Delphi調用WinAPI 字符及字符串函數(3)

CharUpper - 字符或字符串轉大寫

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;
　　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}

{對字符}

procedure TForm1.Button1Click(Sender: TObject);
var
　C: Char;
begin
　C := 'a';
　C := Char(CharUpper(PChar(C)));
　ShowMessage(C); {A}
end;

{對字符常量}

procedure TForm1.Button2Click(Sender: TObject);
var
　C: Char;
begin
　C := Char(CharUpper(PChar('a')));
　ShowMessage(C); {A}
end;

{對字符數組}

procedure TForm1.Button3Click(Sender: TObject);
var
　Arr: array[0..2+1] of Char;
begin
　Arr := 'abc';
　CharUpper(Arr);
　ShowMessage(Arr); {ABC}
end;

{對字符串}procedure TForm1.Button4Click(Sender: TObject);
var
　str: string;
begin
　str := 'abc';
　CharUpper(@str[1]);
　ShowMessage(str); {ABC}
end;

{Delphi 的 System.UpCase 和 SysUtils.LowerCase}

procedure TForm1.Button5Click(Sender: TObject);
var
　c: Char;
　str: string;
begin
　c := 'a';
　c := UpCase(c);
　str := 'abc';
　str := UpperCase(str);
　ShowMessageFmt('%s, %s', [c, str]); {A, ABC}
end;