생짜

QString k = "CRAZYYYQT";

char ab[16];

sprintf(ab,"%s",(const char *)((QByteArray)(k.toLatin1()).data()) );

sprintf(ab,"%s",(const char *)((QByteArray)(k.toStdString()).data()));  

sprintf(ab,"%s",(const char *)k.toStdString().c_str()  );

 strcpy( ab, k.toStdString().c_str()); 

QString k = "CRAZYYYQT";

const char* p = k.toStdString().c_str();

char* cha = "ABC";

QString str = QString(ch);

QString str2 = QString("%1").arg(ch);

QString str3 = QString::fromUtf8(ch); 

      LIBS += -L$$PWD/../app_build/x86_64/ -ltest

INCLUDEPATH += $$PWD/../app_build/x86_64

DEPENDPATH += $$PWD/../app_build/x86_64

import QtQuick 2.0

Item {

    id: roundMouseArea

    property alias mouseX: mouseArea.mouseX

    property alias mouseY: mouseArea.mouseY

    property bool containsMouse: {

        var x1 = width / 2;

        var y1 = height / 2;

        var x2 = mouseX;

        var y2 = mouseY;

        var distanceFromCenter = Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2);

        var radiusSquared = Math.pow(Math.min(width, height) / 2, 2);

        var isWithinOurRadius = distanceFromCenter < radiusSquared;

        return isWithinOurRadius;

    }

    readonly property bool pressed: containsMouse && mouseArea.pressed

    signal clicked

    MouseArea {

        id: mouseArea

        anchors.fill: parent

        hoverEnabled: true

        acceptedButtons: Qt.LeftButton | Qt.RightButton

        onClicked: if (roundMouseArea.containsMouse) roundMouseArea.clicked()

    }

}

 import QtQuick 2.6

import QtQuick.Window 2.2

Window {

    visible: true

    width: 640; height: 480;

   title: qsTr("Hello World")

   MainForm {

        anchors.fill: parent

        mouseArea.onClicked: {

            console.log(qsTr('Clicked on background. Text: "' + textEdit.text + '"'))

        }

    }

    Rectangle {

        id: circleBt

        x: 50; y:50; width: 100; height: 100

        color: roundMouseArea.pressed ?

                  "red" : (roundMouseArea.containsMouse ? "darkorange" : "transparent")

        radius: width/2

        border.color: "darkorange"

        RoundMouseArea {

            id: roundMouseArea

            anchors.fill: parent

            onClicked: print("clicked")

        }

    }

}