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emailhy
29th October 2006, 03:44
I start to learn qt use the book C++ GUI programming with QT4
and i type the ch02 's sourcefile
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());
}
void FindDialog::findClicked()
{
QString text = lineEdit->text();
Qt::CaseSensitivity cs=
caseCheckBox->isChecked() ? Qt::CaseSensitive
: Qt::CaseInsensitive;
if (backwardCheckBox->isChecked()) {
emit findPrevious(text,cs);
} else {
emit findNext(text, cs);
}
}
void FindDialog::enableFindButton(const QString &text)
{
findButton->setEnabled(!text.isEmpty());
}_

**********************************
finddialog.h

#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QDialog>
class QCheckBox;
class QLabel;
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

***********************************8
main.cpp


#include <QApplication>
#include "finddiaglog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv)
FindDialog *dialog = new FindDialog;
dialog->show();
return app.exec();
}

i use mingw and type
qmake -project
qmake
make

the output show

g++ -c -O2 -O2 -frtti -fexceptions -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"D:/Qt/4.2.1/include/QtCore" -I"D:/Qt/4.2.1/include/QtCore" -I"D:/Qt/4.2.1/include/QtGui" -I"D:/Qt/4.2.1/include/QtGui" -I"D:/Qt/4.2.1/include" -I"." -I"D:/Qt/4.2.1/include/ActiveQt" -I"release" -I"." -I"d:\Qt\4.2.1\mkspecs\win32-g++" -o release\finddialog.o finddialog.cpp
finddialog.cpp:54: error: expected constructor, destructor, or type conversion at end of input

i don't know what's wrong with the code? please help

jpn
29th October 2006, 08:32
I can only see a few minor misspellings there:

finddialog.cpp:


void FindDialog::enableFindButton(const QString &text)
{
findButton->setEnabled(!text.isEmpty());
}_ // <-- remove the additional underscore


main.cpp:


#include "finddiaglog.h" // <-- typo
...
QApplication app(argc, argv); // <-- semicolon missing


PS. Please use [ code ] -tags to make code snippets more readable..

stinos
29th October 2006, 09:57
I tkink you should also explicitely call "delete" on top-level widgets, else it never gets deallocated:



//...
FindDialog *dialog = new FindDialog;
dialog->show();
const int nReturnValue = app.exec();
delete dialog;
return nReturnValue;