Function EnumPrinterDataExA 

pub unsafe extern "stdcall" fn EnumPrinterDataExA(
    hPrinter: HANDLE,
    pKeyName: LPCSTR,
    pEnumValues: LPBYTE,
    cbEnumValues: DWORD,
    pcbEnumValues: LPDWORD,
    pnEnumValues: LPDWORD,
) -> DWORD