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  • WinAPI 字符及字符串函数(2): CharLowerBuff 把缓冲区中指定数目的字符转小写

    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;
        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;
    
    end.
    
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  • 原文地址:https://www.cnblogs.com/del/p/1327245.html
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