QML2与C++混合编程

最近有Qter找我问下关于QML和C++混合编程的问题，问我qmlc++是如何交互的，我总结了三点：

//1.第一种C++与QML交互的方法//C++部分：//这个方法在主类里面int main(int argc, char *argv[]){    QApplication a(argc, argv);    NdooWebView ndooView(0);    ndooView.resize(978,686);    ndooView.show();    int i= a.exec();    ProjectManagerApi::getInstance()->stopRun();    return i;}//这个方法在主类NdooWebView里面void Widget::showMainQML(){         QDeclarativeView* noticeViewUi = new QDeclarativeView(0);        noticeViewUi->setResizeMode(QDeclarativeView::SizeRootObjectToView);        //noticeViewUi->setWindowModality(Qt::ApplicationModal);        noticeViewUi->setWindowFlags(Qt::FramelessWindowHint|Qt::Dialog|Qt::WindowStaysOnTopHint);        noticeViewUi->setAttribute(Qt::WA_TranslucentBackground);        noticeViewUi->setStyleSheet("background:transparent;");        noticeViewUi->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);        noticeViewUi->setSource(QUrl("qrc:/qml/main.qml"));        QGraphicsObject* noticeViewObj = noticeViewUi->rootObject();        connect(noticeViewObj,SIGNAL(signalMainMoveMent(int,QVariant)),this,SLOT(slotMovenoticeViewer(int,QVariant)));//signalMainMoveMent是qml里面的信号，slotMovenoticeViewer是本地的槽QMetaObject::invokeMethod(noticeViewUi->rootObject(),"ndooNoticeJsonString",                              Q_ARG(QVariant,QVariant::fromValue(str)));//这个是C++可以把str值传到qml的ndooNoticeJsonString方法里面 str可以作为ndooNoticeJsonString的参数}//qml部分：import QtQuick 1.1Rectangle {    id: name    width: 280; height: 180    signal signalMainMoveMent(int cmd,variant lst);//可以连接c++中的那个信号槽    property variant lstData: []    property int totalNum: 1    property int currentNum: 1    property int curPage: 1//这个控件触发一个信号到它的parent    InoticeViewTopQml{        id:top        anchors.left: parent.left        anchors.right: parent.right        anchors.top: parent.top        onSignalItemMoveMent: {            signalMainMoveMent(cmd,lst);        }    }    ListModel{        id:notiModel    }ListView{id:lstView}//就是C++里面的注册的方法function ndooNoticeJsonString(str){var tmp = str;//做你想做的一些事情}}======================================================>>>>>>>>>>>>>>>>>>>>>>>>>>>>>//2.第2种C++与QML交互的方法//C++部分//定义一个接口类：datainterface"datainterface.h"class DataInterface : public QObject{    Q_OBJECT    Q_PROPERTY(QString strError READ getError WRITE setError)public:    explicit DataInterface(QObject *parent = 0);    QString getError(){ return strError;}    void setError(const QString& error){strError = error;}signals:    void signalResponseDataReady(bool error,int cmd,QStringList finalData);    void signalNotifyUI(bool error,int cmd,QStringList notifyData);public slots:    void slotRequestData(int cmd,QStringList parameterList);    void slotResponseNotifyUI(bool error,int cmd,QStringList processResult);    //qml notify widget to close    //process widget singal    void slotPcsamResponseDataReady(bool error,int cmd,QStringList finalData);    void slotPcsamNotifyUI(bool error,int cmd,QStringList notifyData);    void creatConnection();    void slotdownloadOpenFile();private:    QString strError;    bool isConnected;};"datainterface.cpp"#endif // DATAINTERFACE_H#include "datainterface.h"DataInterface::DataInterface(QObject *parent) :    QObject(parent),isConnected(false){      creatConnection();}void DataInterface::slotRequestData(int cmd, QStringList parameterList){//Widget为主类,以下类似    Widget::instance()->requestData(cmd,parameterList);    //PCSAM::instance()->slotRequestData(cmd);}void DataInterface::slotResponseNotifyUI(bool error, int cmd, QStringList processResult){    Widget::instance()->responseNotifyUI(error,cmd,processResult);}//====================process pcsam signal======================================void DataInterface::slotPcsamNotifyUI(bool error,int cmd, QStringList processResult){     emit signalNotifyUI(error,cmd,processResult);}void DataInterface::slotPcsamResponseDataReady(bool error, int cmd, QStringList finalData){    emit signalResponseDataReady(error,cmd,finalData);}//=======================creat connection in first request(connection depdent instance)==========================void DataInterface::creatConnection(){      connect(Widget::instance(),SIGNAL(signalNotifyUI(bool,int,QStringList)),this,SLOT(slotPcsamNotifyUI(bool,int,QStringList)));      connect(Widget::instance(),SIGNAL(signalResponseDataReady(bool,int,QStringList)),this,SLOT(slotPcsamResponseDataReady(bool,int,QStringList)));}//QML部分:import MyDataPool 1.1//这个为main里面注册的接口类import com.nokia.extras 1.1//*Item{//cmd为信号的第一个参数指代哪个命令DataPool{        id:dataPool        onSignalNotifyUI:{            if(!error){                                switch(cmd){                case WIFI_GET_MODEL:{                    console.log("--------ddddd----"+ notifyData);                    if(notifyData[1]=="unknown")                    {                        dlg.currentDevice = "Android Device"                        return;                    }                    dlg.currentDevice = notifyData[1]                }break;}}}onSignalResponseDataReady: {            switch(cmd)            {            case TRADE_MS_REQUEST_MAINUI:            {                //cmd为信号的第一个参数指代哪个命令                if(finalData[0] == "1")                {                   //connectingTips                }                else if(finalData[0] == "2")                {                }            }break;            }        }}}#include "dataInterface.h"#include <QtDeclarative>int main(int argc, char *argv[]){    QApplication a(argc, argv);qmlRegisterType<DataInterface>("MyDataPool",1,1,"DataPool");//main注册接口类    int i= a.exec();    ProjectManagerApi::getInstance()->stopRun();    return i;}//具体使用情况多参考QML与C++交互文档

细看见文档:QML与C++交互实例

另外添加以下官方的说明QML2 C++