blob: 04d4dc51cf85ad8eb054376996bf69236a5762f4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QWINDOWSCOMBASE_H
#define QWINDOWSCOMBASE_H
#include <QtCore/qglobal.h>
#include <unknwn.h>
QT_BEGIN_NAMESPACE
// The __uuidof operator of MinGW does not work for all interfaces (for example,
// IAccessible2). Specializations of this function can be provides to work
// around this.
template <class DesiredInterface>
static IID qUuidOf() { return __uuidof(DesiredInterface); }
// Helper for implementing IUnknown::QueryInterface.
template <class DesiredInterface, class Derived>
bool qWindowsComQueryInterface(Derived *d, REFIID id, LPVOID *iface)
{
if (id == qUuidOf<DesiredInterface>()) {
*iface = static_cast<DesiredInterface *>(d);
d->AddRef();
return true;
}
return false;
}
// Helper for implementing IUnknown::QueryInterface for IUnknown
// in the case of multiple inheritance via the first inherited class.
template <class FirstInheritedInterface, class Derived>
bool qWindowsComQueryUnknownInterfaceMulti(Derived *d, REFIID id, LPVOID *iface)
{
if (id == __uuidof(IUnknown)) {
*iface = static_cast<FirstInheritedInterface *>(d);
d->AddRef();
return true;
}
return false;
}
// Helper base class to provide IUnknown methods for COM classes (single inheritance)
template <class ComInterface> class QWindowsComBase : public ComInterface
{
Q_DISABLE_COPY_MOVE(QWindowsComBase)
public:
explicit QWindowsComBase(ULONG initialRefCount = 1) : m_ref(initialRefCount) {}
virtual ~QWindowsComBase() = default;
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id, LPVOID *iface) override
{
*iface = nullptr;
return qWindowsComQueryInterface<IUnknown>(this, id, iface) || qWindowsComQueryInterface<ComInterface>(this, id, iface)
? S_OK : E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef() override { return ++m_ref; }
ULONG STDMETHODCALLTYPE Release() override
{
if (!--m_ref) {
delete this;
return 0;
}
return m_ref;
}
private:
ULONG m_ref;
};
// Clang does not consider __declspec(nothrow) as nothrow
QT_WARNING_DISABLE_CLANG("-Wmicrosoft-exception-spec")
QT_WARNING_DISABLE_CLANG("-Wmissing-exception-spec")
QT_END_NAMESPACE
#endif // QWINDOWSCOMBASE_H
|
