Delphi调用WinAPI 字符及字符串函数(3)

CharUpper - 字符或字符串转大写

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;
　　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(CharUpper(PChar(C)));
　ShowMessage(C); {A}
end;

{对字符常量}

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