QTextStream/QIODevice issue.

Hello there, I'm asking for help here once again.

I have such function:

Code:

void QuestCreator::onSaveQuestClicked()
{
	if(ui->FileNameEdit->text() == "" || ui->SavePathEdit->text() == "")
	{
		QMessageBox::critical(this, "Quest Creator", "Couldn't save quest, file name or save path is empty.");
		return;
	}
 
	QTextStream quest("", QIODevice::ReadWrite | QIODevice::Text);
	quest << "local items = {";
 
	for(int i = 0; i < ui->ItemsList->columnCount(); i++)
	{
		QTreeWidgetItem *item = ui->ItemsList->takeTopLevelItem(i);
		if(item != NULL)
		{
			quest << "\t\t[" << QString::number(i) << "] = {" << item->text(0) << ", " << item->text(1) << "},";
			ui->ItemsList->addTopLevelItem(item); // I don't know why, but when I call takeTopLevelItem(int) function then element is being removed from list, that's why I add it back to list here.
		}
	}
 
	quest << "}";
	quest << "\nfunction onUse(cid, item, fromPosition, itemEx, toPosition)";
	quest << "\n\tif getCreatureStorage(cid, " << ui->StorageKeyEdit->text() << ") > -1) then";
	quest << "\n\t\tdoPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, \"" << ui->FailureMessageEdit->text() << "\")";
	quest << "\n\t\treturn true";
	quest << "\n\tend";
	quest << "\n";
 
	if(ui->ItemsInContainer->isChecked())
		quest << "\n\tlocal container = doPlayerAddItem(cid, " << ui->ContainerIDEdit << ", 1)";
 
	quest << "\n\tfor _, item in ipairs(items) do";
	if(ui->ItemsInContainer->isChecked())
		quest << "doAddContainerItem(container, item[1], item[2])";
	else
		quest << "doPlayerAddItem(cid, item[1], item[2])";
 
	quest << "\n\tend";
	quest << "\n\tdoPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, \"\")";
	quest << "\n\tdoCreatureSetStorage(cid, " << ui->StorageKeyEdit->text() << ", 1)";
	quest << "\n\treturn true";
	quest << "\nend";
 
	if(!ui->FileNameEdit->text().contains(".lua"))
		ui->FileNameEdit->setText(ui->FileNameEdit->text() + ".lua");
 
	QFile questFile(ui->SavePathEdit->text() + "\\" + ui->FileNameEdit->text());
	if(!questFile.exists())
	{
		if(questFile.open(QIODevice::WriteOnly | QIODevice::Text))
		{
			questFile.write(quest.string()->toUtf8(), quest.string()->length());
			questFile.close();
			QMessageBox::information(this, "Quest Creator", "Quest has been saved.");
		}
		else
			QMessageBox::critical(this, "Quest Creator", "Couldn't save quest, failed to open file.");
	}
	else
		QMessageBox::critical(this, "Quest Creator", "Couldn't save quest, file already exists.");
}

When I initialize QTextStream without paremeters, I'm getting errors about not set QIODevice, when I tried to add device (as you can see in constructor) I've started to get Segmentation Fault. I've debuged code line by line and the problem is here:

Code:

questFile.write(quest.string()->toUtf8(), quest.string()->length());

Could anyone show me some steps how do I fix this problem?

@Edit:
Well, nevermind. Solved it on my own, just added QString result; and changed QTextStream quest constructor to QTextStream quest(&result) then used result variable while writing to file.