Envoyer des informations de C++ vers QML
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"
http://www.youtube.com/watch?v=Fr5FuGhTqm8
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.
