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qtqt4registry

QString to TEXT()

I need to make a call like this

RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\MICROSOFT\\Windows NT\\CurrentVersion"), 0, KEY_READ | KEY_WOW64_64KEY, &m_hRegKey)

but instead of 

TEXT("SOFTWARE\\MICROSOFT\\Windows NT\\CurrentVersion")

i have only a qstring

i already tried 

QString key = settings.fileName() + settings.group();
RegOpenKeyEx(HKEY_LOCAL_MACHINE, key.toStdString().c_str(), 0, KEY_READ | KEY_WOW64_64KEY, &hkey);

but i get:

x.cpp:97: Fehler: cannot convert 'const char*' to 'LPCWSTR {aka const wchar_t*}' for argument '2' to 'LONG RegOpenKeyExW(HKEY, LPCWSTR, DWORD, REGSAM, PHKEY)'
     RegOpenKeyEx(HKEY_LOCAL_MACHINE, key.toStdString().c_str(), 0, KEY_READ | KEY_WOW64_64KEY, &hkey);

i need the RegOpenKeyEx because i need to read binary values from the registry

Solution

  • You were close : QString has a toStdWString() function, which returns a std::wstring instead of the std::string returned by toStdString().

    Then, call c_str() to get a const wchar_t*.