How to save datas in QChart into a txt file?

firsnur96

I have a chart and in my drone are many values comes to the graph.
I want to save them.
How can i do such a thing?

jsulm

@firsnur96 said in How to save datas in QChart into a txt file?:

How can i do such a thing?

Using https://doc.qt.io/qt-5/qfile.html
You can also use https://doc.qt.io/qt-5/qdatastream.html if you want to store in binary format.

firsnur96

@jsulm

```
QFile file("Sakla/Info." + QTime::currentTime().toString("hh.mm.ss.'txt'"));

if(file.open(QIODevice::WriteOnly | QIODevice::Text))
{

        for (int i=0; i<160; i++ )
        {
            QTextStream out(&file);
            out << pars.t[i].f;

        }
 }
 file.close();



Is it true?

jsulm

@firsnur96 said in How to save datas in QChart into a txt file?:

Is it true?

Did you test?

firsnur96

@jsulm actually i try, it write some datas on the file but i dont know they are true or not.

I have this function

void Main:Avi_veri_isle()
{
    q_x++;
    grafige_deger_ekle(147, pars.t[TM_AV_1_vol_rpm].f);
    grafige_deger_ekle(116, pars.t[TM_AV_1_vtol_bat_vol].f);
    grafige_deger_ekle(117, pars.t[TM_AV_2_vol_rpm].f);
    grafige_deger_ekle(118, pars.t[TM_AV_2_vtol_bat_vol].f);

}

in grafige_deger_ekle function, i will append the numbers on the series
here is it

void Main:grafige_deger_ekle(int i, double number)
{
       seri[i]->append(q_x, number);
}

I want to write these numbers into the file.

jsulm

@firsnur96 said in How to save datas in QChart into a txt file?:

but i dont know they are true or not

How should I know? It is your data.
You should define a format you want to use to store these numbers in a file. For example one number per line in text file, or coma separated list or whatever you like.

firsnur96

@jsulm said in How to save datas in QChart into a txt file?:

How should I know? It is your data.

you are right.
I want to ask another thing, i was confused about where should i do the write operation.
Where should be placed my write function

jsulm

@firsnur96 said in How to save datas in QChart into a txt file?:

Where should be placed my write function

I don't know. Depends when you want to store the data in a file.