Getting a function to call another function

[wysota]

From what I understand you locationUpdated() is a slot called from a signal from the position tracking source and you wish to be able to do some calculations based on the received position but not immediately after you get it but instead at some later point in time, correct?

If so, declare a variable in your class and in locationUpdated() (change the name of the slot, it's really weird) assign the position object you receive to the newly declared variable. Then in other methods you will be able to fetch the position value from the variable.

[bmn]

sorry for the inconvenience
what i really want is to call the variables
qreal longitude
qreal latitude

in my other function calcMax();

what i did was add the variables to my head and write this

void MainWindow::calcMax() {
 
 
    ui->maxLabel->setText(QString::number(latitude));

void MainWindow::calcMax() {


    ui->maxLabel->setText(QString::number(latitude));

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it cant make the connection to my previous function tho :

[ChrisW67]

If you declare latitude and longitude in the scope of locationUpdated() then that is the only place you can access them directly from. You need to find a good C++ reference and read about the C++ scope rules.

Make latitude and longitude private member variables of the class. It is also good practice to make sure that the constructor initialises them.

class MainWindow: ...
{
public:
  ...
private:
  qreal latitude;
  qreal longitude;
}

class MainWindow: ...
{
public:
  ...
private:
  qreal latitude;
  qreal longitude;
}

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[SixDegrees]

If you declare latitude and longitude in the scope of locationUpdated() then that is the only place you can access them directly from. You need to find a good C++ reference and read about the C++ scope rules.

Make latitude and longitude private member variables of the class. It is also good practice to make sure that the constructor initialises them.

class MainWindow: ...
{
public:
  ...
private:
  qreal latitude;
  qreal longitude;
}

class MainWindow: ...
{
public:
  ...
private:
  qreal latitude;
  qreal longitude;
}

To copy to clipboard, switch view to plain text mode 

Minor nitpick: make them protected members of the class, rather than private members. This will make it easier on anyone extending the class in the future.

[wysota]

Another tip: use QGeoPositionInfo or QGeoCoordinate instead of latitude and longitude.