Open new dialog from a dialog in qt - qt

Question

I am trying to open a new dialog Window from a existing dialog on a a button click event,but I am not able to do this as i opened the dialog window from MainWindow.
I am trying with:
Dialog1 *New = new Dialog1();
New->show();
Is there a different way of opening dialog window form existing dialog Window???

Answer 1

There must be some other problem, because your code looks good to me. Here's how I'd do it:
#include <QtGui>
class Dialog : public QDialog
{
public:
Dialog()
{
QDialog *subDialog = new QDialog;
subDialog->setWindowTitle("Sub Dialog");
QPushButton *button = new QPushButton("Push to open new dialog", this);
connect(button, SIGNAL(clicked()), subDialog, SLOT(show()));
}
};
class MainWindow : public QMainWindow
{
public:
MainWindow()
{
Dialog *dialog = new Dialog;
dialog->setWindowTitle("Dialog");
dialog->show();
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.setWindowTitle("Main Window");
w.show();
return a.exec();
}
By the way, note how I've connected QPushButton's "clicked" signal to QDialog's "show" slot. Very handy.

Answer 2

I am new to QT and I did have a similar problem. In my case, I was calling the new dialog from a function from the main dialog. I was using dlg->show which does not wait until the result of the new dialog. Hence the program still running. I change dlg->show for dlg->exec and the dialog works now. In your code, the dialog seems to be a local variable, perhaps you have the same problem. Other option could be to use a static pointer instead.
Dialog1 *newDlg = new Dialog1();
this->hide();
int result = newDlg->exec();
this->show();
delete newDlg;

Answer 3

in mainwindow.h file you should declare a pointer to your new dialog
and include the new dialog.h like
#include <myNewDialog.h>
private:
Ui::MainWindow *ui;
MyNewDialog *objMyNewDialog;
and after that you can call your dialog to be shown up in mainwindow.cpp
like
void MainWindow::on_btnClose_clicked()
{
objMyNewDialog= new MyNewDialog(this);
objMyNewDialog->show();
}