在Java中像在Java中一样在Swift中使用套接字 [英] Using sockets in Swift like in Java
问题描述
如果要连接到服务器，则在Java中，我将打开一个Socket并使用端口和主机地址对其进行初始化，然后检索输入/输出流并读取/写入所需的任何内容.
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，我很难做到这一点，因为它不是那样构建的，我真的很想看到一个简单的示例，该示例说明了如何连接到服务器，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引用之后的经过测试的代码.
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:
-
初始化以上两个流还需要使用 CFAllocator ，我对此一无所知.使用 kCFAllocatorDefault 并没有太大帮助，出现同样的错误.
Initializing the two streams above also require the use of CFAllocator which I know nothing about. Using kCFAllocatorDefault did not quite help, same errors.
上面的代码返回此错误: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) 构造UInt32时，错误是: 找不到' 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
我自己想通了，对于那些需要解释的人请先阅读；
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通信的方法.
There are multiple ways of using Sockets to communicate with local application or a remote server.
原始帖子中描述的问题是获取Input/Output流并使它们工作. (本文结尾处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 类具有一个称为 getStreamsToHost 的静态方法(快速的类函数). 您需要准备的是使用实际主机地址，端口号，对NSInputStream obj的引用以及对NSOutputStream obj进行初始化的NSHost对象. 然后，您可以使用此处显示的流，并在参考文章中进行解释a>.
The NSStream class has a static method (class function in swift) called getStreamsToHost. All you have to prepare is a NSHost objected initialized with a real host address, a port number, a reference to a NSInputStream obj and also for a NSOutputStream obj. Then, you can use the streams as shown here and explained in the reference post.
看看这个简单的代码；
look at this simple code;
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)
在执行此简单代码之前，我启动了ncat来侦听终端中的端口4000，然后键入"Hello！".并打开插座进行通讯.
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，您可以看到在关闭套接字之前，我已经在终端收到了字符串"Jonathan Yaniv.\ n".
After launching the code, you can see that I have received the string "Jonathan Yaniv.\n" to the terminal before the socket was closed.
我希望这可以使您中的一些人头疼. 如果您还有其他问题，请尝试一下.
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.
&表示法在本文中进行了说明. (与NSInputStream读取用法有关)
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