'ISO C++ forbids declaration of ‘QSystemDeviceInfo’ with no type' in QT SDK for Linux

[vitalisam]

Hi,
It's my first try of Nokia QT SDK under linux platform (Debian 5.0).

I was trying to build an example: BatteryLevel indicator for Symbian. But SDK complains about this line,
with error 'ISO C++ forbids declaration of ‘QSystemDeviceInfo’ with no type':

#include <QDialog>
#include <QSystemInfo>

namespace Ui {
    QTM_USE_NAMESPACE
    class BatteryIndicator;
}

class BatteryIndicator : public QDialog
{
    Q_OBJECT

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

private:
    QSystemDeviceInfo *deviceInfo;
    Ui::BatteryIndicator *ui;
    void setupGeneral();
};

What could be a reason?

[divanov]

Move QTM_USE_NAMESPACE out of namespace Ui.

[vitalisam]

Thanks! It helps

[flax1972]

Hi,
I was trying to compile my first application (battery level) using Nokia Qt SDK 1.1,
when I got the same error 'ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type..'

Here the code in .h

// checksum 0x9a77 version 0x20001
/*
This file was generated by the Mobile Qt Application wizard of Qt Creator.
MainWindow is a convenience class containing mobile device specific code
such as screen orientation handling.
It is recommended not to modify this file, since newer versions of Qt Creator
may offer an updated version of it.
*/

#ifndef MAINWINDOW_H
#define MAINWINDOW_H



#include <QtGui/QMainWindow>
#include <QSystemInfo>

QTM_USE_NAMESPACE

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
enum ScreenOrientation {
ScreenOrientationLockPortrait,
ScreenOrientationLockLandscape,
ScreenOrientationAuto
};

explicit MainWindow(QWidget *parent = 0);
virtual ~MainWindow();

void setOrientation(ScreenOrientation orientation);
void showExpanded();

private:
Ui::MainWindow *ui;
void setupGeneral();
QSystemDeviceInfo *deviceInfo;
};

#endif // MAINWINDOW_H


Can anyone help me ?

thnks in advance

[divanov]

How does your project file looks like?

[flax1972]

here is the .pro file :

# Add files and directories to ship with the application
# by adapting the examples below.
# file1.source = myfile
# dir1.source = mydir
DEPLOYMENTFOLDERS = # file1 dir1

# Avoid auto screen rotation
#DEFINES += ORIENTATIONLOCK

# Needs to be defined for Symbian
DEFINES += NETWORKACCESS

symbian:TARGET.UID3 = 0xE1A897EA

# If your application uses the Qt Mobility libraries, uncomment
# the following lines and add the respective components to the
# MOBILITY variable.
CONFIG += mobility
MOBILITY += systeminfo

SOURCES += main.cpp mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui

# Please do not modify the following two lines. Required for deployment.
include(deployment.pri)
qtcAddDeployment()

regards

[divanov]

Verify that QSystemInfo exist

find ~/NokiaQtSDK/ -name "QSystemInfo"

[flax1972]

naturally I missed to say OS is Windows XP SP2 and I have downloaded the package Qt_SDK_Win_offline_v1_1_TP_en
This is the output of the command...looks dir is there

C:\QtSDK>dir QSystemInfo /s
Il volume nell'unità C non ha etichetta.
Numero di serie del volume: 3CAE-2534

Directory di C:\QtSDK\Maemo\4.6.2\sysroots\fremantle-arm-sysroot-20.2010.36-2-slim\usr\include\QtSystemInfo

26/01/2011 14.34 25 QSystemInfo
1 File 25 byte

Directory di C:\QtSDK\Simulator\QtMobility\mingw\include\QtSystemInfo

26/01/2011 14.42 33 QSystemInfo
1 File 33 byte

Directory di C:\QtSDK\Symbian\SDKs\Symbian1Qt471\epoc32\include\middleware

26/01/2011 14.52 33 QSystemInfo
1 File 33 byte

Directory di C:\QtSDK\Symbian\SDKs\Symbian3Qt471\epoc32\include\mw

26/01/2011 14.52 33 QSystemInfo
1 File 33 byte

Totale file elencati:
4 File 124 byte
0 Directory 1.511.854.080 byte disponibili

[lpotter]

The QtSDK does not have QtMobility for the desktop target. You will need to use the simulator or a device target.

[flax1972]

Hi,
I followed step by step the Battery Indicator example:

after installing QtSDK 1.1 on OS Win XP SP2 I created a Qt Mobile Application as shown in the examples Battery Indicator(with targets Simulator and Symbian 3 checked );

the error I posted refers to Simulator target , below the full error stack:

Starting: "C:\QtSDK\mingw\bin\mingw32-make.exe" -w
mingw32-make: Entering directory `C:/Dev/BatteryIndicator-build-simulator'
C:/QtSDK/mingw/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/Dev/BatteryIndicator-build-simulator'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DNETWORKACCESS -DQT_DLL -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_HAVE_MMX -DQT_HAVE_3DNOW -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\QtSDK\Simulator\Qt\mingw\include\QtCore" -I"..\..\QtSDK\Simulator\Qt\mingw\include\QtNetwork" -I"..\..\QtSDK\Simulator\Qt\mingw\include\QtGui" -I"..\..\QtSDK\Simulator\Qt\mingw\include" -I"c:\QtSDK\Simulator\Qt\mingw\include\QtSystemInfo" -I"c:\QtSDK\Simulator\Qt\mingw\include\QtMobilitySimulator" -I"..\..\QtSDK\Simulator\QtMobility\mingw\include" -I"..\..\QtSDK\Simulator\QtMobility\mingw\include\QtMobility" -I"..\..\QtSDK\Simulator\QtMobility\mingw\include\QtSystemInfo" -I"..\..\QtSDK\Simulator\Qt\mingw\include\ActiveQt" -I"debug" -I"." -I"..\BatteryIndicator" -I"." -I"..\..\QtSDK\Simulator\Qt\mingw\mkspecs\win32-g++" -o debug\main.o ..\BatteryIndicator\main.cpp
In file included from ..\BatteryIndicator\main.cpp:1:
..\BatteryIndicator\/mainwindow.h:43: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\BatteryIndicator\/mainwindow.h:43: error: expected ';' before '*' token
mingw32-make[1]: Leaving directory `C:/Dev/BatteryIndicator-build-simulator'
mingw32-make: Leaving directory `C:/Dev/BatteryIndicator-build-simulator'
mingw32-make[1]: *** [debug/main.o] Error 1
mingw32-make: *** [debug] Error 2
The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
Error while building project BatteryIndicator (target: Qt Simulator)
When executing build step 'Make'

I tried on Symbian Device as target also (after installing Qt and Qt mobility) and the error is shown below:

FAILED compile for arm.v5.udeb.gcce4_4_1: main.cpp
mmp: BatteryIndicator_exe.mmp

FAILED compile for arm.v5.udeb.gcce4_4_1: mainwindow.cpp
mmp: BatteryIndicator_exe.mmp

FAILED compile for arm.v5.udeb.gcce4_4_1: moc\moc_mainwindow.cpp
mmp: BatteryIndicator_exe.mmp
make[1]: *** [C:/QtSDK/Symbian/SDKs/Symbian3Qt471/epoc32/build/batteryindicator/c_15aee0cdff0fe883/batteryindicator_exe/armv5/udeb/main.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: *** [C:/QtSDK/Symbian/SDKs/Symbian3Qt471/epoc32/build/batteryindicator/c_15aee0cdff0fe883/batteryindicator_exe/armv5/udeb/mainwindow.o] Error 1
make[1]: *** [C:/QtSDK/Symbian/SDKs/Symbian3Qt471/epoc32/build/batteryindicator/c_15aee0cdff0fe883/batteryindicator_exe/armv5/udeb/moc_mainwindow.o] Error 1
sbs: error: The make-engine exited with errors.
C:\QtSDK\Symbian\SDKs\Symbian3Qt471\epoc32\tools\make.exe: Leaving directory `C:/Dev/BatteryIndicator'
C:\QtSDK\Symbian\SDKs\Symbian3Qt471\epoc32\tools\make.exe: *** [debug-gcce] Error 1
The process "C:\QtSDK\Symbian\SDKs\Symbian3Qt471\epoc32\tools\make.exe" exited with code 2.
Error while building project BatteryIndicator (target: Symbian Device)
When executing build step 'Make'

Is possible for you to reproduce the error ?

Can you tell me if I'm making a mistake or is some problem in my environment or a bug of the package ?

Regards

[divanov]

You should clean the project and run qmake after switching the targets.

[flax1972]

After cleaning the project Im getting the following Compile out messages (could not find sm files):

Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\debug\moc_mainwindow.cpp
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\debug\moc_mainwindow.cpp
....
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\debug\main.o
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\debug\main.o
......
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\release\moc_mainwindow.cpp
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\release\moc_mainwindow.cpp

Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\ui_mainwindow.h
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\ui_mainwindow.h
.......
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\release\main.o
Impossibile trovare C:\Dev\BatteryIndicator-build-simulator\release\main.o
...
In file included from ..\BatteryIndicator\main.cpp:1:
In file included from ..\BatteryIndicator\main.cpp:1:
..\BatteryIndicator\/mainwindow.h:43: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\BatteryIndicator\/mainwindow.h:43: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\BatteryIndicator\/mainwindow.h:43: error: expected ';' before '*' token
..\BatteryIndicator\/mainwindow.h:43: error: expected ';' before '*' token

and after run qmake

Running build steps for project BatteryIndicator...
Starting: "c:\qtsdk\simulator\qt\mingw\bin\qmake.exe" C:\Dev\BatteryIndicator\BatteryIndicator.pro -r -spec win32-g++ QMLJSDEBUGGER_PATH=C:/QtSDK/QtCreator/share/qtcreator/qml/qmljsdebugger
WARNING: c:\QtSDK\Simulator\Qt\mingw\mkspecs\features\mobility.prf:1: Unescaped backslashes are deprecated.
WARNING: c:\QtSDK\Simulator\Qt\mingw\mkspecs\features\mobility.prf:1: Unescaped backslashes are deprecated.
WARNING: c:\QtSDK\Simulator\Qt\mingw\mkspecs\features\mobility.prf:1: Unescaped backslashes are deprecated.
The process "c:\qtsdk\simulator\qt\mingw\bin\qmake.exe" exited normally.


The error is still there. Have any suggestions ?

[sassi67]

The same problem with the same example under Vista Home premium 64bit SP2 with Nokia QT SDK 1.1 TP.

Target is "Qt Simulator" and the project file is:

QT += core gui

TARGET = BatteryIndicator
TEMPLATE = app


SOURCES += main.cpp\
batteryindicator.cpp

HEADERS += batteryindicator.h

FORMS += batteryindicator.ui

CONFIG += mobility
MOBILITY += systeminfo

symbian {
TARGET.UID3 = 0xe89f1eeb
# TARGET.CAPABILITY +=
TARGET.EPOCSTACKSIZE = 0x14000
TARGET.EPOCHEAPSIZE = 0x020000 0x800000
}

[danhicksbyron]

..\BatteryIndicator\/mainwindow.h:43: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\BatteryIndicator\/mainwindow.h:43: error: ISO C++ forbids declaration of 'QSystemDeviceInfo' with no type
..\BatteryIndicator\/mainwindow.h:43: error: expected ';' before '*' token
..\BatteryIndicator\/mainwindow.h:43: error: expected ';' before '*' token

I'd look at whatever is just before line 43 in mainwindow.h. There may be a syntax error there, either in mainwindow.h directly, or in another included file.

And sometimes the problem is in the file that includes, eg, mainwindow.h, or in some include ahead of it.

A missing ";" at the end of a class declaration is a common problem.

[flax1972]

This is th mainwindow.h


// checksum 0x9a77 version 0x20001
/*
This file was generated by the Mobile Qt Application wizard of Qt Creator.
MainWindow is a convenience class containing mobile device specific code
such as screen orientation handling.
It is recommended not to modify this file, since newer versions of Qt Creator
may offer an updated version of it.
*/

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

#include <QSystemInfo>

QTM_USE_NAMESPACE

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
enum ScreenOrientation {
ScreenOrientationLockPortrait,
ScreenOrientationLockLandscape,
ScreenOrientationAuto
};

explicit MainWindow(QWidget *parent = 0);
virtual ~MainWindow();

void setOrientation(ScreenOrientation orientation);
void showExpanded();

private:
Ui::MainWindow *ui;
void setupGeneral();
QSystemDeviceInfo *deviceInfo;
};

#endif // MAINWINDOW_H

I think this problem is related to the declaration of the nemaspace QTM_USE_NAMESPACE

I got the same problem on develope env Linux also.

May be this release may have a problem.