delphi延时 4种方法

/////////////////挂起，不占CPU

sleep

//////////////////不挂起,占cpu

procedure Delay(msecs:integer);

var

FirstTickCount:longint;

begin

FirstTickCount:=GetTickCount;

repeat

Application.ProcessMessages;

until ((GetTickCount-FirstTickCount) >= Longint(msecs));

end;

////////////////////////////////////////// 定时器

procedure timerfun(handle:Thandle;msg:word;identer:word;dwtime:longword);stdcall;

begin

showmessage('到点了');

killtimer(handle,identer);//关闭定时器

end;

//其中的identer是定时器的句柄

procedure TForm1.Button1Click(Sender: TObject);

var

identer:integer;

begin

   identer:=settimer(0,0,2000,@timerfun);

   if identer=0 then exit; //定时器没有创建成功。

end;

////////////////////////////////////////////////// 不占CPU不挂起

function TForm1.HaveSigned(MaxWaitTime: Cardinal): Boolean;

var   I:Integer;

var   WaitedTime:Cardinal;

begin

          WaitedTime:=0;

          while      (WaitedTime<MaxWaitTime)   do

          begin

                  SleepEx(100,False);

                  Inc(WaitedTime,100);

                  Application.ProcessMessages ;

          end

end;