ios 如何在 iPhone 上实现 UDP 客户端并在 Swift 中发送数据？
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How to implement UDP client and send data in Swift on iPhone?
提问by Martin
I want to develop UDP client and send data in Swift.
我想开发UDP客户端并在Swift中发送数据。
I have reference the following link:
我参考了以下链接：
Swift: Receive UDP with GCDAsyncUdpSocket
Swift：使用 GCDAsyncUdpSocket 接收 UDP
Retrieving a string from a UDP server message
But I could not find a good way to implement UDPin Swift.
但是我找不到UDP在Swift.
Can someone teach me How to implement UDP client and send data in Swift on iPhone?
有人可以教我如何在 iPhone 上用 Swift 实现 UDP 客户端和发送数据吗？
回答by AbdulMomen ?????????
回答by ingconti
very nice sample! My two cents.. fixed for swift 4.2. / Xcode 10, (I love using 20 lines instead of a bunch of other files.. and Pods.. ). Added some more returned results.
非常好的样品！我的两美分.. 固定为 swift 4.2。/ Xcode 10，（我喜欢使用 20 行而不是一堆其他文件……和 Pods……）。添加了更多返回的结果。
import Foundation
func udpSend(textToSend: String, address: in_addr, port: CUnsignedShort) {
func htons(value: CUnsignedShort) -> CUnsignedShort {
return (value << 8) + (value >> 8);
}
let fd = socket(AF_INET, SOCK_DGRAM, 0) // DGRAM makes it UDP
let addr = sockaddr_in(
sin_len: __uint8_t(MemoryLayout<sockaddr_in>.size),
sin_family: sa_family_t(AF_INET),
sin_port: htons(value: port),
sin_addr: address,
sin_zero: ( 0, 0, 0, 0, 0, 0, 0, 0 )
)
let sent = textToSend.withCString { cstr -> Int in
var localCopy = addr
let sent = withUnsafePointer(to: &localCopy) { pointer -> Int in
let memory = UnsafeRawPointer(pointer).bindMemory(to: sockaddr.self, capacity: 1)
let sent = sendto(fd, cstr, strlen(cstr), 0, memory, socklen_t(addr.sin_len))
return sent
}
return sent
}
close(fd)
}
}
回答by hnh
This looks like a dupe to Swift UDP Connection.
这看起来像是对Swift UDP Connection的欺骗。
Refactoring the example a little bit:
稍微重构一下示例：
let INADDR_ANY = in_addr(s_addr: 0)
udpSend("Hello World!", address: INADDR_ANY, port: 1337)
func udpSend(textToSend: String, address: in_addr, port: CUnsignedShort) {
func htons(value: CUnsignedShort) -> CUnsignedShort {
return (value << 8) + (value >> 8);
}
let fd = socket(AF_INET, SOCK_DGRAM, 0) // DGRAM makes it UDP
var addr = sockaddr_in(
sin_len: __uint8_t(sizeof(sockaddr_in)),
sin_family: sa_family_t(AF_INET),
sin_port: htons(port),
sin_addr: address,
sin_zero: ( 0, 0, 0, 0, 0, 0, 0, 0 )
)
textToSend.withCString { cstr -> Void in
withUnsafePointer(&addr) { ptr -> Void in
let addrptr = UnsafePointer<sockaddr>(ptr)
sendto(fd, cstr, strlen(cstr), 0, addrptr, socklen_t(addr.sin_len))
}
}
close(fd)
}
If you have the target IP as a string, use inet_pton() to convert it to an in_addr. Like so:
如果您将目标 IP 作为字符串，请使用 inet_pton() 将其转换为 in_addr。像这样：
var addr = in_addr()
inet_pton(AF_INET, "192.168.0.1", &buf)
Feel free to steal code from over here: SwiftSockets
随意从这里窃取代码：SwiftSockets
Oh, and if you plan to do any serious network programming, grab this book: Unix Network Programming
哦，如果您打算进行任何严肃的网络编程，请阅读本书：Unix 网络编程
回答by Ash
After pretty extensive research coming up with only basic pointers towards GCD's AsyncSocket, and being a pure Swift trained iOS programmer, I looked for something with native Swift socket support.
经过相当广泛的研究，只找到了 GCD 的 AsyncSocket 的基本指针，并且作为一名纯 Swift 训练有素的 iOS 程序员，我寻找具有原生 Swift 套接字支持的东西。
Thankfully, I found a much simpler alternative to using Async, called SwiftSocket.
谢天谢地，我找到了一个更简单的异步替代方法，称为 SwiftSocket。
The github (https://github.com/xyyc/SwiftSocket) has examples for most sockets, and is ready to use by copying just a few files into a project.
github ( https://github.com/xyyc/SwiftSocket) 提供了大多数套接字的示例，只需将几个文件复制到项目中即可使用。
For swift-only devs, I feel its underutilized and will quickly replace Async for non-objective-c apps. Then again I'm pretty new to this stuff so I may be way off :D
对于只使用 swift 的开发人员，我觉得它没有得到充分利用，并将很快取代 Async 用于非目标 C 应用程序。再说一次，我对这些东西很陌生，所以我可能会离开：D
