QDataStream and QDebug

hi
please point the error in the following code

Code:

---

QDataStream stream;
stream<<(qint32)12345;
qint32 i;
stream>>i;
qDebug()<<i<<" i";

---

the output is

Code:

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0  i

---

i expect the output to be 12345.

You have no QIODevice set.
You should see a warning in the debug output about this/: "QDataStream: No device".

The data stream must be created with a QIODevice either by passing it in the constructor or via setDevice.

thanks marcel

but even after constructing a QDataStream that operates on QByteArray i am getting the same output

heres the code

Code:

---

QByteArray ar;
		QDataStream stream(&ar, QIODevice::ReadWrite);
		stream<<(qint32)12345;
		qint32 i;
		stream>>i;
		qDebug()<<i<<" i";

---

the output is

Code:

---

0  i

---

It's a stream. Streams don't work like that. You will have to seek the underlying device to beginning, just like in this other thread of yours.

thanks jpn

it worked after using this statement

Code:

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stream.device()->seek(0);

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how to copy one QDataStream to another QDataStream.