Multithreading 如何在delphi中直接在线程外部终止线程?
我想通过单击按钮终止线程。如果线程在没有用户中断的情况下正常工作,则可以,但有时用户需要中止线程,这就是用户如何中止线程的问题 以下是我测试的代码:Multithreading 如何在delphi中直接在线程外部终止线程?,multithreading,delphi,kill,Multithreading,Delphi,Kill,我想通过单击按钮终止线程。如果线程在没有用户中断的情况下正常工作,则可以,但有时用户需要中止线程,这就是用户如何中止线程的问题 以下是我测试的代码: unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, mmsystem, ExtCtrls; type TForm1 = class(TForm
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, mmsystem, ExtCtrls;
type
TForm1 = class(TForm)
Image1: TImage;
procedure Image1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
end;
type
hangth = class(TThread)
private
{ Private declarations }
protected
procedure Execute; override;
procedure play;
end;
var
Form1: TForm1;
played: boolean;
szalhang: hangth;
implementation
{$R *.dfm}
procedure hangth.play;
begin
played := true;
szalhang.Terminate;
end;
procedure hangth.Execute;
begin
played := false;
SndPlaySound(pchar('hang.wav'), SND_SYNC);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
played := true;
end;
procedure TForm1.Image1Click(Sender: TObject);
begin
if played = true then begin
szalhang := hangth.Create(true);
szalhang.Resume;
end else begin
szalhang.Terminate();
// here i want to terminate thread, but it doesn't want to be killed.
end;
end;
end.
调用
TThread.Terminate()
时,它会将TThread.Terminated
属性设置为true,而不执行其他操作。TThread.Execute()
code负责定期查看TThread.Terminated
属性,并在该属性为真时优雅地退出。但是,在这种情况下,这是不可能的,因为SndPlaySound()
正在阻塞线程,并且在SND\u SYNC
模式下运行时,无法中断SndPlaySound()
。您唯一的选择是使用Win32 APITerminateThread()
函数对线程执行暴力终止
由于您显然需要对音频播放进行更多控制,并检测音频何时播放完毕,因此SndPlaySound()
不是满足您需要的最佳解决方案。你有一个<代码> tFrase>代码>,你可以考虑使用Delphi的代码> TMIIApPARTION/COD>组件,例如:
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls, Vcl.MPlayer;
type
MPlayerState = (mpsClosed, mpsOpened, mpsPlaying);
TForm1 = class(TForm)
Image1: TImage;
MediaPlayer1: TMediaPlayer;
procedure MediaPlayer1Notify(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Image1Click(Sender: TObject);
private
{ Private declarations }
State: MPlayerState;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm56.FormCreate(Sender: TObject);
begin
State := mpsClosed;
MediaPlayer1.FileName := 'C:\full path to\hang.wav';
end;
procedure TForm56.MediaPlayer1Notify(Sender: TObject);
begin
case MediaPlayer1.Mode of
mpStopped, mpPlaying:
State := mpsOpened;
end;
end;
procedure TForm1.Image1Click(Sender: TObject);
begin
if State = mpsClosed then
begin
MediaPlayer1.Notify := False;
MediaPlayer1.Wait := True;
MediaPlayer1.Open;
State := mpsOpened;
end;
if State = mpsOpened then
begin
MediaPlayer1.Notify := True;
MediaPlayer1.Wait := False;
MediaPlayer1.Play;
if MediaPlayer1.Error = 0 then
State := mpsPlaying
end else
begin
MediaPlayer1.Notify := False;
MediaPlayer1.Wait := True;
MediaPlayer1.Stop;
State := mpsOpened;
MediaPlayer1.Notify := False;
MediaPlayer1.Wait := True;
MediaPlayer1.Close;
State := mpsClosed;
end;
end;
end.
但我们仍然不知道问题是什么。“在线程外部直接终止线程”是什么意思?我想通过单击按钮终止线程。如果线程在没有用户中断的情况下正常工作,则可以,但有时用户需要中止线程,这就是用户如何中止线程的问题。好的,这是一个好的开始。但是你能修复上面的代码以便编译吗?你们说它有效,但我们都看到了它无效的证据。代码被重新附加。它现在可以编译了。它没有编译,我做了修复让它编译,并为你清理了它。现在你能更清楚一点它是怎么不起作用的吗?它做了什么/没有做什么你没有预料到的?