Cocoa NSStream TCP 连接到 FTP
我是 Cocoa 新手，但不是编程新手。 最近，我决定为 Mac 编写一个 FTP 客户端，因此我首先用我最熟悉的语言（在 Windows 上）编写它，然后当我完成 FTP 通信的工作后，转向 Cocoa。
我的问题（显然）有点争议：如何建立到（ftp 服务器）的读/写连接？
到目前为止我所拥有的（显然不起作用）：
NSInputStream *iStream;
NSOutputStream *oStream;
NSHost *host = [NSHost hostWithAddress:@"127.0.0.1"];
[NSStream getStreamsToHost:host port:3333 inputStream:&iStream outputStream:&oStream];
// ftp port: 3333
[iStream retain];
[oStream retain];
[iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[oStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[iStream setDelegate:self];
[oStream setDelegate:self]; // which is not implemented apparently
[iStream open];
[oStream open];
// .... [iStream write: (const uint8_t *)buf maxLength:8];
部分基于 http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/Streams/Articles/NetworkStreams.html 现在，我为什么选择 NSStream？因为虽然这个问题只是关于如何连接到 FTP 流，但我的整个项目还将包括 SSL，并且据我能够在此处和 google 上搜索，NSStream 能够“切换”到 SSL 连接。
我无法看到正在建立的连接（我通常能够做到），但我也听说过在流打开之前必须写入流的信息？
非常感谢任何指点，如果我的问题很烦人，我很抱歉 - 我是 Cocoa 的新手:)
I'm new to Cocoa, but not to programming.
Recently I decided I wanted to write a FTP client for Mac, and so I first made it in the language I'm most comfortable in (on Windows), and then moved on to Cocoa when I had the workings of FTP communications down.
My question is (apparently) a bit controversial: How do I establish a read/writeable connection to (a ftp server)?
What I have so far (non working obviously):
NSInputStream *iStream;
NSOutputStream *oStream;
NSHost *host = [NSHost hostWithAddress:@"127.0.0.1"];
[NSStream getStreamsToHost:host port:3333 inputStream:&iStream outputStream:&oStream];
// ftp port: 3333
[iStream retain];
[oStream retain];
[iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[oStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[iStream setDelegate:self];
[oStream setDelegate:self]; // which is not implemented apparently
[iStream open];
[oStream open];
// .... [iStream write: (const uint8_t *)buf maxLength:8];
Which is partially based on http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/Streams/Articles/NetworkStreams.html
Now, why have I chosen NSStream? Because while this question is merely about how to connect to a FTP stream, my whole project will also include SSL and as far as I've been able to search here and on google, NSStream is capable of "switching" to a SSL connection.
I've not been able to see the connection being made (which I'm usually able to do), but I also heard something about having to write to the stream before the stream will open?
Any pointers are greatly appreciated, and sorry if my question is annoying - I'm new to Cocoa :)
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所以当我说我是 Cocoa 新手时，我是认真的。事实证明上面的代码毕竟有效，我只是看不到它，因为我希望在这一行建立连接：
[NSStream getStreamsToHost:主机端口:3333 inputStream:&iStream outputStream:&oStream];
但直到我出于调试目的在底部添加了 NSRunAlert 之后才制作它。
我不确定我是否比困惑更尴尬，呵呵。
So when I said I was new to Cocoa I meant every word of it. Turns out the code above worked after all, I just wasn't able to see it because I expected the connection to be made at this line:
[NSStream getStreamsToHost:host port:3333 inputStream:&iStream outputStream:&oStream];
but it wasn't made until after a NSRunAlert I added at the bottom for debug purpose.
I'm not sure wether I'm more embaressed than I am confused hehe.
您需要实现handleEvent委托方法并观察输入和输出流对象发生了什么...看看文档，那里有解释！
You need to implement handleEvent delegate method and watch what is happening to your Input and Output stream objects... Take a look at the docs, it's explained there!