Sérialization, QVariant et QSettings : unable*to*load*type 257

[archfiend]

Hello

I experience issues when running my application

I have personnal object (ChannelObjectSerializable) which I want to save status.

Here is part of the code which will help :

After the sync() :

QVariant::load: unable to load type 257. 
QVariant::save: unable to save type 257. 
QVariant::load: unable to load type 257. 
##################### 
# Channel : 
# # 
# # 
# # 
# # 
# # 
#####################

QVariant::load: unable to load type 257. 
QVariant::save: unable to save type 257. 
QVariant::load: unable to load type 257. 
##################### 
# Channel : 
# # 
# # 
# # 
# # 
# # 
#####################

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Avec :

ChannelObjectSerilizable.h

private: 
friend QDataStream & operator << (QDataStream &, const ChannelObjectSerializable &); 
friend QDataStream & operator >> (QDataStream &, ChannelObjectSerializable &); 
}; 
 
Q_DECLARE_METATYPE(ChannelObjectSerializable) 
QDataStream & operator << (QDataStream & out, const ChannelObjectSerializable & Valeur); 
QDataStream & operator >> (QDataStream & in, ChannelObjectSerializable & Valeur);

private: 
friend QDataStream & operator << (QDataStream &, const ChannelObjectSerializable &); 
friend QDataStream & operator >> (QDataStream &, ChannelObjectSerializable &); 
}; 

Q_DECLARE_METATYPE(ChannelObjectSerializable) 
QDataStream & operator << (QDataStream & out, const ChannelObjectSerializable & Valeur); 
QDataStream & operator >> (QDataStream & in, ChannelObjectSerializable & Valeur);

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ChannelObjectSerializable.cpp :

void ChannelObjectSerializable::initChannelSystem() 
{ 
qRegisterMetaTypeStreamOperators("ChannelObject"); 
qMetaTypeId(); 
} 
 
QDataStream & operator<<(QDataStream & out, const ChannelObjectSerializable & Valeur) 
{ 
QString tmp; 
out << tmp.fromStdString(Valeur.nom) 
<< tmp.fromStdString(Valeur.lastUpdate) 
<< tmp.fromStdString(Valeur.description) 
<< tmp.fromStdString(Valeur.lien) 
<< tmp.fromStdString(Valeur.link); 
 
return out; 
} 
 
QDataStream & operator>>(QDataStream & in, ChannelObjectSerializable & Valeur) 
{ 
QString tmp; 
in >> tmp; 
Valeur.nom = tmp.toStdString(); 
in >> tmp; 
Valeur.lastUpdate = tmp.toStdString(); 
in >> tmp; 
Valeur.description = tmp.toStdString(); 
in >> tmp; 
Valeur.lien = tmp.toStdString(); 
in >> tmp; 
Valeur.link = tmp.toStdString(); 
 
return in; 
}

void ChannelObjectSerializable::initChannelSystem() 
{ 
qRegisterMetaTypeStreamOperators("ChannelObject"); 
qMetaTypeId(); 
} 

QDataStream & operator<<(QDataStream & out, const ChannelObjectSerializable & Valeur) 
{ 
QString tmp; 
out << tmp.fromStdString(Valeur.nom) 
<< tmp.fromStdString(Valeur.lastUpdate) 
<< tmp.fromStdString(Valeur.description) 
<< tmp.fromStdString(Valeur.lien) 
<< tmp.fromStdString(Valeur.link); 

return out; 
} 

QDataStream & operator>>(QDataStream & in, ChannelObjectSerializable & Valeur) 
{ 
QString tmp; 
in >> tmp; 
Valeur.nom = tmp.toStdString(); 
in >> tmp; 
Valeur.lastUpdate = tmp.toStdString(); 
in >> tmp; 
Valeur.description = tmp.toStdString(); 
in >> tmp; 
Valeur.lien = tmp.toStdString(); 
in >> tmp; 
Valeur.link = tmp.toStdString(); 

return in; 
}

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main.cpp

ChannelObjectSerializable p = ChannelObjectSerializable(newRSS); 
p.initChannelSystem(); 
QSettings fichier_ecrire("Test.ini", QSettings::IniFormat); 
fichier_ecrire.setValue("channel", qVariantFromValue(p)); 
p.printDonnees(); 
fichier_ecrire.sync(); 
 
ChannelObjectSerializable copie; 
QSettings fichier_lire("Test.ini", QSettings::IniFormat); 
copie = fichier_lire.value("channel", qVariantFromValue(ChannelObjectSerializable())).value(); 
copie.printDonnees();

ChannelObjectSerializable p = ChannelObjectSerializable(newRSS); 
p.initChannelSystem(); 
QSettings fichier_ecrire("Test.ini", QSettings::IniFormat); 
fichier_ecrire.setValue("channel", qVariantFromValue(p)); 
p.printDonnees(); 
fichier_ecrire.sync(); 

ChannelObjectSerializable copie; 
QSettings fichier_lire("Test.ini", QSettings::IniFormat); 
copie = fichier_lire.value("channel", qVariantFromValue(ChannelObjectSerializable())).value(); 
copie.printDonnees();

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After loading the object, it's empty

[archfiend]

Solved, here is the solution :

http://www.siteduzero.com/forum-83-4...qsettings.html