Convery QByteArray to QVariantMap

[karankumar1609]

Hello All,,


I have converted the QVariantMap (http://qt-project.org/doc/qt-4.8/qvariant.html)to QByteArray (http://qt-project.org/doc/qt-4.8/qbytearray.html) via:


QByteArray parameters;
foreach( QVariant variant, values )
parameters.append( variant.toChar() );


But i want to convert it back in QVariantMap.

Any idea about converting QByteArray (http://qt-project.org/doc/qt-4.8/qbytearray.html) to QVariantMap (http://qt-project.org/doc/qt-4.8/qvariant.html)

[ChrisW67]

You can't recover the original QVariantMap... you have thrown away the QString keys from the map, and any QVariant value that was not convertable to QChar, and the original type (char, int or unit) of the QVariants that could be converted to char.

You probably should consider using QDataStream to serialise/deserialise into a buffer.

[karankumar1609]

Works for me:
I USE


QByteArray parameters;
QDataStream *stream = new QDataStream(&parameters, QIODevice::WriteOnly);

(*stream) << values;
delete stream;
stream = NULL;

[ChrisW67]

This will only work if you used QDataStream to serialise the QVariantMap in the first place.

There's no need to allocate the QDataStream on the heap at line 2. The syntax at line 4 is simplified, and lines 5 and 6 become unnecessary.