全局钩子线程占用太多CPU,如何修复？

Question

以下全局Hook线程占用太多CPU,除非我在那里添加Sleep(10),是否有另一个解决方案而不是Sleep(10 ms) - 休眠看起来不像是我的应用程序性能的最佳解决方案.如果我增加太多睡眠,它也不会减慢鼠标的速度.

  procedure THookThread.Execute;
    begin
      hookhandle := SetWindowsHookEx(WH_MOUSE_LL, @LowLevelMouseHook, Hinstance, 0);

     while not Terminated do
      begin    
        MessageLoop;
      //  Sleep(10);
      end;

      UnHookWindowsHookEx(hookhandle);
      hookhandle := 0;

    end;

procedure THookThread.MessageLoop;
var
  msg: TMsg;
begin
  while PeekMessage(msg, 0, 0, 0, PM_NOREMOVE) do
  begin
    TranslateMessage(msg);
    DispatchMessage(msg);
  end;
end;

Answer 1

您的消息循环是一个繁忙的循环.你应该使用GetMessage而不是PeekMessage.那是因为GetMessage阻塞直到消息被添加到队列中.

您在注释中注明了GetMessage阻止终止代码的块.通过在终止之后向线程发布消息来处理该问题.或者WM_NULL作为一般醒来,或WM_QUIT作为显式指令以退出消息循环.

Answer 2

尝试更像这样的东西:

procedure THookThread.Execute;
var
  msg: TMsg;
  ret: LongInt;
begin
  //create the message queue...
  PeekMessage(msg, 0, WM_USER, WM_USER, PM_NOREMOVE);

  hookhandle := SetWindowsHookEx(WH_MOUSE_LL, @LowLevelMouseHook, Hinstance, 0);
  if hookhandle = 0 then RaiseLastOSError; 

  try
    while GetMessage(msg, 0, 0, 0) and (not Terminated) do
    begin
      TranslateMessage(msg);
      DispatchMessage(msg);
    end;
  finally
    UnHookWindowsHookEx(hookhandle);
    hookhandle := 0;
  end;
end;

procedure THookThread.Stop;
begin
  Terminate;
  PostThreadMessage(ThreadID, WM_QUIT, 0, 0);
end;