The code below explains how to choose the default UI language depending on the Windows settings.
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function GetSystemLanguage(var Language, Region: String): Boolean;
var
Buf: String;
Len: Integer;
begin
// Locale name format: Language[-[Script-]Region]
Result := False;
SetLength(Buf, LOCALE_NAME_MAX_LENGTH);
Len := GetUserDefaultLocaleName(PChar(Buf), LOCALE_NAME_MAX_LENGTH);
if Len = 0 then
exit;
SetLength(Buf, Len-1);
Len := Pos('-', Buf);
if Len > 0 then
begin
Language := Copy(Buf, 1, Len-1);
Region := Copy(Buf, Len+1, MaxInt);
end
else
begin
Language := Buf;
Region := '';
end;
if Region <> '' then
begin
Len := Pos('-', Region);
if Len > 0 then
Region := Copy(Region, 1, Len-1);
end;
Result := True;
end;
function GetDefaultRVALanguage: TRVALanguageName;
var
Lan, Reg: String;
begin
Result := 'English (US)';
if not GetSystemLanguage(Lan, Reg) then
exit;
if Lan = 'be' then Result := 'Byelorussian'
else if Lan = 'bg' then Result := 'Bulgarian'
else if Lan = 'ca' then Result := 'Catalan'
else if Lan = 'cs' then Result := 'Czech'
else if Lan = 'da' then Result := 'Danish'
else if Lan = 'de' then Result := 'German'
else if Lan = 'es' then Result := 'Spanish'
else if Lan = 'fa' then Result := 'Farsi'
else if Lan = 'fi' then Result := 'Finnish'
else if Lan = 'fr' then Result := 'French'
else if Lan = 'hi' then Result := 'Hindi' // only for D2009+ or TNT
else if Lan = 'hy' then Result := 'Armenian' // only for D2009+ or TNT
else if Lan = 'hu' then Result := 'Hungarian'
else if Lan = 'it' then Result := 'Italian'
else if Lan = 'ja' then Result := 'Japanese'
else if Lan = 'ko' then Result := 'Korean'
else if Lan = 'lt' then Result := 'Lithuanian'
else if Lan = 'ms' then Result := 'Malay'
else if Lan = 'nb' then Result := 'Norwegian'
else if Lan = 'nl' then Result := 'Dutch (NL)'
else if Lan = 'pl' then Result := 'Polish'
else if Lan = 'pt' then
begin
if Reg = 'PT' then
Result := 'Portuguese (Portuguese)'
else
Result := 'Portuguese (Brazilian)'
end
else if Lan = 'ro' then Result := 'Romanian'
else if Lan = 'ru' then Result := 'Russian'
else if Lan = 'sk' then Result := 'Slovak'
else if Lan = 'sw' then Result := 'Swedish'
else if Lan = 'th' then Result := 'Thai'
else if Lan = 'tr' then Result := 'Turkish'
else if Lan = 'uk' then Result := 'Ukrainian'
else if Lan = 'zh' then
begin
if Reg = 'CN' then
Result := 'Chinese (Simplified)'
else
Result := 'Chinese (Big5)'
end;
end;Let we have a form that uses the actions and contains RVAControlPanel1: TRVAControlPanel
(normally, you should have a single TRVAControlPanel in your application, it becomes default).
When this form is created, assign:
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RVAControlPanel1.Language := GetDefaultRVALanguage;