代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormDestroy(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var
f: Integer;
hWaitableTimer: THandle;
function MyThreadFun(p: Pointer): DWord; stdcall;
var
i,y: Integer;
begin
Inc(f);
y := 20 * f;
{這裡和上面不同, 把等待弄到循環裡面了}
for i := 0 to 1000 do
begin
if WaitForSingleObject(hWaitableTimer, INFINITE) = WAIT_OBJECT_0 then
begin
Form1.Canvas.Lock;
Form1.Canvas.TextOut(20, y, IntToStr(i));
Form1.Canvas.Unlock;
// Sleep(1);
end;
end;
Result := 0;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
ThreadID: DWord;
DueTime: Int64;
begin
hWaitableTimer := CreateWaitableTimer(nil, False, nil); {這裡的參數也和上面不一樣}
DueTime := 0;
SetWaitableTimer(hWaitableTimer, DueTime, 500, nil, nil, False); {500 ms}
Repaint; f := 0;
CreateThread(nil, 0, @MyThreadFun, nil, 0, ThreadID);
CreateThread(nil, 0, @MyThreadFun, nil, 0, ThreadID);
CreateThread(nil, 0, @MyThreadFun, nil, 0, ThreadID);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
CloseHandle(hWaitableTimer);
end;
end.
