Bonjour,

Je m' entraine sur quelques exemples qml sous gnu/linux
Je n ai pas rencontré trop de problemes dans mes exercices precedents, par contre je bute sur celui de "dialcontrol"



Je voulais remplacer le slider par le monitoring du cpu load mais impossible d' y parvenir, le dialcontrol reste inactif.

" ReferenceError: Can't find variable: loadcpu"

cpuload.h
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#ifndef CPULOAD_H
#define CPULOAD_H
#include <QList>
#include <QByteArray>
#include <QObject>
 
class CPULoad : public QObject
 
{
    Q_OBJECT
 
public:
    explicit CPULoad(QObject *parent = 0);
 
    void init();
 
    void update();
 
    Q_INVOKABLE int  cpuLoad() const;
 
private:
 
    typedef QList<QByteArray> TimeList;
 
    CPULoad(const CPULoad &);
 
    CPULoad & operator= (const CPULoad &);
 
    TimeList  readTimeList();
 
private:
 
    TimeList   m_timeList;
 
    int        m_load;
 
    static int m_forcedLoad;
 
};
 
#endif // CPULOAD_H

cpuload.cpp

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#include "cpuload.h"
#include <QFile>
#include <QDebug>
 
/*!
 
 * \class CPULoad
 
 * \brief CPULoad calculates the current CPU load.
 
 */
 
int CPULoad::m_forcedLoad = -1;
 
//! Constructor
 
CPULoad::CPULoad(QObject *parent) :
 
    m_load(-1)
 
{}
 
/*!
 
 * Reads /proc/stat file
 
 * ToDo: use sscanf if it faster
 
 */
 
CPULoad::TimeList CPULoad::readTimeList()
 
{
 
#ifdef Q_OS_LINUX
 
    QFile fin(QString("/proc/stat"));
 
    if (fin.open(QIODevice::ReadOnly | QIODevice::Text))
 
        return fin.readLine().split(' ');
 
#endif
 
    return TimeList();
 
}
 
/*!
 
 * Initialize. Currently only sets the value to -1.
 
 */
 
void CPULoad::init()
 
{
 
    m_load = -1;
 
}
 
/*!
 
 * Update the value.
 
 * This must be called periodically (e.g. 1 - 5 seconds) in order to update the measurement.
 
 * The data is obtained from first line of /proc/stat file
 
 */
 
void CPULoad::update()
 
{
 
    // Read timing from the file
 
    TimeList v(readTimeList());
 
    if (m_timeList.length()) {
 
        // Take delta with the previous timing
 
        int sum  = 0;
 
        int idle = 0;
 
        int iowait = 0;
 
        int cpu = 0;
 
        for (int i = 2; i < 7 && i < v.length(); i++)
 
            sum += v.at(i).toInt() - m_timeList.at(i).toInt();
 
        idle = v.at(5).toInt() - m_timeList.at(5).toInt();
 
        iowait = v.at(6).toInt() - m_timeList.at(6).toInt();
 
        cpu = sum - idle - iowait;
 
        // Calculate load
 
        m_load = 100.0 - (100.0 * idle / sum);
 
    } else {
 
        m_load = -1;
 
    }
 
    // Store the current timing
 
    m_timeList = v;
 
}
 
/*!
 
 * Returns The current value of the load in the range of 0 to 100
 
 * or -1 if nothing measured.
 
 */
 
int CPULoad::cpuLoad() const
 
{
 
    return m_forcedLoad > -1 ? m_forcedLoad : m_load;
 
}

main.cpp
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#include "cpuload.h"
 
Q_DECL_EXPORT int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));
 
    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/conkycloneqml/main.qml"));
    viewer.showExpanded();
 
    CPULoad execProcess;
    QDeclarativeView view;
    QDeclarativeContext *context = view.rootContext();
    context->setContextProperty("loadcpu", &execProcess);
 
    return app->exec();
}

main.qml (ligne 117-120)
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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
**     the names of its contributors may be used to endorse or promote
**     products derived from this software without specific prior written
**     permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
 
//! [imports]
import QtQuick 1.0
import Qt 4.7
import "content"
//! [imports]
 
//! [0]
Rectangle {
    color: "#545454"
    width: 300; height: 300
 
    // Dial with a slider to adjust it
    Dial {
        id: dial
        x: -42
        y: -42
        width: 210
        height: 210
        anchors.verticalCenterOffset: -87
        anchors.horizontalCenterOffset: -87
        scale: 0.600
        anchors.centerIn: parent
        value: slider.x * 100 / (container.width - 34)
 
    }
 
    Rectangle {
        id: container
        anchors { bottom: parent.bottom; left: parent.left
            right: parent.right; leftMargin: 20; rightMargin: 20
            bottomMargin: 10
        }
        height: 16
 
        radius: 8
        opacity: 0.7
        smooth: true
        gradient: Gradient {
            GradientStop { position: 0.0; color: "gray" }
            GradientStop { position: 1.0; color: "white" }
        }
 
        Rectangle {
            id: slider
            x: 1; y: 1; width: 30; height: 14
            radius: 6
            smooth: true
            gradient: Gradient {
                GradientStop { position: 0.0; color: "#424242" }
                GradientStop { position: 1.0; color: "black" }
            }
 
            MouseArea {
                anchors.fill: parent
                anchors.margins: -16 // Increase mouse area a lot outside the slider
                drag.target: parent; drag.axis: Drag.XAxis
                drag.minimumX: 2; drag.maximumX: container.width - 32
            }
        }
    }
    QuitButton {
        anchors.right: parent.right
        anchors.top: parent.top
        anchors.margins: 10
    }
 
    Dial {
        id: dial1
        x: 84
        y: -42
        width: 210
        height: 210
        anchors.verticalCenterOffset: -87
        anchors.horizontalCenterOffset: 39
        anchors.centerIn: parent
        //value: dial1.value = loadcpu.cpuLoad()
        scale: 0.600
        onValueChanged: {
            loadcpu.cpuLoad();
        }
    }
}
//! [0]

http://qt.gitorious.org/qtplayground...b01fe/src/core

Si vous aviez l' amabilitée de m' orienter sur la facon de proceder?
Merci d' avance.
Je debute et cela n' est pas evident pour moi.