Windows: Introduce helper class for implementing COM interfaces

Task-number: QTBUG-43190
Change-Id: I565e3c57631c32a88ac7598758526c349ddf3312
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 3 insertions, 14 deletions

diff --git a/src/plugins/platforms/windows/qwindowsole.h b/src/plugins/platforms/windows/qwindowsole.h
index 643011272b..fc58858f2c 100644
--- a/src/plugins/platforms/windows/qwindowsole.h
+++ b/src/plugins/platforms/windows/qwindowsole.h
@@ -40,6 +40,7 @@
 #ifndef QWINDOWSOLE_H
 #define QWINDOWSOLE_H
 
+#include "qwindowscombase.h"
 #include <QtCore/qt_windows.h>
 
 #include <QtCore/QMap>
@@ -53,7 +54,7 @@ QT_BEGIN_NAMESPACE
 class QMimeData;
 class QWindow;
 
-class QWindowsOleDataObject : public IDataObject
+class QWindowsOleDataObject : public QWindowsComBase<IDataObject>
 {
 public:
     explicit QWindowsOleDataObject(QMimeData *mimeData);
@@ -63,11 +64,6 @@ public:
     QMimeData *mimeData() const;
     DWORD reportedPerformedEffect() const;
 
-    // IUnknown methods
-    STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
-    STDMETHOD_(ULONG,AddRef)(void);
-    STDMETHOD_(ULONG,Release)(void);
-
     // IDataObject methods
     STDMETHOD(GetData)(LPFORMATETC pformatetcIn, LPSTGMEDIUM pmedium);
     STDMETHOD(GetDataHere)(LPFORMATETC pformatetc, LPSTGMEDIUM pmedium);
@@ -82,13 +78,12 @@ public:
     STDMETHOD(EnumDAdvise)(LPENUMSTATDATA FAR* ppenumAdvise);
 
 private:
-    ULONG m_refs = 1;
     QPointer<QMimeData> data;
     const int CF_PERFORMEDDROPEFFECT;
     DWORD performedEffect = DROPEFFECT_NONE;
 };
 
-class QWindowsOleEnumFmtEtc : public IEnumFORMATETC
+class QWindowsOleEnumFmtEtc : public QWindowsComBase<IEnumFORMATETC>
 {
 public:
     explicit QWindowsOleEnumFmtEtc(const QVector<FORMATETC> &fmtetcs);
@@ -97,11 +92,6 @@ public:
 
     bool isNull() const;
 
-    // IUnknown methods
-    STDMETHOD(QueryInterface)(REFIID riid, void FAR* FAR* ppvObj);
-    STDMETHOD_(ULONG,AddRef)(void);
-    STDMETHOD_(ULONG,Release)(void);
-
     // IEnumFORMATETC methods
     STDMETHOD(Next)(ULONG celt, LPFORMATETC rgelt, ULONG FAR* pceltFetched);
     STDMETHOD(Skip)(ULONG celt);
@@ -111,7 +101,6 @@ public:
 private:
     bool copyFormatEtc(LPFORMATETC dest, const FORMATETC *src) const;
 
-    ULONG m_dwRefs = 1;
     ULONG m_nIndex = 0;
     QVector<LPFORMATETC> m_lpfmtetcs;
     bool m_isNull = false;