Updating Pyqt Status Bar widget

Question

How can I update the status bar widget? Also How can i use signals and threads instead of a button? Thanks! Can someone help me out, my code is not working, when i press the button nothing comes up, i also get an error: ``` Error: self.a = QtGui.QStatusBar.showMessage("System Status | Normal") TypeError: QStatusBar.showMessage(QString, int msecs=0): first argument of unbound method must have type 'QStatusBar' from PyQt4 import QtGui,QtCore import sys class main_window(QtGui.QWidget): def __init__(self,parent=None): #Layout QtGui.QWidget.__init__(self,parent) self.bt=QtGui.QPushButton('crash') self.lbl=QtGui.QLabel('count') ver=QtGui.QHBoxLayout(self) ver.addWidget(self.bt) self.cnt=0 self.running=False self.connect(self.bt,QtCore.SIGNAL("clicked()"),self.count) self.a = QtGui.QStatusBar.showMessage("System Status | Normal") ver.addWidget(self.a) self.timer = QtCore.QTimer() self.timer.timeout.connect(self.count) # check every second self.timer.start(1000*1) def count(self): a = open("…

Accepted Answer

You have this code:

```
    self.a = QtGui.QStatusBar.showMessage("System Status | Normal")
    ver.addWidget(self.a)
```

`showMessage` is not a class method, you need a `QStatusBar` instance for it. I think you wanted to do this:

```
    self.a = QtGui.QStatusBar(self)
    ver.addWidget(self.a)
    self.a.showMessage("System Status | Normal")
```

Maybe it would be easier to subclass `QMainWindow`? Then you could use `QMainWindow.statusBar`:

```
class MainWindow(QtGui.QMainWindow):

def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)

self.bt = QtGui.QPushButton('crash')
        self.lbl = QtGui.QLabel('count')

self.cnt = 0
        self.running = False

self.bt.clicked.connect(self.count) # new style signal/slot connection

# http://doc.qt.nokia.com/4.7-snapshot/qmainwindow.html#statusBar
        self.statusBar().showMessage("System Status | Normal")

#Layout
        vert_layout = QtGui.QHBoxLayout()
        vert_layout.addWidget(self.bt)
        self.main_widget = QtGui.QWidget(self)
        self.main_widget.setLayout(vert_layout)
        self.setCentralWidget(self.main_widget)

self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.count)
        # check every second
        self.timer.start(1000*1)

def count(self):
        a = open("connection_cpu.txt", "r").read()
        if a == "CPU Overclocked":
            abnormal_label = QtGui.QLabel("System Status | Normal")  
            abnormal_label.setStyleSheet(' QLabel {color: red}')
            self.statusBar().addWidget(abnormal_label)
            self.repaint()
        else:
            normal_label = QtGui.QLabel("System Status | Normal")
            self.statusBar().addWidget(normal_label)
            self.repaint()
```

Updating Pyqt Status Bar widget

Solution

Problem