Get variable from a dialog to MainWindow

Sucharek

Hello, I know that this "type" of post has already been created several times, but me being the noob I am, can't understand these...
So, I just want to know, how to get a value from a dialog, and give it to MainWindow.
Thanks

Pl45m4

@Sucharek said in Get variable from a dialog to MainWindow:

get a value from a dialog, and give it to MainWindow.

A QDialog class?

Either with signals & slots or as return value.

// MainWindow, where you start your dialog
Dialog dlg;
if (dlg.exec() == QDialog::Accepted)
{
   // simply call the getters from your dialog class to get the values
   int x = dlg.getMyNum();
   QString s = dlg.getMyString();
}

Sucharek

How do I call the getters?

Pl45m4

@Sucharek

int x = dlg.getMyNum();
QString s = dlg.getMyString();

These are already the function calls.

You have to have getMyNum() and getMyString() as public (getter) function in your dialog class. Then just return whatever you want to pass to your mainWindow (the return types have to match of course).

One of those functions could look like this:

// Dialog header
public:
  // ctor
 // ...
 int getMyNum(){ return m_myNumber; }

private:
    int m_myNumber;  // the private variable, you want to return

Sucharek

Ok, so I don't have any errors now, but if I click OK on my dialog, nothing happens.
I think that the
if (setWorkingDirectory.exec() == QDialog::Accepted)
doesn't work for me, because I put qDebug in there, and it doesn't print anything.

Pl45m4

@Sucharek said in Get variable from a dialog to MainWindow:

if I click OK on my dialog, nothing happens.

Is your Ok Button connected to accept()?? If you use the default button box, it should be the case by default. If you add your own buttons, you have to do it manually.

Add accept() at the end of the slot, which is called when you click your Ok button to finish your dialog.

https://doc.qt.io/qt-5/qdialog.html#details

Sucharek

It works now! Thanks
I'm sorry you have to deal with me, not understanding simple stuff.
Anyways, it all works now!
Thanks again :D

Pl45m4

@Sucharek said in Get variable from a dialog to MainWindow:

if (setWorkingDirectory.exec() == QDialog::Accepted)

BTW: It looks like yoou want to set a directory there. You can use QFileDialog class for this. Then you dont have to worry about the return function and your dialog design.

For example:

QString dir = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                                "/home",
                                                QFileDialog::ShowDirsOnly
                                                | QFileDialog::DontResolveSymlinks);

This can be called directly from your mainWindow without any additional QDialog class.

Sucharek

Ok, I will look into it.
Thanks for the tip!