emit make process more slowly ?

I want have indicator for my process. So i use a signal for update the progressbar value

Code:

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//header MakanPakeSambal
signals:
	updateProgress(qint64, qint64);

---

Code:

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//code MakanPakeSambal
qDebug() << "Start : " << QTime::currentTime().toString("h:m:s");
qint64 ukuran=_inFileinfo.size();
qint64 i=0;
while(_inFile.getChar(&c))
    {
        outFile.putChar(c);
        emit updateProgress(ukuran, i);
        i++;
    }
qDebug() << "End : " << QTime::currentTime().toString("h:m:s");

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And I use like this

Code:

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Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
 
    mps=new MakanPakeSambal();
    connect(mps, SIGNAL(updateProgress(qint64,qint64)), this, SLOT(load(qint64, qint64)));
}
 
void Dialog::load(qint64 max, qint64 curr)
{
    ui->load->setMaximum(max);
    ui->load->setValue(curr);
}

---

This is qDebug result without emit signal

Start : "18:3:28"
End : "18:3:42"

And with emit signal

Start : "18:4:20"
End : "18:12:15"

My method for get the progress value is wrong ?

You have a busy loop which blocks event processing. When you exit the loop you probably get a flood of updates of the ui->load object.

How big is input file ? Remember that every signal cause redrawing progress bar. Try this :
1. Create two signals. One for setting max value and one for stepping.
This first emit only one time.

2. Copy file with blocks not with single character.

Quote:

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Originally Posted by Lesiok

How big is input file ? Remember that every signal cause redrawing progress bar. Try this :
1. Create two signals. One for setting max value and one for stepping.
This first emit only one time.

2. Copy file with blocks not with single character.

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1. Still slow

2. How to copy file with blocks ? Can you help me for show sample code ?