Question about an example of “C++ GUI Programming with Qt 4

bc913

Hi,

I am working on the same example with QT 4.8.4 and QT Creator 2.6.2. When I run it, several errors including the followings occur. I have tried all the ways from the forum but I haven’t fixed.

I have cleaned the project, rebuild and run qmake. But, it doesn’t solve. Any help is appreciated.

Regards,

error: C2628: ‘FindDialog’ followed by ‘int’ is illegal (did you forget a ‘;’?)
error: C3874: return type of ‘main’ should be ‘int’ instead of ‘FindDialog’ 3. error: C2664: ‘FindDialog::FindDialog(QWidget *)’ : cannot convert parameter 1 from ‘int’ to ‘QWidget *’
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast

@ //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(QString &)),this, SLOT(enableFindButton(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() // kullanici find butonunu tıkladığında calisir
{
    QString text = lineEdit->text();
 
    Qt::CaseSensitivity cs = caseCheckBox->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;
 
    if (backwardCheckBox->isChecked()) { //backward Checkbox secili ise findPrevious sinyali yayar
        emit findPrevious(text, cs);}
    else {
        emit findNext(text, cs);}
}
 
 void FindDialog::enableFindButton(const QString &text) // satır editöründe metin degisiligi olunca finbutton calistirilir...
{
  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: // sinyal bildirimleri
    void findNext(const QString &str, Qt::CaseSensitivity cs);
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);
private slots: // yuva bildirimleri
    void findclicked();
    void enableFindButton(const QString &text);
private:
    QLabel *label;
    QLineEdit *lineEdit;
    QCheckbox *caseCheckBox;
    QCheckbox *backwardCheckBox;
    QPushButton *findButton;
    QPushButton *closeButton;
}
 
#endif // FINDDIALOG_H

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

@

mwright

Hi,

In the header file did you end the class definition with a semi-colon. The example you have shown hasn't.

bc913

Hi,

Yer, you are right. I forgot it but after I have added the semi-colon, error situation continues. Only the number of errors were decreased...

Only, the errors about QCheckBox still exist.

mwright

Can you provide the error(errors) and line(lines) in the code the compiler is pointing to?

bc913

Here is the error list,

@error C2440: '=' : cannot convert from 'QCheckBox *' to 'QCheckbox *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
..\bc1\finddialog.cpp(12) : error C2440: '=' : cannot convert from 'QCheckBox *' to 'QCheckbox *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
..\bc1\finddialog.cpp(30) : error C2664: 'QBoxLayout::addWidget' : cannot convert parameter 1 from 'QCheckbox *' to 'QWidget *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
..\bc1\finddialog.cpp(31) : error C2664: 'QBoxLayout::addWidget' : cannot convert parameter 1 from 'QCheckbox *' to 'QWidget *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
..\bc1\finddialog.cpp(48) : error C2039: 'findClicked' : is not a member of 'FindDialog'
d:\bc913\egitim\yazilim\qt\proje\bc1\FindDialog.h(11) : see declaration of 'FindDialog'
..\bc1\finddialog.cpp(50) : error C2065: 'lineEdit' : undeclared identifier
..\bc1\finddialog.cpp(50) : error C2227: left of '->text' must point to class/struct/union/generic type
type is ''unknown-type''
..\bc1\finddialog.cpp(52) : error C2065: 'caseCheckBox' : undeclared identifier
..\bc1\finddialog.cpp(52) : error C2227: left of '->isChecked' must point to class/struct/union/generic type
type is ''unknown-type''
..\bc1\finddialog.cpp(54) : error C2065: 'backwardCheckBox' : undeclared identifier
..\bc1\finddialog.cpp(54) : error C2227: left of '->isChecked' must point to class/struct/union/generic type
type is ''unknown-type''
..\bc1\finddialog.cpp(55) : error C3861: 'findPrevious': identifier not found
..\bc1\finddialog.cpp(57) : error C3861: 'findNext': identifier not found@

bc913

Error lines:
//finddialog.cpp

Lines: 11,12,30,31,48,50,52,55, 56, 58

mwright

Okay so you have a typo for QCheckbox. it should be QCheckBox. please check your code and let us know of any other issue.

mwright

you also need to include the QString header. thats why it is complaining on line 50. The compiler has no idea about QString

bc913

Thanks a lot,

Also, I have mistaken on findclicked function. I will be much more careful,

Regards,

iamfrankenstein

Aren’t you suppose to terminate a class definition with ‘;’?
I don’t see that in you header file finddialog.h

That is what the compiler means with “did you forget a ‘;’?”
I’ll check in a few hours to see your response if its not the case.

(Why have you posted you question twice??)

iamfrankenstein

Ow its closed now??