将ISO 3166-1 alpha-2国家/地区代码转换为本地化的国家/地区名称

Question

有没有办法在不使用外部资源的情况下将两个字母的国家代码转换为可读的国家代码？

例如DE -> Germany,AD -> Andorra

如果我可以选择目标语言或使用系统语言会很好,因为我想用德语.

Answer 1

正如@Uwe在评论中提到的,你可以使用EnumSystemGeoID和GetGeoInfo函数.原则是,通过EnumSystemGeoID函数,您将枚举地理位置标识符,并通过GetGeoInfo函数查询枚举标识符的ISO 2字母国家/地区代码(信息类型GEO_ISO2)是否等于您感兴趣的标识符.如果是这样,那么您可以使用相同的函数(友好名称(信息类型GEO_FRIENDLYNAME)或官方名称(信息类型GEO_OFFICIALNAME))查询此标识符,返回结果并停止枚举.

下面是一个示例代码,可能会这样做(遗憾的是,枚举函数不支持传递自定义数据,因此我使用了全局记录变量来传递值):

type
  TEnumData = record
    GeoCode: string;
    GeoName: string;
    Success: Boolean;
  end;

  GEOID = type LONG;
  GEOTYPE = type DWORD;
  GEOCLASS = type DWORD;

  SYSGEOTYPE = (
    GEO_NATION = $0001,
    GEO_LATITUDE = $0002,
    GEO_LONGITUDE = $0003,
    GEO_ISO2 = $0004,
    GEO_ISO3 = $0005,
    GEO_RFC1766 = $0006,
    GEO_LCID = $0007,
    GEO_FRIENDLYNAME= $0008,
    GEO_OFFICIALNAME= $0009,
    GEO_TIMEZONES = $000A,
    GEO_OFFICIALLANGUAGES = $000B,
    GEO_ISO_UN_NUMBER = $000C,
    GEO_PARENT = $000D
  );

  SYSGEOCLASS = (
    GEOCLASS_NATION = 16,
    GEOCLASS_REGION = 14,
    GEOCLASS_ALL = 0
  );

  GEO_ENUMPROC = function(GeoId: GEOID): BOOL; stdcall;

  function EnumSystemGeoID(GeoClass: GEOCLASS;
    ParentGeoId: GEOID; lpGeoEnumProc: GEO_ENUMPROC): BOOL; stdcall;
    external kernel32 name 'EnumSystemGeoID';
  function GetGeoInfo(Location: GEOID; GeoType: GEOTYPE;
    lpGeoData: LPTSTR; cchData: Integer; LangId: LANGID): Integer; stdcall;
    external kernel32 name {$IFDEF UNICODE}'GetGeoInfoW'{$ELSE}'GetGeoInfoA'{$ENDIF};

implementation

var
  // I have used this global variable due to a lack of user data parameter for the callback function
  EnumData: TEnumData;

function TryGetGeoInfo(GeoId: GEOID; GeoType: GEOTYPE; out Value: string): Boolean;
var
  Buffer: string;
  BufferLen: Integer;
begin
  Result := False;
  BufferLen := GetGeoInfo(GeoId, GeoType, LPTSTR(Buffer), 0, 0);
  if BufferLen <> 0 then
  begin
    SetLength(Buffer, BufferLen);
    Result := GetGeoInfo(GeoId, GeoType, LPTSTR(Buffer), BufferLen, 0) <> 0;
    if Result then
      Value := Trim(Buffer);
  end;
end;

function EnumGeoInfoProc(GeoId: GEOID): BOOL; stdcall;
var
  S: string;
begin
  Result := TryGetGeoInfo(GeoId, GEOTYPE(GEO_ISO2), S);
  if Result and (S = EnumData.GeoCode) then
  begin
    // stop the enumeration since we've found the country by its ISO code
    Result := False;
    // return the success flag and try to return the friendly name of the country to the
    // EnumData.GeoName record field; you can optionally query the GEO_OFFICIALNAME
    EnumData.Success := TryGetGeoInfo(GeoId, GEOTYPE(GEO_FRIENDLYNAME), EnumData.GeoName);
  end;
end;

function TryGetCountryNameByISO2(const Code: string; out Name: string): Boolean;
begin
  // here is the brainless part using global record variable (because the function used
  // here with its callback does not support passing user data); no, you cannot tune it
  // up by making the callback function nested
  EnumData.GeoCode := Code;
  EnumData.Success := False;

  if not EnumSystemGeoID(GEOCLASS(GEOCLASS_NATION), 0, EnumGeoInfoProc) then
    RaiseLastOSError;

  Result := EnumData.Success;
  if Result then
    Name := EnumData.GeoName;
end;

可能的用法:

var
  S: string;
begin
  if TryGetCountryNameByISO2('DE', S) then
    ShowMessage(S);
end;