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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(2)

Delphi調用WinAPI 字符及字符串函數(2)

編輯:Delphi

CharLowerBuff - 把緩沖區中指定數目的字符轉小寫

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;
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  procedure Button3Click(Sender: TObject);
  procedure Button4Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation

{$R *.dfm}

{對字符數組, 全部轉換}

procedure TForm1.Button1Click(Sender: TObject);
var
 buf: array[0..6] of Char;
begin
 buf := 'ABCDEFG';
 CharLowerBuff(buf, Length(buf));
 ShowMessage(buf); {abcdefg}
end;

{只轉換前 3}

procedure TForm1.Button2Click(Sender: TObject);
var
 buf: array[0..6] of Char;
begin
 buf := 'ABCDEFG';
 CharLowerBuff(buf, 3);
 ShowMessage(buf); {abcDEFG}
end;

{返回值}

procedure TForm1.Button3Click(Sender: TObject);
var
 buf: array[0..6] of Char;
 num: Integer;
begin
 buf := 'ABCDEFG';
 num := CharLowerBuff(buf, 4);
 ShowMessageFmt('%s, %d', [string(buf), num]); {abcdEFG, 4}
end;

{對字符串}

procedure TForm1.Button4Click(Sender: TObject);
var
 str: string;
begin
 str := 'ABCDEFG';
 CharLowerBuff(@str[1], Length(str));
 ShowMessage(str); {abcdefg}
end;

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