我无法在pyqt中使用错误消息框

Question

In my init function, i've defined an error message box like this:

 self.error_msg = QtGui.QMessageBox()
 self.error_msg.setIcon(QtGui.QMessageBox.critical)
 self.error_msg.setWindowTitle("Error")
 self.error_msg.setDetailedText("")

on a different method, I try to call the message box like this, by setting the error text:

def detectRoot(self):
    euid = os.geteuid()
    if euid != 0:
        print "need to be root to run this program"
        self.logger.error("Not root, program exited")
        self.error_msg.setText("You need to be root to run this program")
        self.error_msg.exec_()
        exit(1)

However, I keep getting message a pyqt/python error:

self.error_msg.setIcon(QtGui.QMessageBox.critical)
TypeError: QMessageBox.setIcon(QMessageBox.Icon): argument 1 has unexpected type 'builtin_function_or_method'

Answer 1

According to the documentation :

QMessageBox::NoIcon : The message box does not have any icon.

QMessageBox::Question : An icon indicating that the message is asking a question. QMessageBox::Information : An icon indicating that the message is nothing out of the ordinary. QMessageBox::Warning : An icon indicating that the message is a warning, but can be dealt with.

QMessageBox::Critical : An icon indicating that the message represents a critical problem.

Change QtGui.QMessageBox.critical to QtGui.QMessageBox.Critical