RegCreateKey() ?

[mkyong]

Win32,i write the RegCreateKeyEx() function like this, it's working

HKEY hkey;
DWORD dwDisposition=0;
RegCreateKeyEx(HKEY_CLASSES_ROOT,"NewApp",0,"",REG _OPTION_VOLATILE,KEY_ALL_ACCESS,NULL,
&hkey,&dwDisposition);


MFC, i write the RegCreateKeyEx() function like below, no error but just can't create a key in registry, why?

HKEY hkey;
DWORD dwDisposition=0;
::RegCreateKeyEx(HKEY_CLASSES_ROOT,"NewApp",0,"",R EG_OPTION_VOLATILE,KEY_ALL_ACCESS,NULL,
&hkey,&dwDisposition);


in addtion, what is the different beyween these two statement in MFC
RegCreateKeyEx(...);
::RegCreateKeyEx(...);

[adrianxw]

What value is RegCreateKeyEx() returning? If the call works, it returns ERROR_SUCCESS, (defined in winerror.h), otherwise it returns another value from the same header.

I don't use MFC, but in this context, (MFC), I believe using the scope resolution operator, (::), tells the compiler you want to use the standard API function rather than any member function of a class. That being the case, the two calls should be the same.

[master5001]

Indeed :: indicates that you are taking a function from the global scope. And your call to RegCreateKeyEx() looks good enough. But just for the hell of it why not try

 HKEY hkey;
SECURITY_ATTRIBUTES sAttribs = {sizeof(SECURITY_ATTRIBUTES)};
DWORD dwDisposition=0;
RegCreateKeyEx(HKEY_CLASSES_ROOT,"NewApp",0,"",REG_OPTION_VOLATILE,KEY_ALL_ACCESS, &sAttribs, &hkey,&dwDisposition);