[SOLVED] Choose databits from combobox

Choose databits from combobox

I have a simple GUI for serial communication with an Arduino UNO. First I list all databit in an OrderedDict, then I put them in a combobox:

self.databits = OrderedDict([
            ('5', QtSerialPort.QSerialPort.Data5),
            ('6', QtSerialPort.QSerialPort.Data6),
            ('7', QtSerialPort.QSerialPort.Data7),
            ('8', QtSerialPort.QSerialPort.Data8)
        ])
        self.databit_comboBox.addItems(list(self.databits))

Then I run the code, I select an option from databits combobox (this is how I get data from combobox)

self.serial.setDataBits(self.databit_comboBox.currentData())

and when I press connect button, I get this error:

TypeError: setDataBits(self, QSerialPort.DataBits): argument 1 has unexpected type 'NoneType'

Solution

When you add data with addItems() method you only add text, so you will discard the second part. The solution is to iterate and separate each part:

databits = [
        ('5', QtSerialPort.QSerialPort.Data5),
        ('6', QtSerialPort.QSerialPort.Data6),
        ('7', QtSerialPort.QSerialPort.Data7),
        ('8', QtSerialPort.QSerialPort.Data8)
]
for text, databit in databits:
    self.databit_comboBox.addItem(text, databit)

# ...

self.serial.setDataBits(self.databit_comboBox.currentData())