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  • WinAPI 字符及字符串函数(1): CharLower 字符或字符串转小写

    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;
        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}
    
    {对字符}
    procedure TForm1.Button1Click(Sender: TObject);
    var
      C: Char;
    begin
      C := 'A';
      C := Char(CharLower(PChar(C)));
      ShowMessage(C); {a}
    end;
    
    {对字符常量}
    procedure TForm1.Button2Click(Sender: TObject);
    var
      C: Char;
    begin
      C := Char(CharLower(PChar('A')));
      ShowMessage(C); {a}
    end;
    
    {对字符数组}
    procedure TForm1.Button3Click(Sender: TObject);
    var
      Arr: array[0..2+1] of Char;
    begin
      Arr := 'ABC';
      CharLower(Arr);
      ShowMessage(Arr); {abc}
    end;
    
    {对字符串}
    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;
    
    end.
    
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  • 原文地址:https://www.cnblogs.com/del/p/1327122.html
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