How to save this blob data into database?

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QT

QT-Creator

How to save this blob data into database?? I am reading the jpeg image in Qbytearray; But while saving to database, the image size is doubled and while retrieving from database, the file is being corrupted. How to read the image properly??

QByteArray buf=NULL;
originalPixmap =QPixmap();
originalPixmap = QPixmap::grabWindow(QApplication::desktop()->winId());
QString strfname;
strfname.sprintf("%d",c);
originalPixmap.save("C:\\Program Files\\image"+strfname+".jpeg","jpeg");
c++;
char Data;
QFile file("C:\\Program Files\\image"+strfname+".jpeg");
file.open(QIODevice::ReadOnly);
int len=file.size();
//buf=file.read(len);
buf=file.readAll();
file.close();
file.remove();
QSqlQuery query;
query.exec("INSERT INTO log (grab_date, ip_address, image,logged_user) "
"VALUES (?,?,?,?)");
query.bindValue(0,dd);
query.bindValue(1,address);
query.bindValue(2,buf.toBase64());
query.bindValue (3,hostname);
bool qry=query.exec();