override func viewDidLoad() {
super.viewDidLoad()
let dataURLString: String = Bundle.main.path(forResource: "IMG_0568", ofType: "JPG")!
let dataURL = URL(string: dataURLString)
do {
let binaryData = try Data(contentsOf: dataURL!, options: [])
let kbData = binaryData.subdata(in: 0..<1024)
let stringArray = kbData.map{String(format: "%02X", $0)}
let binaryString = stringArray.joined(separator: "-")
print(binaryString)
editorTextView.text = (binaryString)
} catch {
print("Failed to read the file.")
//Error Domain=NSCocoaErrorDomain Code=256 "The file “IMG_0568.JPG” couldn’t be opened." UserInfo={NSURL=/Users/..../IMG_0568.JPG}
}
I want to display the Binary Data of Image File that I have added to my Xcode project (image name: IMG_0568.JPG).
But there's the error
(Error Domain=NSCocoaErrorDomain Code=256 "The file “IMG_0568.JPG”
couldn’t be opened." UserInfo={NSURL=/Users/..../IMG_0568.JPG})
How can I fix this problem?
This is a very common mistake:
URLs in the file system must be initialized with URL(fileURLWithPath
let dataURL = URL(fileURLWithPath: dataURLString)
The difference is:
URL(fileURLWithPath expects a path starting with a slash like /Users/myUser/file.ext
URL(string expects an URL string including the scheme like file:///Users... or http://example.com
However you can avoid the mistake by using the URL related API of Bundle
let dataURL = Bundle.main.url(forResource: "IMG_0568", withExtension: "JPG")!
Related
I have a "normal" swiftUI macOS project, and I need to read some "custom" files like data.dat and data.DCA.
How do I add these extensions to my Xcode project?
At the moment I use the following code to read the data, but for non standard file extensions I just get the error: Error Domain=NSCocoaErrorDomain Code=260 "The file “test.dat” couldn’t be opened because there is no such file." UserInfo={NSFilePath=/Users/UserName/*/RandomAppName/test.dat, NSUnderlyingError=0x600001af0450 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}
let userName = NSUserName()
let path = "/Users/\(userName)/*/RandomAppName/test.dat"
var savedData = Data()
var savedString = String()
do {
let url = URL(fileURLWithPath: path)
savedData = try Data(contentsOf: url)
if let ssavedString = String(data: savedData, encoding: .utf8) {
savedString = ssavedString
print(savedString)
}
} catch {
print(error)
}
I'm trying to read the data from a txt file on macOS. I use String(contentsOf:) and Bundle.main.path(forResource:) like I would on iOS. However, this doesn't work on macOS. I have tried several solutions from other posts but because of macOS they don't seem to work.
Thanks in advance.
Edit:
My code:
let path = Bundle.main.path(forResource: "file", ofType: "txt")! // no error
let url = URL(string: path)! // no error
let contents: String
do {
contents = try String(contentsOf: url)
} catch {
print(error) // Error Domain=NSCocoaErrorDomain Code=262 "The file couldn’t be opened because the specified URL type isn’t supported."
contents = "ERROR"
}
print(contents)
I can save the data to a folder on disk, but I want to ship this file with my app.
URL(string is the wrong API. It's only for URL strings starting with a scheme (http://, file://)
For file system paths you have to use URL(fileURLWithPath.
But in this situation there is a much better way
Replace
let path = Bundle.main.path(forResource: "file", ofType: "txt")!
let url = URL(string: path)! // no error
with
let url = Bundle.main.url(forResource: "file", withExtension: "txt")
I'm trying to copy some (media) files from one folder to another using FileManager's copyItem(at:path:), but I'm getting the error:
CFURLCopyResourcePropertyForKey failed because it was passed an URL which has no scheme
Error Domain=NSCocoaErrorDomain Code=262 "The file couldn’t be opened because the specified URL type isn’t supported."
I'm using Xcode 9 beta and Swift 4.
let fileManager = FileManager.default
let allowedMediaFiles = ["mp4", "avi"]
func isMediaFile(_ file: URL) -> Bool {
return allowedMediaFiles.contains(file.pathExtension)
}
func getMediaFiles(from folder: URL) -> [URL] {
guard let enumerator = fileManager.enumerator(at: folder, includingPropertiesForKeys: []) else { return [] }
return enumerator.allObjects
.flatMap {$0 as? URL}
.filter { $0.lastPathComponent.first != "." && isMediaFile($0)
}
}
func move(files: [URL], to location: URL) {
do {
for fileURL in files {
try fileManager.copyItem(at: fileURL, to: location)
}
} catch (let error) {
print(error)
}
}
let mediaFilesURL = URL(string: "/Users/xxx/Desktop/Media/")!
let moveToFolder = URL(string: "/Users/xxx/Desktop/NewFolder/")!
let mediaFiles = getMediaFiles(from: mediaFilesURL)
move(files: mediaFiles, to: moveToFolder)
The error occurs because
URL(string: "/Users/xxx/Desktop/Media/")!
creates a URL without a scheme. You can use
URL(string: "file:///Users/xxx/Desktop/Media/")!
or, more simply,
URL(fileURLWithPath: "/Users/xxx/Desktop/Media/")
Note also that in fileManager.copyItem() the destination must
include the file name, and not only the destination
directory:
try fileManager.copyItem(at: fileURL,
to: location.appendingPathComponent(fileURL.lastPathComponent))
I have a .GPX file contains routing info of a hiking trip which I want to load into my app. Everything is ok if I load it from remote URL (https://dl.dropboxusercontent.com/u/45741304/appsettings/Phu_si_Lung_05_01_14.gpx) but I can't load this same file from app bundle (already in "Copy bundle resources" and had correct target membership).
Here's my code for loading this file from remote URL:
var xmlParser: XMLParser!
func startParsingFileFromURL(urlString: String) {
guard let url = URL(string: urlString) else {
print("Can't load URL: \(urlString)")
return
}
self.xmlParser = XMLParser(contentsOf: url)
self.xmlParser.delegate = self
let result = self.xmlParser.parse()
print("parse from URL result: \(result)")
if result == false {
print(xmlParser.parserError?.localizedDescription)
}
}
and from the main bundle:
func startParsingFile(fileName: String, fileType: String) {
guard let urlPath = Bundle.main.path(forResource: fileName, ofType: fileType) else {
print("Can't load file \(fileName).\(fileType)")
return
}
guard let url:URL = URL(string: urlPath) else {
print("Error on create URL to read file")
return
}
self.xmlParser = XMLParser(contentsOf: url)
self.xmlParser.delegate = self
let result = self.xmlParser.parse()
print("parse from file result: \(result)")
if result == false {
print(xmlParser.parserError?.localizedDescription)
}
}
Error on load from app bundle:
parse from file result: false
Optional("The operation couldn’t be completed. (Cocoa error -1.)")
You are saying:
guard let urlPath = Bundle.main.path(forResource: fileName, ofType: fileType) else {
print("Can't load file \(fileName).\(fileType)")
return
}
guard let url:URL = URL(string: urlPath) else {
print("Error on create URL to read file")
return
}
First, it is very silly to turn a string path into a URL. You knew you wanted a URL, so why didn't you start by calling url(forResource:...)?
Second, if you ever do turn a string path into a URL, you must make a file URL.
I store an .jpg image i the iOS documents directory. I can write files and read files but when it comes to deleting them it says that there is no such file but that cannot be because I can read it with the same url.
Reading:
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let path = NSURL(fileURLWithPath: paths[0] as String)
let fullPath = path.appendingPathComponent(info["pi"] as! String)
let data = NSData(contentsOf: fullPath!)
Deleting:
let fileManager = FileManager.default
fileManager.delegate = self
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
let path = NSURL(fileURLWithPath: paths[0] as String)
let fullPath = path.appendingPathComponent(info["pi"] as! String)
do {
try fileManager.removeItem(atPath: "\(fullPath!)")
} catch {
print("\(error)")
}
It throws:
Error Domain=NSCocoaErrorDomain Code=4 "“image_496251232.806566.jpg” couldn’t be removed." UserInfo={NSUnderlyingError=0x1758eb40 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}, NSFilePath=file:///var/mobile/Containers/Data/Application/269ADA58-6B09-4844-9FAA-AC2407C1D991/Documents/image_496251232.806566.jpg, NSUserStringVariant=(
Remove
)}
Your fullPath variable is a (optional) URL. To convert that to a file path string, use the .path property, not string interpolation:
fileManager.removeItem(atPath: fullPath!.path)
Or better, use the URL directly without converting it to a path:
fileManager.removeItem(at: fullPath!)
(And get rid of the forced unwrapping in favor of option binding ... :-)