Creating QGenericArgument

[column]

Have simple application for testing QMetaObject::invokeMethod purpose :

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::setText( int value)
{
    QString s = QString::number(value);
    ui->textEdit->setText(s);
}





void MainWindow::on_pushButton_clicked()
{
    QGenericArgument genericArg =  Q_ARG(int, 321);
    bool inv = QMetaObject::invokeMethod( this,"setText",Qt::QueuedConnection, genericArg);
    qDebug("inv = %d\n", inv);
}

I'm getting 0 in setText value. Where 321 is gone?

[sierdzio]

@column said in Creating QGenericArgument:

    QGenericArgument genericArg =  Q_ARG(int, 321);
    bool inv = QMetaObject::invokeMethod( this,"setText",Qt::QueuedConnection, genericArg);
    qDebug("inv = %d\n", inv);

I'm getting 0 in setText value. Where 321 is gone?

Use Q_ARG directly. Do not store QGenericArgument, it won't work.

See the docs https://doc.qt.io/qt-5/qgenericargument.html

[sierdzio]

@column said in Creating QGenericArgument:

    QGenericArgument genericArg =  Q_ARG(int, 321);
    bool inv = QMetaObject::invokeMethod( this,"setText",Qt::QueuedConnection, genericArg);
    qDebug("inv = %d\n", inv);

I'm getting 0 in setText value. Where 321 is gone?

Use Q_ARG directly. Do not store QGenericArgument, it won't work.

See the docs https://doc.qt.io/qt-5/qgenericargument.html