I think your process terminates immediately after calling ‘task.resume()’.
You can find the same issue at https://stackoverflow.com/questions/31944011/how-to-prevent-a-command-line-tool-from-exiting-before-asynchronous-operation-co <https://stackoverflow.com/questions/31944011/how-to-prevent-a-command-line-tool-from-exiting-before-asynchronous-operation-co>. > 2017/08/21 14:55、Daryle Walker via swift-users <swift-users@swift.org>のメール: > > I’ve tried to make a command-line program with the Swift Package Manager, and > use Foundation for networking (on macOS): > > import Foundation > import Commander > import HeliumLogger > import LoggerAPI > > enum ReturnCode: Int32 { > case badUrlString = 10, retrievalError > } > HeliumLogger.use() > let main = command { (urlArgument: String) in > guard let url = URL(string: urlArgument) else { > Log.error("Argument \"\(urlArgument)\" cannot be converted to a URL.") > exit(ReturnCode.badUrlString.rawValue) > } > let session = URLSession(configuration: .ephemeral) > let task = session.dataTask(with: url, completionHandler: { (data, > response, error) in > if let error = error { > Log.error("Retrieval Error: \(error)") > exit(ReturnCode.retrievalError.rawValue) > } > guard let data = data else { > print("(no data)") > return > } > print(data.base64EncodedString()) > print("Hi there") > }) > print("Hello world") > task.resume() > } > main.run() > > All I got from “swift build” and the Xcode project it made for me is just the > “Hello world” message. The task block was ignored. Did I get calling it wrong? > > — > Daryle Walker > Mac, Internet, and Video Game Junkie > darylew AT mac DOT com > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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