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RegUnLoadKey info  Overview  Group

The RegUnLoadKey function unloads the specified key and subkeys from the registry.

LONG RegUnLoadKey(

    HKEY hKey,

// handle of open key

    LPCTSTR lpSubKey 

// address of name of subkey to unload



Specifies the key to be unloaded. This can be a predefined reserved handle value, or a handle returned by a call to RegConnectRegistry. The predefined reserved handle values are:


Points to a null-terminated string containing the name of the subkey to be unloaded. The key referred to by the lpSubKey parameter must have been created by using the RegLoadKey function.

Return Values

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.


This function removes a hive from the registry but does not modify the file containing the registry information. A hive is a discrete body of keys, subkeys, and values that is rooted at the top of the registry hierarchy.

Windows NT: The calling process must have the SE_RESTORE_NAME privilege. For more information about privileges, see Privileges.

Windows 95: Security privileges are not supported or required.

See Also

RegConnectRegistry, RegDeleteKey, RegLoadKey, RegRestoreKey

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