QIODEvice

[mickey]

hi, i'm trying to use qiodevice to do this....

QFile f(file);
bool b = f.open(IO_ReadOnly);
bool read_result = Read(f);

QFile f(file);
bool b = f.open(IO_ReadOnly);
bool read_result = Read(f);

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bool Read(QIODevice& io) {
  QDomDocument doc;
  QString s = doc.toString(); //  this cause runtime error
//   cout << " s " << s << endl;
   if ( !doc.setContent( &io ) )    return false; //here program exit

bool Read(QIODevice& io) {
  QDomDocument doc;
  QString s = doc.toString(); //  this cause runtime error
//   cout << " s " << s << endl;
   if ( !doc.setContent( &io ) )    return false; //here program exit

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Why this fragment has that behavoiur? (which cause) thanks