Access to different variables?

AlexKrammer

Is there a possibility to access in one funktion to different variables.

MainWindow HeaderFile:

private:
bool Test1 = false;
bool Test2 = false;
bool Test3 = false;
.
.
.

i just tried different way but it don´t work.

MainWindow SourceFile:

Try 1:
void MainWindow::on_comboBox_currentIndexChanged(int x)
{
        Test(x) = true;
}
Try 2:
void MainWindow::on_comboBox_currentIndexChanged(int x)
{
        "Test" + x = true;
}
Try 3:
void MainWindow::on_comboBox_currentIndexChanged(int x)
{
        Test + x = true;
}

cause in that case its working:

 for(int i = 1 ; i <= Initialisationlist.count() ; i++)
 {
        QLabel * label   = this->findChild<QLabel   *>("label_"+QString::number(i));
        QComboBox * CBox = this->findChild<QComboBox*>("CBoxSensor_"+QString::number(i));

        if(label && (Initialisationlist.at(i-1) != "w1_bus_master1"))
        {
            CBox->clear();
            CBox->addItem("N.C.");
            label->setText(Initialisationlist.at(i-1));
            for (int x=1 ; x <= Initialisationlist.count(); x++)
            {
                CBox->addItem(QString::number(x));
            }
            CBox->setCurrentIndex(0);
            label->setVisible(true);
            CBox->setVisible(true);
        }
 }

Pl45m4

@AlexKrammer

Your vector needs to be a member of MainWindow in order to access it from every function.
(m_ already suggests it)

// Header
QVector<bool> m_tests;

// code
for(int i = 0; i < 3; i++)
        m_tests.push_back(false); // or append


void MainWindow::on_comboBox_currentIndexChanged(int i)
{
        m_tests[i] = true;
}

@AlexKrammer said in Access to different variables?:

if (m_qTestVector[1] == 1)

Yes

ollarch

Hi,

You could use QList or QVector:

QVector m_qTestVector;
for (int i=0; i<3; i++)
  m_qTestVector.append(false);

...
void MainWindow::on_comboBox_currentIndexChanged(int i)
{
        m_qTestVector[i] = true;
}

Pl45m4

@AlexKrammer

This is very basic C++ / OOP knowledge and not related to Qt ;-)

Your variable name can not be a variable itself. So you can't access Test1 with

int x = 1;
Test + x = true; // Test + x does NOT equal Test1 variable

Put all your Test- bools in one array (QVector for example) and use x as index to access them

@AlexKrammer said in Access to different variables?:

cause in that case its working:
label_"+QString::number(i)

This works, because it's still a string and you can append anything you want

SGaist

Hi,

Adding to @Pl45m4:
@AlexKrammer said in Access to different variables?:

QLabel * label = this->findChild<QLabel *>("label_"+QString::number(i));

You are not accessing any local variable here. You are looking down the tree of objects that are child of your widget. This is a different concept.

AlexKrammer

@SGaist @Pl45m4

I understand.
But whats the right way to use a QVector in that case?

and so that I can access the variable again later.

i that way like @ollarch said the right way or do you think a other way would be better:

QVector m_qTestVector;
for (int i=0; i<3; i++)
  m_qTestVector.append(false);

...
void MainWindow::on_comboBox_currentIndexChanged(int i)
{
        m_qTestVector[i] = true;
}

and later i can call:?

 if (m_qTestVector[1] == 1)
{
     ....
}

Pl45m4

@AlexKrammer

Your vector needs to be a member of MainWindow in order to access it from every function.
(m_ already suggests it)

// Header
QVector<bool> m_tests;

// code
for(int i = 0; i < 3; i++)
        m_tests.push_back(false); // or append


void MainWindow::on_comboBox_currentIndexChanged(int i)
{
        m_tests[i] = true;
}

@AlexKrammer said in Access to different variables?:

if (m_qTestVector[1] == 1)

Yes

SGaist

@AlexKrammer said in Access to different variables?:

if (m_qTestVector[1] == 1)
{
....
}

Since m_TestVector is supposed to be a vector of Boolean, you should write your if accordingly. Otherwise you are going to make your code uselessly hard to reason about.