The QPushButton clicked event in the dialog, could not call the slot

zJinWei

When I click the mpLoginBtn button, nothing happen. Could you help me?
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int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(analyserec);
QApplication a(argc, argv);

CurllibPort port;
MainWindow w;
LoginDialog *pDlg = new LoginDialog( 0, &port );
if( pDlg->exec&#40;&#41; == QDialog::Accepted&#41; {
    w.showMaximized();
} else {
    return 0;
}

return a.exec&#40;&#41;;

}

LoginDialog::LoginDialog(QWidget *parent, CurllibPort *pCurl) :
QDialog(parent),
ui(new Ui::LoginDialog)
{
ui->setupUi(this);
#define CTL_HEIGHT 30
#define BTN_WIDTH 60
QGridLayout *pgLayout = new QGridLayout( this );
QLabel *pEmailLab = new QLabel( tr("Email:"), this );
mpUserEmailEdit = new QLineEdit( this );
mpUserEmailEdit->setFixedHeight( CTL_HEIGHT );
QLabel *pPassLab = new QLabel( tr("Password:"), this );
mpPasswordEdit = new QLineEdit( this );
mpPasswordEdit->setFixedHeight( CTL_HEIGHT );
mpPasswordEdit->setEchoMode( QLineEdit::Password );
mpLoginBtn = new QPushButton( tr("Login"), this );
mpLoginBtn->setFixedSize( BTN_WIDTH, CTL_HEIGHT );
mpLoginBtn->setDefault( true );

int nRow = 0;
pgLayout->addWidget( pEmailLab, nRow, 0 );
pgLayout->addWidget( mpUserEmailEdit, nRow, 1 );    
nRow++;
pgLayout->addWidget( pPassLab, nRow, 0 );
pgLayout->addWidget( mpPasswordEdit, nRow, 1 );
nRow++;
pgLayout->addWidget( mpLoginBtn, nRow, 1 );
   
this->setLayout( pgLayout );
mpCurl = pCurl;
connect( mpLoginBtn, SIGNAL(pressed()), this, SLOT(loginBtnSlot()) );

}
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dbzhang800

Hi, AFAIK, there is no signal called press() exist in QPushButton.

zJinWei

I use this statement:
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connect( mpLoginBtn, SIGNAL(clicked()), this, SLOT(loginBtnSlot()) );
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The result is same as using the statement:
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connect( mpLoginBtn, SIGNAL(pressed()), this, SLOT(loginBtnSlot()) );
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SGaist

Do you have a slot named loginBtnSlot in LoginDialog ?

Checkout the return value of connect and the console output for potential errors

raven-worx

as SGaist said, checking the console output on signal-slot-connection problems (always) gives a well readable hint what went wrong during the connection.

zJinWei

The program have a slot named loginBtnSlot in LoginDialog . The console output has no error about the signal-slot-connection problems.
When I use the statement:
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QMetaObject::Connection conn = connect( mpLoginBtn, SIGNAL(clicked()), this, SLOT(loginBtnSlot()) );
if( conn ) {
qDebug() << "conn is ok.";
}
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It can output "conn is ok.".
I add these statements below afterwards, then found that everything was all right.
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QPushButton *pCancelBtn = new QPushButton( tr("Cancel"), this );
connect( pCancelBtn, SIGNAL(clicked()), this, SLOT(reject()) );
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