Cant keep a second window open when pressing on a button

smoussa

class MainWindow(QMainWindow):
switch_window=pyqtSignal(str)
def init(self):
super().init()

    self.initUI()

def initUI(self):
    #Initialize
    self.setGeometry(1000, 300, 1200, 800)
    self.setWindowTitle('Sensorlyze')
    self.setWindowIcon(QIcon('biosensor.jpg'))
    icon = QIcon('biosensor.jpg')

    # Add Text
    l1= QLabel("Welcome to SensorLyze",self)
    l1.move(25, 350)
    # l1.setWordWrap(True)
    l1.setFont(QFont('Calibri',15))
    l1.adjustSize()
    l2 = QLabel("A software to simply sensor analytics", self)
    l2.move(25, 400)
    l2.setFont(QFont('Calibri', 10))
    l2.adjustSize()

    #Add Buttons
    button1 = QPushButton('Start',self)
    button1.resize(button1.sizeHint())
    button1.clicked.connect(start_clicked)
    button1.move(60, 450)
    button2 = QPushButton('Exit', self)
    button2.resize(button2.sizeHint())
    button2.clicked.connect(exit_clicked)
    button2.move(240, 450)

stylesheet = """
QMainWindow {
background-image: url("C:/Users/admin/Desktop/Sensorlyze/biosensor.jpg");
background-repeat: no-repeat;
background-position: center;
}
"""

def switch(self):

self.switch_window.emit(self.line_edit.text())

def start_clicked():
window=QMainWindow()
window.setGeometry(300, 500, 500, 500)
window.setWindowTitle('Hello')
window.show()
win.hide()

def exit_clicked():
msgBox=QMessageBox()
msgBox.setIcon(QMessageBox.Information)
msgBox.setText("Are you sure you want to exit?")
msgBox.setWindowTitle("Exit Sensorlyze")
msgBox.setStandardButtons(QMessageBox.Ok|QMessageBox.Cancel)
msgBox.buttonClicked.connect(msgButtonClick)
returnValue = msgBox.exec()

if returnValue==QMessageBox.Ok:
    exit()

def msgButtonClick(i):
print("Buttonclickedis:",i.text())

def main():
app = QApplication(sys.argv)
app.setStyleSheet(stylesheet) # <---
win=MainWindow()
win.show()
sys.exit(app.exec_())

if name == 'main':
main()

mrjj

Hi and welcome to the forums
What do you mean ?
So when you click a button and this is run
def start_clicked():
window=QMainWindow()
window.setGeometry(300, 500, 500, 500)
window.setWindowTitle('Hello')
window.show()
win.hide()

the win Is closed or what you mean cant keep open ?

jsulm

@smoussa said in Cant keep a second window open when pressing on a button:

def start_clicked():
window=QMainWindow()

You're creating a local variable (window) which is destroyed as soon as start_clicked() terminates...