Qt信号槽中的信号传递对比

#include "MainView.h" MainView::MainView(QObject* parent):QObject(parent) { // Qt::ConnectionType ctype = Qt::DirectConnection; qRegisterMetaType<Copy>("Copy"); Qt::ConnectionType ctype = Qt::QueuedConnection; connect(this, SIGNAL(sendConstRef(Copy)), this, SLOT(receiveConstRef(Copy)), ctype); // connect(this, SIGNAL(sendValue(Copy)), // this, SLOT(receiveConstRef(Copy)), ctype); // connect(this, SIGNAL(sendConstRef(Copy)), // this, SLOT(receiveValue(Copy)), ctype); // connect(this, SIGNAL(sendValue(Copy)), // this, SLOT(receiveValue(Copy)), ctype); } void MainView::testSignaleSlot() { Copy c(1, "James"); //emit sendValue(c); emit sendConstRef(c); } void MainView::receiveValue(Copy c){ qDebug() << "receiveValue id: " << c.m_id; qDebug() << "receiveValue name: " << c.m_name; } void MainView::receiveConstRef(const Copy &c) { qDebug() << "receiveConstRef id: " << c.m_id; qDebug() << "receiveConstRef name: " << c.m_name; }