[Qt4] need help with QFileDialog

[patcito]

I wrote this funtion:

void GenerateInvoiceDialog::on_saveandPrintpushButton_cliked(){
    QString s = QFileDialog::getSaveFileName(
                    this,
                    "Choose a filename to save under",
                    "/home",
                    "Images (*.html)");
}

void GenerateInvoiceDialog::on_saveandPrintpushButton_cliked(){
    QString s = QFileDialog::getSaveFileName(
                    this,
                    "Choose a filename to save under",
                    "/home",
                    "Images (*.html)");
}

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unfortunately nothing happens when I click on my saveandPrintpushButton. Isn't that supposed to start a file dialog? Thanx in advance

Patcito