Delphi Win32核心API参考光盘源码 本书包含了常用的Windows API函数

				unit UPie;
				
				interface
				
				uses
				  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
				  StdCtrls;
				
				type
				  TForm1 = class(TForm)
				    procedure FormPaint(Sender: TObject);
				  private
				    { Private declarations }
				  public
				    { Public declarations }
				  end;
				
				var
				  Form1: TForm1;
				
				implementation
				
				{$R *.DFM}
				
				procedure TForm1.FormPaint(Sender: TObject);
				begin
				  {draw a pie shaped wedge}
				  Canvas.Brush.Color := clRed;
				  Canvas.Brush.Style := bsDiagCross;
				  Pie(Canvas.Handle, 10, 10, 110, 110, 10, 60, 60, 10);
				end;
				
				end.