[Qt-interest] same code but different results on Windows and Mac

[Yifei Li]

Hi all,

In the following minimal example, I want to show two messages one after another with some delay in between. 
Running this code on Windows 7 gives expected results, however, Mac OS (snow leopard) will show two messages together.

Can someone explain why there's such a difference? Thanks

Yifei

#include <QtGui/QApplication>
#include <QWidget>
#include <QThread>
#include <QVBoxLayout>
#include <QTextEdit>

class Plugin : public QObject {
    Q_OBJECT
public:
    void exec();

signals:
    void displayMessage(const QString&);
    void pause();
};


class Worker : public QThread {
        Q_OBJECT
public:
    Worker(Plugin* p) : m_plugin(p) {}
protected:
    void run() {m_plugin->exec();}
private slots:
    void pause() { sleep(1); }
private:
    Plugin* m_plugin;
};


#include "main.moc"

void Plugin::exec()
{
        emit displayMessage("hello1");
        emit pause();
        emit displayMessage("hello2");
        emit pause();
}


int main(int argc, char *argv[])
{
        QApplication a(argc, argv);
        QWidget* mainWidget = new QWidget;

        QVBoxLayout *layout = new QVBoxLayout;
        QTextEdit* view = new QTextEdit;
        layout->addWidget(view);
        mainWidget->setLayout(layout);

        mainWidget->show();
        Plugin* p = new Plugin;
       Worker* w = new Worker(p);
        QObject::connect(p, SIGNAL(pause()), w, SLOT(pause()));
        QObject::connect(p, SIGNAL(displayMessage(const QString&)), view, SLOT(append(const QString&)));
		 

        w->start();
        return a.exec();
}

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20101016/a03ba438/attachment.html