解决方法
正如@Uwe在评论中提到的,您可以使用
EnumSystemGeoID和
GetGeoInfo功能.原则是,使用
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一个.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);
if BufferLen <> 0 then
begin
SetLength(Buffer,BufferLen);
Result := GetGeoInfo(GeoId,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),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;