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WinAPI字符及字符串函数(1)

2008-11-14 
CharLower-字符或字符串转小写

    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;
  Button5: TButton;
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  procedure Button3Click(Sender: TObject);
  procedure Button4Click(Sender: TObject);
  procedure Button5Click(Sender: TObject);
  end;
  var
  Form1: TForm1;
  implementation
  {$R *.dfm}
  {对字符}
  procedure TForm1.Button1Click(Sender: TObject);
  var
  C: Char;
  begin
  C := 'A';
  C := Char(CharLower(PChar(C)));
  ShowMessage(C); {a}
  end;
  {对字符常量}
  procedure TForm1.Button2Click(Sender: TObject);
  var
  C: Char;
  begin
  C := Char(CharLower(PChar('A')));
  ShowMessage(C); {a}
  end;
  {对字符数组}
  procedure TForm1.Button3Click(Sender: TObject);
  var
  Arr: array[0..2+1] of Char;
  begin
  Arr := 'ABC';
  CharLower(Arr);
  ShowMessage(Arr); {abc}
  end;
  {对字符串}
  procedure TForm1.Button4Click(Sender: TObject);
  var
  str: string;
  begin
  str := 'ABC';
  CharLower(@str[1]);
  ShowMessage(str); {abc}
  end;
  {Delphi 的 SysUtils.LowerCase}
  procedure TForm1.Button5Click(Sender: TObject);
  var
  str: string;
  begin
  str := 'ABC';
  str := LowerCase(str);
  ShowMessage(str); {abc}
  end;

 

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