How do i acces an other slot?

GhostWolf

Hello,

I like to know how i can acces something i created in an other slot?

void MainWindow::NewLog()
{   QFile file (QCoreApplication::applicationDirPath() +"/logs/"+ui->lineEdit->text() +".txt");
    file.open(QIODevice::WriteOnly | QIODevice::Text);
    
qDebug()<<file.fileName();
}


void MainWindow::saveSettings()
{   QString c_time = QTime::currentTime().toString();
    QString sText = c_time + " " 
            + ui->label_4->text()+ " "
            + ui->label_4->text()+ " "
            + ui->label_4->text();
    
qDebug()<< sText;

    QTextStream out(&file);
       out << sText;
}

This is my code, now i want to acces "file" from NewLog in the SaveSettings slot, is this possible?
i dont like to put it in the same slot, because now i can call SaveSettings with a timer and it will write the data to the log, without creating a a new log/destroing the last data.
Thnx

user4592357

slots are normal functions with some additional abilities added by qt. and since file is a local variable in NewLog(), you can't access it from saveSettings().

you can keep the path of the file (a string) as MainWindow's member, then create a QFile object using the path in your both slots.

aha_1980

@GhostWolf

and to add to @user4592357,

you can even have QFile *file as member variable, you just have to make sure it is completely set up correctly before using it in saveSettings().

Regards

GhostWolf

I tried some different options, and found a solution:


void MainWindow::saveSettings()
{
    name = (QCoreApplication::applicationDirPath() +"/logs/"+ui->lineEdit->text() +".txt");
       QFile file (name) ;
       if (newfile == true){
       if (file.exists()){
           qDebug ()<<"already exists";
           NewLog();
           timer->stop();

       } else {
           qDebug()<< "Does not exist";

           file.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append);
              QString c_time = QTime::currentTime().toString();
              QString sText =QString::number(update) + ". "+ c_time + ": rpm = "+ rpm + ", load = "+ QString::number(load) + ", "
                        + name1+ " = " + result1 + ", "+ name2+ " = " + result2 + ", "
                        + name3+ " = " + result3 + ", "+ name4+ " = " + result4 + ", "
                        + name5+ " = " + result5 + ", "+ name6+ " = " + result6 + ", "
                        + name7+ " = " + result7 + ", "+ name8+ " = " + result8 + ", "
                        + name9+ " = " + result9 + ", "+ name10+ " = " + result10;

               ui->label_log->setText(sText);

               update++;

               QTextStream out(&file);
               out << sText + "\n";
               file.close();

               newfile = false;

       }}else{
           file.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append);
              QString c_time = QTime::currentTime().toString();
              QString sText =QString::number(update) + ". "+ c_time + ": rpm = "+ rpm + ", load = "+ QString::number(load) + ", "
                        + name1+ " = " + result1 + ", "+ name2+ " = " + result2 + ", "
                        + name3+ " = " + result3 + ", "+ name4+ " = " + result4 + ", "
                        + name5+ " = " + result5 + ", "+ name6+ " = " + result6 + ", "
                        + name7+ " = " + result7 + ", "+ name8+ " = " + result8 + ", "
                        + name9+ " = " + result9 + ", "+ name10+ " = " + result10;

               ui->label_log->setText(sText);

               update++;

               QTextStream out(&file);
               out << sText + "\n";
               file.close();


}}

Maybe it can be easier, but i am still learning. Thanks for your input.
If you have comments on how to change my code, please tell me.
(newlog was only to test something else now)