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c++ Programming Glossary: iidWhen implementing several COM interfaces at once how do I upcast to IUnknown? http://stackoverflow.com/questions/1742329/when-implementing-several-com-interfaces-at-once-how-do-i-upcast-to-iunknown upcast explicitly I need to use either of the two ways if iid __uuidof IUnknown ppv static_cast IPersistFile this static_cast.. static_cast IPersistFile this AddRef return S_OK or if iid __uuidof IUnknown ppv static_cast IPersistStream this static_cast..
http://stackoverflow.com/questions/1742848/why-exactly-do-i-need-an-explicit-upcast-when-implementing-queryinterface-in-a explicitly upcast this pointer to one of the interfaces if iid __uuidof IUnknown ppv static_cast IInterface1 this call Addref.. return S_OK The question is why can't I just copy this if iid __uuidof IUnknown ppv this call Addref return S_OK The documents..
http://stackoverflow.com/questions/20836017/adding-a-custom-widget-to-qt-q-property-or-customwidgetobjectnames-as-a-pr QObject createExtension QObject object const QString iid QObject parent const #endif dynamicpropertyextension.cpp #include.. createExtension QObject object const QString iid QObject parent const if iid Q_TYPEID QDesignerDynamicPropertySheetExtension.. object const QString iid QObject parent const if iid Q_TYPEID QDesignerDynamicPropertySheetExtension return 0 if..
Will a “variableName;” C++ statement be a no-op at all times? http://stackoverflow.com/questions/4030959/will-a-variablename-c-statement-be-a-no-op-at-all-times macro HRESULT WINAPI blindQuery void currentObject REFIID iid void ppv DWORD_PTR param DEBUG_LOG __FUNCTION__ DEBUG_LOG macro.. macro expands to an empty string in non debug DEBUG_LOG iid iid silence compiler warning if ppv 0 return E_POINTER ppv 0.. expands to an empty string in non debug DEBUG_LOG iid iid silence compiler warning if ppv 0 return E_POINTER ppv 0 return..
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