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39
40#ifndef QSYSTEMLIBRARY_P_H
41#define QSYSTEMLIBRARY_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/private/qglobal_p.h>
55#ifdef Q_OS_WIN
56# include <QtCore/qstring.h>
57# include <qt_windows.h>
58
59QT_BEGIN_NAMESPACE
60
61class QSystemLibrary
62{
63public:
64 explicit QSystemLibrary(const QString &libraryName)
65 {
66 m_libraryName = libraryName;
67 m_handle = 0;
68 m_didLoad = false;
69 }
70
71 explicit QSystemLibrary(const wchar_t *libraryName)
72 {
73 m_libraryName = QString::fromWCharArray(libraryName);
74 m_handle = 0;
75 m_didLoad = false;
76 }
77
78 bool load(bool onlySystemDirectory = true)
79 {
80 m_handle = load((const wchar_t *)m_libraryName.utf16(), onlySystemDirectory);
81 m_didLoad = true;
82 return (m_handle != 0);
83 }
84
85 bool isLoaded()
86 {
87 return (m_handle != 0);
88 }
89
90 QFunctionPointer resolve(const char *symbol)
91 {
92 if (!m_didLoad)
93 load();
94 if (!m_handle)
95 return 0;
96 return QFunctionPointer(GetProcAddress(m_handle, symbol));
97 }
98
99 static QFunctionPointer resolve(const QString &libraryName, const char *symbol)
100 {
101 return QSystemLibrary(libraryName).resolve(symbol);
102 }
103
104 static Q_CORE_EXPORT HINSTANCE load(const wchar_t *lpFileName, bool onlySystemDirectory = true);
105private:
106 HINSTANCE m_handle;
107 QString m_libraryName;
108 bool m_didLoad;
109};
110
111QT_END_NAMESPACE
112
113#endif //Q_OS_WIN
114
115#endif //QSYSTEMLIBRARY_P_H
116

source code of qtbase/src/corelib/plugin/qsystemlibrary_p.h