使用 NSOperation 下载和 FTP 文件

发布于 2024-11-17 13:46:59 字数 889 浏览 4 评论 0原文

我正在尝试使用 NSOperation 从 FTP 服务器下载文件。我的下载基本示例是 Apple 的简单 FTP 项目。特别是，我使用的是 GetController 类中的代码。我尝试从那里下载的 URL 工作正常。

在我的 NSOperation 子类中，我重写了 start 方法并调用 GetController 中的 _startRecieve 方法。正在调用 NSStream 委托，但事件为 NSStreamEventErrorOccurred。

我调查了一下这个错误，它是 kCFErrorDomainCFNetwork 错误 200，也就是 kCFFTPErrorUnexpectedStatusCode。

由于代码 _startRecieve 代码是相同的，我能想到的唯一问题是它包含在 NSOperation 中。唯一看起来可能与操作 _startRecieve 相关的问题是这样的。

self.networkStream.delegate = self;
[self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[self.networkStream open];

有什么想法为什么这不起作用吗？

谢谢，罗斯

原文

I am trying to download a file from an FTP server using an NSOperation. My base example for the download is Apple's Simple FTP project. In particular, I am using the code from the GetController class. The URL that I am trying to download works fine from there.

In my NSOperation subclass, I override the start method and call the _startRecieve method found in GetController. The NSStream delegate is getting called, but the event is NSStreamEventErrorOccurred.

I investigated the error a bit, and it is kCFErrorDomainCFNetwork error 200, which is kCFFTPErrorUnexpectedStatusCode.

Since the code _startRecieve code is identical, the only problem that I can think of would be the fact that it is contained in an NSOperation. The only thing that looks like it could have problems with an operation _startRecieve is this.

self.networkStream.delegate = self;
[self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[self.networkStream open];

Any ideas why this is not working?

Thanks,
Ross

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