像在 Java 中一样在 Swift 中使用套接字 [英] Using sockets in Swift like in Java
问题描述
如果我想连接到服务器，在 Java 中我会打开一个 Socket 并用端口和主机地址初始化它，然后检索输入/输出流并读/写我想要的任何内容.
If I wanted to connect to a server, in Java I would open a Socket and initialize it with port and host address, then retrieve the input/output streams and read/write whatever I want.
在 Swift 中，我很难这样做，因为它不是那样构建的，我真的很想看一个简单的例子，说明如何连接到服务器、检索流并使用它们.
In Swift I'm having hard time doing so since it's not built that way and I would really like to see a simple example of how to connect to a server, retrieve the streams and use them.
这是@Grimxn 引用后经过测试的代码.
This is the tested code after what @Grimxn referenced.
var host = "http://google.com"
var readStream :CFReadStreamRef
var writeStream :CFWriteSteamRef
var socket = CFStreamCreatePairWithSocketToHost(nil, host, 80, readStream, writeStream)
主要问题:
初始化上面的两个流还需要使用CFAllocator，我对此一无所知.使用 kCFAllocatorDefault 并没有太大帮助，同样的错误.
Initializing the two streams above also require the use of CFAllocator which I know nothing about. Using kCFAllocatorDefault did not quite help, same errors.
以上代码返回此错误:无法将表达式的类型Void"转换为类型 UInt32.
The above code returns this error: Cannot Convert the expression's type 'Void' to type UInt32.
例如，当我使用 UInt32(80) 构建 UInt32 时，错误是:找不到 ' 的重载init' 接受提供的参数.
When I construct a UInt32 using UInt32(80) for example, the error is: Could not find an overload for 'init' that accepts the supplied argument.
感谢您的帮助！
推荐答案
我自己已经想到了，想看解释的人请提前阅读；
I have figured it myself, for those who look for an explanation read ahead;
有多种使用套接字与本地应用程序或远程服务器进行通信的方式.
There are multiple ways of using Sockets to communicate with local application or a remote server.
原帖中描述的问题是获取输入/输出流并使它们工作.(在这篇文章的末尾，引用了我的另一篇文章，解释了如何使用这些流)
The problem described in the original post was to get the Input/Output streams and get them to work. (At the end of this post there's a reference to another post of mine explaining how to use those streams)
NSStream 类有一个名为 getStreamsToHost 的静态方法(swift 中的类函数).所有你需要准备的是一个 NSHost 对象，它用一个真实的主机地址、一个端口号、一个对 NSInputStream obj 的引用以及一个 NSOutputStream obj 初始化.然后，您可以使用此处显示的流，并在参考文章.
看看这个简单的代码；
let addr = "127.0.0.1"
let port = 4000
var host :NSHost = NSHost(address: addr)
var inp :NSInputStream?
var out :NSOutputStream?
NSStream.getStreamsToHost(host, port: port, inputStream: &inp, outputStream: &out)
let inputStream = inp!
let outputStream = out!
inputStream.open()
outputStream.open()
var readByte :UInt8 = 0
while inputStream.hasBytesAvailable {
inputStream.read(&readByte, maxLength: 1)
}
// buffer is a UInt8 array containing bytes of the string "Jonathan Yaniv.".
outputStream.write(&buffer, maxLength: buffer.count)
在执行这个简单的代码之前，我启动了 ncat 来监听终端中的 4000 端口并输入Hello ！"并保持套接字打开以进行通信.
Before executing this simple code, I launched ncat to listen on port 4000 in my terminal and typed "Hello !" and left the socket opened for communication.
Jonathans-MacBook-Air:~ johni$ ncat -l 4000
Hello !
Jonathan Yaniv.
Jonathans-MacBook-Air:~ johni$
启动代码后，可以看到在socket关闭之前，我已经收到了到终端的字符串Jonathan Yaniv. ".
After launching the code, you can see that I have received the string "Jonathan Yaniv. " to the terminal before the socket was closed.
我希望这能让你们中的一些人免于头疼.如果您有更多问题，请试一试，希望我能回答.
I hope this saved some headache to some of you. If you have more questions give it a shot, I hope I'll be able to answer it.
&符号在这篇文章中有解释. (参考 NSInputStream 读取使用)
这篇关于像在 Java 中一样在 Swift 中使用套接字的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
