pyQt5 Error

Question

QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1

i have made a progress bar and i'm trying to add a setProperty value to the bar.

While i'm doing this it's throuing this error.

Can anyone tell me why pyqt5 giving such errors.

Answer 1

Add a code snippet and copy and paste the error info. Make sure to mark the line that the error appears on.

Answer 2

@Slick
this is my function while calling this function when the percentage value is set to the progress bar it giving this error

def voltage_callback(self, object,attr_name, value):
print("number of cells : ", self.n)
value = dronekit_action.vehicle.battery.voltage
print("voltage: ", value)
min_voltage = self.n * 3.3
max_voltage = self.n * 4.2
steps = self.n * 0.009
perc = 0
voltage = round(value,1)
print("optimize voltage: ", voltage)
if voltage <= min_voltage:
perc = 0
elif voltage>min_voltage and voltage<=18:
diff = round((voltage - min_voltage),1)
perc = int(str(diff//steps).split(".")[0])

self.ui.label_5.setText((str(round(value,2))) +"v")

---> here, this line is througing the error
--------------------------------------------------------------
self.ui.progress_bar.setProperty("value", perc)
------------------------------------------------------------

------- error ---

QWidget::repaint: Recursive repaint detected
QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it?

Answer 3

Slick once look at the problem

Answer 4

this app cant run guis. Use pydroid