Delphi 2009 新增单元 Character[1]: ToUpper、ToLower - 字符与字符串的大小写转换

代码文件:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses Character;



{Character.ToUpper}

procedure TForm1.Button1Click(Sender: TObject);

var

  c: Char;

  str: string;

begin

  c := ToUpper('a');

  str := ToUpper('Delphi');

  ShowMessageFmt('%s, %s', [c, str]); {A, DELPHI}

end;



{Character.ToLower}

procedure TForm1.Button2Click(Sender: TObject);

var

  c: Char;

  str: string;

begin

  c := ToLower('A');

  str := ToLower('Delphi');

  ShowMessageFmt('%s, %s', [c, str]); {a, delphi}

end;



{相应的 API 函数: Windows.CharUpper、Windows.CharLower}

procedure TForm1.Button3Click(Sender: TObject);

var

  c1,c2: Char;

begin

  c1 := Char(CharUpper(PChar('a')));

  c2 := Char(CharLower(PChar('B')));

  ShowMessageFmt('%s, %s', [c1, c2]); {A, b}

end;



{以前 SysUtils 下有: UpperCase、LowerCase}

procedure TForm1.Button4Click(Sender: TObject);

var

  s1,s2: string;

begin

  s1 := UpperCase('Delphi');

  s2 := LowerCase('Delphi');

  ShowMessageFmt('%s, %s', [s1, s2]); {DELPHI, delphi}

end;



end.


 
   

窗体文件:

---

object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 141

  ClientWidth = 251

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 88

    Top = 8

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object Button2: TButton

    Left = 88

    Top = 39

    Width = 75

    Height = 25

    Caption = 'Button2'

    TabOrder = 1

    OnClick = Button2Click

  end

  object Button3: TButton

    Left = 88

    Top = 70

    Width = 75

    Height = 25

    Caption = 'Button3'

    TabOrder = 2

    OnClick = Button3Click

  end

  object Button4: TButton

    Left = 88

    Top = 101

    Width = 75

    Height = 25

    Caption = 'Button4'

    TabOrder = 3

    OnClick = Button4Click

  end

end