Created
November 14, 2016 03:03
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Send a message using UDP in Swift 3
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//: Playground - noun: a place where people can play | |
import Cocoa | |
import Darwin | |
func htons(value: CUnsignedShort) -> CUnsignedShort { | |
return (value << 8) + (value >> 8) | |
} | |
let INADDR_ANY = in_addr(s_addr: 0) | |
let fd = socket(AF_INET, SOCK_DGRAM, 0) | |
var addr_in = sockaddr_in(sin_len: __uint8_t(MemoryLayout<sockaddr_in>.size), sin_family: sa_family_t(AF_INET), sin_port: htons(value: 3001), sin_addr: INADDR_ANY, sin_zero: (0,0,0,0, 0,0,0,0)) | |
let addr_to = sockaddr(sa_len: __uint8_t(MemoryLayout<sockaddr_in>.size), sa_family: sa_family_t(AF_INET), sa_data: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)) | |
let message = "Message from Swift 3" | |
message.withCString { cstr -> Void in | |
let sent = withUnsafePointer(to: &addr_in) { | |
let broadcastMessageLength = Int(strlen(cstr) + 1) | |
let p = UnsafeRawPointer($0).bindMemory(to: sockaddr.self, capacity: 1) | |
// Send the message | |
sendto(fd, cstr, broadcastMessageLength, 0, p, socklen_t(addr_in.sin_len)) | |
} | |
print("Sent? \(sent)") | |
} |
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