How to register a custom complex type about qtjsonserializer HOT 6 CLOSED

I am not shure where you went wrong, because your declarations at least include the correct declarations. The only ones you need are a list converter for the SaleProperty followed by a map converter for a list of those:

QJsonSerializer::registerListConverters<SaleProperty*>();
QJsonSerializer::registerMapConverters<QList<SaleProperty*>>();

qRegisterMetaType is not needed, as QMap and QList are already declared for any type, you only need a Q_DECLARE_METATYPE(SaleProperty*) In the header.

The libraries uses exceptions, so to find out what exactly goes wrong, you should try to catch and print them. The "quick and dirty" way is to just do so in the main:

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    try {
        // <Your code>
        return a.exec();
    } catch (QJsonSerializerException &e) {
        qCritical("%s", e.what());
        return 1;
    }
}

I created a basic demo project to check if there was actually some error in the library, but my test project worked as expected. I attached it so you can compare it with your code: jserissue.zip

from qtjsonserializer.

Hello,
qRegisterMetaType<SaleProperty*>("SaleProperty*");
Before using it.

Hope this will help,
Good luck!

from qtjsonserializer.

I am not shure where you went wrong, because your declarations at least include the correct declarations. The only ones you need are a list converter for the SaleProperty followed by a map converter for a list of those:

QJsonSerializer::registerListConverters<SaleProperty*>();
QJsonSerializer::registerMapConverters<QList<SaleProperty*>>();

qRegisterMetaType is not needed, as QMap and QList are already declared for any type, you only need a Q_DECLARE_METATYPE(SaleProperty*) In the header.

The libraries uses exceptions, so to find out what exactly goes wrong, you should try to catch and print them. The "quick and dirty" way is to just do so in the main:

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    try {
        // <Your code>
        return a.exec();
    } catch (QJsonSerializerException &e) {
        qCritical("%s", e.what());
        return 1;
    }
}

I created a basic demo project to check if there was actually some error in the library, but my test project worked as expected. I attached it so you can compare it with your code: jserissue.zip

Thanks a lot.
I checked my code again, and found that i was using Q_DECLARE_METATYPE(SaleProperty) in my header file, and when i changed it to Q_DECLARE_METATYPE(SaleProperty*), everything went well.

i do not usually use these advance macro, at first, i considered that pointer dose not seem to need specially declare after i read the README.md document. so i think, because of qt do not recognize self-define class so i use Q_DECLARE_METATYPE(SaleProperty) in my header file. is there anything i understand wrong?

is there anything i understand wrong?

from qtjsonserializer.

Hello,
qRegisterMetaType<SaleProperty*>("SaleProperty*");
Before using it.

Hope this will help,
Good luck!

thank you for your help, and i also solved my problem, good luck

from qtjsonserializer.

Q_DECLARE_METATYPE(SaleProperty) is wrong in this context, if SaleProperty is a Q_OBJECT.

The rule is:

• Class extends QObject and has the Q_OBJECT macro -> Use Q_DECLARE_METATYPE(MyClass*)
• Class is a normal, value type class/struct and has the Q_GADGET macro -> use Q_DECLARE_METATYPE(MyClass)
• Generally speaking, register the type in the way you use it in your code

Whether registering is required or not often depends on the context and usage, and at least for this very basic example, it would not be strictly neccessary, but it's always good to use those macros anyway, as having them is always only beneficial.

I will close this issue know, but if you have further questions regarding this specific case, you can still reply to it.

from qtjsonserializer.

Q_DECLARE_METATYPE(SaleProperty) is wrong in this context, if SaleProperty is a Q_OBJECT.

The rule is:

• Class extends QObject and has the Q_OBJECT macro -> Use Q_DECLARE_METATYPE(MyClass*)
• Class is a normal, value type class/struct and has the Q_GADGET macro -> use Q_DECLARE_METATYPE(MyClass)
• Generally speaking, register the type in the way you use it in your code

Whether registering is required or not often depends on the context and usage, and at least for this very basic example, it would not be strictly neccessary, but it's always good to use those macros anyway, as having them is always only beneficial.

I will close this issue know, but if you have further questions regarding this specific case, you can still reply to it.

Thanks again, I've learned a lot from your help. Have a nice day

from qtjsonserializer.