How to register pointer type in qScriptRegisterMetatype?

[Sacha_D]

Hello.

How to register pointer type in qScriptRegisterMetatype?

h-file.

namespace PFT3 {
 
class TaskEngine : public QObject {
Q_OBJECT
public:
static const char * TaskEngine::nameInScript;
static const char * TaskEngine::scriptTasksNamespaceName;
void createInQScriptEngine(QScriptEngine &scriptEngine);
};
 
namespace PFT3_Tasks {
 
class LIBPFT3SHARED_EXPORT BaseData : public QObject {
        Q_OBJECT
};
 
class BaseDataScriptProto : public QObject, protected QScriptable {
        Q_OBJECT
};
 
}// end of namespace PFT3_Tasks 
 
}//end of PFT3 namespace
 
Q_DECLARE_METATYPE(PFT3::PFT3_Tasks::BaseData)
Q_DECLARE_METATYPE(PFT3::PFT3_Tasks::BaseData*)
Q_DECLARE_METATYPE(const PFT3::PFT3_Tasks::BaseData*)

namespace PFT3 {

class TaskEngine : public QObject {
Q_OBJECT
public:
static const char * TaskEngine::nameInScript;
static const char * TaskEngine::scriptTasksNamespaceName;
void createInQScriptEngine(QScriptEngine &scriptEngine);
};

namespace PFT3_Tasks {

class LIBPFT3SHARED_EXPORT BaseData : public QObject {
        Q_OBJECT
};

class BaseDataScriptProto : public QObject, protected QScriptable {
        Q_OBJECT
};

}// end of namespace PFT3_Tasks 

}//end of PFT3 namespace

Q_DECLARE_METATYPE(PFT3::PFT3_Tasks::BaseData)
Q_DECLARE_METATYPE(PFT3::PFT3_Tasks::BaseData*)
Q_DECLARE_METATYPE(const PFT3::PFT3_Tasks::BaseData*)

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cpp-file

QScriptValue PFT3TaskBaseDataToScriptValue(QScriptEngine *engine, PFT3::PFT3_Tasks::BaseData * const &in){
    return engine->newQObject(in, QScriptEngine::AutoOwnership);
}
 
void PFT3TaskBaseDataFromScriptValue(const QScriptValue &object, PFT3::PFT3_Tasks::BaseData * &out){
    out = qobject_cast<PFT3::PFT3_Tasks::BaseData*>(object.toQObject());
}
 
namespace PFT3 {
 
const char * TaskEngine::nameInScript = "pft3TaskEngine";
const char * TaskEngine::scriptTasksNamespaceName = "PFT3_Tasks";//Changing this name doesn't changes 'PFT3_Tasks::BaseData*' string in error. This is only coincidence.
 
void TaskEngine::createInQScriptEngine(QScriptEngine &scriptEngine){
    /*Create single for given scriptEngine TaskEngine*/
    QScriptValue scriptTaskEngineObject = scriptEngine.newQObject(this);
    scriptEngine.globalObject().setProperty(nameInScript, scriptTaskEngineObject);
    /*Adding prototypes*/
    QScriptValue scriptTasksNamespace = scriptEngine.newQObject(new QObject(), QScriptEngine::ScriptOwnership);
    scriptEngine.globalObject().setProperty(scriptTasksNamespaceName, scriptTasksNamespace);
    /*BaseData*/
    PFT3_Tasks::BaseDataScriptProto *baseDataPrototypeObject = new PFT3_Tasks::BaseDataScriptProto (&scriptEngine);
    const QScriptValue baseDataProto = scriptEngine.newQObject(baseDataPrototypeObject, QScriptEngine::ScriptOwnership);
    scriptEngine.setDefaultPrototype(qMetaTypeId<PFT3::PFT3_Tasks::BaseData>(), baseDataProto);
    QScriptValue baseDataCtor = scriptEngine.newFunction(&PFT3_Tasks::BaseData::construct, baseDataProto);
    scriptEngine.globalObject().property(scriptTasksNamespaceName).setProperty("BaseData", baseDataCtor);
 
    /*-------------------------------------------------------------------------------------------------------*/
    qScriptRegisterMetaType(&scriptEngine, PFT3TaskBaseDataToScriptValue, PFT3TaskBaseDataFromScriptValue);//I register it here.
    /*-------------------------------------------------------------------------------------------------------*/
 
}
 
}// end of namespace PFT3

QScriptValue PFT3TaskBaseDataToScriptValue(QScriptEngine *engine, PFT3::PFT3_Tasks::BaseData * const &in){
    return engine->newQObject(in, QScriptEngine::AutoOwnership);
}

void PFT3TaskBaseDataFromScriptValue(const QScriptValue &object, PFT3::PFT3_Tasks::BaseData * &out){
    out = qobject_cast<PFT3::PFT3_Tasks::BaseData*>(object.toQObject());
}

namespace PFT3 {

const char * TaskEngine::nameInScript = "pft3TaskEngine";
const char * TaskEngine::scriptTasksNamespaceName = "PFT3_Tasks";//Changing this name doesn't changes 'PFT3_Tasks::BaseData*' string in error. This is only coincidence.

void TaskEngine::createInQScriptEngine(QScriptEngine &scriptEngine){
    /*Create single for given scriptEngine TaskEngine*/
    QScriptValue scriptTaskEngineObject = scriptEngine.newQObject(this);
    scriptEngine.globalObject().setProperty(nameInScript, scriptTaskEngineObject);
    /*Adding prototypes*/
    QScriptValue scriptTasksNamespace = scriptEngine.newQObject(new QObject(), QScriptEngine::ScriptOwnership);
    scriptEngine.globalObject().setProperty(scriptTasksNamespaceName, scriptTasksNamespace);
    /*BaseData*/
    PFT3_Tasks::BaseDataScriptProto *baseDataPrototypeObject = new PFT3_Tasks::BaseDataScriptProto (&scriptEngine);
    const QScriptValue baseDataProto = scriptEngine.newQObject(baseDataPrototypeObject, QScriptEngine::ScriptOwnership);
    scriptEngine.setDefaultPrototype(qMetaTypeId<PFT3::PFT3_Tasks::BaseData>(), baseDataProto);
    QScriptValue baseDataCtor = scriptEngine.newFunction(&PFT3_Tasks::BaseData::construct, baseDataProto);
    scriptEngine.globalObject().property(scriptTasksNamespaceName).setProperty("BaseData", baseDataCtor);

    /*-------------------------------------------------------------------------------------------------------*/
    qScriptRegisterMetaType(&scriptEngine, PFT3TaskBaseDataToScriptValue, PFT3TaskBaseDataFromScriptValue);//I register it here.
    /*-------------------------------------------------------------------------------------------------------*/
   
}

}// end of namespace PFT3

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Then I write on QtScript:

//delete task;
var task = new PFT3_Tasks.BaseData(1, 2, 6000, 2000, true);
pft3TaskEngine.appendTask(task);

//delete task;
var task = new PFT3_Tasks.BaseData(1, 2, 6000, 2000, true);
pft3TaskEngine.appendTask(task);

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And get script exception,that I parse to output:

Error in script caused the exception:
"TypeError: cannot call appendTask(): argument 1 has unknown type `PFT3_Tasks::BaseData*' (register the type with qScriptRegisterMetaType())"
at executing line 3.
Call stack:
1. <anonymous>()@Script, entered by user:3

http://lists.qt.nokia.com/public/qt-...ry/002051.html I read and tried with typedef.
Making Applications Scriptable I read too and many times.
How to do this correctly?
Thank you for your replies.

[anda_skoa]

Couple of points:

1) I would use QScriptEngine::newObject() instead of newQObject() for the namespace

2) I would not use a QObject subclass for the data entry if possible, only the prototype has to be. You can then pass BaseData as value and const reference

3) Since you are using a prototype, you don't need conversion functions and you don't need to call qScriptRegisterMetaType()

You basically do something like this

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3::PFT3_Tasks::BaseData*");
QScriptValue prototype = engine->newQObject(new PFT3_Tasks::BaseDataScriptProto(engine));
engine->setDefaultPrototype(typeId, prototype);
engine->setDefaultPrototype(qMetaTypeId<PFT3::PFT3_Tasks::BaseData>(), prototype);
 
QScriptValue namespaceObj = engine->newObject();
engine->globalObject().setProperty("PFT3_Tasks", namespaceObj);
 
QScriptValue creator = engine->newFunction(createData, prototype);
namespaceObj.setProperty("BaseData", creator);

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3::PFT3_Tasks::BaseData*");
QScriptValue prototype = engine->newQObject(new PFT3_Tasks::BaseDataScriptProto(engine));
engine->setDefaultPrototype(typeId, prototype);
engine->setDefaultPrototype(qMetaTypeId<PFT3::PFT3_Tasks::BaseData>(), prototype);

QScriptValue namespaceObj = engine->newObject();
engine->globalObject().setProperty("PFT3_Tasks", namespaceObj);

QScriptValue creator = engine->newFunction(createData, prototype);
namespaceObj.setProperty("BaseData", creator);

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In functions of the prototype class you then access the data objects like this

qscriptvalue_cast<BaseData*>(thisObject());

qscriptvalue_cast<BaseData*>(thisObject());

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The constructor function would look like this

QScriptValue createData(QScriptContext *context, QScriptEngine *engine)
{
    if (context->isCalledAsConstructor()) {
        BaseData *data = new BaseData;
        return engine->toScriptValue(data);
    } else {
        return engine->undefinedValue();
    }
}

QScriptValue createData(QScriptContext *context, QScriptEngine *engine)
{
    if (context->isCalledAsConstructor()) {
        BaseData *data = new BaseData;
        return engine->toScriptValue(data);
    } else {
        return engine->undefinedValue();
    }
}

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Cheers,
_

[Sacha_D]

Thank you.
I added this 2 lines to my code and it began to work.

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3_Tasks::BaseData*");
scriptEngine.setDefaultPrototype(typeId, baseDataProto);

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3_Tasks::BaseData*");
scriptEngine.setDefaultPrototype(typeId, baseDataProto);

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But why it shows me the same error if I write like you advised to me?

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3::PFT3_Tasks::BaseData*");

const int typeId = qRegisterMetaType<PFT3::PFT3_Tasks::BaseData*>("PFT3::PFT3_Tasks::BaseData*");

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PFT3_Task is in namespace PFT3.

Same error

"TypeError: cannot call appendTask(): argument 1 has unknown type `PFT3_Tasks::BaseData*' (register the type with qScriptRegisterMetaType())"

I have got when BaseData in script was in globalObject direcly before I created this topic.

I want want to understand: "Why it not needs PFT3::"?

[anda_skoa]

Good question.
Do you have a "using namespace PFT3" clause somewhere?

Maybe try to call qRegisterMetaType without any argument, i.e. only specify the template argument but no value inside the parentheses.

Cheers,
_