CODEWITHSUNDEEP
c++windowsregistry
Sanich
Sanich

Reputation: 1835

Should the RegCloseKey() function only be used after a successful RegOpenKey() call, or unconditionally?

If I call RegOpenKeyEx(), do I have to RegCloseKey() the key regardless whether RegOpenKeyEx() succeeded, or only if RegOpenKeyEx() succeeded?

That is:

lRes = RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_READ, &hKey);

   if(lRes == ERROR_SUCCESS)
   {
       //doSomething
   }
   RegCloseKey(hKey);

or:

lRes = RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_READ, &hKey);

   if(lRes == ERROR_SUCCESS)
   {
       //doSomething
       ...
       RegCloseKey(hKey);
   }

What is the behavior in the first case? Is closing an unsuccessfully-opened key safe?

Thanks.

Upvotes: 1

Views: 3226

Answers (1)

Roger Rowland
Roger Rowland

Reputation: 26259

You should only close it if it opened successfully, otherwise the handle returned in the HKEY will be invalid (probably NULL).

Upvotes: 2

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