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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QTest>
#ifdef Q_OS_WIN
# include <private/qcomobject_p.h>
# include <wrl/client.h>
using Microsoft::WRL::ComPtr;
QT_BEGIN_NAMESPACE
template <typename T, typename... Args>
ComPtr<T> makeComObject(Args &&...args)
{
ComPtr<T> p;
// Don't use Attach because of MINGW64 bug
// #892 Microsoft::WRL::ComPtr::Attach leaks references
*p.GetAddressOf() = new T(std::forward<Args>(args)...);
return p;
}
MIDL_INTERFACE("878fab04-7da0-41ea-9c49-058c7fa0d80a")
IIntermediate : public IUnknown{};
MIDL_INTERFACE("65a29ce9-191c-4182-9185-06dd70aafc5d")
IDirect : public IIntermediate{};
class ComImplementation : public QComObject<IDirect>
{
};
MIDL_INTERFACE("d05397e0-da7f-4055-8563-a5b80f095e6c")
IMultipleA : public IUnknown{};
MIDL_INTERFACE("67e298c5-ec5f-4c45-a779-bfba2484e142")
IMultipleB : public IUnknown{};
class MultipleComImplementation : public QComObject<IMultipleA, IMultipleB>
{
};
MIDL_INTERFACE("b8278a1b-0c3b-4bbd-99db-1e8a141483fa")
IOther : public IUnknown{};
# ifdef __CRT_UUID_DECL
__CRT_UUID_DECL(IIntermediate, 0x878fab04, 0x7da0, 0x41ea, 0x9c, 0x49, 0x05, 0x8c, 0x7f, 0xa0, 0xd8,
0x0a)
__CRT_UUID_DECL(IDirect, 0x65a29ce9, 0x191c, 0x4182, 0x91, 0x85, 0x06, 0xdd, 0x70, 0xaa, 0xfc, 0x5d)
__CRT_UUID_DECL(IMultipleA, 0xd05397e0, 0xda7f, 0x4055, 0x85, 0x63, 0xa5, 0xb8, 0x0f, 0x09, 0x5e,
0x6c)
__CRT_UUID_DECL(IMultipleB, 0x67e298c5, 0xec5f, 0x4c45, 0xa7, 0x79, 0xbf, 0xba, 0x24, 0x84, 0xe1,
0x42)
__CRT_UUID_DECL(IOther, 0xb8278a1b, 0x0c3b, 0x4bbd, 0x99, 0xdb, 0x1e, 0x8a, 0x14, 0x14, 0x83, 0xfa)
# endif
namespace QtPrivate {
template <>
struct QComObjectTraits<IDirect>
{
static constexpr bool isGuidOf(REFIID riid) noexcept
{
return QComObjectTraits<IDirect, IIntermediate>::isGuidOf(riid);
}
};
} // namespace QtPrivate
class tst_QComObject : public QObject
{
Q_OBJECT
private slots:
void QueryInterface_returnsConvertedPointer_whenIUnknownIsRequested();
void QueryInterface_returnsConvertedPointer_whenDirectParentIsRequested();
void QueryInterface_returnsConvertedPointer_whenDirectIntermediateIsRequested();
void QueryInterface_returnsConvertedPointer_whenIUnknownOfMultipleParentsIsRequested();
void QueryInterface_returnsConvertedPointer_whenFirstOfMultipleParentsIsRequested();
void QueryInterface_returnsConvertedPointer_whenSecondOfMultipleParentsIsRequested();
void QueryInterface_returnsNullPointer_whenNonParentIsRequested();
void QueryInterface_returnsNullPointer_whenNullPointerIsPassedForReceivingObject();
void QueryInterface_incrementsReferenceCount_whenConvertedPointerIsReturned();
void AddRef_incrementsReferenceCountByOne();
void Release_decrementsReferenceCountByOne();
};
void tst_QComObject::QueryInterface_returnsConvertedPointer_whenIUnknownIsRequested()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
ComPtr<IUnknown> unknown;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IUnknown), &unknown);
// Assert
QCOMPARE(queryResult, S_OK);
QCOMPARE(unknown.Get(), implementation.Get());
}
void tst_QComObject::QueryInterface_returnsConvertedPointer_whenDirectParentIsRequested()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
ComPtr<IDirect> direct;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IDirect), &direct);
// Assert
QCOMPARE(queryResult, S_OK);
QCOMPARE(direct.Get(), implementation.Get());
}
void tst_QComObject::QueryInterface_returnsConvertedPointer_whenDirectIntermediateIsRequested()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
ComPtr<IIntermediate> intermediate;
// Act
const HRESULT queryResult =
implementation->QueryInterface(__uuidof(IIntermediate), &intermediate);
// Assert
QCOMPARE(queryResult, S_OK);
QCOMPARE(intermediate.Get(), implementation.Get());
}
void tst_QComObject::
QueryInterface_returnsConvertedPointer_whenIUnknownOfMultipleParentsIsRequested()
{
// Arrange
const ComPtr<MultipleComImplementation> implementation =
makeComObject<MultipleComImplementation>();
ComPtr<IUnknown> unknown;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IUnknown), &unknown);
// Assert
QCOMPARE(queryResult, S_OK);
// Cast MultipleComImplementation to IMultipleA to prevent ambiguity
QCOMPARE(unknown.Get(), static_cast<IMultipleA *>(implementation.Get()));
}
void tst_QComObject::QueryInterface_returnsConvertedPointer_whenFirstOfMultipleParentsIsRequested()
{
// Arrange
const ComPtr<MultipleComImplementation> implementation =
makeComObject<MultipleComImplementation>();
ComPtr<IMultipleA> multiple;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IMultipleA), &multiple);
// Assert
QCOMPARE(queryResult, S_OK);
QCOMPARE(multiple.Get(), implementation.Get());
}
void tst_QComObject::QueryInterface_returnsConvertedPointer_whenSecondOfMultipleParentsIsRequested()
{
// Arrange
const ComPtr<MultipleComImplementation> implementation =
makeComObject<MultipleComImplementation>();
ComPtr<IMultipleB> multiple;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IMultipleB), &multiple);
// Assert
QCOMPARE(queryResult, S_OK);
QCOMPARE(multiple.Get(), implementation.Get());
}
void tst_QComObject::QueryInterface_returnsNullPointer_whenNonParentIsRequested()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
ComPtr<IOther> other;
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IOther), &other);
// Assert
QCOMPARE(queryResult, E_NOINTERFACE);
QCOMPARE(other.Get(), nullptr);
}
void tst_QComObject::QueryInterface_returnsNullPointer_whenNullPointerIsPassedForReceivingObject()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
// Act
const HRESULT queryResult = implementation->QueryInterface(__uuidof(IUnknown), nullptr);
// Assert
QCOMPARE(queryResult, E_POINTER);
}
void tst_QComObject::QueryInterface_incrementsReferenceCount_whenConvertedPointerIsReturned()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
ComPtr<IUnknown> unknown;
// Act
implementation->QueryInterface(__uuidof(IUnknown), &unknown);
// As there's no any way to get the current reference count of an object, just add one more
// reference and assert against cumulative reference count value
const ULONG referenceCount = implementation->AddRef();
// Assert
QCOMPARE(referenceCount, 3);
}
void tst_QComObject::AddRef_incrementsReferenceCountByOne()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
// Act
const ULONG referenceCount1 = implementation->AddRef();
const ULONG referenceCount2 = implementation->AddRef();
// Assert
QCOMPARE(referenceCount1, 2);
QCOMPARE(referenceCount2, 3);
}
void tst_QComObject::Release_decrementsReferenceCountByOne()
{
// Arrange
const ComPtr<ComImplementation> implementation = makeComObject<ComImplementation>();
implementation->AddRef();
implementation->AddRef();
// Act
const ULONG referenceCount1 = implementation->Release();
const ULONG referenceCount2 = implementation->Release();
// Assert
QCOMPARE(referenceCount1, 2);
QCOMPARE(referenceCount2, 1);
}
QTEST_MAIN(tst_QComObject)
# include "tst_qcomobject.moc"
QT_END_NAMESPACE
#endif // Q_OS_WIN
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