Swift Sample
Swift Sample
Network
データ取得
let url = URL(string: "https://www.typea.info/blog/")!
let task = URLSession.shared.dataTask(with: url) { data, response, error in
if let error = error {
print("\(error)\n")
return
}
guard let data = data, let response = response as? HTTPURLResponse else {
print("no data or no response.")
return
}
if response.statusCode == 200 {
if let text = String(bytes: data, encoding: .utf8) {
print(text)
}
}
}
task.resume()
MacOSでエラーの場合
Error Domain=NSURLErrorDomain Code=-1003
- https://www.poly-rhythm.com/hostname-could-not-be-found/
- https://developer.apple.com/documentation/xcode/adding_capabilities_to_your_app
File
JSONにシリアライズしてドキュメントディレクトリへ書き出し
- データ（Codableを適用する)
struct Host : Codable {
var host: String = ""
var ip: String = ""
var macaddr: String = ""
}
- 読み込み、コレクションに追加、書き出し処理
func addHostListDocument(host: WoL.Host) {
let docPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
let filePath = URL(fileURLWithPath: "hosts.json", relativeTo:docPath)
var hostList: [WoL.Host] = []
let decoder = JSONDecoder()
do {
let rawData = try Data(contentsOf: filePath)
print(rawData)
let tmpHostList = try decoder.decode([WoL.Host].self, from: rawData)
for tmpHost in tmpHostList {
hostList.append(tmpHost)
}
} catch {
print(error)
}
hostList.append(host)
let encoder = JSONEncoder()
do {
let line = try encoder.encode(hostList)
try line.write(to: filePath)
} catch {
print(error)
}
}
書式を指定
let encoder = JSONEncoder()
encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
Stringに変換
let json = try encoder.encode(hosts.hosts)
let jsonString = String(data: json, encoding: .utf8)!
print(jsonString)
画面とオブジェクトを共有する
- struct -> class
- ObservableObject を適用
- @Published
- 上記を適用すると、Codable に適合させるには、明示的に処理を記述する必要がある
class Host : Codable, ObservableObject {
@Published var host: String = ""
@Published var ip: String = ""
@Published var macaddr: String = ""
@Published var comment: String = ""
init(host: String, ip: String, macaddr: String, comment: String) {
self.host = host
self.ip = ip
self.macaddr = macaddr
self.comment = comment
}
init() {}
/// 変換対象プロパティ
enum CodingKeys: CodingKey {
case host
case ip
case macaddr
case comment
}
required init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
host = try container.decode(String.self, forKey: .host)
ip = try container.decode(String.self, forKey: .ip)
macaddr = try container.decode(String.self, forKey: .macaddr)
comment = try container.decode(String.self, forKey: .comment)
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(host, forKey: .host)
try container.encode(ip, forKey: .ip)
try container.encode(macaddr, forKey: .macaddr)
try container.encode(comment, forKey: .comment)
}
UI
バックグラウンドからUIを操作する
- observableobj が、ObservableObject の派生クラス
- contentフィールドに、@Published アノテーション
- Viewで、@ObservedObjectを付与しインスタンスを生成
- 上記で、バックグラウンドから、observableobj.contentを操作すると、UIはメインスレッドから触るように怒られる。
Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates.
- DispatchQueue.main.syncで囲む
DispatchQueue.main.sync {
observableobj.content = text
}
処理
サブプロセスを起動
- プロセスを起動し、arp -a を呼び出し、出力
func arp() {
let outputPipe = Pipe()
func shell(path:String ,args: String...) -> Int32 {
let task = Process()
task.launchPath = path
task.arguments = args
task.standardOutput = outputPipe
task.standardError = outputPipe
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
let _ = shell(path:"/usr/sbin/arp",args: "-a")
let theTaskData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let stringResult = String(data: theTaskData, encoding: .utf8)
print(stringResult!)
}
非同期処理
let c = {
(ip:String) -> String in
let hostName = getHostName(ip: ip) // 時間がかかる処理
return hostName
}
let que = DispatchQueue.global(qos: .default)
for host in hosts.hosts {
print("CALL-\(host.ip)")
que.async { // 非同期処理
let hostname = c(host.ip) // 時間がかかる処理
DispatchQueue.main.async { // 画面に反映
host.host = hostname
}
}
}
正規表現
arp -a の結果からIPアドレスを抜きだす
func parseArp(arpResult: String?) {
if let input = arpResult {
do {
let pattern = #"[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"#
let regex = try NSRegularExpression(pattern: pattern, options:[])
for subinput in input.split(separator: "\r\n") {
let line = String(subinput)
let maches = regex.matches(in: line, options: [], range: _NSRange(0..<line.count))
print(line)
for mach in maches {
for i in 0 ..< mach.numberOfRanges {
let start = line.index(line.startIndex, offsetBy: mach.range(at: i).location)
let end = line.index(start, offsetBy: mach.range(at: i).length)
let text = String(line[start..<end])
print(text)
}
}
}
} catch {
print("RegEx fail.")
}
} else {
print("arp -a result : error")
}
digを経由してBonjourでIPアドレスをホスト名に解決
- コマンドをswiftで呼び出し dig +short -x 192.168.0.45 @224.0.0.251 -p 5353
let outputPipe = Pipe()
let _ = shell(outputPipe,
path:"/usr/bin/dig",
args: "+short",
"-x", ip,
"@224.0.0.251", "-p","5353") // Bonjour IPアドレス
let theTaskData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let stringResult = String(data: theTaskData, encoding: .utf8)
名前を付与してキャプチャ
func parseArp(arpResult: String?) {
if let input = arpResult {
do {
let pattern = #".*?(?<ip>[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}).*(?<mac>[0-9a-z]{1,2}:[0-9a-z]{1,2}:[0-9a-z]{1,2}:[0-9a-z]{1,2}:[0-9a-z]{1,2}:[0-9a-z]{1,2})"#
let regex = try NSRegularExpression(pattern: pattern, options:[])
for subinput in input.split(separator: "\r\n") {
let line = String(subinput)
let matches = regex.matches(in: line, options: [], range: _NSRange(0..<line.count))
print(line)
for match in matches {
for name in ["ip", "mac"] {
let matchRange = match.range(withName: name)
if let substrRanget = Range(matchRange, in:line) {
let ip = String(line[substrRanget])
print("\(name):\(ip)")
}
}
}
}
} catch {
print("RegEx fail.")
}
} else {
print("arp -a result : error")
}
}
© 2006 矢木浩人
