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@KillyMXI
Last active Mar 28, 2021
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GetGeoInfoEx C# example
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Runtime.InteropServices;
namespace GeoInfoService
{
public static class GeoInfoService
{
private static readonly Dictionary<string, (string EnglishName, int GeoId, string ISO2Code, string ISO3Code)> _regionCodeMapping
= CultureInfo.GetCultures(CultureTypes.SpecificCultures)
.Select(ci => new RegionInfo(ci.LCID))
.GroupBy(ri => ri.TwoLetterISORegionName)
.ToDictionary(
g => g.Key,
g => g.First().Transform(x => (x.EnglishName, x.GeoId, x.TwoLetterISORegionName, x.ThreeLetterISORegionName))
);
public static string GetFriendlyName(string code)
=> _regionCodeMapping[code].EnglishName;
public enum SYSGEOTYPE
{
GEO_NATION = 0x0001,
GEO_LATITUDE,
GEO_LONGITUDE,
GEO_ISO2,
GEO_ISO3,
GEO_RFC1766,
GEO_LCID,
GEO_FRIENDLYNAME,
GEO_OFFICIALNAME,
GEO_TIMEZONES,
GEO_OFFICIALLANGUAGES,
GEO_ISO_UN_NUMBER,
GEO_PARENT,
GEO_DIALINGCODE,
GEO_CURRENCYCODE,
GEO_CURRENCYSYMBOL,
GEO_NAME,
GEO_ID
}
public static string GetGeoInfoEx(string geoId, SYSGEOTYPE geoType)
{
switch (geoType)
{
case SYSGEOTYPE.GEO_NATION:
case SYSGEOTYPE.GEO_RFC1766:
case SYSGEOTYPE.GEO_LCID:
case SYSGEOTYPE.GEO_ID:
throw new Exception("Not supported");
case SYSGEOTYPE.GEO_TIMEZONES:
case SYSGEOTYPE.GEO_OFFICIALLANGUAGES:
throw new Exception("Not implemented in the system");
case SYSGEOTYPE.GEO_LATITUDE:
case SYSGEOTYPE.GEO_LONGITUDE:
case SYSGEOTYPE.GEO_ISO2:
case SYSGEOTYPE.GEO_ISO3:
case SYSGEOTYPE.GEO_FRIENDLYNAME:
case SYSGEOTYPE.GEO_OFFICIALNAME:
case SYSGEOTYPE.GEO_ISO_UN_NUMBER:
case SYSGEOTYPE.GEO_PARENT:
case SYSGEOTYPE.GEO_DIALINGCODE:
case SYSGEOTYPE.GEO_CURRENCYCODE:
case SYSGEOTYPE.GEO_CURRENCYSYMBOL:
case SYSGEOTYPE.GEO_NAME:
break;
default:
throw new Exception("Unexpected SYSGEOTYPE value");
}
string s = new string('\0', 256);
int size = GetGeoInfoEx(geoId, geoType, s, 256);
if (size <= 0) { return null; }
return s.Substring(0, size - 1);
}
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
private extern static int GetGeoInfoEx(string location, SYSGEOTYPE geoType, string geoData, int geoDataCount);
}
}
@KillyMXI
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KillyMXI commented Sep 5, 2019

At some point I was looking into using CultureInfo or GetGeoInfoEx to get some information based on country code.
I opted for a different solution since then, but I decided to dump this here in case I will ever need something like this.

This code is not quite complete. I discarded it before I was completely sure which types of information are actually supported.

As for the solution I decided to use: there are multiple projects on GitHub, trying to provide country information, all without much support and with some inconveniences and errors. I patched some of them for my needs. I might even publish my (N+1)th project too at some point.

If I find a way to generate an accurate code from some open geo-informational system - that will be the way to go.

That's the appeal of this Gist - it relies on sources maintained by someone else and expected to have certain level of quality. Although they happen to have no information I was after.

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