Comparison of two distinct pointers

mallika.k.v

I'm fresher .Started to learn QT programming.

I'm trying to compare two pointers.

Below is my progragram,

@
msgBox = new QMessageBox(this);

  QPushButton *connectButton = msgBox->addButton(tr("Connect"), QMessageBox::ActionRole);

  QPushButton *abortButton = msgBox->addButton(QMessageBox::Abort);

  msgBox->exec&#40;&#41;;

if (msgBox->clickedButton() == connectButton) {
msgBox->setText("exit"); // connect
} else if (msgBox->clickedButton() == abortButton) {
// abort
qApp->quit();
}
@
Error:
comparison of two distinct pointers.im no getting what is the error is.

can any one help me in this?

sierdzio

Please use '@' tags when posting code on this forum. I've modified your post to add them.

QMessageBox::clickedButton() returns a pointer to QAbstractButton, yet your connectButton is a QPushButton. I would not think that is a problem, but apparently it is. So, try this:
@
if (qobject_cast<QPushButton *>(msgBox->clickedButton()) == connectButton) {
msgBox->setText("exit"); // connect
} else if (qobject_cast<QPushButton *>(msgBox->clickedButton()) == abortButton) {
// abort
qApp->quit();
}
@

SGaist

Hi,

Why note re-use the code from the documentation example ?
@
QMessageBox messageBox(this);
QAbstractButton *disconnectButton =
messageBox.addButton(tr("Disconnect"), QMessageBox::ActionRole);
...
messageBox.exec();
if (messageBox.clickedButton() == disconnectButton) {
...
}@

It uses QAbstractButton

DBoosalis

Why not just check the status returned by QMessageBox::exec()