I wrote the code as below
if MFMailComposeViewController.canSendMail()
{
let mail = MFMailComposeViewController()
mail.mailComposeDelegate = self
let fileName = "sampleText"
let url = "textFiles/sampleText.txt"
do{
let data = try Data(contentsOf: url)
mail.addAttachmentData(data, mimeType: "txt", fileName: fileName)
present(mail, animated: true)
}catch {
print("error ...")
}
} else {
}
I get the following error
Cannot convert value of type 'String' to expected argument type 'URL'
The file structure of my Xcode looks like the image below
How do I clear the error?
You need to load it like
guard let url = Bundle.main.url(forResource: "sampleText", withExtension: "txt") else { return }
Note : folders with yellow colors textFiles are fake while ones with blue colors are true
Related
In a different question I asked how to save files on a directory of the user's choosing. The reply was the following code, which works great.
func resolveURL(for key: String) throws -> URL {
if let data = UserDefaults.standard.data(forKey: key) {
var isStale = false
let url = try URL(resolvingBookmarkData: data, options:[.withSecurityScope], bookmarkDataIsStale: &isStale)
if isStale {
let newData = try url.bookmarkData(options: [.withSecurityScope])
UserDefaults.standard.set(newData, forKey: key)
}
return url
} else {
let panel = NSOpenPanel()
panel.allowsMultipleSelection = false
panel.canChooseDirectories = true
panel.canCreateDirectories = true
panel.canChooseFiles = false
if panel.runModal() == .OK,
let url = panel.url {
let newData = try url.bookmarkData(options: [.withSecurityScope])
UserDefaults.standard.set(newData, forKey: key)
return url
} else {
throw ResolveError.cancelled
}
}
}
func saveFile(filename: String, contents: String) {
do {
let directoryURL = try resolveURL(for: "savedDirectory")
let documentURL = directoryURL.appendingPathComponent (filename + ".txt")
print("saving " + documentURL.absoluteString)
try directoryURL.accessSecurityScopedResource(at: documentURL) { url in
try contents.write (to: url, atomically: false, encoding: .utf8)
}
} catch let error as ResolveError {
print("Resolve error:", error)
} catch {
print(error)
}
}
Now, the next step is to go to the directory the user chose when the app loads, and if any files are there, ready each one and add the contents of those files to the struct I use to hold the data.
Googling a little bit I found that you can read all files in a directory using FileManager.default.contentsOfDirectory so I wrote:
func loadFiles() {
do {
let directoryURL = try resolveURL(for: "savedDirectory")
let contents = try FileManager.default.contentsOfDirectory(at: directoryURL,
includingPropertiesForKeys: nil,
options: [.skipsHiddenFiles])
for file in contents {
print(file.absoluteString)
}
} catch let error as ResolveError {
print("Resolve error:", error)
return
} catch {
print(error)
return
}
}
But, I get the following error:
Error Domain=NSCocoaErrorDomain Code=257 "The file “myFiles” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///Users/aleph/myFiles, NSFilePath=/Users/aleph/myFiles, NSUnderlyingError=0x600000704ba0 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}
which looking at my code I would guess it's happening because I'm not using directoryURL.accessSecurityScopedResource. I tried to add that, or find any other way, but I'm running into a block and I don't know how to get to the directory saved in savedDirectory, and go through every file, reading its contents.
Thank you for any help
If I use:
directoryURL.startAccessingSecurityScopedResource()
// load the files
directoryURL.stopAccessingSecurityScopedResource()
Then it works.
I am using in my project safari content blocker extension. when i set the rule in blockerList.json file statically and run the project every thing is working fine. Now i want to set my rule dynamically using the technic as it describes in below.
Guys please help me out to set the rule dynamically at run time.
I try this but i am getting an error when
load from viewcontroller class
fileprivate func saveRuleFile() {
let ruleList = [["trigger":["url-filter": ".*"],"action":["type": "block"]]]
let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted
if let encoded = try? encoder.encode(ruleList) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
print("sharedContainerURL = \(String(describing: sharedContainerURL))")
if let json = String(data: encoded, encoding: .utf8) {
print(json)
}
if let destinationURL = sharedContainerURL?.appendingPathComponent("Rules.json") {
do {
try encoded.write(to: destinationURL)
} catch {
print (error)
}
}
}
}
And write this in ContentBlockerRequestHandler class
func beginRequest(with context: NSExtensionContext) {
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
let sourceURL = sharedContainerURL?.appendingPathComponent("Rules.json")
let ruleAttachment = NSItemProvider(contentsOf: sourceURL)
let item = NSExtensionItem()
item.attachments = ([ruleAttachment] as! [NSItemProvider])
context.completeRequest(returningItems: [item], completionHandler: nil)
}
i try to load using
SFContentBlockerManager.reloadContentBlocker(withIdentifier: "com.app.*****", completionHandler: {(error) in
if error != nil{
print("error: \(error.debugDescription)")
}
})
when try to execute 3rd number block at run time i'm getting an error. But i go to the file path and checked the json is absolutely fine, its a valid json there.
Error Domain=WKErrorDomain Code=2 "(null)" UserInfo={NSHelpAnchor=Rule list compilation failed: Failed to parse the JSON String.}
Try to use JSONSerialization. It work great for me :)
fileprivate func saveRuleFile() {
let ruleList = [["trigger":["url-filter": ".*"],"action":["type": "block"]]]
let jsonAsData = try! JSONSerialization.data(withJSONObject: ruleList)
let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.****.***")
print("sharedContainerURL = \(String(describing: sharedContainerURL))")
if let destinationURL = sharedContainerURL?.appendingPathComponent("Rules.json") {
do {
try jsonAsData.write(to: destinationURL)
} catch {
print (error)
}
}
}
I'm trying to Export my Database.
I've tried by Email and by sharing it.
The thing is that I want to export the current state of the dataBase (with all the information in it).
I've tried this code :
func exportDatabase(){
var url:String = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last! as String
url = url + "/WalletDatabase.sqlite"
let fileManager = FileManager.default
if fileManager.fileExists(atPath: url) {
sendMail(sUrl: url)
}else{
print("error")
}
}
func sendMail(sUrl:String){
if( MFMailComposeViewController.canSendMail() ) {
print("Can send email.")
let fileManager = FileManager.default
let mailComposer = MFMailComposeViewController()
mailComposer.setToRecipients(["***#gmail.com"])
mailComposer.mailComposeDelegate = self
//Set the subject and message of the email
mailComposer.setSubject("Lorem Ipsum")
mailComposer.setMessageBody("Lorem Ipsum.", isHTML: false)
if let fileData = NSData(contentsOfFile: sUrl) {
print("File data loaded.")
mailComposer.addAttachmentData(fileData as Data, mimeType: "application/x-sqlite3", fileName: "WalletDatabase")
}
let fileData = fileManager.contents(atPath: sUrl)
} else {
print("error")
}
But :
The file send doesn't have any type
The database is empty, only the table and col remain
Could you guys give me a little help
I fix it by adding this following code :
static func migrateStoreSwift() -> NSURL
{
let lApp:AppController = UIApplication.shared.delegate as! AppController;
let lCurrentStore:NSPersistentStore = lApp.persistentStoreCoordinator.persistentStores.last!
let lNewDataBase = "Database.sqlite"
let lNewStoreURL:NSURL = lApp.applicationDocumentsDirectory()?.appendingPathComponent(lNewDataBase) as! NSURL
try! lApp.persistentStoreCoordinator.migratePersistentStore(lCurrentStore, to: lNewStoreURL as URL, options: nil, withType: NSSQLiteStoreType)
return lNewStoreURL
}
This code create a copy of the current version of the database.
I am trying to append a string into text file. I am using the following code.
let dirs : [String]? = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String]
if (dirs) != nil {
let dir = dirs![0] //documents directory
let path = dir.stringByAppendingPathComponent("votes")
let text = "some text"
//writing
text.writeToFile(path, atomically: true, encoding: NSUTF8StringEncoding, error: nil)
//reading
let text2 = String(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)
println(text2) //prints some text
}
this does not append the string to file. Even if I call this function repeatedly.
If you want to be able to control whether to append or not, consider using OutputStream. For example:
do {
let fileURL = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
.appendingPathComponent("votes.txt")
guard let outputStream = OutputStream(url: fileURL, append: true) else {
print("Unable to open file")
return
}
outputStream.open()
let text = "some text\n"
try outputStream.write(text)
outputStream.close()
} catch {
print(error)
}
By the way, this is an extension that lets you easily write a String (or Data) to an OutputStream:
extension OutputStream {
enum OutputStreamError: Error {
case stringConversionFailure
case bufferFailure
case writeFailure
}
/// Write `String` to `OutputStream`
///
/// - parameter string: The `String` to write.
/// - parameter encoding: The `String.Encoding` to use when writing the string. This will default to `.utf8`.
/// - parameter allowLossyConversion: Whether to permit lossy conversion when writing the string. Defaults to `false`.
func write(_ string: String, encoding: String.Encoding = .utf8, allowLossyConversion: Bool = false) throws {
guard let data = string.data(using: encoding, allowLossyConversion: allowLossyConversion) else {
throw OutputStreamError.stringConversionFailure
}
try write(data)
}
/// Write `Data` to `OutputStream`
///
/// - parameter data: The `Data` to write.
func write(_ data: Data) throws {
try data.withUnsafeBytes { (buffer: UnsafeRawBufferPointer) throws in
guard var pointer = buffer.baseAddress?.assumingMemoryBound(to: UInt8.self) else {
throw OutputStreamError.bufferFailure
}
var bytesRemaining = buffer.count
while bytesRemaining > 0 {
let bytesWritten = write(pointer, maxLength: bytesRemaining)
if bytesWritten < 0 {
throw OutputStreamError.writeFailure
}
bytesRemaining -= bytesWritten
pointer += bytesWritten
}
}
}
}
For Swift 2 rendition, see previous revision of this answer.
You can also use FileHandle to append String to your text file. If you just want to append your string the end of your text file just call seekToEndOfFile method, write your string data and just close it when you are done:
FileHandle usage Swift 3 or Later
let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
// create a new text file at your documents directory or use an existing text file resource url
let fileURL = documentsDirectory.appendingPathComponent("simpleText.txt")
do {
try Data("Hello World\n".utf8).write(to: fileURL)
} catch {
print(error)
}
// open your text file and set the file pointer at the end of it
do {
let fileHandle = try FileHandle(forWritingTo: fileURL)
fileHandle.seekToEndOfFile()
// convert your string to data or load it from another resource
let str = "Line 1\nLine 2\n"
let textData = Data(str.utf8)
// append your text to your text file
fileHandle.write(textData)
// close it when done
fileHandle.closeFile()
// testing/reading the file edited
if let text = try? String(contentsOf: fileURL, encoding: .utf8) {
print(text) // "Hello World\nLine 1\nLine 2\n\n"
}
} catch {
print(error)
}
Please check the below code as its working for me. Just Add the code as it is:
let theDocumetFolderSavingFiles = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
let filePath = "/theUserData.txt"
let thePathToFile = theDocumetFolderSavingFiles.stringByAppendingString(filePath)
let theFileManager = NSFileManager.defaultManager()
if(theFileManager.fileExistsAtPath(thePathToFile)){
do {
let stringToStore = "Hello working fine"
try stringToStore.writeToFile(thePathToFile, atomically: true, encoding: NSUTF8StringEncoding)
}catch let error as NSError {
print("we are geting exception\(error.domain)")
}
do{
let fetchResult = try NSString(contentsOfFile: thePathToFile, encoding: NSUTF8StringEncoding)
print("The Result is:-- \(fetchResult)")
}catch let errorFound as NSError{
print("\(errorFound)")
}
}else
{
// Code to Delete file if existing
do{
try theFileManager.removeItemAtPath(thePathToFile)
}catch let erorFound as NSError{
print(erorFound)
}
}
A simple solution that works for me. UPDATE, it looks like I must have gotten this from here, so credit where credit is due:
Append text or data to text file in Swift
Usage:
"Hello, world".appendToURL(fileURL: url)
Code:
extension String {
func appendToURL(fileURL: URL) throws {
let data = self.data(using: String.Encoding.utf8)!
try data.append(fileURL: fileURL)
}
}
extension Data {
func append(fileURL: URL) throws {
if let fileHandle = FileHandle(forWritingAtPath: fileURL.path) {
defer {
fileHandle.closeFile()
}
fileHandle.seekToEndOfFile()
fileHandle.write(self)
}
else {
try write(to: fileURL, options: .atomic)
}
}
}
Check the reading part.
The method cotentsOfFile: is a method of NSString class. And you have use it wrong way.
So replace this line
let text2 = String(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)
Here you have to use NSString instead of String class.
let text2 = NSString(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)
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.