如何在PyQT4上显示消息框？

Question

I'd like a MessageBox to display when I click a button on my simple PyQT application. How can I declare two textboxes and have a MessageBox display with the text from both textboxes?

Here's my code far:

import sys
from PyQt4 import QtGui, QtCore

class myWindow(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        #The setGeometry method is used to position the control.
        #Order: X, Y position - Width, Height of control.
        self.setGeometry(300, 300, 500, 350)
        self.setWindowTitle("Sergio's QT Application.")
        self.setWindowIcon(QtGui.QIcon('menuScreenFolderShadow.png'))

        self.setToolTip('<i>Welcome</i> to the <b>first</b> app ever!')
        QtGui.QToolTip.setFont(QtGui.QFont('Helvetica', 12))

        txtFirstName = QtGui.?
        txtLastName = QtGui.?

        btnQuit = QtGui.QPushButton('Exit Application', self)
        btnQuit.setGeometry(340, 300, 150, 35)

        self.connect(btnQuit, QtCore.SIGNAL('clicked()'),
                    QtGui.qApp, QtCore.SLOT('quit()'))

app = QtGui.QApplication(sys.argv)
mainForm = myWindow()
mainForm.show()
sys.exit(app.exec_())

Answer 1

Since such simple code is a common request, I decided to hack something basic together, here you go:

from PyQt4.QtCore import *
from PyQt4.QtGui import *


class AppForm(QMainWindow):
    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)
        self.create_main_frame()       

    def create_main_frame(self):        
        page = QWidget()        

        self.button = QPushButton('joy', page)
        self.edit1 = QLineEdit()
        self.edit2 = QLineEdit()

        vbox1 = QVBoxLayout()
        vbox1.addWidget(self.edit1)
        vbox1.addWidget(self.edit2)
        vbox1.addWidget(self.button)
        page.setLayout(vbox1)
        self.setCentralWidget(page)

        self.connect(self.button, SIGNAL("clicked()"), self.clicked)

    def clicked(self):
        QMessageBox.about(self, "My message box", "Text1 = %s, Text2 = %s" % (
            self.edit1.text(), self.edit2.text()))



if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    form = AppForm()
    form.show()
    app.exec_()

Write something into the line edits (text boxes), click the button. Profit! :-)

Note: it can be done with less code, but this is a good PyQt coding practice - create a widget to serve as a central widget of a window, populate it with a layout, etc.

Answer 2

PyQt comes with examples when you install it. These examples contain a lot of very useful code and you can learn from them, as well as take whole code chunks and use them.

Check out, for example, the "Address book" example which pops message boxes along other things (search its sources for "messagebox").

Answer 3

from PyQt4 import QtGui, QtCore

class Window( QtGui.QWidget ):

    def __init__( self ):
        QtGui.QWidget.__init__( self )

        msgBox = QtGui.QMessageBox( self )
        msgBox.setIcon( QtGui.QMessageBox.Information )
        msgBox.setText( "Do not stare into laser with remaining eye" )

        msgBox.setInformativeText( "Do you really want to disable safety enforcement?" )
        msgBox.addButton( QtGui.QMessageBox.Yes )
        msgBox.addButton( QtGui.QMessageBox.No )

        msgBox.setDefaultButton( QtGui.QMessageBox.No ) 
        ret = msgBox.exec_()

        if ret == QtGui.QMessageBox.Yes:
            print( "Yes" )
            return
        else:
            print( "No" )
            return

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication( sys.argv )
    window = Window()
    # window.show()
    sys.exit( app.exec_() )

Source:

1. http://pyqt.sourceforge.net/Docs/PyQt4/qmessagebox.html
2. http://www.programcreek.com/python/example/62361/PyQt4.QtGui.QMessageBox