How to get the role of a QPushButton created by a QDialogButtonBox?

I'm trying get all the button child widgets of a currently active window. The buttons were created开发者_开发技巧 through QDialogButtonBox. I'm trying to get the roles of each button so I can identify which button is the OK, CANCEL, or SAVE button. However I'm getting an error with the following code:

QWidget *pWin = QApplication::activeWindow();
QList<QPushButton *> allPButtons = pWin->findChildren<QPushButton *>();
QListIterator<QPushButton*> i(allPButtons);
while( i.hasNext() )
{
    QDialogButtonBox *pButtonRole = new QDialogButtonBox();
    QDialogButtonBox::ButtonRole role = pButtonRole->buttonRole(i.next()); 
    qDebug() << "buttonRole: " << role << endl ;  
    //the value of role here is -1, which means it's an invalid role...      
}

I'm getting a negative value when getting the button's role :(

Can somebody tell me what's wrong with the code?

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You can't call a non-static method like that. You need to have the QDialogButtonBox variable and call that particular instance for buttonRole() to work.

QDialogButtonBox::ButtonRole role = myButtonBoxPtr->buttonRole(i.next());

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You are creating a new empty QDialogButtonBox which has no idea about buttons in allPButtons list. Calling buttonRole() on them returns -1 (InvalidRole) because buttons are not in that button-box.

You must do as jkerian wrote and myButtonBoxPtr must point to the QDialogButtonBox which is already in your window.

You can try something like this (if you have one ButtonBox):

QDialogButtonBox *box = pWin->findChild<QDialogButtonBox *>();
foreach(QAbstractButton* button, box->buttons())
{ qDebug() << box->buttonRole(button); }