Function EnumPrinterDataExA 

pub unsafe fn EnumPrinterDataExA<P1>(
    hprinter: PRINTER_HANDLE,
    pkeyname: P1,
    penumvalues: Option<&mut [u8]>,
    pcbenumvalues: *mut u32,
    pnenumvalues: *mut u32,
) -> u32
where
    P1: Param<PCSTR>,