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39
40#ifndef QSHAREDMEMORY_H
41#define QSHAREDMEMORY_H
42
43#include <QtCore/qglobal.h>
44#ifndef QT_NO_QOBJECT
45# include <QtCore/qobject.h>
46#else
47# include <QtCore/qobjectdefs.h>
48# include <QtCore/qscopedpointer.h>
49# include <QtCore/qstring.h>
50#endif
51QT_BEGIN_NAMESPACE
52
53
54#ifndef QT_NO_SHAREDMEMORY
55
56class QSharedMemoryPrivate;
57
58class Q_CORE_EXPORT QSharedMemory
59#ifndef QT_NO_QOBJECT
60 : public QObject
61#endif
62{
63#ifndef QT_NO_QOBJECT
64 Q_OBJECT
65#endif
66 Q_DECLARE_PRIVATE(QSharedMemory)
67
68public:
69 enum AccessMode
70 {
71 ReadOnly,
72 ReadWrite
73 };
74
75 enum SharedMemoryError
76 {
77 NoError,
78 PermissionDenied,
79 InvalidSize,
80 KeyError,
81 AlreadyExists,
82 NotFound,
83 LockError,
84 OutOfResources,
85 UnknownError
86 };
87
88#ifndef QT_NO_QOBJECT
89 QSharedMemory(QObject *parent = nullptr);
90 QSharedMemory(const QString &key, QObject *parent = nullptr);
91#else
92 QSharedMemory();
93 QSharedMemory(const QString &key);
94 static QString tr(const char * str)
95 {
96 return QString::fromLatin1(str);
97 }
98#endif
99 ~QSharedMemory();
100
101 void setKey(const QString &key);
102 QString key() const;
103 void setNativeKey(const QString &key);
104 QString nativeKey() const;
105
106 bool create(int size, AccessMode mode = ReadWrite);
107 int size() const;
108
109 bool attach(AccessMode mode = ReadWrite);
110 bool isAttached() const;
111 bool detach();
112
113 void *data();
114 const void* constData() const;
115 const void *data() const;
116
117#ifndef QT_NO_SYSTEMSEMAPHORE
118 bool lock();
119 bool unlock();
120#endif
121
122 SharedMemoryError error() const;
123 QString errorString() const;
124
125private:
126 Q_DISABLE_COPY(QSharedMemory)
127#ifdef QT_NO_QOBJECT
128 QScopedPointer<QSharedMemoryPrivate> d_ptr;
129#endif
130};
131
132#endif // QT_NO_SHAREDMEMORY
133
134QT_END_NAMESPACE
135
136#endif // QSHAREDMEMORY_H
137
138

source code of qtbase/src/corelib/kernel/qsharedmemory.h