Printing Unicode?

[auba]

I have some trouble to print Unicode characters with QPrinter and QPainter, especially Russian and Arabian.
To print out, I use nothing special:

bool TWinPrinter::printStr(TDeviceIO*, const QString& str) {
		QFontMetrics fm = m_Painter.fontMetrics();
		m_Painter.drawText(m_X, m_Y, str);
		m_X += fm.width(str);
		return TRUE;
	}

bool TWinPrinter::printStr(TDeviceIO*, const QString& str) {
		QFontMetrics fm = m_Painter.fontMetrics();
		m_Painter.drawText(m_X, m_Y, str);
		m_X += fm.width(str);
		return TRUE;
	}

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When I print ascii texts, it works - of course. But UTF16 chars are not printed. I also played around with setting a printer font, without success. Do I miss something? How can I print out unicode texts to a QPrinter?