QDataStream and QByteArray issue

[sepehr]

after spending hours(!) and thanks to you guys I got what to do,taking a peek to my previous post when I noticed the size inconsistency I tried to encode the str2Store using str2Store.toHex();
and then saved it into database and used the static method QByteArray::fromHex(str2recover);
and decoded it and saved it in a QImage and it just works like a charm now

I'm attaching the final code

[magilda]

Hello to everybody,

hoping to be helpful and to learn from everybody.

m.

---

Added after 1 20 minutes:

Thanks for your code,
I send you my revised version for POstgresql

inserting :

void lbytea()
{
QByteArray qba;

QImage pix("/home/pgsql/loaddir/motrice_30.png","PNG");
QBuffer buffer(&qba);
buffer.open(QIODevice::WriteOnly);
pix.save(&buffer,"PNG");
QSqlQuery insertPicCom;
insertPicCom.prepare("insert into pix (sch,pixyb) values(:sch,ixyb)");
qba=qba.toHex();
insertPicCom.bindValue(":sch","PIPPO");
insertPicCom.bindValue("ixyb",qba);
insertPicCom.exec();
}

retriving


qstrpix="select anf_pixyb from anf_flotta where anf_idmezzo = ...
QSqlQuery qpix(qstrpix);
if (qpix.next()) {
qba = qpix.value(0).toByteArray();
qba=QByteArray::fromHex(qba);
QPixmap dixy;
dixy.loadFromData ( qba);
qwh->setIcon(QIcon(dixy));
}

m.

[alokraj001]

QByteArray data = QByteArray::fromHex("200000008305370FFFFFF63050000 8E");
QDataStream dataStreamToReadFrom(&data, QIODevice::ReadOnly);
QByteArray convertedData;
dataStreamToReadFrom >> convertedData;

QString Str = data.toHex();
QString convertedStr = convertedData.toHex();

Here Str and convertedStr are not same. Why?

I want to both QByteArray data and converted Data to be the same. How to achieve that.?

[d_stranz]

Do not double post. Make one post, in one section of the forum only, and it will be read.

[harmonyclexx]

CAN SOMEONE HELP ME!!? im using linux ubuntu
Im getting this error
fatal error: QTextStream: No such file or directory

#include "QTextStream"
#include <QDebug>
QTextStream cin(stdin);
QTextStream cout(stdout);
QTextStream cerr(stderr);
int main() {
int num1(1234), num2(2345) ;
cout << oct << num2 << '\t'
<< hex << num2 << '\t'
<< dec << num2
<< endl;
double dub(1357);
cout << dub << '\t'
<< forcesign << dub << '\t'
<< forcepoint << dub
<< endl;
dub = 1234.5678;
cout << dub << '\t'
<< fixed << dub << '\t'
<< scientific << dub << '\n'
<< noforcesign << dub
<< endl;
qDebug() << "Here is a debug message with " << dub << "in it." ;
qDebug("Here is one with the number %d in it.", num1 );
}

#include "QTextStream"
#include <QDebug>
QTextStream cin(stdin);
QTextStream cout(stdout);
QTextStream cerr(stderr);
int main() {
int num1(1234), num2(2345) ;
cout << oct << num2 << '\t'
<< hex << num2 << '\t'
<< dec << num2
<< endl;
double dub(1357);
cout << dub << '\t'
<< forcesign << dub << '\t'
<< forcepoint << dub
<< endl;
dub = 1234.5678;
cout << dub << '\t'
<< fixed << dub << '\t'
<< scientific << dub << '\n'
<< noforcesign << dub
<< endl;
qDebug() << "Here is a debug message with " << dub << "in it." ;
qDebug("Here is one with the number %d in it.", num1 );
}

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[d_stranz]

Use <QTextStream> not "QTextStream". #include with quotes only looks in the local directory.

Please do not hijack a thread to make an unrelated post. Start a new thread.