RegCreateKeyEX returns ERROR_INVALID_FUNCTION - c++

Question

I am writing a program that needs to create/delete a registry key. I am having a problem that the code to create the key returns ERROR_INVALID_FUNCTION.
If you look in the registry the key has been created so I'm not sure what the impact of this error is.
The value of key is "SOFTWARE\\Wow6432Node\\COMPANY\\APPLICATION"
The code is:
int RegistryViewer::CreateRegistryLocation(const char* key)
{
HKEY hkey = 0;
int retVal = RegistryViewer::OpenRegistryLocation(key);
if(retVal != ERROR_SUCCESS)
{
retVal = RegCreateKeyEx(HKEY_LOCAL_MACHINE, CString(key), 0, NULL,REG_OPTION_NON_VOLATILE, KEY_WOW64_32KEY | KEY_WRITE, NULL, &hkey, NULL);
RegCloseKey(hkey);
}
return retVal;
}
Is the problem that although the key is created, it's unable to set the permissions correctly?
Thanks.

Answer 1

Going to answer my own question in case it's helpful to others in future. I think I had two problems that were limiting access to the registry key, firstly I was opening it twice (once to see it existed and then when it was created), secondly I was assigning it KEY_WRITE permissions. Since RegCreateKeyEx opens a key if it already exists the first check was pointless and may have been holding the resource. I'm not sure the second thing was a problem but since it's changed in the code I thought I'd mention it.
Working code looks like this:
//Create a registry location
int RegistryViewer::CreateRegistryLocation(const char* key)
{
HKEY hkey = 0;
int retVal = RegCreateKeyEx(HKEY_LOCAL_MACHINE, CString(key), 0, NULL, REG_OPTION_NON_VOLATILE, KEY_WOW64_32KEY | KEY_ALL_ACCESS, NULL, &hkey, NULL);
if(retVal == ERROR_SUCCESS)
RegCloseKey(hkey);
return retVal;
}
The comment by eryksun was useful for another issue though as I was manually checking which part of the registry to use and he enabled me to remove that check.