Use QObject with QtScript

[Ben1]

Hi everyboby,

I read the doc about how to use QObject with QtScript but I must mistake.

I re implement QFile

class FileRegister
{
public:
    static void Register(QScriptEngine *engine);
};
 
class File : public QObject
{
    Q_OBJECT
 
public:
    File(QString par_filePath, QObject *parent = 0);
    File(const File &);
    ~File();
 
    bool exist() { return file->exists(); }
    QString getName() { return file->fileName(); }
    QString getPath() { return fileInfo.path(); }
    int getSize() { return (int) file->size(); }
    bool isReadOnly() { return !fileInfo.isWritable(); }
    bool isHidden() { return fileInfo.isHidden(); }
    QDateTime getLastModified() { return fileInfo.lastModified(); }
    QDateTime getCreation() { return fileInfo.created(); }
 
    QString readAll();
    QString read(int length);
    bool write(QString data);
    bool resize(int length, QString text = "");
    bool append(QString text);
 
    bool compareContent(File file);
 
    bool rename(QString newName);
    bool copy(QString newPath);
    bool move(QString newPath);
    bool deleteFile();
 
    File operator =(File file);
 
private:
    QFile *file;
    QFileInfo fileInfo;
};

class FileRegister
{
public:
    static void Register(QScriptEngine *engine);
};

class File : public QObject
{
    Q_OBJECT

public:
    File(QString par_filePath, QObject *parent = 0);
    File(const File &);
    ~File();

    bool exist() { return file->exists(); }
    QString getName() { return file->fileName(); }
    QString getPath() { return fileInfo.path(); }
    int getSize() { return (int) file->size(); }
    bool isReadOnly() { return !fileInfo.isWritable(); }
    bool isHidden() { return fileInfo.isHidden(); }
    QDateTime getLastModified() { return fileInfo.lastModified(); }
    QDateTime getCreation() { return fileInfo.created(); }

    QString readAll();
    QString read(int length);
    bool write(QString data);
    bool resize(int length, QString text = "");
    bool append(QString text);

    bool compareContent(File file);

    bool rename(QString newName);
    bool copy(QString newPath);
    bool move(QString newPath);
    bool deleteFile();

    File operator =(File file);

private:
    QFile *file;
    QFileInfo fileInfo;
};

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QScriptValue createFile(QScriptContext *context, QScriptEngine *engine)
{
    if(context->argumentCount() != 1 || !context->argument(0).isString())
    {
        return engine->nullValue();
    }
 
    File *file = new File(context->argument(0).toString(), engine);
 
    return file->exist() ? engine->newQObject(file) : engine->nullValue();
}
 
void FileRegister::Register(QScriptEngine *engine)
{
    engine->globalObject().setProperty("File", engine->newFunction(createFile));
}

QScriptValue createFile(QScriptContext *context, QScriptEngine *engine)
{
    if(context->argumentCount() != 1 || !context->argument(0).isString())
    {
        return engine->nullValue();
    }

    File *file = new File(context->argument(0).toString(), engine);

    return file->exist() ? engine->newQObject(file) : engine->nullValue();
}

void FileRegister::Register(QScriptEngine *engine)
{
    engine->globalObject().setProperty("File", engine->newFunction(createFile));
}

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And I call

QScriptEngine *engine = new QScriptEngine(parent);
 
    FileRegister::Register(loc_engine);

QScriptEngine *engine = new QScriptEngine(parent);

    FileRegister::Register(loc_engine);

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but when I do engine->evaluate("test.txt") where test.txt contains this code

var file = File("toto.js");
file.exist();
file.readAll();
Math.Random();

var file = File("toto.js");
file.exist();
file.readAll();
Math.Random();

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I'have got this problem

ReferenceError: exist is not defined : line => 2

ReferenceError: exist is not defined : line => 2

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Thank you in advance.

[Urthas]

Sorry, er...what's "var" exactly? Does Qt think it's a class name and is therefore looking for var::exist()?

[Ben1]

var is the declaration of a variable in QtScript (I think)

The code :
var file = File("toto.js");
file.exist();
file.readAll();
Math.Random();
is my QtScript code (like ECMA). I may mistake when I wrote this.

Note : I add Q_INVOKABLE before all declaration of method in the .h file, nothing change.

[asvil]

May be you have null value in qt script.

print(typeof file)

print(typeof file)

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[Ben1]

I wrote this :
var file = File("toto.js");
print(typeof file);

and in the cpp file:
QScriptValue loc_value = m_engine->evaluate(loc_currentScenario->GetProgram(), "fichier.txt");
qDebug(QString(loc_value.toString()).toLatin1());

the result is : undefined

Does it mean that the var file is null ? (I check if the return of the register méthod is null, and it's null)

[Ben1]

Ok, my mistake seems to be here :

return file->exist() ? engine->newQObject(file) : engine->nullValue();

replace by :

return engine->newQObject(file) ;

And it seems work correctly