Error unknown typ name 'DS18B20'

[mrjj]

@AlexKrammer
And you only have one instance of the CheckTemperature class?
since S.getHystTemperature(); in mainwindow.cpp Works
it should also in CheckTemperature so i wonder if you have 2 of them or something like that ?

[AlexKrammer]

@mrjj
no i only have one instance.
i only have one checktemp in class CheckTemperature, one gethysttemperature() in class SetTemperature, and one actualTemp in class ReadTemperature.
thats why im wondering too.
cause im calling checktemp() every 500ms in loop mainwindow.

Is there any possibility that i can't call object in a method of a single class. But there is no sense

[mrjj]

@AlexKrammer
That is very odd then.
The 500ms loop is a QTimer?

Sorry I cant guess what could be wrong. It sounds like the parts are working but
not in all use cases.

[AlexKrammer]

@mrjj yes for sure. other thing in the loop are working. e.g. if i call directly in the loop every 500ms "ui->temperature4lable->setText(QString::number(S.getHystTemperature()));"
the value changes every 500ms if i change the horizontal slider.

[mrjj]

Hi
Ok but that
S.getHystTemperature()
seems out side of the CheckTemperature class, correct ?

so you have
SetTemperature S;
ReadTemperature R;

in mainwindow too ? and those works but
inside the CheckTemperature they are not ?

[AlexKrammer]

@mrjj yes. right.
but i have:
SetTemperature S;
ReadTemperature R;

in CheckTemperature too

[mrjj]

@AlexKrammer
and that's the part that really bugs me as if those classes work alone in MainWindow, i cannot see a reason they should not work in that other class just the same ??

void CheckTemperature::CheckTemp()
could just have well been

void MainWindow::CheckTemp()

and the difference is really small.

[AlexKrammer]

@mrjj no in MainWindow is no CheckTemp() methode.

[mrjj]

@AlexKrammer
Yes that is ganz klar.
Im just saying its odd that inside CheckTemperature the
same classes dont work but outside in mainwindow it seems fine.
I cant guess on why. Seems odd.

[AlexKrammer]

@mrjj
Is there a possibility to share a code with you?
I just created a simple code to show my problem.

[mrjj]

@AlexKrammer
Yes even i cant really run it i can look it over and see if i get a hint.
use https://wetransfer.com/
click the (...) button and switch to link type
then drag zipped project to there
and paste link here.

[AlexKrammer]

@mrjj link text

Now i created the project on Windows.
You should be able to run it.

The two commented debug lines in checktemperature.cpp and mainwindow.cpp show the misstake.
if you are uncomment one in checktemperature.cpp its still stay at 0.
Also if you uncomment this: //qDebug() << C.TempEin; //must be the value of the horizontal slider in mainwindow.cpp. its still stay at 0.

Try to run that example

[mrjj]

@AlexKrammer
Super. I will later tonight. I have to drive now :)
had a fast look.
You are not setting anything to C. only reading from it.
Nothing changes the S and R inside C.
Only the ones you have free in main.
So that is why it stays at zero.

[AlexKrammer]

@mrjj
For sure. I'm trying to use this class to compare something.
So yeah nothing changes S and R inside C but S.getHystTemperature(); will be changed if the Slider moved. and R.actualTemp1 will be changed, if cnt hit 3 in MainWindow::LOOP
or rather in real if the sensor will be evaluated.
So if i call the methode C.CheckTemp(); S.getHystTemperature() and R.actualTemp1 do have values who could be compare.
if i code:

TempEin = S.getHystTemperature();
Test = R.actualTemp1;

i'm going to set the Variable TempEin equal to S.getHystTemperature() (Which is changed when the slider moved)
and i'm going to set Test equal to R.actualTemp1 (Which every times change when cnt hits 3 in MainWindow)
Or isnt that the correct way to compare something or rather put values from a other class into a class?

[mrjj]

Hi
Just so we agree. Nothing you do in mainwindow with S/R
will have any effect on the S and R in C.

• C.CheckTemp(); S.getHystTemperature() and R.actualTemp1 do have values who could be compare.

Yes if in real code something actually changes them.
In the Demo, they will always stay zero as the slider changes S/R in main and
those new values are not out into C.
so in demo code
C.TempEin will never change.

Else i see nothing wrong but I not sure why you have both
SetTemperature S;
ReadTemperature R;
in maniwindow

and then also in C. could those in C not be enough ?

[AlexKrammer]

@mrjj
No that is not true.
In mainwindow i change the slider. So i change HystTemperature.
That will change S.getHystTemperature(); too. Doesnt it?

Also every 2.5 second when the cnt hit 3 in mainwindow. The actualTemp1 will be incremented with 1. So R.actualTemp will be greater then before. Doesnt it?
So why are in Class C the Variable not changing?

In order to to change the varibale like in my fault. I must have this in MainWindow. When i move the slider im going to change the variable HystTemperature.
Here in the demo its the same like in real. Every 2.5 second the sensor will be evaluated. So here in the demo only incremented with 1.

Im changing the Variable R.actualTemp1 and S.getHystTemperature in MainWindow.
In order to compare both varibales i created a new class.
So why arent in Class CheckTemperature the variables changed?

[mrjj]

@AlexKrammer

• That will change S.getHystTemperature(); too. Doesnt it?
  Hi
  Not at all. the S/R in mainwindow are on its own and will not affect those in C.

• So why arent in Class CheckTemperature the variables changed?

As nothing changes them.

Maybe this is why i get confused about what is not working.

The slider changes the values of S/R in MainWin. Not in C.s / C.r so
did you expect the values in C to also change ?

[AlexKrammer]

@mrjj
well if i change the variable of e.g. Class" SetTemperature" float "HystTemperature"
And if i call the methode S.getHystTemperature(); i try to get the variable HystTemperature.

Or is that the wrong way to put the Varible which is changed by the slider into the Class "CheckTemperature"

then my next question would be how can I do that? :)
Putting the changed variable "HystTemperature" from class "SetTemperature" and the changed variable "actualTemp1" from class "ReadTemperature" into the class "CheckTemperature".

[mrjj]

@AlexKrammer
hi
to change the one inside C with slider it has to be

void MainWindow::on_horizontalSlider_valueChanged(int x)
{
    float y;
  ///  S.setHystTemperature(x);
 C.S.setHystTemperature(x);

///    y = S.getHystTemperature();
 C.S.getHystTemperature(x);
    QString Temp = QString::number(y);
    ui->label->setText(Temp + "°C");
}

• Putting the changed variable "HystTemperature" from class "SetTemperature" and the changed variable "actualTemp1" from class "ReadTemperature" into the class "CheckTemperature".

auto value1 = S.getHystTemperature();
auto value2 = R.actualTemp1;

C.setHystTemperature(value1);
C.R.actualTemp1 = value2;

something like that.

Its very confusing you named the classes as function names :)
SetTemperature rally looks like a function but its a class.

[AlexKrammer]

@mrjj

 auto value1 = S.getHystTemperature();
 auto value2 = R.actualTemp1;
 C.setHystTemperature(value1);
 C.R.actualTemp1 = value2;

i dont understand this step... cause i dont have a C.setHystTemperature thats a methode at SetTemperature

void MainWindow::on_horizontalSlider_valueChanged(int x)
{
    float y;
  ///  S.setHystTemperature(x);
 C.S.setHystTemperature(x);

///    y = S.getHystTemperature();
 C.S.getHystTemperature(x);
    QString Temp = QString::number(y);
    ui->label->setText(Temp + "°C");
}

if you write: C.S.setHystTemperature(x); do you set HystTemperature in Set Temperature and also in CheckTemperature? Do I understand right?