QHash with key and struct problem

[MarkoSan]

Well, is it possible to get value of key if there is a value known from QHash?

Ok, that was another stupid question, it is all in docs ... there is a key() method ...

But, following method:

inline qint16 merchandiseId(const QString& strKey) const
        { return m_strNames.key(strKey).iLanguageId; };

inline qint16 merchandiseId(const QString& strKey) const
        { return m_strNames.key(strKey).iLanguageId; };

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produces following errors:

In file included from CMerchandizeElement.cpp:8:
CMerchandizeElement.h: In member function `qint16 CMerchandizeElement::merchandiseId(const QString&) const':
CMerchandizeElement.h:95: error: no matching function for call to `QHash<qint16, merchandiseLangStruct>::key(const QString&) const'
c:/Qt/4.4.3/include/QtCore/../../src/corelib/tools/qhash.h:652: note: candidates are: const Key QHash<K, V>::key(const T&) const [with Key = qint16, T = merchandiseLangStruct]
c:/Qt/4.4.3/include/QtCore/../../src/corelib/tools/qhash.h:658: note:                 const Key QHash<K, V>::key(const T&, const Key&) const [with Key = qint16, T = merchandiseLangStruct]
mingw32-make[1]: *** [debug/CMerchandizeElement.o] Error 1
mingw32-make: *** [debug] Error 2

In file included from CMerchandizeElement.cpp:8:
CMerchandizeElement.h: In member function `qint16 CMerchandizeElement::merchandiseId(const QString&) const':
CMerchandizeElement.h:95: error: no matching function for call to `QHash<qint16, merchandiseLangStruct>::key(const QString&) const'
c:/Qt/4.4.3/include/QtCore/../../src/corelib/tools/qhash.h:652: note: candidates are: const Key QHash<K, V>::key(const T&) const [with Key = qint16, T = merchandiseLangStruct]
c:/Qt/4.4.3/include/QtCore/../../src/corelib/tools/qhash.h:658: note:                 const Key QHash<K, V>::key(const T&, const Key&) const [with Key = qint16, T = merchandiseLangStruct]
mingw32-make[1]: *** [debug/CMerchandizeElement.o] Error 1
mingw32-make: *** [debug] Error 2

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Can someone help me please?