________ Interest mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/interest
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