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WinAPI字符及字符串函数(2)

2008-11-15 
CharLowerBuff-把缓冲区中指定数目的字符转小写

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

 

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