Strange binary file output when using QByteArray.

[schunyeh]

Hi, all,

I have a problem of QByteArry.
When I take it to store a data, a strange binary file is outputted.
A basic code is like as following.

QString fname ="test1.db";
QFile ext_file(fname);
ext_file.open(QIODevice::WriteOnly);
QDataStream out(&ext_file);
static const char mydata[] = { 0x74,0x68,0x65 };
QByteArray data = QByteArray::fromRawData(mydata,sizeof(mydata));
out<<data;

QString fname ="test1.db";
QFile ext_file(fname);
ext_file.open(QIODevice::WriteOnly);
QDataStream out(&ext_file);
static const char mydata[] = { 0x74,0x68,0x65 };
QByteArray data = QByteArray::fromRawData(mydata,sizeof(mydata));
out<<data;

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However, I got a strange extra data on the head of data stream.

0000 0003 7468 65

0000 0003 7468 65

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Why does the output data have 0000 0003 ?
Could you please help me.
Thank you very much.