can`t read a binary data!

[blm]

What error cause does QFile::errorString() give?
(On linux: make sure you have read permissions and, of course, that the path to the file is correct.)

i have tested,

if (file.open(QIODevice::Readonly))
{
    QDataSteam in(&file);
    QString inin;
    in >> inin;
    textEdit->setPlainText(inin);
}
 
else
    cerr<<file.error();
    QMessageBox::informaion(this, tr("OktoberFest"), tr("drink beer"), QMessageBox::ok);

if (file.open(QIODevice::Readonly))
{
    QDataSteam in(&file);
    QString inin;
    in >> inin;
    textEdit->setPlainText(inin);
}

else
    cerr<<file.error();
    QMessageBox::informaion(this, tr("OktoberFest"), tr("drink beer"), QMessageBox::ok);

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the feedback is 5, that means The file could not be opened.

but actually i can open it use Textpad