如何使用TIdHTTP停止(取消)下载

Question

我正在TIdHTTP.Get 线程中使用该过程来下载文件.我的问题是我如何停止(取消)下载文件？

Answer 1

我会尝试通过在TIdHTTP.OnWork事件中使用Abort方法抛出静默异常来取消它.此事件会因读/写操作而触发,因此在下载过程中也会触发此事件.

type
  TDownloadThread = class(TThread)
  private
    FIdHTTP: TIdHTTP;
    FCancel: boolean;
    procedure OnWorkHandler(ASender: TObject; AWorkMode: TWorkMode; 
      AWorkCount: Integer);
  public
    constructor Create(CreateSuspended: Boolean);
    property Cancel: boolean read FCancel write FCancel;
  end;

constructor TDownloadThread.Create(CreateSuspended: Boolean);
begin
  inherited Create(CreateSuspended);
  FIdHTTP := TIdHTTP.Create(nil);
  FIdHTTP.OnWork := OnWorkHandler;
end;

procedure TDownloadThread.OnWorkHandler(ASender: TObject; AWorkMode: TWorkMode;
  AWorkCount: Integer);
begin
  if FCancel then
  begin
    FCancel := False;
    Abort;
  end;
end;

或者如此处所述,对于直接断开连接,您可以在同一事件中使用Disconnect方法.

procedure TDownloadThread.OnWorkHandler(ASender: TObject; AWorkMode: TWorkMode;
  AWorkCount: Integer);
begin
  if FCancel then
  begin
    FCancel := False;
    FIdHTTP.Disconnect;
  end;
end;

Answer 2

您可以使用默认过程 idhttp1.Disconnect...