qt-everywhere-src-5.14.1/qtbase/src/corelib/doc/snippets/code/src_corelib_kernel_qcoreapplication.cpp

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//! [0]
QMouseEvent event(QEvent::MouseButtonPress, pos, 0, 0, 0);
QApplication::sendEvent(mainWindow, &event);
//! [0]


//! [1]
QPushButton *quitButton = new QPushButton("Quit");
connect(quitButton, SIGNAL(clicked()), &app, SLOT(quit()), Qt::QueuedConnection);
//! [1]


//! [2]
foreach (const QString &path, app.libraryPaths())
    do_something(path);
//! [2]


//! [3]
// Called once QCoreApplication exists
static void preRoutineMyDebugTool()
{
    MyDebugTool* tool = new MyDebugTool(QCoreApplication::instance());
    QCoreApplication::instance()->installEventFilter(tool);
}

Q_COREAPP_STARTUP_FUNCTION(preRoutineMyDebugTool)
//! [3]


//! [4]
static int *global_ptr = 0;

static void cleanup_ptr()
{
    delete [] global_ptr;
    global_ptr = 0;
}

void init_ptr()
{
    global_ptr = new int[100];      // allocate data
    qAddPostRoutine(cleanup_ptr);   // delete later
}
//! [4]


//! [5]
class MyPrivateInitStuff : public QObject
{
public:
    static MyPrivateInitStuff *initStuff(QObject *parent)
    {
        if (!p)
            p = new MyPrivateInitStuff(parent);
        return p;
    }

    ~MyPrivateInitStuff()
    {
        // cleanup goes here
    }

private:
    MyPrivateInitStuff(QObject *parent)
        : QObject(parent)
    {
        // initialization goes here
    }

    MyPrivateInitStuff *p;
};
//! [5]


//! [6]
static inline QString tr(const char *sourceText,
                         const char *comment = 0);
static inline QString trUtf8(const char *sourceText,
                             const char *comment = 0);
//! [6]


//! [7]
class MyMfcView : public CView
{
    Q_DECLARE_TR_FUNCTIONS(MyMfcView)

public:
    MyMfcView();
    ...
};
//! [7]