QTextStream operator>> and error detection

[olidem]

Hi!
I'm parsing integers from a QTextStream:

textstream >> x >> y ;

How can I check everything for correctness?

if( ! (textstream >> x >> y)) 
{
//...
}

if( ! (textstream >> x >> y)) 
{
//...
}

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does not work.

Thanks in Advance
Olli