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RegOpenCurrentUser function

Retrieves a handle to the HKEY_CURRENT_USER key for the user the current thread is impersonating.


LONG WINAPI RegOpenCurrentUser(
  _In_  REGSAM samDesired,
  _Out_ PHKEY  phkResult


samDesired [in]

A mask that specifies the desired access rights to the key. The function fails if the security descriptor of the key does not permit the requested access for the calling process. For more information, see Registry Key Security and Access Rights.

phkResult [out]

A pointer to a variable that receives a handle to the opened key. When you no longer need the returned handle, call the RegCloseKey function to close it.

Return value

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is a nonzero error code defined in Winerror.h. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.


The HKEY_CURRENT_USER key maps to the root of the current user's branch in the HKEY_USERS key. It is cached for all threads in a process. Therefore, this value does not change when another user's profile is loaded. RegOpenCurrentUser uses the thread's token to access the appropriate key, or the default if the profile is not loaded.


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]


Winreg.h (include Windows.h)





See also

Registry Functions
Registry Overview