Tony and William,
My sincere thanks for your answer, it really helped me understand the issue
and saved my day :).
By the way here is the final code,
#include <QFile>
#include <QDataStream>
#include <QByteArray>
#include <QDebug>
int main()
{
QFile file("file.dat");
file.open(QIODevice::WriteOnly);
QByteArray bai;
{
// module A creates a byte array
QDataStream out(&bai, QIODevice::WriteOnly);
out << QString("A QString"); // writes some information on it
}
int len = bai.size();
file.write(reinterpret_cast<char *>(&len), sizeof(len));
file.write(bai);
// and module B starts
if (file.isOpen())
file.close();
file.open(QIODevice::ReadOnly);
QString str;
int a; // extracts size information
file.read(reinterpret_cast<char *>(&a), sizeof(a));
QDataStream in(file.read(a));
in >> str;
qDebug() << str << a; // output: "A QString" 22
return 0;
}
Sina.
2016-03-07 17:11 GMT+02:00 william.croc...@analog.com <
william.croc...@analog.com>:
> On 03/07/2016 09:35 AM, Sina Dogru wrote:
>
>> Well but, I am writing a QString to QByteArray,
>>
>> QByteArray bai;
>> QDataStream out(&bai, QIODevice::WriteOnly);
>> out << QString("A QString");
>>
>> And writing an 'int' and QByteArray which a QString written
>>
>> file.open(QIODevice::WriteOnly);
>> QDataStream out2(&file); // and module A write those datas to a file.
>> out2 << bai.size();
>> out2 << bai;
>>
>>
> All I care about is the QDataStream.
>
> You wrote the size() of QByteArray (which may or may not be an int)
> and then you read an int.
>
> You wrote a QByteArray and then you read a QString.
> I do not care what is in the QByteArray which you wrote.
>
> You should read back a QByteArray and then, in a subsequent
> operation, extract the QString from that.
>
>
> I might screwed totally? :S
>>
>>
_______________________________________________
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
