visual studio - C++ Get country code -

i'm trying country code (example: "uk" or "si" or "ger") via getgeoinfo().

    geoid getusergeoid(geoclass_nation); 

currently getting value 16 above function ^ looking in table there's no number 16.

https://msdn.microsoft.com/en-us/library/windows/desktop/dd374073(v=vs.85).aspx

i know it's 3-4 lines of code can't seem figure out on own. appriciated.

edit:

geoid mygeo = getusergeoid(geoclass_nation); int sizeofbuffer = getgeoinfo(mygeo, geo_iso2, null, 0, 0); wchar *buffer = new wchar[sizeofbuffer]; int result = getgeoinfo(mygeo, geo_iso2, buffer, sizeofbuffer, 0); 

got display country number don't know how i'd transform iso code.

to country iso:

geoid mygeo = getusergeoid(geoclass_nation); int sizeofbuffer = getgeoinfo(mygeo, geo_iso2, null, 0, 0); wchar *buffer = new wchar[sizeofbuffer]; int result = getgeoinfo(mygeo, geo_iso2, buffer, sizeofbuffer, 0); wcout<<buffer; 

thanks @christophe , @thomas.