Function RegEnumValueA
pub unsafe fn RegEnumValueA(
hkey: HKEY,
dwindex: u32,
lpvaluename: Option<PSTR>,
lpcchvaluename: *mut u32,
lpreserved: Option<*const u32>,
lptype: Option<*mut u32>,
lpdata: Option<*mut u8>,
lpcbdata: Option<*mut u32>,
) -> WIN32_ERROR