class HMI to another class how make the dialog?

ZZR69

Hello,
I am working on a graphical interface which uses the HMI class to control a widget lcdNumber.
in another class i need to modify the value of lcdNumber but as I am no longer in the same class, the widget is no longer accessible and I have a message "self is not define).

i don't know how can i do this ? (i just put a piece of code i didn't put all the variables and configuration so you can see more clearly)
Thank you for your help

code_text
```class HMI(QDialog):
    def __init__(self):
        super(HMI, self).__init__()
        loadUi('BAI.ui',self)
        self.checkBox.stateChanged.connect(self.Alstom2570) #Programme Alstom -25°C à 70°C valider appel de la fonction Alstom2570
        self.spinBox.valueChanged.connect(self.etuve)
        self.lcdNumber.display(count)    
        #stateChanged

class Pi_hat_adc:
    def __init__(self,bus_num=1,addr=ADC_DEFAULT_IIC_ADDR):
        self.bus=Bus(bus_num)
        self.addr=addr
        print("adc")
def Alstom2570class():
               global count
               while T < SB :  #tant quon est a froid (en dessous du seuil bas
        
                GPIO.output(16, GPIO.HIGH)      #met la pin 16 à 1 (GPIO23)
        
                count=count+1 #incrémentation de la variable count pour compter les démarrages
        
                self.lcdNumber.display(count)
        
                QtTest.QTest.qWait((TonF)) # on bloque la sortie GPIO a 1 pendant 15 min

SGaist

Hi,

You can use signals and slots to communicate properly between your classes.

ZZR69

@SGaist I manage very well to do this in the same class on the other hand when it is necessary to pass from one class to another I do not know how to do it. do you have an example so i can understand? thank you

JonB

@ZZR69
You just need instances of the two classes you want to connect. Then:

signalling_instance.signal_name.connect(slot_instance.slot_name)

ZZR69

Thanks a lot,
for exemple in my code if i run like that i have error message on line :

code_text
``` self.lcdNumber.display(count)" self is not defined.

So i have try to replace this ligne by :

self.HMI.lcdNumber.connect(self.display(count))
and new error is : self.HMI.lcdNumber.connect(self.display(count))
AttributeError: 'Pi_hat_adc' object has no attribute 'HMI'

in fact i try to write the "count" variable of lcdNumber widget where is in class HMI

jsulm

@ZZR69 said in class HMI to another class how make the dialog?:

self.lcdNumber.display(count)" self is not defined.

Well, you seem to call this in a function which is not a method. Please show the code where you call this...

ZZR69

thanks , here you are the start code with HMI class where i write 0 in lcdNumber :

class HMI(QDialog):
    def __init__(self):
        super(HMI, self).__init__()
        loadUi('BAI.ui',self)
        self.checkBox.stateChanged.connect(self.Alstom2570) #Programme Alstom -25°C à 70°C valider appel de la fonction Alstom2570
        self.spinBox.valueChanged.connect(self.etuve)
        self.lcdNumber.display(count)    
        #stateChanged

After i have create a function called alstom2570()

def Alstom2570(self): #Fonction appele lors de la selection du programme Alstom -25°C à 70°C
        #Toutes les variables sont declare et initialise pour correspondre au programme T2
        print("case coche")#debug
        global SB #definition de la variable SB (temperature seuil bas mise ss tension)
        global SH #definition de la variable SH (temperature seuil haut mise ss tension)
        SB=600 #variable definissant le seuil de temperature basse (si la temperature etuve descend sous -20°C mise ss tension)-20°C=600mV
        SH=3001 #variable definissant le seuil de temperature haute (si la temperature etuve depasse 65°C mise ss tension) 65°C=3001mV
        ####on choisis -20 et 65 afin d etre sur que l etuve arrive a ces temperature et quil n'y ai pas doscillation de temperature
        ###ayant pour effet des demarrages alleatoirs
        global TonF
        TonF=15*60000 #Temps ON 15min en ms (mise ss tension) a froid (seuil bas)
        global ToffF
        ToffF=15*60000 #Temps OFF 15min (mise hors tension) à froid (seuil bas)
        global T
        #T=-25 #uniquement pour debug ensuite T sera la value par ladc
        print("appel programme alstom2570")
        
        Alstom2570class() #appel de la fonction permettant de sortir de class interface graphique Qt

in this function i call anoter function named Alstom2570class and here i need to write in lcdNumber :

self.lcdNumber.display(count)

but i can't acces to lcdNumber in this function...

SGaist

If that:
@ZZR69 said in class HMI to another class how make the dialog?:

Alstom2570class() #appel de la fonction permettant de sortir de class interface graphique Qt

refers to:
@ZZR69 said in class HMI to another class how make the dialog?:

def Alstom2570class()

then you have an issue in your understanding of how Python classes work as well as the signals and slots concept of Qt.

I would recommend to take a step back and start with a minimal application showing a QSpinBox and a QLabel. Then connect the spin box to a slot that will update the QLabel with its value. Once you have that working, you'll be able to implement your application.

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class HMI to another class how make the dialog?