<![CDATA[Battery status Problem]]>I am trying to make a gui that has a few buttons that will give information for a handheld device. In this case a beagle board. I started the project using Qt widget Project/QT gui application.

One of the buttons has to show a "Battery Status Bar." I am working on that and am getting some errors. I could use some advice on how to resolve these. I will post the error messages followed by my code.

@In file included from ..\gui\main.cpp:2:
..\gui/mainwindow.h:9: error: expected constructor, destructor, or type conversion before 'namespace'
..\gui/mainwindow.h:25: error: 'Ui' has not been declared
..\gui/mainwindow.h:25: error: ISO C++ forbids declaration of 'MainWindow' with no type
..\gui/mainwindow.h:25: error: expected ';' before '*' token
mingw32-make.exe[1]: *** [debug/main.o] Error 1
mingw32-make.exe: *** [debug] Error 2
00:51:37: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project gui (target: Desktop)
When executing build step 'Make'@

Here is what I have for my code:

gui.pro:

@#-------------------------------------------------

Project created by QtCreator 2012-04-25T01:13:25

#-------------------------------------------------

QT += core gui

TARGET = gui
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h
qmobilityglobal.h

FORMS += mainwindow.ui

CONFIG += mobility
MOBILITY += systeminfo
@

mainwindow.h:

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSysInfo>

//QTM_USE_NAMESPACE

namespace Ui {
class MainWindow;
class ButtonClicked;
}
class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void ButtonClicked();

private:
Ui::MainWindow *ui;
void setupGeneral();

QSysInfo *deviceInfo;

};

#endif // MAINWINDOW_H@

main.cpp:

@#include <QtGui/QApplication>
#include "mainwindow.h"
#include "qmobilityglobal.h"

int main(int argc, char argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
/ DigitalClock clock;
clock.show();
*/
return a.exec();
}@

mainwindow.cpp:

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "qmobilityglobal.h"
#include <QtGui>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
//deviceInfo(NULL)
{
ui->setupUi(this);
setupGeneral();
ui->batteryLevelBar->hide();
}

// Press Button to see Battery Status Bar
void MainWindow::ButtonClicked() {
if (ui->batteryLevelBar->isVisible())
ui->batteryLevelBar->setVisible(false);
else
ui->batteryLevelBar->setVisible(true);
}

// Get Battery Info
void MainWindow::setupGeneral()
{
deviceInfo = new QSysInfo(this);
ui->batteryLevelBar->setValue(deviceInfo->batteryLevel());
connect(deviceInfo, SIGNAL(batteryLevelChanged(int)),
ui->batteryLevelBar, SLOT(setValue(int)));
}

MainWindow::~MainWindow()
{
delete ui;
}@

I do not know enough about C++ to figure this one out. Appreciate the help.

]]>https://forum.qt.io/topic/16211/battery-status-problemRSS for NodeTue, 22 Sep 2026 18:14:00 GMTThu, 26 Apr 2012 07:06:24 GMT60<![CDATA[Reply to Battery status Problem on Fri, 27 Apr 2012 06:38:27 GMT]]>Hi,

your compile error showed up in the mainwindow.h file, so I removed all things that were not related to that :-)

]]>https://forum.qt.io/post/137185https://forum.qt.io/post/137185Fri, 27 Apr 2012 06:38:27 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 16:07:19 GMT]]>yes, but doesnt that basically get rid of what I want to do with the progress bar and battery status? I think I should be using QSystemDeviceInfo instead of QSysInfo, but I cant seem to find that file. When I add a QML file with the following:

@import QtMobility.systeminfo 1.2@

But then I get the folowing error message:

@In file included from ..\gui\main.cpp:2:
..\gui/mainwindow.h:32: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\gui/mainwindow.h:32: error: expected ';' before '*' token
mingw32-make.exe[1]: *** [debug/main.o] Error 1
mingw32-make.exe: *** [debug] Error 2
09:55:18: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project gui (target: Desktop)
When executing build step 'Make'@

]]>https://forum.qt.io/post/137109https://forum.qt.io/post/137109Thu, 26 Apr 2012 16:07:19 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 11:29:33 GMT]]>Hi,

no, just the content of the method:

@
#include "mainwindow.h"
#include "ui_mainwindow.h"
// #include "qmobilityglobal.h"
#include <QtGui>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
//deviceInfo(NULL)
{
ui->setupUi(this);
setupGeneral();
// ui->batteryLevelBar->hide();
}

// Press Button to see Battery Status Bar
void MainWindow::ButtonClicked() {
// if (ui->batteryLevelBar->isVisible())
// ui->batteryLevelBar->setVisible(false);
// else
// ui->batteryLevelBar->setVisible(true);
}

// Get Battery Info
void MainWindow::setupGeneral()
{
// deviceInfo = new QSysInfo(this);
// ui->batteryLevelBar->setValue(deviceInfo->batteryLevel());
// connect(deviceInfo, SIGNAL(batteryLevelChanged(int)),
// ui->batteryLevelBar, SLOT(setValue(int)));
}

MainWindow::~MainWindow()
{
delete ui;
}
@

]]>https://forum.qt.io/post/137071https://forum.qt.io/post/137071Thu, 26 Apr 2012 11:29:33 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 08:27:18 GMT]]>Did you mean 18-23?
@// Press Button to see Battery Status Bar
//void MainWindow::ButtonClicked() {
// if (ui->batteryLevelBar->isVisible())
// ui->batteryLevelBar->setVisible(false);
// else
// ui->batteryLevelBar->setVisible(true);
//}@

]]>https://forum.qt.io/post/137046https://forum.qt.io/post/137046Thu, 26 Apr 2012 08:27:18 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 08:20:34 GMT]]>Hi,

I commented out:

mainwindow.h:

  • nothing

mainwindow.cpp:

  • lines: 3, 13, 18-21, 27-30

main.cpp:

  • line 3

pro file:

  • removed the qmobilityglobal.h file
]]>https://forum.qt.io/post/137045https://forum.qt.io/post/137045Thu, 26 Apr 2012 08:20:34 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 08:16:01 GMT]]>Can you share what you commented out? I commented out the #include qmobilityglobal.h lines and get these errors:

@..\gui\mainwindow.cpp: In member function 'void MainWindow::setupGeneral()':
..\gui\mainwindow.cpp:28: error: no matching function for call to 'QSysInfo::QSysInfo(MainWindow* const)'
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qglobal.h:1526: note: candidates are: QSysInfo::QSysInfo()
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qglobal.h:1526: note: QSysInfo::QSysInfo(const QSysInfo&)
..\gui\mainwindow.cpp:29: error: 'class QSysInfo' has no member named 'batteryLevel'
..\gui\mainwindow.cpp:31: error: no matching function for call to 'MainWindow::connect(QSysInfo*&, const char*, QProgressBar*&, const char*)'
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h:204: note: candidates are: static bool QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType)
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h:217: note: static bool QObject::connect(const QObject*, const QMetaMethod&, const QObject*, const QMetaMethod&, Qt::ConnectionType)
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h:337: note: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
mingw32-make.exe[1]: Leaving directory `C:/Users/sabrina/Documents/Sabrina/QT Creator/Projects/senior project/gui-build-desktop-Qt_4_8_1_for_Desktop_-_MinGW__Qt_SDK__Debug'
mingw32-make.exe[1]: *** [debug/mainwindow.o] Error 1
mingw32-make.exe: *** [debug] Error 2
02:12:54: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project gui (target: Desktop)
When executing build step 'Make'@

]]>https://forum.qt.io/post/137043https://forum.qt.io/post/137043Thu, 26 Apr 2012 08:16:01 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 08:02:52 GMT]]>Hi,

I had to comment out some stuff, especially the mobility things and then i could compile it. so perhaps it's something inside qmobilityglobal.h ?

I just tried it on windows with Qt 4.7.3

]]>https://forum.qt.io/post/137041https://forum.qt.io/post/137041Thu, 26 Apr 2012 08:02:52 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 07:45:07 GMT]]>oops..sorry, updated it. Thanks for pointing that out.

]]>https://forum.qt.io/post/137036https://forum.qt.io/post/137036Thu, 26 Apr 2012 07:45:07 GMT<![CDATA[Reply to Battery status Problem on Thu, 26 Apr 2012 07:39:59 GMT]]>If you put the mainwindow.h code in instead the project files one, it woul be helpful :-)

]]>https://forum.qt.io/post/137035https://forum.qt.io/post/137035Thu, 26 Apr 2012 07:39:59 GMT