现有一套软件功能基本已经齐全，现在想增加一功能：多语言，请问应怎么设计？

Question

就是在原system菜单上加一个language：English,Italy,French...的菜单，当点击english，界面就显示english，其他的相同，请问如何设计？

Answer 1

我这边有一套成熟的方案，用了很久
1.定义一个全系统的基类Form（如果有的话，就在你的基类form中写）
2.将需要读取的标题信息都防到ini中(每一种语言一种ini)
3.procedure TfBase.pdReadCaptions(Sender:TControl;Const aHeader:String);
var
   lnComp,i:Integer;
   Inifile:Tinifile;
begin
  try
    Inifile:=Tinifile.Create(g_StrFileName);
    if Sender=Self then
    begin
      Caption:=Inifile.ReadString(aHeader,'Caption',Caption);
      Font.Size:=s_nFontSize;
      Font.Name:=s_StrFontName;
      ParentFont:=True;
    end;    //
    with TControl(Sender) do
    for lnComp:=0 to ComponentCount-1 do
    begin 
       if (Components[lnComp] is TCommonDialog)  then
        Continue;      //Panel
      if  (Components[lnComp] is TPanel) then
      begin
        TPanel(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TPanel(Components[lnComp]).Name,'');
        TPanel(Components[lnComp]).Font.Size:=s_nFontSize;
        TPanel(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;      //DbCheckBox
      if (Components[lnComp] is TDbCheckBox) then
      begin
        TDbCheckBox(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TDbCheckBox(Components[lnComp]).Name,'');
        TDbCheckBox(Components[lnComp]).Font.Size:=s_nFontSize;
        TDbCheckBox(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;      //Button
      if (Components[lnComp] is TButton)  then
      begin
        TButton(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TButton(Components[lnComp]).Font.Size:=s_nFontSize;
        TButton(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //CheckBox
      if  (Components[lnComp] is TCheckBox) then
      begin
        TCheckBox(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TCheckBox(Components[lnComp]).Font.Size:=s_nFontSize;
        TCheckBox(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //GroupBox
      if  (Components[lnComp] is TGroupBox) then
      begin
         TGroupBox(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
         TGroupBox(Components[lnComp]).Font.Size:=s_nFontSize;
         TGroupBox(Components[lnComp]).Font.Name:=s_StrFontName;
         continue;
      end;
      //RadioButton
      if  (Components[lnComp] is TRadioGroup) then
      begin
        TRadioGroup(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        Continue;
      end;
      //SpeedButton
      if  (Components[lnComp] is TSpeedButton) then
      begin
        TSpeedButton(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TSpeedButton(Components[lnComp]).Font.Size:=s_nFontSize;
        TSpeedButton(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //StaticText
      if  (Components[lnComp] is TStaticText) then
      begin
        TStaticText(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TStaticText(Components[lnComp]).Font.Size:=s_nFontSize;
        TStaticText(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //LabeledEdit
      if  (Components[lnComp] is TLabeledEdit ) then
      begin
        TLabeledEdit(Components[lnComp]).EditLabel.Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        
        Continue;
      end;
      //MenuItem
      if  (Components[lnComp] is TMenuItem) then
      begin
        TMenuItem(Components[lnComp]).Caption:=Inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        Continue;
      end;
      //Label
      if  (Components[lnComp] is TLabel )  then
      begin
        TLabel(Components[lnComp]).Caption:=inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TLabel(Components[lnComp]).Font.Size:=s_nFontSize;
        TLabel(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //TabSheet
      if (Components[lnComp] is TTabSheet) then
      begin
        TTabSheet(Components[lnComp]).Caption:=inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TTabSheet(Components[lnComp]).Font.Size:=s_nFontSize;
        TTabSheet(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;
      //RadioButton
      if (Components[lnComp] is TRadioButton) then
      begin
        TRadioButton(Components[lnComp]).Caption:=inifile.ReadString(aHeader,TControl(Components[lnComp]).Name,'');
        TRadioButton(Components[lnComp]).Font.Size:=s_nFontSize;
        TRadioButton(Components[lnComp]).Font.Name:=s_StrFontName;
        Continue;
      end;      //Frame 框架里的东西
      if (Components[lnComp]) is TFrame then
      for i:=0 to  TFrame(Components[lnComp]).ComponentCount-1 do
        pdReadCaptions(TFrame(Components[lnComp]),Copy(TFrame(Components[lnComp]).ClassName,2,length(TFrame(Components[lnComp]).ClassName)));
      //
    end;
  finally
    Inifile.Free;
  end;
end;

Answer 2

To:wycg_cnh20(伤心郁闷中) 
   悄悄的问你个问题，全系统的基类应该怎么定义啊

Answer 3

就是你的整个工程中的form都继承自它。
这样的话，你可能没一个Form的申明部门都要改动
TYourForm=Class(TForm)====>>>> TYourForm=Class(TBaseForm)你给我一个邮箱，Ok

Answer 4

DELPHI里有个多语言DLL,在工程向导里有

Answer 5

看看这套元件
www.acroprise.com.tw
把元件放到主画面，不用修改你别的form的代码,就可以增加任意语言支持了。