//QML2 code
import QtQuick 2.3
import com.duoduo.component 1.0
    QtQuick2QREncode{
        id:qr
        width: 128
        height: 128
        qrSize: Qt.size(width,width)
        anchors.centerIn: parent
        qrData:"duoduozhijiao" //encode contents
        qrForeground: "#29aee1" //encode color
        qrBackground: "white"
        qrMargin: 2
        qrMode: QtQuick1QREncode.MODE_8    //encode model
		qrLevel: QtQuick1QREncode.LEVEL_Q // encode level
        qrLogo: "qrc:/256.png" //or local path or qrc path but not network url
        onQrSaveFileChanged: {
            console.log("We get save file path is :"+qrfilepath)
        }
    }

//qml1 Code:
import QtQuick 1.0 //notice here
import com.ddui.qmlcomponents 1.0

Item {
    width: 256
    height: width
    visible: true
    QtQuick1QREncode{
           id:qr
           anchors.fill: parent
           qrSize: Qt.size(width,width)
           qrData:"www.heilqt.com" //encode contents
           qrForeground: "#29aee1" //encode color
           qrBackground: "white"
           qrMargin: 4
           qrMode: QtQuick1QREncode.MODE_8    //encode model
           qrLevel: QtQuick1QREncode.LEVEL_Q // encode level
           qrLogo: "qrc:/Apple.png" //or local path or qrc path but not network url
           onQrSaveFileChanged: {
               console.log("We get save file path is :"+qrfilepath)
           }
           onQrSizeChanged:{
               console.log("Size get save file path is :"+qrsize.width)
           }
       }
    onWidthChanged: {
        if(width>height){
            qr.setQrSize(Qt.size(height,height))
        }else{
            qr.setQrSize(Qt.size(width,width))
        }
    }
}

//this is a widgets Code
#include <QApplication>
#include "dduiqrwidgets.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    DDuiQRWidgets w;
    w.resize(400,100);
    w.show();
    w.setQrSaveFile("xxx.png");
    return app.exec();
}

make clean(mingw32-make clean)
qmake
make （mingw32-make mingw) | nmake(vc)
sudo make install (*unix)

  var duoduozhijiao = {
    nickName  : "寒山-居士",
    site : "http://www.heilqt.com",
    blog : "http://blog.heilqt.com"
  }