[Qt-interest] how to achive the serialization in Qt

[Ramesh]

Thank you very much David,

I tried your sample.. it works well.. Thanks again

 

From: David Boosalis [mailto:david.boosalis at gmail.com] 
Sent: Tuesday, April 13, 2010 7:56 PM
To: Ramesh
Cc: qt-interest at trolltech.com; QtS60-feedback at trolltech.com
Subject: Re: [Qt-interest] how to achive the serialization in Qt

 

I do not tend to use serializers for Widgets but data, maybe this example
will be of help


class User: public QObject {
  Q_OBJECT
 public:
  typedef enum {InUse,NotInUse,Suspended,NeverUsed} UseType;
  User();
  User(const User &);
  ~User();
  QString firstName;
  QString lastName;
  int     id; //* database ID
  int     profileID;
  QString email;
  QString loginID;
  QString password;
  QDateTime lastAccess;
  QString phone;
  QString note;
  bool    enableLogin;
  bool   operator==( const User &s) const;    
  User   &operator= ( const User &rhs );
  void    *socket;
  QHostAddress  ipAddress;
  protected slots:
 protected:
  QUuid threadID; // used by servers
  //ConnectStatus connectStatus;
};
QDataStream &operator<<(QDataStream &ds,User &);
QDataStream &operator>>(QDataStream &ds,User &);


--------------------------- user.cpp follows:

...
QDataStream &operator<<(QDataStream &ds,User &s)
{
  
  ds << (qint32) s.id;
  ds << (qint32) s.profileID;
  ds << s.firstName;
  ds << s.lastName;
  ds << s.email;
  ds << s.loginID;
  ds << s.password;
  ds << s.lastAccess;
  ds << s.phone;
  ds << s.note;
  ds << s.ipAddress;
  return(ds);
}
QDataStream &operator>>(QDataStream &ds,User &s)
{
  qint32  i32;
  // quint16 ui16;
  QUuid threadID;
  QHostAddress ha;
  ds >> i32; 
  s.id = i32;
  ds >> i32;
  s.profileID = i32;
  ds >> s.firstName;
  ds >> s.lastName;
  ds >> s.email;
  ds >> s.loginID;
  ds >> s.password;
  ds >> s.lastAccess;
  ds >> s.phone;
  ds >> s.note;
  ds >> s.ipAddress;
  return(ds);
}


For convenience I also like to make serializers for my list class.

 class UserList : public QList<User *> {
 public:
  UserList();
  bool removeUserByID(int ID);
  User *findByID(int id);
  User *findByLoginID(QString &id);
  User *findByLoginID(char *);
  User *validateUser(const QString &userName,const QString &password); 
};

QDataStream &operator<<(QDataStream &ds,UserList &);
QDataStream &operator>>(QDataStream &ds,UserList &);
...
/********************************************************************/
QDataStream &operator << (QDataStream &ds,UserList &sl)
{
  qint32  i32;
  User *s;
  i32 = sl.count();
  ds << i32;
  QListIterator<User *> iter(sl);
  while(iter.hasNext()) {
    s = iter.next();
    ds << *s;
  }
  return(ds);
}
/********************************************************************/
QDataStream &operator >> (QDataStream &ds,UserList &sl)
{
  User *s;
  int i;
  qint32  i32;
  ds >> i32;
  // qDebug() << __FILE__ << "read in this many users: " << i32;
  if (i32 < 1) {
    return(ds);
  }
  for (i=0;i<i32;i++) {
    s = new User();
    ds >> *s;
    sl.append(s);
  }
  return(ds);
}










On Tue, Apr 13, 2010 at 6:07 AM, Ramesh <ramesh.bs at robosoftin.com> wrote:

Hi,

 

Folks, can you help me in how to achieve the serialization in Qt,

 

I have some idea about QDataStream with this we can achieve the data stream,

In the documentation it is mentioned that we can write char, int, etc the
other  Data types, if I try to write the object it is throwing error L

 

How to write the object to file using QDataStream?

 

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