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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi調用WinAPI 字符及字符串函數(1)

Delphi調用WinAPI 字符及字符串函數(1)

編輯:Delphi

CharLower - 字符或字符串轉小寫

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}

{對字符}

procedure TForm1.Button1Click(Sender: TObject);
var
 C: Char;
begin
 C := 'A';
 C := Char(CharLower(PChar(C)));
 ShowMessage(C); {a}
end;

{對字符常量}

procedure TForm1.Button2Click(Sender: TObject);
var
 C: Char;
begin
 C := Char(CharLower(PChar('A')));
 ShowMessage(C); {a}
end;

{對字符數組}

procedure TForm1.Button3Click(Sender: TObject);
var
 Arr: array[0..2+1] of Char;
begin
 Arr := 'ABC';
 CharLower(Arr);
 ShowMessage(Arr); {abc}
end;

{對字符串}

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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