qt-everywhere-src-5.14.1/qtbase/src/corelib/plugin/qsystemlibrary_p.h

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#ifndef QSYSTEMLIBRARY_P_H
#define QSYSTEMLIBRARY_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/private/qglobal_p.h>
#ifdef Q_OS_WIN
#  include <QtCore/qstring.h>
#  include <qt_windows.h>

QT_BEGIN_NAMESPACE

class QSystemLibrary
{
public:
    explicit QSystemLibrary(const QString &libraryName)
    {
        m_libraryName = libraryName;
        m_handle = 0;
        m_didLoad = false;
    }

    explicit QSystemLibrary(const wchar_t *libraryName)
    {
        m_libraryName = QString::fromWCharArray(libraryName);
        m_handle = 0;
        m_didLoad = false;
    }

    bool load(bool onlySystemDirectory = true)
    {
        m_handle = load((const wchar_t *)m_libraryName.utf16(), onlySystemDirectory);
        m_didLoad = true;
        return (m_handle != 0);
    }

    bool isLoaded()
    {
        return (m_handle != 0);
    }

    QFunctionPointer resolve(const char *symbol)
    {
        if (!m_didLoad)
            load();
        if (!m_handle)
            return 0;
        return QFunctionPointer(GetProcAddress(m_handle, symbol));
    }

    static QFunctionPointer resolve(const QString &libraryName, const char *symbol)
    {
        return QSystemLibrary(libraryName).resolve(symbol);
    }

    static Q_CORE_EXPORT HINSTANCE load(const wchar_t *lpFileName, bool onlySystemDirectory = true);
private:
    HINSTANCE m_handle;
    QString m_libraryName;
    bool m_didLoad;
};

QT_END_NAMESPACE

#endif  //Q_OS_WIN

#endif  //QSYSTEMLIBRARY_P_H