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#include <QtGui>

int main(int argc, char *argv[]){
    QApplication app(argc, argv);
    QMainWindow *window = new QMainWindow;
    QLineEdit *lineEdit= new QLineEdit("The position of cursor is 100,0");
    window->setCentralWidget(lineEdit);
    window->show();
    QMouseEvent *pressedLeftMouseButton = new QMouseEvent(QEvent::MouseButtonPress, 
                                                          QPoint(100,0),
	                                              Qt::LeftButton,
		                                   Qt::LeftButton,
		                                   Qt::NoModifier);
    app.postEvent( lineEdit, pressedLeftMouseButton);
    return app.exec();
}

        QDesktopWidget *desk = new QDesktopWidget;
        QPoint pos = desk->mapFromGlobal(QCursor::pos());
        QMouseEvent *mouse = new QMouseEvent(QEvent::MouseButtonPress, pos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier);
        QCoreApplication::postEvent(desk, mouse);

#ifdef Q_WS_WIN
#include <w32api.h>
#include <windows.h>
#endif

..........

    #ifdef Q_WS_WIN
            SetCursorPos(pos.x(), pos.y());
            Sleep(1);
            mouse_event(MOUSEEVENTF_MOVE, 0, 0, 0, GetMessageExtraInfo());
            Sleep(1);
            mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, GetMessageExtraInfo());
            Sleep(1);
            mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, GetMessageExtraInfo());
    #endif