WinAPI字符及字符串函数(1)CharLower-字符或字符串转小写

WinAPI字符及字符串函数(1):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;

beginstr := 'ABC';

str := LowerCase(str);

ShowMessage(str); {abc}

end;

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