Binary QFile error

[Affenbrotbaum]

Hey Community,

I am running the following piece of code on a Windows 7 machine and the output seems really strange. I get a string length of 0 back.
Am I missing something?

Thanks a lot
Alex

// Save the file
QFile fileOne("test.file");
    fileOne.open(QIODevice::WriteOnly);
    QDataStream out(&fileOne);
    out.setVersion(QDataStream::Qt_4_6);
    out << "Test";
    fileOne.close();
 
//load from it
    QFile file("test.file");
    file.open(QIODevice::ReadOnly);
    QDataStream in(&file);
    QString str;
    in.setVersion(QDataStream::Qt_4_6);
    in >> str ;
 
    QString strLength;
    strLength.setNum(str.length());
 
    QMessageBox::information(0,"Output",str);
    QMessageBox::information(0,"Output",strLength);
    file.close();

// Save the file
QFile fileOne("test.file");
    fileOne.open(QIODevice::WriteOnly);
    QDataStream out(&fileOne);
    out.setVersion(QDataStream::Qt_4_6);
    out << "Test";
    fileOne.close();

//load from it
    QFile file("test.file");
    file.open(QIODevice::ReadOnly);
    QDataStream in(&file);
    QString str;
    in.setVersion(QDataStream::Qt_4_6);
    in >> str ;

    QString strLength;
    strLength.setNum(str.length());

    QMessageBox::information(0,"Output",str);
    QMessageBox::information(0,"Output",strLength);
    file.close();

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[schnitzel]

from the documentation for QDataStream:

Each item written to the stream is written in a predefined binary format that varies depending on the item's type. Supported Qt types include QBrush, QColor, QDateTime, QFont, QPixmap, QString, QVariant and many others. For the complete list of all Qt types supporting data streaming see the Format of the QDataStream operators.

you are reading it out as a QString, so you must also write it in as a QString

you need to change:
out << "test"
to
out << QString("test")

[boudie]

Try:

out << QString("Test");

out << QString("Test");

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/edit:
I was too slow...

[Affenbrotbaum]

Argh.. could've seen that one myself.

Thanks you two...