#include <QString> error

**vieraci** · 28th October 2007, 06:08

In a header file included ina an app, the following include compiles:

Qt Code:

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#include <QString>

#include <QString>

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In another project, same file, it doesn't.
Error message is "no such file or directory"
However, if i put the full pathname and file in place, it compiles.

Qt Code:

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#include "/usr/local/Qt4/include/Qt/qstring.h"

#include "/usr/local/Qt4/include/Qt/qstring.h"

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Why ?

**momesana** · 28th October 2007, 06:11

Do you use qmake with both projects?

**vieraci** · 28th October 2007, 06:24

yes, even did them all:
qmake -project
qmake
make clean
make

**momesana** · 28th October 2007, 06:54

Did you use the qmake that corresponds to the specific version of Qt that you want to use. For example /usr/local/Qt4/bin/qmake in the latter case because your system may be ending up finding and using your systems Qt3 headers. Maybe you should try to use qmake with its fully qualified path and see what results come out of this.
/usr/local/Qt4/bin/qmake -project && /usr/local/Qt4/bin/qmake && make.

p.s. could you please attach the Makefile generated by qmake?
It has a lot of variables tha state where to find headers and libs.

Qt Code:

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...
INCPATH       = -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/mkspecs/linux-g++ -I. -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtCore -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtCore -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtGui -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtGui -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include -I. -I. -I.
LINK          = g++
LFLAGS        = -Wl,-rpath,/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib
LIBS          = $(SUBLIBS)  -L/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib -lQtGui -L/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib -L/usr/X11R6/lib -lpng -lSM -lICE -pthread -pthread -lXi -lXrender -lXrandr -lfreetype -lfontconfig -lXext -lX11 -lQtCore -lz -lm -pthread -lgthread-2.0 -lrt -lglib-2.0 -ldl -lpthread
AR            = ar cqs
RANLIB        =
QMAKE         = /usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/bin/qmake
...

...
INCPATH       = -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/mkspecs/linux-g++ -I. -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtCore -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtCore -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtGui -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include/QtGui -I/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/include -I. -I. -I.
LINK          = g++
LFLAGS        = -Wl,-rpath,/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib
LIBS          = $(SUBLIBS)  -L/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib -lQtGui -L/usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/lib -L/usr/X11R6/lib -lpng -lSM -lICE -pthread -pthread -lXi -lXrender -lXrandr -lfreetype -lfontconfig -lXext -lX11 -lQtCore -lz -lm -pthread -lgthread-2.0 -lrt -lglib-2.0 -ldl -lpthread
AR            = ar cqs
RANLIB        =
QMAKE         = /usr/local/Trolltech/Qt-4.4.0-snapshot-20071021/bin/qmake
...

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**jpn** · 28th October 2007, 07:57

What does "qmake -v" output?

**vieraci** · 28th October 2007, 08:12

Here is some output:

qmake -v
QMake version 2.01a
Using Qt version 4.3.2 in /usr/local/Qt4/lib

echo $PATH
/usr/local/Qt4/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games

Qt Code:

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TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
 
## The following line was manually inserted.
QT = sql gui
 
# Input
HEADERS += areacodescombobox.h clientNotebook.h ../../userFunc.h
FORMS += clientNotebook.ui
SOURCES += areacodescombobox.cpp clientNotebook.cpp main.cpp ../../userFunc.cpp

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .

## The following line was manually inserted.
QT = sql gui

# Input
HEADERS += areacodescombobox.h clientNotebook.h ../../userFunc.h
FORMS += clientNotebook.ui
SOURCES += areacodescombobox.cpp clientNotebook.cpp main.cpp ../../userFunc.cpp

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Doesn't make any difference if I use full pathname to qmake.
This is full error message:

make /usr/local/Qt4/bin/uic clientNotebook.ui -o ui_clientNotebook.h
Warning: name layoutWidget is already used
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_SQL_LIB -DQT_GUI_LIB -DQT_SHARED -I/usr/local/Qt4/mkspecs/linux-g++ -I. -I/usr/local/Qt4/include/QtGui -I/usr/local/Qt4/include/QtGui -I/usr/local/Qt4/include/QtSql -I/usr/local/Qt4/include/QtSql -I/usr/local/Qt4/include -I. -I. -I. -o areacodescombobox.o areacodescombobox.cpp
In file included from ./areacodescombobox.h:10,
from areacodescombobox.cpp:1:
./../../userFunc.h:7:19: error: QString: No such file or directory
./../../userFunc.h:8:23: error: QStringList: No such file or directory
make: *** [areacodescombobox.o] Error 1

Qt Code:

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// areacodescombobox.cpp
#include "./areacodescombobox.h"
...

// areacodescombobox.cpp
#include "./areacodescombobox.h"
...

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Qt Code:

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// areacodescombobox.h
#ifndef AREACODESCOMBOBOX_H
#define AREACODESCOMBOBOX_H
 
//#include <QWidget>
#include <QtSql>
#include <QSqlQuery>
#include <QComboBox>
#include <QApplication>
#include <QMessageBox>
#include "../../userFunc.h"
 
class AreacodesCombobox : public QComboBox
{
    Q_OBJECT
 
public:
   AreacodesCombobox(QWidget *parent = 0);
   void initializeFields();
   void setSelectedLocale(const QString& aSelectedLocale);
   void setSelectedAreacode(const QString& aSelectedAreacode);
   const QString& selectedLocale() const;
   const QString& selectedAreacode() const;
 
 private slots:
   void on_returnPressed();
 
 private:
   QString vSelectedLocale;
   QString vSelectedAreacode;
};

// areacodescombobox.h
#ifndef AREACODESCOMBOBOX_H
#define AREACODESCOMBOBOX_H

//#include <QWidget>
#include <QtSql>
#include <QSqlQuery>
#include <QComboBox>
#include <QApplication>
#include <QMessageBox>
#include "../../userFunc.h"

class AreacodesCombobox : public QComboBox
{
    Q_OBJECT

public:
   AreacodesCombobox(QWidget *parent = 0);
   void initializeFields();
   void setSelectedLocale(const QString& aSelectedLocale);
   void setSelectedAreacode(const QString& aSelectedAreacode);
   const QString& selectedLocale() const;
   const QString& selectedAreacode() const;

 private slots:
   void on_returnPressed();

 private:
   QString vSelectedLocale;
   QString vSelectedAreacode;
};

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Qt Code:

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/**************************************************************************
*        userFunc.h
*        Utility Functions
**************************************************************************/
#ifndef USERFUNC_H
#define USERFUNC_H
 
#include <QString>
#include <QStringList>
//#include "/usr/local/Qt4/include/Qt/qstring.h"
//#include "/usr/local/Qt4/include/Qt/qstringlist.h"
 
QString searchWordsClause( QString, QString, QString, bool, QString );
void addWhereClause( QString &, QString, QString,QString, QString, QString, QString);
 
#endif

/**************************************************************************
*        userFunc.h
*        Utility Functions
**************************************************************************/
#ifndef USERFUNC_H
#define USERFUNC_H

#include <QString>
#include <QStringList>
//#include "/usr/local/Qt4/include/Qt/qstring.h"
//#include "/usr/local/Qt4/include/Qt/qstringlist.h"

QString searchWordsClause( QString, QString, QString, bool, QString );
void addWhereClause( QString &, QString, QString,QString, QString, QString, QString);

#endif

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**momesana** · 28th October 2007, 08:19

Do you include userFunc.h from another project's directory (i.e. something outside of your projects root directory) or does it belong to your current project?
If it is from an outside project you set INCLUDEPATH in your projects .pro file to point to the directory containing the mentioned header and use unqualifiled header includes.

Qt Code:

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INCLUDEPATH += . /path/to/userFunc/

INCLUDEPATH += . /path/to/userFunc/

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Qt Code:

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#include <userFunc.h>
instead of
#include <../../userFunc.h>

#include <userFunc.h>
instead of
#include <../../userFunc.h>

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**jpn** · 28th October 2007, 08:31

It should be:

QT = core sql gui

or simply

QT += sql

(core and gui modules are enabled by default).

**vieraci** · 28th October 2007, 08:44

Originally Posted by jpn

It should be:

or simply

(core and gui modules are enabled by default).

Thanks jpn,
That fixed the problem I started with, now I'm left with the other problem I just posted.

**jpn** · 28th October 2007, 08:57

I suppose you should add areacodescombobox.h and areacodescombobox.cpp to clientNotebook.pro.

**vieraci** · 28th October 2007, 09:10

Originally Posted by jpn

I suppose you should add areacodescombobox.h and areacodescombobox.cpp to clientNotebook.pro.

It is already. Look at posted code above.

**jpn** · 28th October 2007, 09:14

Originally Posted by vieraci

It is already. Look at posted code above.

Oh, I thought you said it was a plugin..

Anyway, did you actually implement a function body for AreacodesCombobox constructor?

**vieraci** · 28th October 2007, 08:35

The current project is a plugin of the main app,
the main app is in
projects/thisProject/src
the plugin is in
projects/thisProject/src/notebooks/clientNotebook

I tried your suggestion, no different.

Some more information:
The areacodesCombobox is a promoted QcomboBox widget in the clientNotebook widget.
If I use the full pathname to QString and compile, I get a different error. Don't know if this is important or just confuses things even more...

clientNotebook.o: In function `Ui_ClientNotebook::setupUi(QWidget*)':
clientNotebook.cpp

.text._ZN17Ui_ClientNotebook7setupUiEP7QWidget[Ui_ClientNotebook::setupUi(QWidget*)]+0xf23): undefined reference to `AreacodesCombobox::AreacodesCombobox(QWidget*)'
clientNotebook.cpp

.text._ZN17Ui_ClientNotebook7setupUiEP7QWidget[Ui_ClientNotebook::setupUi(QWidget*)]+0x3211): undefined reference to `AreacodesCombobox::AreacodesCombobox(QWidget*)'
clientNotebook.cpp

.text._ZN17Ui_ClientNotebook7setupUiEP7QWidget[Ui_ClientNotebook::setupUi(QWidget*)]+0x37d7): undefined reference to `AreacodesCombobox::AreacodesCombobox(QWidget*)'
collect2: ld returned 1 exit status
make: *** [clientNotebook] Error 1

**jpn** · 28th October 2007, 11:22

Do you actually have a plugin interface, declared with Q_DECLARE_INTERFACE()?
Is the plugin exported with Q_EXPORT_PLUGIN2() macro?
Are you compiling it as static or dynamic plugin?
Are you using QPluginLoader to load it?

Perhaps you should take one of plugin examples as an implementation base?

That's how I implemented my first plugin. I took plug & paint as base and rewrote it to my needs. That way you'll get a working set of project files for starters.

**vieraci** · 28th October 2007, 11:36

I'll have a good read...

**vieraci** · 28th October 2007, 23:34

After reading up on plugins, my project was correct. However what I'm building is a Qt Designer plugin, not a dynamic or static runtime plugin.

On a closer read of the error message:

clientNotebook.o: In function `Ui_ClientNotebook::setupUi(QWidget*)':
clientNotebook.cpp

.text._ZN17Ui_ClientNotebook7setupUiEP7QWidget[Ui_ClientNotebook::setupUi(QWidget*)]+0xf23): undefined reference to `AreacodesCombobox::AreacodesCombobox(QWidget*)

Providing a default constructor resolved it.
So it appears that the compiler didn't add a default constructor.

**jpn** · 29th October 2007, 06:58

Originally Posted by vieraci

Providing a default constructor resolved it.
So it appears that the compiler didn't add a default constructor.

Like I said, "C++ compilers provide a default constructor in case you don't provide one. But in case you declare anything, you must also implement it".

**vieraci** · 29th October 2007, 07:29

Yes you were right, but I don't understand why a constructor wasn't declared by the compiler here ??

**jpn** · 29th October 2007, 08:29

Because you told compiler that you want to implement it yourself

Qt Code:

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class AreacodesCombobox : public QComboBox
{
public:
   AreacodesCombobox(QWidget *parent = 0); // <-- "hey compiler, i want to implement constructor myself!"
   ...
};

class AreacodesCombobox : public QComboBox
{
public:
   AreacodesCombobox(QWidget *parent = 0); // <-- "hey compiler, i want to implement constructor myself!"
   ...
};

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**vieraci** · 29th October 2007, 08:44

D...uuuuuhhhh... of course !! one can be really stupid at times.

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