Slots and Connection of Forms...

[steve.bush]

Hi,

So I have a standalone application which has a QMainWindow. I created another application which is also a QMainWindow. I tried linking them using a button but it did not work. I then changed the second application to QDialog and then the button worked! But since I changed it from QMainWindow to QDialog, the slots stopped working on the new application (I guess the dialog cannot have many buttons..)

Anyway, how do I get this working so that the first QMainWindow opens the second QMainWindow or QDialog AND the buttons in the second application still work..?

Thanks.

[Lykurg]

It does not matter if it is a QDialog or a QMainWindow. So can you show us your code which is not working for both solution.

[steve.bush]

First app: MainWin

MainWin::MainWin(QWidget*p, Qt::WindowFlags f):QMainWindow(p,f)
{
	dSecond = NULL;  // QDialog
	ui.setupUi(this);
	connect(ui.action_Two, SIGNAL(activated()), this, SLOT(two()));
}
 
MainWin::~MainWin()
{
}
 
void MainWin::two()
{
	if(!dSecond)
	{
                dSecond = new QDialog(this);
		uiSecond.setupUi(dSecond);  //ui::Second uiSecond;
	}
        dSecond->exec();
}

MainWin::MainWin(QWidget*p, Qt::WindowFlags f):QMainWindow(p,f)
{
	dSecond = NULL;  // QDialog
	ui.setupUi(this);
	connect(ui.action_Two, SIGNAL(activated()), this, SLOT(two()));
}

MainWin::~MainWin()
{
}

void MainWin::two()
{
	if(!dSecond)
	{
                dSecond = new QDialog(this);
		uiSecond.setupUi(dSecond);  //ui::Second uiSecond;
	}
        dSecond->exec();
}

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Second app: Second

Second::Second(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Second)
{
    connect(ui->action_button, SIGNAL(clicked()), this, SLOT(func_clicked()));
}
 
discovery::~discovery()
{
    delete ui;
}
 
void discovery::func_clicked()
{
    QMessageBox::warning(0,"Test", "Test message. It works!");
}

Second::Second(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Second)
{
    connect(ui->action_button, SIGNAL(clicked()), this, SLOT(func_clicked()));
}

discovery::~discovery()
{
    delete ui;
}

void discovery::func_clicked()
{
    QMessageBox::warning(0,"Test", "Test message. It works!");
}

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This way shows the new app when the menu bar item is clicked, but the new app does not show warning message when button is pressed.

[Rhayader]

in second the SLOT is a

void Second::func_clicked()

void Second::func_clicked()

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and you have a

void discovery::func_clicked()

void discovery::func_clicked()

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Maybe the discovery is a relic from the previous implemantation?
(the same for the destructor. Does it compile???)

Check this:
http://www.qtcentre.org/faq.php?faq=qt_signalslot

[ChrisW67]

If these two QWidgets are in separate applications, as both the first and third posts both state/imply, then there is no amount of trickery that is going to make a signal in one trigger a slot in the other.

[steve.bush]

Working now!