diff --git a/qml.core.scm b/qml.core.scm
index 9bfabe5..5c9425e 100644
--- a/qml.core.scm
+++ b/qml.core.scm
@@ -1,48 +1,82 @@
+;; -*- geiser-scheme: chicken -*-
 (module (qml core)
     *
   (import (scheme base))
   (import (chicken gc))
   (import (chicken string))
+  (import (chicken base))
+  (import (chicken condition))
   (import (qml lowlevel))
-  (import coops coops-primitive-objects coops-extras)
+  (import coops coops-primitive-objects coops-extras srfi-1 srfi-69)
 
   ;; Enums
   (define-class <Enum> ()
-    ((value accessor: value)))
+    ((val accessor: val)))
 
   (define-class <QEventLoopProcessEventFlag> (<Enum>))
-  (define (qevent-loop-process-event-flag value)
-    (case value
+  (define (qevent-loop-process-event-flag val)
+    (case val
       ((process-all-events:)
-       (make <QEventLoopProcessEventFlag> 'value DosQEventLoopProcessEventFlagProcessAllEvents))
+       (make <QEventLoopProcessEventFlag> 'val DosQEventLoopProcessEventFlagProcessAllEvents))
       ((exclude-user-input-events:)
-       (make <QEventLoopProcessEventFlag> 'value DosQEventLoopProcessEventFlagExcludeUserInputEvents))
+       (make <QEventLoopProcessEventFlag> 'val DosQEventLoopProcessEventFlagExcludeUserInputEvents))
       ((process-exclude-socket-notifiers:)
-       (make <QEventLoopProcessEventFlag> 'value DosQEventLoopProcessEventFlagProcessExcludeSocketNotifiers))
+       (make <QEventLoopProcessEventFlag> 'val DosQEventLoopProcessEventFlagProcessExcludeSocketNotifiers))
       ((process-all-events-wait-for-more-events:)
-       (make <QEventLoopProcessEventFlag> 'value DosQEventLoopProcessEventFlagProcessAllEventsWaitForMoreEvents))))
+       (make <QEventLoopProcessEventFlag> 'val DosQEventLoopProcessEventFlagProcessAllEventsWaitForMoreEvents))))
 
   (define-class <QtConnectionType> (<Enum>))
-  (define (qt-connection-type value)
-    (case value
+  (define (qt-connection-type val)
+    (case val
       ((auto:)
-       (make <QtConnectionType> 'value DosQtConnectionTypeAutoConnection))
+       (make <QtConnectionType> 'val DosQtConnectionTypeAutoConnection))
       ((direct:)
-       (make <QtConnectionType> 'value DosQtConnectionTypeDirectConnection))
+       (make <QtConnectionType> 'val DosQtConnectionTypeDirectConnection))
       ((queued:)
-       (make <QtConnectionType> 'value DosQtConnectionTypeQueuedConnection))
+       (make <QtConnectionType> 'val DosQtConnectionTypeQueuedConnection))
       ((blocking:)
-       (make <QtConnectionType> 'value DosQtConnectionTypeBlockingConnection))
+       (make <QtConnectionType> 'val DosQtConnectionTypeBlockingConnection))
       ((unique:)
-       (make <QtConnectionType> 'value DosQtConnectionTypeUniqueConnection))))
+       (make <QtConnectionType> 'val DosQtConnectionTypeUniqueConnection))))
+
+  (define-class <QQuickViewResizeMode> (<Enum>))
+  (define (qquick-view-resize-mode val)
+    (case val
+      ((size-view-to-root-object:) (make <QQuickViewResizeMode> 'val #x0))
+      ((size-root-object-to-view:) (make <QQuickViewResizeMode> 'val #x1))))
+
+  (define-class <QItemDataRole> (<Enum>))
+  (define (qitem-data-role val)
+    (case val
+      ((display:) (make <QItemDataRole> 'val 0))
+      ((decoration:) (make <QItemDataRole> 'val 1))
+      ((edit:) (make <QItemDataRole> 'val 2))
+      ((tool-tip:) (make <QItemDataRole> 'val 3))
+      ((status-tip:) (make <QItemDataRole> 'val 4))
+      ((whats-this:) (make <QItemDataRole> 'val 5))
+      ((font:) (make <QItemDataRole> 'val 6))
+      ((text-alignment:) (make <QItemDataRole> 'val 7))
+      ((background:) (make <QItemDataRole> 'val 8))
+      ((foreground:) (make <QItemDataRole> 'val 9))
+      ((check-state:) (make <QItemDataRole> 'val 10))
+      ((accessible-text:) (make <QItemDataRole> 'val 11))
+      ((accessible-description:) (make <QItemDataRole> 'val 12))
+      ((size-hint:) (make <QItemDataRole> 'val 13))
+      ((initial-sort-order:) (make <QItemDataRole> 'val 14))))
+
+  (define-class <QtOrientation> (<Enum>))
+  (define (qt-orientation val)
+    (case val
+      ((horizontal:) (make <QtOrientation> 'val #x01))
+      ((vertical:) (make <QtOrientation> 'val #x02))))
 
   ;; Helpers
   (define (application-dir-path)
     (dos_qcoreapplication_application_dir_path))
   (define-method (process-events (flag <QEventLoopProcessEventFlag>))
-    (dos_qcoreapplication_process_events (value flag)))
+    (dos_qcoreapplication_process_events (val flag)))
   (define-method (process-events-timed (flag <QEventLoopProcessEventFlag>) (timed <integer>))
-    (dos_qcoreapplication_process_events_timed (value flag) timed))
+    (dos_qcoreapplication_process_events_timed (val flag) timed))
 
   (define (gui-application-create)
     (dos_qguiapplication_create))
@@ -68,26 +102,96 @@
     (dos_qquickstyle_set_fallback_style style))
 
   ;; Objects
-  (define-class <QObject> ()
-    ((ptr accessor: ptr)))
+  (define callback-registry
+    (make-hash-table))
+
+  (define-method (refcount (alist <list>))
+    (cdr (find (lambda (a) (eq? refcount: (car a))) alist)))
+  (define-method (refcount (ht <hash-table>) (ptr <pointer>))
+    (if (hash-table-exists? callback-registry ptr)
+        (refcount (hash-table-ref ht ptr))
+        0))
+
+  (define-class <QMLBase> ()
+    ((ptr accessor: ptr initform: #f)))
+  (define-method (delete-pointer (qbase <QMLBase>))
+    (abort (make-property-condition 'exn 'Message "Please implement the delete method for your subtype.")))
+  (define-method (add-ptrentry (qbase <QMLBase>))
+    (hash-table-update! callback-registry (ptr qbase)
+                        (lambda (alist)
+                          (alist-update refcount: (+ 1 (refcount alist)) alist))
+                        (lambda ()
+                          (alist-cons refcount: 1 '()))))
+  (define-method (remove-ptrentry (qbase <QMLBase>))
+    (if (eq? 1 (refcount callback-registry (ptr qbase)))
+        (hash-table-delete! callback-registry (ptr qbase))
+        (hash-table-update! callback-registry (ptr qbase)
+                            (lambda (alist)
+                              (alist-update refcount: (- (refcount alist) 1) alist)))))
+  (define-method (initialize-instance (qbase <QMLBase>))
+    (call-next-method)
+    (add-ptrentry qbase)
+    (set-finalizer! qbase (lambda (obj)
+                            (remove-ptrentry qbase)
+                            (when (= 0 (refcount callback-registry (ptr qbase)))
+                              (delete-pointer qbase)))))
+
+  (define-class <QObject> (<QMLBase>))
   (define-method (signal-emit (qo <QObject>) (name <string>) (paramcount <integer>) (parameters <sequence>))
     (dos_qobject_signal_emit (ptr qo) name paramcount parameters))
-  (define-method (delete (qo <QObject>))
+  (define-method (delete-pointer (qo <QObject>))
     (dos_qobject_delete (ptr qo)))
-  (define-method (delete-later (qo <QObject>))
+  (define-method (delete-pointer-later (qo <QObject>))
     (dos_qobject_deleteLater (ptr qo)))
 
-  (define-class <QVariant> ()
+  (define-class <QVariant> (<QMLBase>)
     ((ptr accessor: ptr)))
+  (define-method (initialize-instance (qv <QVariant>))
+    (set! (ptr qv) (dos_qvariant_create))
+    (call-next-method))
+  (define-method (qvariant (val <integer>))
+    (make <QVariant> 'ptr (dos_qvariant_create_int val)))
+  (define-method (qvariant (val <boolean>))
+    (make <QVariant> 'ptr (dos_qvariant_create_bool val)))
+  (define-method (qvariant (val <string>))
+    (make <QVariant> 'ptr (dos_qvariant_create_string val)))
+  (define-method (qvariant (val <QObject>))
+    (make <QVariant> 'ptr (dos_qvariant_create_qobject (ptr val))))
+  (define-method (qvariant (val <flonum>))
+    (make <QVariant> 'ptr (dos_qvariant_create_float val)))
+  (define-method (set (qv <QVariant>) (val <integer>))
+    (dos_qvariant_setInt (ptr qv) val))
+  (define-method (set (qv <QVariant>) (val <boolean>))
+    (dos_qvariant_setBool (ptr qv) val))
+  (define-method (set (qv <QVariant>) (val <flonum>))
+    (dos_qvariant_setFloat (ptr qv) val))
+  (define-method (set (qv <QVariant>) (val <string>))
+    (dos_qvariant_setString (ptr qv) val))
+  (define-method (set (qv <QVariant>) (val <QObject>))
+    (dos_qvariant_setQObject (ptr qv) (ptr val)))
+  (define-method (to (qv <QVariant>) (target <keyword>))
+    (case target
+      ((integer:) (dos_qvariant_toInt (ptr qv)))
+      ((boolean:) (dos_qvariant_toBool (ptr qv)))
+      ((string:)  (dos_qvariant_toString (ptr qv)))
+      ((flonum:)  (dos_qvariant_toFloat (ptr qv)))
+      ((qobject:) (dos_qvariant_toQObject (ptr qv)))))
+  (define-method (is-null? (qv <QVariant>))
+    (dos_qvariant_isnull (ptr qv)))
+  (define-method (assign (qv <QVariant>) (other <QVariant>))
+    (dos_qvariant_assign (ptr qv) (ptr other)))
+  (define-method (copy (qv <QVariant>))
+    (make <QVariant> 'ptr (dos_qvariant_create_qvariant (ptr qv))))
+  (define-method (delete-pointer (qv <QVariant>))
+    (dos_qvariant_delete (ptr qv)))
 
   (define-class <QQmlContext> (<QObject>))
   (define-method (base-url (context <QQmlContext>))
     (dos_qqmlcontext_baseUrl (ptr context)))
-  (define-method (set-property (context <QQmlContext>) (name <string>) (value <QVariant>))
-    (dos_qqmlcontext_setcontextproperty (ptr context) name (ptr value)))
+  (define-method (set-property (context <QQmlContext>) (name <string>) (qvalue <QVariant>))
+    (dos_qqmlcontext_setcontextproperty (ptr context) name (ptr qvalue)))
 
-  (define-class <QUrl> ()
-    ((ptr accessor: ptr)))
+  (define-class <QUrl> (<QMLBase>))
   (define (new-QUrl url)
     (let ((qurl (make <QUrl> 'ptr (dos_qurl_create url 0))))
       qurl))
@@ -95,13 +199,13 @@
     (dos_qurl_to_string (ptr qurl)))
   (define-method (valid? (qurl <QUrl>))
     (dos_qurl_isValid (ptr qurl)))
-  (define-method (delete (qurl <QUrl>))
+  (define-method (delete-pointer (qurl <QUrl>))
     (dos_qurl_delete (ptr qurl)))
 
-  (define-class <QPixmap> ()
-    ((ptr accessor: ptr)))
-  (define (new-QPixmap)
-    (make <QPixmap> 'ptr (dos_qpixmap_create)))
+  (define-class <QPixmap> (<QMLBase>))
+  (define-method (initialize-instance (qpx <QPixmap>))
+    (set! (slot-value qpx 'ptr) (dos_qpixmap_create))
+    (call-next-method))
   (define (new-QPixmap width height)
     (make <QPixmap> 'ptr (dos_qpixmap_create_width_and_height width height)))
   (define-method (copy (qpix <QPixmap>))
@@ -116,19 +220,19 @@
     (dos_qpixmap_assign (ptr qpix) (ptr other)))
   (define-method (is-null? (qpix <QPixmap>))
     (dos_qpixmap_isNull (ptr qpix)))
-  (define-method (delete (qpix <QPixmap>))
+  (define-method (delete-pointer (qpix <QPixmap>))
     (dos_qpixmap_delete (ptr qpix)))
 
-  (define-class <QQuickImageProvider> ()
-    ((ptr accessor: ptr)))
+  (define-class <QQuickImageProvider> (<QMLBase>))
   (define-method (new-QQuickImageProvider callback)
     (make <QQuickImageProvider> 'ptr (dos_qquickimageprovider_create callback)))
-  (define-method (delete (qip <QQuickImageProvider>))
+  (define-method (delete-pointer (qip <QQuickImageProvider>))
     (dos_qquickimageprovider_delete (ptr qip)))
 
   (define-class <QQmlApplicationEngine> (<QObject>))
-  (define (new-QQmlApplicationEngine)
-    (make <QQmlApplicationEngine> 'ptr (dos_qqmlapplicationengine_create)))
+  (define-method (initialize-instance (qae <QQmlApplicationEngine>))
+    (set! (slot-value qae 'ptr) (dos_qqmlapplicationengine_create))
+    (call-next-method))
   (define-method (load (appengine <QQmlApplicationEngine>) (filePath <string>))
     (dos_qqmlapplicationengine_load (ptr appengine) filePath))
   (define-method (load-url (appengine <QQmlApplicationEngine>) (qurl <QUrl>))
@@ -141,18 +245,13 @@
     (make <QQmlContext> 'ptr (dos_qqmlapplicationengine_context (ptr appengine))))
   (define-method (add-image-provider (appengine <QQmlApplicationEngine>) (provider-id <string>) (provider <QQuickImageProvider>))
     (dos_qqmlapplicationengine_addImageProvider (ptr appengine) provider-id (ptr provider)))
-  (define-method (delete (appengine <QQmlApplicationEngine>))
+  (define-method (delete-pointer (appengine <QQmlApplicationEngine>))
     (dos_qqmlapplicationengine_delete (ptr appengine)))
 
-  (define-class <QQuickViewResizeMode> (<Enum>))
-  (define (qquick-view-resize-mode value)
-    (case value
-      ((size-view-to-root-object:) (make <QQuickViewResizeMode> 'value 0))
-      ((size-root-object-to-view:) (make <QQuickViewResizeMode> 'value 1))))
-
   (define-class <QQuickView> (<QObject>))
-  (define (new-QQuickView)
-    (make <QQuickView> 'ptr (dos_qquickview_create)))
+  (define-method (initialize-instance (qqv <QQuickView>))
+    (set! (slot-value qqv 'ptr) (dos_qquickview_create))
+    (call-next-method))
   (define-method (show (qqv <QQuickView>))
     (dos_qquickview_show (ptr qqv)))
   (define-method (source (qqv <QQuickView>))
@@ -162,90 +261,55 @@
   (define-method (set-source (qqv <QQuickView>) (filename <string>))
     (dos_qquickview_set_source (ptr qqv) filename))
   (define-method (set-resize-mode (qqv <QQuickView>) (mode <QQuickViewResizeMode>))
-    (dos_qquickview_set_resize_mode (ptr qqv) (value mode)))
+    (dos_qquickview_set_resize_mode (ptr qqv) (val mode)))
   (define-method (root-context (qqv <QQuickView>))
     (make <QQmlContext> 'ptr (dos_qquickview_rootContext (ptr qqv))))
-  (define-method (delete (qqv <QQuickView>))
+  (define-method (delete-pointer (qqv <QQuickView>))
     (dos_qquickview_delete (ptr qqv)))
 
-  (define-class <QVariant> ()
-    ((ptr accessor: ptr)))
-  (define-method (initialize-instance (qv <QVariant>))
-    (call-next-method)
-    (set! (ptr qv) (dos_qvariant_create)))
-  (define-method (qvariant (value <integer>))
-    (make <QVariant> 'ptr (dos_qvariant_create_int value)))
-  (define-method (qvariant (value <boolean>))
-    (make <QVariant> 'ptr (dos_qvariant_create_bool value)))
-  (define-method (qvariant (value <string>))
-    (make <QVariant> 'ptr (dos_qvariant_create_string value)))
-  (define-method (qvariant (value <QObject>))
-    (make <QVariant> 'ptr (dos_qvariant_create_qobject (ptr value))))
-  (define-method (qvariant (value <flonum>))
-    (make <QVariant> 'ptr (dos_qvariant_create_float value)))
-  (define-method (set (qv <QVariant>) (value <integer>))
-    (dos_qvariant_setInt (ptr qv) value))
-  (define-method (set (qv <QVariant>) (value <boolean>))
-    (dos_qvariant_setBool (ptr qv) value))
-  (define-method (set (qv <QVariant>) (value <flonum>))
-    (dos_qvariant_setFloat (ptr qv) value))
-  (define-method (set (qv <QVariant>) (value <string>))
-    (dos_qvariant_setString (ptr qv) value))
-  (define-method (set (qv <QVariant>) (value <QObject>))
-    (dos_qvariant_setQObject (ptr qv) (ptr value)))
-  (define-method (to (qv <QVariant>) (target <keyword>))
-    (case target
-      ((integer:) (dos_qvariant_toInt (ptr qv)))
-      ((boolean:) (dos_qvariant_toBool (ptr qv)))
-      ((string:)  (dos_qvariant_toString (ptr qv)))
-      ((flonum:)  (dos_qvariant_toFloat (ptr qv)))
-      ((qobject:) (dos_qvariant_toQObject (ptr qv)))))
-  (define-method (is-null? (qv <QVariant>))
-    (dos_qvariant_isnull (ptr qv)))
-  (define-method (assign (qv <QVariant>) (other <QVariant>))
-    (dos_qvariant_assign (ptr qv) (ptr other)))
-  (define-method (copy (qv <QVariant>))
-    (make <QVariant> 'ptr (dos_qvariant_create_qvariant (ptr qv))))
-  (define-method (delete (qv <QVariant>))
-    (dos_qvariant_delete (ptr qv)))
-
-  (define-class <QMetaObject> ()
-    ((ptr accessor: ptr)))
-  (define (new-QMetaObject superclass, classname, signal-definitions, slot-definitions, property-definitions)
+  (define-class <QMetaObject> (<QMLBase>))
+  (define (new-QMetaObject superclass classname signal-definitions slot-definitions property-definitions)
     (make <QMetaObject> 'ptr (dos_qmetaobject_create (ptr superclass) classname signal-definitions
                                                      slot-definitions property-definitions)))
   (define-method (invoke-method (qmo <QMetaObject>) (callback <procedure>) (data <pointer>) (connection-type <QtConnectionType>))
-    (dos_qmetaobject_invoke_method (ptr qmo) callback data (value connection-type)))
-  (define-method (delete (qmo <QMetaObject>))
+    (dos_qmetaobject_invoke_method (ptr qmo) callback data (val connection-type)))
+  (define-method (delete-pointer (qmo <QMetaObject>))
     (dos_qmetaobject_delete (ptr qmo)))
 
-  (define-class <QItemDataRole> (<Enum>))
-  (define (qitem-data-role value)
-    (case value
-      ((display:) (make <QItemDataRole> 'value 0))
-      ((decoration:) (make <QItemDataRole> 'value 1))
-      ((edit:) (make <QItemDataRole> 'value 2))
-      ((tool-tip:) (make <QItemDataRole> 'value 3))
-      ((status-tip:) (make <QItemDataRole> 'value 4))
-      ((whats-this:) (make <QItemDataRole> 'value 5))
-      ((font:) (make <QItemDataRole> 'value 6))
-      ((text-alignment:) (make <QItemDataRole> 'value 7))
-      ((background:) (make <QItemDataRole> 'value 8))
-      ((foreground:) (make <QItemDataRole> 'value 9))
-      ((check-state:) (make <QItemDataRole> 'value 10))
-      ((accessible-text:) (make <QItemDataRole> 'value 11))
-      ((accessible-description:) (make <QItemDataRole> 'value 12))
-      ((size-hint:) (make <QItemDataRole> 'value 13))
-      ((initial-sort-order:) (make <QItemDataRole> 'value 14))))
+  (define-class <QModelIndex> (<QMLBase>))
+  (define-method (initialize-instance (qmi <QModelIndex>))
+    (set! (ptr qmi) (dos_qmodelindex_create))
+    (call-next-method))
+  (define-method (copy (qmi <QModelIndex>) (other <QModelIndex>))
+    (make <QModelIndex> 'ptr (dos_qmodelindex_create_qmodelindex (ptr qmi) (ptr other))))
+  (define-method (row (qmi <QModelIndex>))
+    (dos_qmodelindex_row (ptr qmi)))
+  (define-method (column (qmi <QModelIndex>))
+    (dos_qmodelindex_column (ptr qmi)))
+  (define-method (is-valid? (qmi <QModelIndex>))
+    (dos_qmodelindex_isValid (ptr qmi)))
+  (define-method (data (qmi <QModelIndex>) (role <QItemDataRole>))
+    (dos_qmodelindex_data (ptr qmi) (val role)))
+  (define-method (parent (qmi <QModelIndex>))
+    (make <QModelIndex> 'ptr (dos_qmodelindex_parent (ptr qmi))))
+  (define-method (child (qmi <QModelIndex>) (row <integer>) (column <integer>))
+    (make <QModelIndex> 'ptr (dos_qmodelindex_child (ptr qmi) row column)))
+  (define-method (sibling (qmi <QModelIndex>) (row <integer>) (column <integer>))
+    (make <QModelIndex> 'ptr (dos_qmodelindex_sibling (ptr qmi) row column)))
+  (define-method (assign (qmi <QModelIndex>) (other <QModelIndex>))
+    (dos_qmodelindex_assign (ptr qmi) (ptr other)))
+  (define-method (delete-pointer (qmi <QModelIndex>))
+    (dos_qmodelindex_delete (ptr qmi)))
 
   (define-class <QAbstractItemModel> (<QObject>))
   (define (new-QAbstractItemModel callback meta-object dcallback callbacks)
     (dos_qabstractitemmodel_create callback (ptr meta-object) dcallback (ptr callbacks)))
   (define-method (set-data (qaim <QAbstractItemModel>) (qmi <QModelIndex>) (qv <QVariant>) (role <QItemDataRole>))
-    (dos_qabstractitemmodel_setData (ptr qaim) (ptr qmi) (ptr qv) (value role)))
+    (dos_qabstractitemmodel_setData (ptr qaim) (ptr qmi) (ptr qv) (val role)))
   (define-method (flags (qaim <QAbstractItemModel>) (qmi <QModelIndex>))
     (dos_qabstractitemmodel_flags (ptr qaim) (ptr qmi)))
-  (define-method (header-data))
+  (define-method (header-data (qaim <QAbstractItemModel>) (section <integer>) (orientation <QtOrientation>) (role <integer>))
+    (dos_qabstractitemmodel_headerData (ptr qaim) section (val orientation) role))
 
   (define-class <QAbstractListModel> (<QObject>))
   (define (new-QAbstractListModel callback qalm dcallback callbacks)
diff --git a/qml.egg b/qml.egg
index df0dd28..ca1d2c3 100644
--- a/qml.egg
+++ b/qml.egg
@@ -3,7 +3,7 @@
  (synopsis "A Chicken wrapper for DOtherSide")
  (category ui)
  (license "LGPLv3")
- (dependencies coops coops-utils foreigners utf8)
+ (dependencies coops coops-utils foreigners utf8 srfi-69)
  (foreign-dependencies Qt5Core
                        Qt5Widgets
                        Qt5Gui
@@ -57,7 +57,7 @@
                           "-L" "-lQt5Network"
                           "-L" "-lQt5Test"
                           "-L" "-lQt5QuickTest"
-                          "-L" "-lOpenGL"))))
-  ;;(extension qml.core
-  ;;           (component-dependencies qml.lowlevel))
+                          "-L" "-lOpenGL"))
+  (extension qml.core
+             (component-dependencies qml.lowlevel))))
 
diff --git a/qml.lowlevel.scm b/qml.lowlevel.scm
index 6c3ba59..e7a010f 100644
--- a/qml.lowlevel.scm
+++ b/qml.lowlevel.scm
@@ -1,3 +1,4 @@
+;; -*- geiser-scheme: chicken -*-
 (module (qml lowlevel)
     *
   (import (scheme base))
@@ -109,17 +110,17 @@
     (define-foreign-type DosQAbstractItemModelCallbacks (struct "DosQAbstractItemModelCallbacks"))
 
     (define-foreign-type DosQEventLoopProcessEventFlag (enum "DosQEventLoopProcessEventFlag"))
-    (define DosQEventLoopProcessEventFlagProcessAllEvents (foreign-value "0x00" byte))
-    (define DosQEventLoopProcessEventFlagExcludeUserInputEvents (foreign-value "0x01" byte))
-    (define DosQEventLoopProcessEventFlagProcessExcludeSocketNotifiers (foreign-value "0x02" byte))
-    (define DosQEventLoopProcessEventFlagProcessAllEventsWaitForMoreEvents (foreign-value "0x03" byte))
+    (define DosQEventLoopProcessEventFlagProcessAllEvents #x00)
+    (define DosQEventLoopProcessEventFlagExcludeUserInputEvents #x01)
+    (define DosQEventLoopProcessEventFlagProcessExcludeSocketNotifiers #x02)
+    (define DosQEventLoopProcessEventFlagProcessAllEventsWaitForMoreEvents #x03)
 
     (define-foreign-type DosQtConnectionType (enum "DosQtConnectionType"))
     (define DosQtConnectionTypeAutoConnection 0)
     (define DosQtConnectionTypeDirectConnection 1)
     (define DosQtConnectionTypeQueuedConnection 2)
     (define DosQtConnectionTypeBlockingConnection 3)
-    (define DosQtConnectionTypeUniqueConnection (foreign-value "0x80" byte))
+    (define DosQtConnectionTypeUniqueConnection #x80)
 
     ;; Functions
     ;; QCoreApplication