experiment

console/Qt/untitled/main.cpp

@@ -1,11 +1,40 @@
-#include "mainwindow.h"
+// main.cpp
-#include <QApplication>
+#include <QtCore>
+
+class Task : public QObject
+{
+    Q_OBJECT
+public:
+    Task(QObject *parent = 0) : QObject(parent) {}
+
+public slots:
+    void run()
+    {
+        // Do processing here
+
+        emit finished();
+    }
+
+signals:
+    void finished();
+};
+
+#include "main.moc"
 
 int main(int argc, char *argv[])
 {
-  QApplication a(argc, argv);
+    QCoreApplication a(argc, argv);
-  MainWindow w;
-  w.show();
 
-  return a.exec();
+    // Task parented to the application so that it
+    // will be deleted by the application.
+    Task *task = new Task(&a);
+
+    // This will cause the application to exit when
+    // the task signals finished.
+    QObject::connect(task, SIGNAL(finished()), &a, SLOT(quit()));
+
+    // This will run the task from the application event loop.
+    QTimer::singleShot(0, task, SLOT(run()));
+
+    return a.exec();
 }