延时指定时间

// 1. Delay procedure Delay(dwMilliseconds: Longint);
var
iStart, iStop: DWORD;
begin
iStart := GetTickCount;
repeat
iStop := GetTickCount;
Application.ProcessMessages;
until (iStop - iStart) >= dwMilliseconds;
end;
// 2. Delay: with API
procedure Delay(msecs: Longint);
var
targettime: Longint;
Msg: TMsg;
begin
targettime := GetTickCount + msecs;
while targettime < GetTickCount do
if PeekMessage(Msg, 0, 0, 0, PM_REMOVE) then
begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end;
{
Note:
The elapsed time is stored as a DWORD value.
Therefore, the time will wrap around to zero if the system is
run continuously for 49.7 days.
}
// 3. Sleep
{
The Sleep function suspends the execution of the current
thread for a specified interval.
}
Sleep(dwMilliseconds: Word);
　
// 4. Combined Delay
{
Including the Sleep in the loop prevents the app from hogging
100% of the CPU for doing practically nothing but running around the loop.
}
procedure PauseFunc(delay: DWORD);
var
lTicks: DWORD;
begin
lTicks := GetTickCount + delay;
repeat
Sleep(100);
Application.ProcessMessages;
until (lTicks <= GetTickCount) or Application.Terminated;
end;