让线条运行在表格上 [英] Let stay thread running on form close

问题描述

我在我的应用程序中做了一个同步线程，我想知道有没有办法让线程保持开放，直到它完成同步过程，如果我关闭应用程序表单？

解决方案

在Rob的优秀答案的评论中，提出了等待时显示UI的问题。如果您需要在等待时显示UI，那么您将需要一个更高级的等待， TThread.WaitFor 。这是我使用的，依靠 MsgWaitForMultipleObjects 。

  procedure WaitUntilSignaled（Handle：THandle; ProcessMessages：布尔）; 
 begin 
如果ProcessMessages然后开始
 Application.ProcessMessages; //如果有任何消息已经在队列中等待
，而MsgWaitForMultipleObjects（1，Handle，False，INFINITE， QS_ALLEVENTS）= WAIT_OBJECT_0 + 1 do begin 
 Application.ProcessMessages; 
结束
 end else begin 
 WaitForSingleObject（Handle，INFINITE）; 
结束
结束
 
 .... 
 
 Form.Show; 
 WaitUntilSignaled（Thread.Handle，True）; 
 Form.Close; 
  

I made a syncing thread on my application and I want to know is there a way to let the thread stay open until it finishes it's syncing process, if i close the application form?

解决方案

In the commentary to Rob's excellent answer, the question of showing UI whilst waiting was raised. If you need to show UI whilst waiting, then you will need a more advanced wait that TThread.WaitFor. This is what I use in its place, relying on MsgWaitForMultipleObjects.

procedure WaitUntilSignaled(Handle: THandle; ProcessMessages: Boolean);
begin
  if ProcessMessages then begin
    Application.ProcessMessages;//in case there are any messages are already waiting in the queue
    while MsgWaitForMultipleObjects(1, Handle, False, INFINITE, QS_ALLEVENTS)=WAIT_OBJECT_0+1 do begin
      Application.ProcessMessages;
    end;
  end else begin
    WaitForSingleObject(Handle, INFINITE);
  end;
end;

....

Form.Show;
WaitUntilSignaled(Thread.Handle, True);
Form.Close;

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