Progressbar problem

[thae]

I have a function

void ex
{
	long num = 100000;
	for(int i=0;i<num;i++)
	{
		// do something
	}
}

void ex
{
	long num = 100000;
	for(int i=0;i<num;i++)
	{
		// do something
	}
}

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In the mainWindow when I call this function
I want to have a progress bar that indicates this function is running

I've used these code

void ex()
{
    long RowCount = 60000;
    QProgressDialog progress(this);
    progress.setLabelText("ProgressBar");
    progress.setRange(0, RowCount);
    progress.setModal(true);
    progress.show();
	for (long row = 0; row < RowCount; ++row) {
        progress.setValue(row);
        qApp->processEvents();
        if (progress.wasCanceled()) {
        }
    }
}

void ex()
{
    long RowCount = 60000;
    QProgressDialog progress(this);
    progress.setLabelText("ProgressBar");
    progress.setRange(0, RowCount);
    progress.setModal(true);
    progress.show();
	for (long row = 0; row < RowCount; ++row) {
        progress.setValue(row);
        qApp->processEvents();
        if (progress.wasCanceled()) {
        }
    }
}

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But the progress bar isn't running except it's increasing percentage
( it shows up but not progressing )

can't you help me !

thanks in advance !