Need help with QToolButton

[philipp1]

Store toolbar_but as a member variable. The toolbar_but in addButton() is different than in addToolBar(). It's just a dangling pointer in addButton().

I understand you. But how can I realise it? Toolbutton belongs to mainwindow and I call him in a dock window.

[jpn]

Sorry, I didn't understand. Realise what? You mean how can it be implemented?

// class declaration
class MainWindow : public ...
{
public:
	...
 
private:
	QToolBar* toolbar_but; // <--- a member variable
};

// class declaration
class MainWindow : public ...
{
public:
	...

private:
	QToolBar* toolbar_but; // <--- a member variable
};

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// class implementation
void MainWindow::addToolBar()
{
	// store the toolbar as a member variable for later usage
	toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}
 
void MainWindow::addButton()
{
	// use the member variable here
	btnpix = new QToolButton(toolbar_but, ""); 
}

// class implementation
void MainWindow::addToolBar()
{
	// store the toolbar as a member variable for later usage
	toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

void MainWindow::addButton()
{
	// use the member variable here
	btnpix = new QToolButton(toolbar_but, ""); 
}

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[philipp1]

I made as you say from the wery beginning.


class MainWindow : public QMainWindow {
Q_OBJECT

public:
....
QToolBar* toolbar_but;
void addToolBar();
void addButton();

mainwindow.cpp

void MainWindow::addButton()
{
//QToolBar* toolbar_but;
btnpix = new QToolButton(toolbar_but, "");
}

void MainWindow::addToolBar()
{
QToolBar* toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);

[jpn]

I made as you say from the wery beginning.

void MainWindow::addToolBar()
{
    // the problem is in here
    QToolBar* toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

void MainWindow::addToolBar()
{
    // the problem is in here
    QToolBar* toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

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You are storing the toolbar to a local variable, not to the member variable. It should be:

void MainWindow::addToolBar()
{
    // notice the missing type, you want to use the member variable, not to create a new local variable
    toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

void MainWindow::addToolBar()
{
    // notice the missing type, you want to use the member variable, not to create a new local variable
    toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

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[philipp1]

You are storing the toolbar to a local variable, not to the member variable. It should be:

void MainWindow::addToolBar()
{
    // notice the missing type, you want to use the member variable, not to create a new local variable
    toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

void MainWindow::addToolBar()
{
    // notice the missing type, you want to use the member variable, not to create a new local variable
    toolbar_but = new QToolBar("Open puctures",this, DockLeft , TRUE ,0);
}

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Have a great thanks from me. Puting types was my mistake.
//(may be its friday)