| View previous topic :: View next topic |
| Author |
Message |
weirdo
Tux's lil' helper
Joined: 16 Apr 2002
Posts: 114
Location: Montreal/Quebec/Canada
|
 Posted: Sun Jul 28, 2002 3:45 am Post subject: Trying to learn qt |
 |
|
I am trying to learn qt. I am learning whit the trolltech tutorial at http://doc.trolltech.com/3.0/tutorial.html
I copied the hello world program in a hello.C files in a qt directory in my home directory. I tried compiling it whit g++ by doing | Code: | | g++ hello.C -o hello |
but this is the result
| Code: | sh-2.05a$ g++ hello.C -o hello
hello.C:7: qapplication.h: No such file or directory
hello.C:8: qpushbutton.h: No such file or directory
sh-2.05a$
|
so i tryied
| Code: | locate qapplication.h
|
which told me the header files where in /usr/qt/3/include/
after changing the 2 #include line in the hello world code whit the full path to the header files(see the code next) | Code: | /****************************************************************
**
** Qt tutorial 1
**
****************************************************************/
#include </usr/qt/3/include/qapplication.h>
#include </usr/qt/3/include/qpushbutton.h>
int main( int argc, char **argv )
{
QApplication a( argc, argv );
QPushButton hello( "Hello world!", 0 );
hello.resize( 100, 30 );
a.setMainWidget( &hello );
hello.show();
return a.exec();
}
|
this is the answer g++ gave me
| Code: | sh-2.05a$ g++ hello.C -o hello
In file included from /usr/qt/3/include/qobjectdefs.h:42,
from /usr/qt/3/include/qwindowdefs.h:43,
from /usr/qt/3/include/qwidget.h:42,
from /usr/qt/3/include/qdesktopwidget.h:42,
from /usr/qt/3/include/qapplication.h:42,
from hello.C:7:
/usr/qt/3/include/qglobal.h:595: qconfig.h: No such file or directory
In file included from /usr/qt/3/include/qobjectdefs.h:42,
from /usr/qt/3/include/qwindowdefs.h:43,
from /usr/qt/3/include/qwidget.h:42,
from /usr/qt/3/include/qdesktopwidget.h:42,
from /usr/qt/3/include/qapplication.h:42,
from hello.C:7:
/usr/qt/3/include/qglobal.h:654: qfeatures.h: No such file or directory
|
whats should i do now
p.s i try emerging qt again but it gave me the same thing |
|
| Back to top |
|
 |
Naan Yaar
Bodhisattva
Joined: 27 Jun 2002
Posts: 1549
|
| Posted: Sun Jul 28, 2002 4:13 am Post subject: |
|
|
The site you refer to has tips on how to build this project using "qmake -project" and qmake.
http://doc.trolltech.com/3.0/tutorial1-01.html
If you follow those instructions, you will be able to compile without problems. Note: you need to remove the fully qualified header path in your #include statements.
That is:
| Code: |
#include </usr/qt/3/include/qapplication.h>
#include </usr/qt/3/include/qpushbutton.h>
|
need to be changed to:
| Code: |
#include <qapplication.h>
#include <qpushbutton.h>
|
Also, you may want to check out how the -I works with g++/gcc. You can see it being used when the makefile executes. |
|
| Back to top |
|
|
weirdo
Tux's lil' helper
Joined: 16 Apr 2002
Posts: 114
Location: Montreal/Quebec/Canada
|
| Posted: Sun Jul 28, 2002 4:31 am Post subject: |
|
|
ok i've folowed the tutorial guidline but i get an error here is the whole result of the make
| Code: | sh-2.05a$ make
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/qt/3/include -I/usr/qt/3/mkspecs/linux-g++ -o main.o main.cpp
g++ -o qt main.o -L/usr/X11R6/lib -lXext -lX11 -lm
main.o: In function `main':
main.o(.text+0x1c): undefined reference to `QApplication::QApplication(int &, char **)'
main.o(.text+0x32): undefined reference to `QString::QString(char const *)'
main.o(.text+0x45): undefined reference to `QPushButton::QPushButton(QString const &, QWidget *, char const *)'
main.o(.text+0x67): undefined reference to `QString::shared_null'
main.o(.text+0x6f): undefined reference to `QString::shared_null'
main.o(.text+0x7c): undefined reference to `QStringData::deleteSelf(void)'
main.o(.text+0x8c): undefined reference to `QPushButton::resize(int, int)'
main.o(.text+0x96): undefined reference to `QApplication::setMainWidget(QWidget *)'
main.o(.text+0xa2): undefined reference to `QWidget::show(void)'
main.o(.text+0xab): undefined reference to `QApplication::exec(void)'
main.o(.text+0xb8): undefined reference to `QPushButton::~QPushButton(void)'
main.o(.text+0xc3): undefined reference to `QApplication::~QApplication(void)'
main.o(.text+0xf6): undefined reference to `QString::shared_null'
main.o(.text+0xfe): undefined reference to `QString::shared_null'
main.o(.text+0x10b): undefined reference to `QStringData::deleteSelf(void)'
main.o(.text+0x124): undefined reference to `QPushButton::~QPushButton(void)'
main.o(.text+0x13a): undefined reference to `QApplication::~QApplication(void)'
main.o: In function `QValueListPrivate<QString>::QValueListPrivate(void)':
main.o(.QValueListPrivate<QString>::gnu.linkonce.t.(void)+0x25): undefined reference to `QString::shared_null'
main.o(.QValueListPrivate<QString>::gnu.linkonce.t.(void)+0x2e): undefined reference to `QString::makeSharedNull(void)'
main.o: In function `QValueListPrivate<QString>::~QValueListPrivate(void)':
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x27): undefined reference to `QString::shared_null'
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x2f): undefined reference to `QString::shared_null'
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x3c): undefined reference to `QStringData::deleteSelf(void)'
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x69): undefined reference to `QString::shared_null'
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x71): undefined reference to `QString::shared_null'
main.o(.gnu.linkonce.t._._t17QValueListPrivate1Z7QString+0x7e): undefined reference to `QStringData::deleteSelf(void)'
main.o: In function `QValueListPrivate<QString>::insert(QValueListIterator<QString>, QString const &)':
main.o(.QValueListPrivate<QString>::gnu.linkonce.t.insert(QValueListIterator<QString>, QString const &)+0x27): undefined reference to `QString::QString(QString const &)'
main.o: In function `QValueListPrivate<QString>::QValueListPrivate(QValueListPrivate<QString> const &)':
main.o(.QValueListPrivate<QString>::gnu.linkonce.t.(QValueListPrivate<QString> const &)+0x25): undefined reference to `QString::shared_null'
main.o(.QValueListPrivate<QString>::gnu.linkonce.t.(QValueListPrivate<QString> const &)+0x2e): undefined reference to `QString::makeSharedNull(void)'
collect2: ld returned 1 exit status
make: *** [qt] Error 1
sh-2.05a$ |
|
|
| Back to top |
|
|
Naan Yaar
Bodhisattva
Joined: 27 Jun 2002
Posts: 1549
|
| Posted: Sun Jul 28, 2002 4:53 am Post subject: |
|
|
It seems to work OK on my box. The second (link) line looks like:
| Code: |
g++ -o qqq main.o -Wl,-rpath,/usr/qt/3/lib -L/usr/qt/3/lib -L/usr/X11R6/lib -lqt -lXext -lX11 -lm
|
You are missing the qt libraries and their path from your link line. You can probably edit the Makefile that qmake produces and change the line that says LIBS = ... to:
| Code: |
LIBS = $(SUBLIBS) -Wl,-rpath,$(QTDIR)/lib -L$(QTDIR)/lib -L/usr/X11R6/lib -lqt -lXext -lX11 -lm
|
I am not sure why qmake does not produce the library path. |
|
| Back to top |
|
|
weirdo
Tux's lil' helper
Joined: 16 Apr 2002
Posts: 114
Location: Montreal/Quebec/Canada
|
| Posted: Sun Jul 28, 2002 5:08 am Post subject: |
|
|
the g++ command you wrote works perfectly
I should learn more about gcc |
|
| Back to top |
|
|
trythil
Tux's lil' helper
Joined: 06 Jun 2002
Posts: 123
Location: RHIT, Terre Haute, IN, USA
|
| Posted: Sun Jul 28, 2002 8:40 am Post subject: |
|
|
The -I directive adds additional paths to search for system libraries. Thus, you could have added
-I/usr/qt/3/include
and have removed all those nasty directories in your #include directives (which is non-portable code anyway).
-L tells GCC to look in those directories for libraries that you choose to link against with -l. |
|
| Back to top |
|
|
credmp
Apprentice
Joined: 02 Jul 2002
Posts: 207
Location: Netherlands
|
| Posted: Tue Aug 06, 2002 7:50 am Post subject: |
|
|
With Qt one should always try to use the .pro files.... ie I use the following for one of my projects:
| Code: |
PROJECT = Application
CONFIG = warn_on debug qt
DEFINES = QT_THREAD_SUPPORT
TARGET = Application
TEMPLATE = app
unix:LIBS = -lqt-mt
|
Then run
| Code: |
qmake application.pro
|
which generates the Makefile with all the proper paths etc. the TEMPLATE directive is pretty crucial in this 
-- Arjen |
|
| Back to top |
|
|
|
Portage & Programming
