[Solved] using customized QPushButton on QWizard

gor kogalo

Hello every one. I want to use a QPushButton on QWizardPage. I have implemented the qwizard pages and added QPushButton as follows in the code bellow. When I click the button, the signal and slot connection does not work. Any idea on how to go around it? Thanks in advance for your response.

@class DatabasePage : public QWizardPage
{

public:
DatabasePage();

int nextId() const;

private slots:
void connectionTest();

private:
QPushButton *testConnBttn;
};@
@DatabasePage::DatabasePage()
{
.....
testConnBttn = new QPushButton(tr("Test connection"));
QHBoxLayout *bttnLayout = new QHBoxLayout;
bttnLayout->addStretch();
bttnLayout->addWidget(testConnBttn);

setLayout(bttnLayout);
connect(testConnBttn, SIGNAL(clicked()), this, SLOT(connectionTest()));

}
@
@void DatabasePage::connectionTest()
{
QMessageBox::information(this,"WATCH","Error");

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName( "localhost");
db.setDatabaseName( "test" );
db.setUserName( "root" );
db.setPassword( "hqo" );
if ( !db.open() )
{
    QMessageBox::information(this,"WATCH",db.lastError().text());
}

}
@

raven-worx

when the connection fails the reason will be printed to the console.
Also you can check the boolean return value of the connect-statement indicating if it failed or succeeded.

gor kogalo

Thanks for the response. On the Application Output console, this is what I get:
@Object::connect: No such slot QWizardPage::connectionTest() in ../smif/setupwizard.cpp:272@

raven-worx

you're missing the Q_OBJECT macro ;)
@
class DatabasePage : public QWizardPage
{
Q_OBJECT
....
}
@

SGaist

Hi,

You are missing the Q_OBJECT macro in your DatabasePage declaration

gor kogalo

Thanks for pointing this out. Initially I had this macro and the error was the same.

SGaist

Where do you declare your DatabasePage class ?

gor kogalo

I have declared it in my setupWizard header file. This is how I have done it:
@
class setUpWizard : public QWizard
{
public:
enum { Page_Intro, Page_Admin, Page_School, Page_Subjects,
Page_Database, Page_Conclusion };
setUpWizard();
protected:

private slots:
void showHelp();

};
class DatabasePage : public QWizardPage
{

public:
DatabasePage();

int nextId() const;

private slots:
void connectionTest();

private:
QPushButton *testConnBttn;
};@

I get the following error when I assign Q_OBJECT macro to both setUPWizard class and DatabasePage class
@
C:\Users\GORDON\project\smif-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug..\smif\setupwizard.cpp:202: error: undefined reference to `vtable for DatabasePage'
@

SGaist

This error usually appears when you didn't re-run qmake after adding/removing Q_OBJECT

gor kogalo

thanks I re-run qmake and it is now working.....I glad for your help

SGaist

You're welcome :)

Since it's working, you can update the thread's title by prepending [solved] so other forum users will know a solution has been found :)