差分

| [[Swift]] | [[SwiftUI]] | [[Xcode]] | [[Mac]] |

==Network====Network=データ取得===

=====[[MacOS]]でエラーの場合=====<code>Error Domain=NSURLErrorDomain Code=-1003</code> *https://www.poly-rhythm.com/hostname-could-not-be-found/ *https://developer.apple.com/documentation/xcode/adding_capabilities_to_your_app[[File:swift_macos_net_error.png|600px]] ==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)<pre>struct Host : Codable { var host: String = "" var ip: String = "" var macaddr: String = ""}</pre>*読み込み、コレクションに追加、書き出し処理<pre> 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) } }</pre>[[File:swift_json_encode.png|300px]]=====書式を指定=====<pre> let encoder = JSONEncoder() encoder.outputFormatting = [.prettyPrinted, .sortedKeys]</pre>=====Stringに変換=====<pre> let json = try encoder.encode(hosts.hosts) let jsonString = String(data: json, encoding: .utf8)! print(jsonString)</pre>=====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<pre>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) }</pre> ===ディレクトリ判定===----<pre>private static let fm = FileManager.defaultstatic func isDirectory(path: String) -> Bool { var isDir = ObjCBool(false) fm.fileExists(atPath: path, isDirectory: &isDir) return isDir.boolValue}</pre> ==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。<blockquote>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.</blockquote>*DispatchQueue.main.syncで囲む<pre>DispatchQueue.main.sync { observableobj.content = text}</pre>===ディレクトリを選択===----<pre>static func chooseDir() -> String { let dialog = NSOpenPanel();  dialog.title = "Choose a root directory" dialog.showsResizeIndicator = true dialog.showsHiddenFiles = false dialog.allowsMultipleSelection = false dialog.canChooseDirectories = true dialog.canChooseFiles = false  if (dialog.runModal() == NSApplication.ModalResponse.OK) { let result = dialog.url  if (result != nil) { let path: String = result!.path return path } } return "";}</pre> ==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<pre> 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!) }</pre> ===非同期処理===----<pre>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 } }}</pre> ==[[正規表現]]=====arp -a の結果からIPアドレスを抜きだす===----<pre> 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") }</pre>===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<pre> 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)</pre> ===名前を付与してキャプチャ===----<pre>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") }}</pre>