• Replaced the gtk/gtk.h headerfile with my substitute.

• Event handling functions get NULL instead of a GdkEvent pointer.
• Packing flags (e.g. homogenus and spacing when calling gtk_hbox_new) ignored - I simply use QVBoxLayout, QHBoxLayout and QGridLayout where they fit best.
• Only a minimalist part of the API has been implemented (the process is build, add missing symbols, repeat)
• Most GtkXxx classes are defined to a QWidget. Objects are casted up and down all over the place to work around this.

#define G_OBJECT(obj) ((QObject*)(obj))
#define G_CALLBACK(func) ((void*)(func))

typedef void* gpointer;
typedef bool gboolean;
typedef char gchar;

#define g_print qDebug

...

#define GtkWidget QWidget

void gtk_widget_show(QWidget *w) { w->show(); }

#define GTK_WINDOW_TOPLEVEL (0)
QWidget *gtk_window_new(int) { return new QWidget(); }
void gtk_window_set_title(GtkWindow *w, const char *t) { w->setWindowTitle(QString(t)); }

...

#define GTK_BOX(obj) (obj->layout())
void gtk_box_pack_start(QLayout *l, QWidget *w, bool expand, bool fill, int padding) { l->addWidget(w); }

void g_signal_connect(QObject *src, const char *cstrEventName, void *f, void *data)
{
QString eventName = QString(cstrEventName);

if (eventName.endsWith("_event"))
{ // This is an event, f is an eventFuncPtr
  QObject *o = QGtkEventFilter::createFilter(eventName, eventFuncPtr(f), data);
  if(o)
      src->installEventFilter(o);
  else
      qWarning("Failed to match GTK event '%s' to a Qt event filter.", cstrEventName);
}
else
{ // This is a callback, f is an callbackFuncPtr
  QObject *o = new QGtkCallbackBridge(src, callbackFuncPtr(f), data);

  const char *signalName = 0;
  if(eventName == "clicked")
      signalName = SIGNAL(clicked());

  if (signalName)
      QObject::connect(src, signalName, o, SLOT(trigger()));
  else
      qWarning("Failed to match GTK signal '%s' to a Qt signal.", cstrEventName);
}
}

• Bookkeeping - there are a lot of receipts to handle, especially when starting. Insurances, web servers, car insurance, etc.
• Working from home - it works fairly well for me. I've come up with a scheme to keep myself motivated and actually working. However, a simple business lunch now takes three hours instead of one.
• Money takes time - I've been given offers, signing deals, working more than ever, and my next pay check is still not due until mid January. Worth thinking about.
• Time is not money - at least not yet. By being self employed I'm so much more flexible so that I get more quality time with my family, while making the money that I need (and some extra, but I guess that is for future expenses).