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Listing 2 Using the RegOpenKey() and RegOpenKeyEx() functions

#include <windows.h>

#if !defined(WIN32) && \
    !defined(_WIN32)
#include <shellapi.h>
#endif /* Win16 */


#if defined(WIN32) || \
    defined(_WIN32)
inline HKEY RegKeyDup(HKEY hkey, REGSAM samDesired = KEY_ALL_ACCESS)
{
    HKEY    hkeyDup;
    LONG    res = ::RegOpenKeyEx(hkey, NULL, 0, samDesired, &hkeyDup);

    if(res != ERROR_SUCCESS)
    {
        hkeyDup = NULL;
    }

    return hkeyDup;
}
#else
inline HKEY RegKeyDup(HKEY hkey)
{
    HKEY    hkeyDup;
    LONG    res = ::RegOpenKey(hkey, NULL, &hkeyDup);

    if(res != ERROR_SUCCESS)
    {
        hkeyDup = NULL;
    }

    return hkeyDup;
}
#endif /* Win32 */


int WINAPI WinMain( HINSTANCE   hinst,
                    HINSTANCE   hinstPrev,
                    LPSTR       lpszCmdLine,
                    int         nCmdShow)
{
    HKEY    hkey;
    HKEY    hkeyDup;
    LONG    lRes    =   ::RegOpenKey(HKEY_CLASSES_ROOT, ".cpp", &hkey);

    if(lRes == ERROR_SUCCESS)
    {
#if !defined(WIN32) && \
    !defined(_WIN32)
        char    value[260];
#else
        TCHAR   value[260];
#endif /* Win16 */
        LONG    cbValue;

        cbValue = sizeof(value);

        ::RegQueryValue(hkey, NULL, value, &cbValue);

        ::MessageBox(NULL, value, "Value from RegOpenKey()", MB_OK);

        hkeyDup = RegKeyDup(hkey);

        ::RegCloseKey(hkey);

        value[0] = '\0';
        ::RegQueryValue(hkeyDup, NULL, value, &cbValue);

        ::MessageBox(NULL, value, "Value from RegKeyDup()", MB_OK);

        ::RegCloseKey(hkeyDup);
    }

    return 0;
}

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