WinAPI 字符及字符串函数(4): CharUpperBuff - 把缓冲区中指定数目的字符转大写

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;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);



  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



{对字符数组, 全部转换}

procedure TForm1.Button1Click(Sender: TObject);

var

  buf: array[0..6] of Char;

begin

  buf := 'abcdefg';

  CharUpperBuff(buf, Length(buf));



  ShowMessage(buf); {ABCDEFG}

end;



{只转换前 3}

procedure TForm1.Button2Click(Sender: TObject);

var

  buf: array[0..6] of Char;

begin

  buf := 'abcdefg';

  CharUpperBuff(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 := CharUpperBuff(buf, 4);



  ShowMessageFmt('%s, %d', [string(buf), num]); {ABCDefg, 4}

end;



{对字符串}

procedure TForm1.Button4Click(Sender: TObject);

var

  str: string;

begin

  str := 'abcdefg';

  CharUpperBuff(@str[1], Length(str));

  ShowMessage(str); {ABCDEFG}

end;



end.