Read/Write from QTextStream

[jacek]

The docs say:

QTextStream::QTextStream ( const QByteArray & array, QIODevice::OpenMode openMode = QIODevice::ReadOnly )
Constructs a QTextStream that operates on array, using openMode to define the open mode. The array is accessed as read-only, regardless of the values in openMode.

You have to use a different constructor to create an RW stream:

QString buffer( "test" );
QTextStream out( &buffer, QIODevice::ReadWrite );
out << "hello";
QString string;
out >> string; // == "testhello"

QString buffer( "test" );
QTextStream out( &buffer, QIODevice::ReadWrite );
out << "hello";
QString string;
out >> string; // == "testhello"

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If you just want to append a string use QString::operator+() or QString::append().