Function MsiEnumComponentsExA 

pub unsafe extern "system" fn MsiEnumComponentsExA(
    szusersid: PCSTR,
    dwcontext: u32,
    dwindex: u32,
    szinstalledcomponentcode: PSTR,
    pdwinstalledcontext: *mut MSIINSTALLCONTEXT,
    szsid: PSTR,
    pcchsid: *mut u32,
) -> u32