C++要做的事情：

1.QML中注冊C++類型（qmlRegisterType）

2.獲取元對象樹，從中提取注冊的指針【這樣就和普通的對象一樣了】

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qml要做的事情：

1.import注冊的C++類型

2.使用onXXX進行qml與C++的交互

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通過Q_PROPERTY進行交互

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因為qml啟動開銷大，第一次是創造界面，然后在第二次，第三次等僅僅是隱藏，并沒有銷毀窗口；

程序運行截圖如下：

源碼如下：

test.h

#ifndef TEST_H #define TEST_H#include <QObject>class Test : public QObject {Q_OBJECT public:explicit Test(QObject *parent = 0);Q_PROPERTY(QString msg READ msg WRITE setMeg NOTIFY msgChanged)Q_PROPERTY(QString close READ close WRITE setClose NOTIFY closeChanged)QString msg();QString close();void setClose(QString close);void setMeg(QString msg); signals:void msgChanged();void aquireData(QString msg);void closeChanged();void hideQMLWindow();private:QString m_msg; };#endif // TEST_H

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widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> class QQmlApplicationEngine; class Test;namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void btnClicked();void getMes(QString msg);void closeQML();private:Ui::Widget *ui;QQmlApplicationEngine *m_engine;Test *m_test;bool m_windowShow;bool m_realLoad; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

test.cpp

#include "test.h" #include <QDebug>Test::Test(QObject *parent) : QObject(parent) {}QString Test::msg() {return ""; }QString Test::close() {}void Test::setClose(QString close) {Q_UNUSED(close)emit closeChanged();emit hideQMLWindow(); }void Test::setMeg(QString msg) {emit aquireData(msg); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include "test.h" #include <QDebug> #include <QQmlApplicationEngine> #include <QQuickView> #include <QList> #include <typeinfo>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_realLoad=false;m_windowShow=false;m_engine=new QQmlApplicationEngine;connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked())); }Widget::~Widget() {delete ui; }void Widget::btnClicked() {if(m_windowShow){return;}if(m_realLoad){qDebug()<<"開啟";m_test->setClose("開啟");return;}qmlRegisterType<Test>("Test",1,0,"Test");m_engine->load(QUrl(QLatin1String("qrc:/example.qml")));QList<QObject*> qmlList=m_engine->rootObjects();QObjectList list=qmlList[0]->children()[0]->children();for(int i=0;i<list.size();i++){if(QString(typeid(*list[i]).name()).contains("Test")){m_test=qobject_cast<Test*>(list[i]);connect(m_test,SIGNAL(aquireData(QString)),this,SLOT(getMes(QString)));connect(m_test,SIGNAL(deleteQMLWindow()),this,SLOT(closeQML()));m_windowShow=true;m_realLoad=true;break;}} }void Widget::getMes(QString msg) {QStringList list=msg.split(";");for(int i=0;i<list.size();i++){ui->plainTextEdit->insertPlainText(list[i]+"\n");}ui->plainTextEdit->insertPlainText("---------------------\n");m_windowShow=false; }void Widget::closeQML() {m_windowShow=false; }

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example.qml

import QtQuick 2.5 import QtQuick.Window 2.2 import Test 1.0 import QtQuick.Controls 1.4Window {id:windowvisible: truewidth: 240height: 100title: qsTr("QML數據發出窗口")onClosing: {test.close="close"window.hide()}Column{spacing:2Row{spacing:2Label{text:"姓名:"font.pixelSize: 22font.italic: true}TextEdit{id:namewidth:240font.pixelSize: 20}}Row{spacing:2Label{text:"性別:"font.pixelSize: 22font.italic: true}TextEdit{id:sexwidth:240font.pixelSize: 20}}Row{spacing:2Label{text:"年齡:"font.pixelSize: 22font.italic: true}TextEdit{id:agewidth:240font.pixelSize: 20}}Button{id:submitwidth:240text: qsTr("提交")onClicked:{test.msg="姓名："+name.text+";"+"性別："+sex.text+";"+"年齡："+age.textwindow.hide();}}Test{id:testonCloseChanged:{window.show()}}} }

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