我正在使用 OmniThreadLibrary 来实现用于发送电子邮件的后台管道(请参阅此 SO question)。我注意到关闭应用程序后,它继续在后台运行(在 Windows 任务管理器中看到)。这意味着我的代码在实现 OTL 管道的方式上存在问题。你能帮我找出问题所在吗?
代码如下:
unit uEmailQueue;
interface
uses Classes, OtlCommon, OtlCollections, OtlParallel, Windows;
type
TEmailServer = record
SMTPHost: String;
SMTPPort: Integer;
SMTPUseSSL: Boolean;
SMTPUserName: String;
SMTPPassword: String;
SMTPSenderName: String;
end;
TEmailMessage = record
RecipientEmailAddr: String;
EmailSubject: String;
EmailMessage: String;
end;
TEmailQueue = class(TObject)
private
FEmailServer: TEmailServer;
FPipeline: IOmniPipeline;
procedure SendEmailStage(const input, output: IOmniBlockingCollection);
public
constructor Create;
destructor Destroy; override;
procedure SendEmail(AEmailMessage: TEmailMessage);
end;
implementation
{ TEmailQueue }
procedure TEmailQueue.SendEmailStage(const input, output: IOmniBlockingCollection);
var
mailmessage: TOmniValue;
begin
for mailmessage in input do
begin
Beep(3700, 1500); // just some dummy code for now
end;
end;
constructor TEmailQueue.Create;
begin
FPipeline := Parallel.pipeline.Stage(SendEmailStage).Run;
end;
destructor TEmailQueue.Destroy;
begin
inherited;
end;
procedure TEmailQueue.SendEmail(AEmailMessage: TEmailMessage);
begin
FPipeline.input.Add(TOmniValue.FromRecord(AEmailMessage));
// FPipeline.input.CompleteAdding;
// FPipeline.WaitFor(INFINITE);
end;
end.
我像这样初始化并调用上面的类:
在应用程序主窗体的 OnCreate 事件中:
FEmailQueue := TEmailQueue.Create;
主窗体上的按钮在 OnClick 事件中有这个:
var
em: TEmailMessage;
begin
FEmailQueue.SendEmail(em);
后来,我在主窗体的 OnDestroy 事件中像这样释放类:
FEmailQueue.Free;