Qt-interest Archive, August 2007
error: ISO C++ forbids declaration of 'QLabel' with no type
Message 1 in thread
Hi:
If you look at the compiler output, below, you will see a
"finddilog.h:47" error. I can't seem to locate the problem. The code
was copied, verbatim, from the C++ GUI Programming with Qt4 book by
Blanchette and Summerfield.
I am working on a Linux, Debian Etch system. While I use the Gnome X11
desktop, I am using KDevelop for project management software. (a
really, really nice environment to work in). I have KDevelop setup for
using Qt and qmake compiler system. On the first programs I compiled,
everything worked fine. This one doesn't. HELP!
COMPILER OUTPUT------------------------------------------------
cd '/home/gary/projects/testing' && make -k
cd src/ && make -f Makefile
g++ -c -pipe -g -D_REENTRANT -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB
-I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore
-I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui
-I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I. -o moc_finddialog.o
moc_finddialog.cpp
finddialog.h:47: error: ISO C++ forbids declaration of 'QLabel' with no type
finddialog.h:47: error: expected ';' before '*' token
make[1]: *** [moc_finddialog.o] Error 1
make[1]: Target `first' not remade because of errors.
<br />
make: *** [sub-src-make_default] Error 2
make: Target `first' not remade because of errors.
*** Exited with status: 2 ***
MAIN.CPP------------------------------------------------------------------
#include <QApplication>
int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(application);
QApplication app(argc, argv);
// finddialog * mw = new finddialog();
// mw->show();
return app.exec();
}
FINDDIALOG.H------------------------------------------------------------
#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QDialog>
class QCheckBox;
class QLable;
class QLineEdit;
class QPushButton;
class FindDialog : public QDialog
{
Q_OBJECT
public:
FindDialog(QWidget *parent =0);
signals:
void findNext(const QString &str, Qt::CaseSensitivity cs);
void findPrevious(const QString &str, Qt::CaseSensitivity cs);
private slots:
void findClicked();
void enableFindButton(const QString &text);
private:
QLabel *label;
QLineEdit *lineEdit;
QCheckBox *caseCheckBox;
QCheckBox *backwardCheckBox;
QPushButton *findButton;
QPushButton *closeButton;
};
#endif
FINDDIALOG.CPP---------------------------------------------------------
#include <QtGui>
#include "finddialog.h"
FindDialog::FindDialog(QWidget *parent)
: QDialog(parent)
{
label = new QLabel(tr("Find &what:"));
lineEdit = new QLineEdit;
label->setBuddy(lineEdit);
caseCheckBox = new QCheckBox(tr("Match &case"));
backwardCheckBox = new QCheckBox(tr("Search &backward"));
findButton = new QPushButton(tr("&Find"));
findButton->setDefault(true);
findButton->setEnabled(false);
closeButton = new QPushButton(tr("Close"));
connect(lineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableFindButton(const QString &)));
connect(findButton, SIGNAL(clicked()),
this, SLOT(findClicked()));
connect(closeButton, SIGNAL(clicked()),
this, SLOT(close()));
QHBoxLayout *topLeftLayout = new QHBoxLayout;
topLeftLayout->addWidget(label);
topLeftLayout->addWidget(lineEdit);
QVBoxLayout *leftLayout = new QVBoxLayout;
leftLayout->addLayout(topLeftLayout);
leftLayout->addWidget(caseCheckBox);
leftLayout->addWidget(backwardCheckBox);
QVBoxLayout *rightLayout = new QVBoxLayout;
rightLayout->addWidget(findButton);
rightLayout->addWidget(closeButton);
rightLayout->addStretch();
QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addLayout(leftLayout);
mainLayout->addLayout(rightLayout);
setLayout(mainLayout);
setWindowTitle(tr("Find"));
setFixedHeight(sizeHint().height());
}
SRC.PRO------------------------------------------------------------------------
SOURCES += main.cpp \
finddialog.cpp
TEMPLATE = app
CONFIG += warn_on \
thread \
qt4
TARGET = ../bin/testing
RESOURCES = application.qrc
HEADERS += finddialog.h
_____________________________________
GaryR
Message 2 in thread
On August 30, 2007 04:57:41 pm Gary L. Roach wrote:
> class QLable;
Should be:
class QLabel;
I think that's your only mistake.
--
[ signature omitted ]
Message 3 in thread
On 30.08.07 15:57:41, Gary L. Roach wrote:
> If you look at the compiler output, below, you will see a "finddilog.h:47"
> error. I can't seem to locate the problem. The code was copied, verbatim, from
> the C++ GUI Programming with Qt4 book by Blanchette and Summerfield.
I doubt that you copied that verbatim ;)
> class QLable;
There's a typo here.
> QLabel *label;
Which will cause an error here. Exactly how the compiler message says,
if the compiler complains about a type not being known check your
include's in that file and your forward declarations.
Andreas
--
[ signature omitted ]
Message 4 in thread
Thanks for the help and the suggestions. Dumb mistakes are sometime the
hardest to find.
GaryR
>
--
[ signature omitted ]
