Function EnumPrinterDataExA 

pub unsafe extern "system" fn EnumPrinterDataExA(
    hprinter: PRINTER_HANDLE,
    pkeyname: PCSTR,
    penumvalues: *mut u8,
    cbenumvalues: u32,
    pcbenumvalues: *mut u32,
    pnenumvalues: *mut u32,
) -> u32