Call this method to open the specified key and set m_hKey to the handle of this key.
REGSAM samDesired = KEY_READ | KEY_WRITE
) throw( );
The handle of an open key.
Specifies the name of a key to be created or opened. This name must be a subkey of hKeyParent.
The security access for the key. The default value is KEY_ALL_ACCESS. For a list of possible values and descriptions, see RegCreateKeyEx in the Windows SDK.
If successful, returns ERROR_SUCCESS; otherwise, a non-zero error value defined in WINERROR.H.
If the lpszKeyName parameter is NULL or points to an empty string, Open opens a new handle of the key identified by hKeyParent, but does not close any previously opened handle.
Unlike CRegKey::Create, Open will not create the specified key if it does not exist.
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