hi

i am new to qt

i tried running a hello world source off of a tutorial i found

here is the source:

#include <qapplication.h>
#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();
}

then i did:

#qmake -project
#qmake
#make

and i get a whole thing of errors:

helloworld.o(.text+0x1d): In function `main':
: undefined reference to `QApplication::QApplication[in-charge](int&, char**)'
helloworld.o(.text+0x30): In function `main':
: undefined reference to `QString::QString[in-charge](char const*)'
helloworld.o(.text+0x44): In function `main':
: undefined reference to `QPushButton::QPushButton[in-charge](QString const&, QWidget*, char const*)'
helloworld.o(.text+0x62): In function `main':
: undefined reference to `QString::shared_null'
helloworld.o(.text+0x6d): In function `main':
: undefined reference to `QStringData::deleteSelf()'
helloworld.o(.text+0x87): In function `main':
: undefined reference to `QPushButton::resize(int, int)'
helloworld.o(.text+0x90): In function `main':
: undefined reference to `QApplication::setMainWidget(QWidget*)'
helloworld.o(.text+0x98): In function `main':
: undefined reference to `QWidget::show()'
helloworld.o(.text+0xa0): In function `main':
: undefined reference to `QApplication::exec()'
helloworld.o(.text+0xab): In function `main':
: undefined reference to `QPushButton::~QPushButton [in-charge]()'
helloworld.o(.text+0xb3): In function `main':
: undefined reference to `QApplication::~QApplication [in-charge]()'
helloworld.o(.text+0xe9): In function `main':
: undefined reference to `QString::shared_null'
helloworld.o(.text+0xf4): In function `main':
: undefined reference to `QStringData::deleteSelf()'
helloworld.o(.text+0x107): In function `main':
: undefined reference to `QPushButton::~QPushButton [in-charge]()'
helloworld.o(.text+0x117): In function `main':
: undefined reference to `QApplication::~QApplication [in-charge]()'
collect2: ld returned 1 exit status
make: *** [qt] Error 1


any suggestions?

thanks

Could you please paste the compilation output (the command you see after you type 'make'), before errors?

oh sorry

g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/default -I. -I. -I/usr/lib/qt-3.2.1/include -o helloworld.o helloworld.cpp
g++ -o qt helloworld.o -L/usr/X11R6/lib -lXext -lX11 -lm

there you go

You can also try -lqt-mt if the above doesn't work.

meh, i tried both but neither worked

the tutorial said all i had to do was:
#qmake -project
#qmake
#make

and then i could just run the binary

any suggestions?
thanks

try to add more #include
#include <qwidget.h>
#include <qpushbutton.h>
#include <qapplication.h>
(and put #include <qapplication.h> in last)

keefaz it didnt work
hrmm... i tried something new:

#include </usr/lib/qt-3.2.1/include/qwidget.h>
#include </usr/lib/qt-3.2.1/include/qpushbutton.h>
#include </usr/lib/qt-3.2.1/include/qapplication.h>

i typed out the path toe the headers and i get something new:

g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o helloworld.o helloworld.
cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qwidget.o /usr/lib/q
t-3.2.1/include/moc_qwidget.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qpushbutton.o /usr/l
ib/qt-3.2.1/include/moc_qpushbutton.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qapplication.o /usr/
lib/qt-3.2.1/include/moc_qapplication.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qobject.o /usr/lib/q
t-3.2.1/include/moc_qobject.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qbutton.o /usr/lib/q
t-3.2.1/include/moc_qbutton.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qdesktopwidget.o /us
r/lib/qt-3.2.1/include/moc_qdesktopwidget.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qtranslator.o /usr/l
ib/qt-3.2.1/include/moc_qtranslator.cpp
g++ -o qt helloworld.o moc_qwidget.o moc_qpushbutton.o moc_qapplicati
on.o moc_qobject.o moc_qbutton.o moc_qdesktopwidget.o moc_qtranslator.
o -L/usr/X11R6/lib -lXext -lX11 -lm
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o helloworld.o helloworld.
cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qwidget.o /usr/lib/q
t-3.2.1/include/moc_qwidget.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qpushbutton.o /usr/l
ib/qt-3.2.1/include/moc_qpushbutton.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qapplication.o /usr/
lib/qt-3.2.1/include/moc_qapplication.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qobject.o /usr/lib/q
t-3.2.1/include/moc_qobject.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qbutton.o /usr/lib/q
t-3.2.1/include/moc_qbutton.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qdesktopwidget.o /us
r/lib/qt-3.2.1/include/moc_qdesktopwidget.cpp
g++ -c -pipe -Wall -W -O2 -DQT_NO_DEBUG -I/usr/lib/qt-3.2.1/mkspecs/d
efault -I. -I. -I/usr/lib/qt-3.2.1/include -o moc_qtranslator.o /usr/l
ib/qt-3.2.1/include/moc_qtranslator.cpp
g++ -o qt helloworld.o moc_qwidget.o moc_qpushbutton.o moc_qapplicati
on.o moc_qobject.o moc_qbutton.o moc_qdesktopwidget.o moc_qtranslator.
o -L/usr/X11R6/lib -lXext -lX11 -lm


but i still get the error

and also some strange files appear in the directory i compiled helloworld in:

moc_qapplication.o
moc_qbutton.o
moc_qdesktopwidget.o
moc_qobject.o
moc_qpushbutton.o
moc_qtranslator.o
moc_qwidget.o

any suggestions?

hrmm i got it working now

i renamed it as main.cpp and it works now

lol

oh well thanks for the suggestions