I’m trying to get String from txt file inside the zip file using native libcompression library. Actually I use the code from
https://github.com/mw99/DataCompression/blob/master/Sources/DataCompression.swift.
At first, I was doing:
let zip = try? Data(contentsOf: "/.../test.zip")
let tmp: Data? = zip?.unzip()
let txt: String? = String(data: tmp!, encoding: .utf8)
But how do I get the contents of zip file and how do I get data from certain txt file?
ZIP Foundation supports accessing individual entries in ZIP archives.
You have to initialize an archive by passing a file URL to the Archive initializer.
Afterwards you can access a specific entry via subscripting:
let fileManager = FileManager()
let currentWorkingPath = fileManager.currentDirectoryPath
var archiveURL = URL(fileURLWithPath: currentWorkingPath)
archiveURL.appendPathComponent("test.zip")
guard let archive = Archive(url: archiveURL, accessMode: .read) else {
return
}
guard let entry = archive["file.txt"] else {
return
}
var destinationURL = URL(fileURLWithPath: currentWorkingPath)
destinationURL.appendPathComponent("out.txt")
do {
try archive.extract(entry, to: destinationURL)
} catch {
print("Extracting entry from archive failed with error:\(error)")
}
You can also directly access the contents of entry by using the closure based API. This allows you to process the entry without writing it to the file system first:
try archive.extract(entry, consumer: { (data) in
print(data.count)
})
Related
We get .vcf from Document directory path but can't import to the device using .vcf file URL like
'"Nik1 .vcf":
file:///Users/jksol-niketan/Library/Developer/CoreSimulator/Devices/18ADE140-22E4-4BEA-8C25-886AEE96C2CC/data/Containers/Data/Application/BC6A91A7-2920-4D5D-9787-F6D0E0DAB200/Documents/restore/Nik1%20.vcf'
How can solution for this file path URL to import iPhone device using swift/objective c
I tired of this issue, help with this query solution.
for r in restore{
var data: Data = Data()
do{
let url = URL(fileURLWithPath: r.value.path)
try data = NSData(contentsOf: url) as Data
var usersContact = [CNContact]()
do {
try usersContact = CNContactVCardSerialization.contacts(with: data)
} catch {
print("error")
}
let contact = usersContact[0]
print(contact)
}catch{
print("error")
}
}
Ex. restore = ["Nik1 .vcf":
file:///Users/jksol-niketan/Library/Developer/CoreSimulator/Devices/18ADE140-22E4-4BEA-8C25-886AEE96C2CC/data/Containers/Data/Application/BC6A91A7-2920-4D5D-9787-F6D0E0DAB200/Documents/restore/Nik1%20.vcf]
I am trying to import the content of a .txt file to a string in my Xcode 9 project using Swift 4. When I use the full path name it imports successfully, current code:
let filePath = URL(fileURLWithPath: "/Users/main/Documents/ClaasPDI/PDIapp/PDIapp/holdMachines.txt")
do
{
machineString = try String(contentsOf: filePath)
}
catch
{
print("MACHINE INFORMATION DID NOT IMPORT")
}
I want to be able to import the data from the local path so it can be run on other computers besides mine. My swift files and holdMachines.txt are in the same folder PDIapp but when I change the code to:
let filePath = URL(fileURLWithPath: "holdMachines.txt")
it now crashes my app and says it could not access the file.
I also tried it with a / infront of the file name (below) but that also failed.
let filePath = URL(fileURLWithPath: "/holdMachines.txt")
How can I change my code to access the file through a local file path?
Put the text file in your Xcode project and use the following code to read it into a string:
let txtFile = Bundle.main.path(forResource: "holdMachines", ofType: "txt")
do {
let contents = try? String(contentsOfFile: txtFile!, encoding: .utf8)
} catch let err {
print(err.localizedDescription)
}
I used to read the text files from my application's bundle by using the following code. However, no matter what my application can't find them anymore. I am 100% sure that all my files are in the Assets.xcassets, I can see them, edit them, transform them from a directory to another. But my application doesn't want to read them, please tell me what I missed!!
this is the procedure I am using...
func readBundle(file:String) -> String
{
var res: String = ""
if let path = NSBundle.mainBundle().pathForResource(file, ofType: "txt")
{
let fm = NSFileManager()
let exists = fm.fileExistsAtPath(path)
if(exists)
{
let c = fm.contentsAtPath(path)
res = NSString(data: c!, encoding: NSUTF8StringEncoding) as! String
}
}
return res
}
I am using it like this:
let res = readBundle("test")
print(res)
when storing non image files in XCAssets, you should use NSDataAsset to acccess their content
https://developer.apple.com/library/ios/documentation/UIKit/Reference/NSDataAsset_Class/
func readBundle(file:String) -> String
{
var res = ""
if let asset = NSDataAsset(name: file) ,
string = String(data:asset.data, encoding: NSUTF8StringEncoding){
res = string
}
return res
}
In the another option then 'XCAssets' you can create a separate folder/group of your resources other than images in the project structure, check if they exist in the Copy Bundle Resource in the Build phases section of your project's main target
If you add resource like this your current code should work as it is
func readBundle(file:String) -> String
{
var res: String = ""
if let path = NSBundle.mainBundle().pathForResource(file, ofType: "txt")
{
//you should be able to get the path
//other code as you has written in the question
}
return res
}
I have a video file on S3 that I am trying to save to disk. However, if the file already exists on disk, I want to overwrite it. I wrote this function to download the file but it never saves the file. I can see the progress % increasing. But, how do I access the resulting file and save it to disk?
var finalPath: NSURL?
Alamofire.download(.GET, s3Url) { temporaryURL, response in
let fileManager = NSFileManager.defaultManager()
if let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as? NSURL {
let pathComponent = response.suggestedFilename
finalPath = directoryURL.URLByAppendingPathComponent(pathComponent!)
println(finalPath)
//remove the file if it exists
if fileManager.fileExistsAtPath(finalPath!.absoluteString!) {
println("file exists on disk, removing..")
fileManager.removeItemAtPath(finalPath!.absoluteString!, error: nil)
}
return finalPath!
}
return temporaryURL
}
.validate()
.progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
let progress = (Double(totalBytesRead) / Double(totalBytesExpectedToRead)) * 100
println(String(format: "%.2f", progress))
}
.response { request, response, data, error in
println(request)
println(response)
if let mediaData = data {
println("saving file to disk")
mediaData.writeToURL(finalPath!, atomically: true)
}
}
Normally I would use the example provided in the docs, but It fails if the file already exists. ie:
let destination = Alamofire.Request.suggestedDownloadDestination(directory: .DocumentDirectory, domain: .UserDomainMask)
So, how can I download the file, overwrite it if it exists and record the path that the file is written to to my coreData database?
You need to delete the file first. Alamofire only tries to move the file from the temp location to the final location that you provide in the destination closure.
You can create an extension on Alamofire.DownloadRequest to provide options for how to download the file where you can use the option DownloadRequest.DownloadOptions.removePreviousFile.
for details on how to do that see my answer to this question.
I'm trying to learn the new Swift programming language. It looks great, but I'm having a difficult time doing something as simple as reading the content of a local .txt file.
I have tried the few examples I could find through Google, but they give compile errors, like this answer here: Read and write data from text file
If I tweak the code a bit, it works, but can only read from a special location within the project.
Why isn't it just as simple to read a .txt file with Swift as it is with for instance Ruby? And how would I go about reading the content of a file located at ~/file.txt?
Thnx
If you have a tilde in your path you can try this:
let location = "~/file.txt".stringByExpandingTildeInPath
let fileContent = NSString(contentsOfFile: location, encoding: NSUTF8StringEncoding, error: nil)
otherwise just use this:
let location = "/Users/you/Desktop/test.txt"
let fileContent = NSString(contentsOfFile: location, encoding: NSUTF8StringEncoding, error: nil)
This gives you a string representation of the file, which I assumed is what you want.
You can use NSData(contentsOfFile: location) to get a binary representation, but you would normally do that for, say, music files and not a text file.
Update: With Xcode 7 and Swift 2 this doesn't work anymore. You can now use
let location = NSString(string:"~/file.txt").stringByExpandingTildeInPath
let fileContent = try? NSString(contentsOfFile: location, encoding: NSUTF8StringEncoding)
let file = "/Users/user/Documents/text.txt"
let path=URL(fileURLWithPath: file)
let text=try? String(contentsOf: path)
This would work:
let path = "~/file.txt"
let expandedPath = path.stringByExpandingTildeInPath
let data: NSData? = NSData(contentsOfFile: expandedPath)
if let fileData = data {
let content = NSString(data: fileData, encoding:NSUTF8StringEncoding) as String
}
Note that data may be nil, so you should check for that.
EDIT:
Don't forget conditional unwrapping - looks much nicer ;)
Relative path tip:
Instead of doing this:
NSString("~/file.txt").stringByExpandingTildeInPath
You can do this:
"\(NSHomeDirectory())/file.txt"
You may find this tool useful to not only read from file in Swift but also parse it simultaneously: https://github.com/shoumikhin/StreamScanner
Just specify the file path and data delimiters like this (see readme for more options):
import StreamScanner
if let input = NSFileHandle(forReadingAtPath: "/file/path")
{
let scanner = StreamScanner(source: input, delimiters: NSCharacterSet(charactersInString: ":\n")) //separate data by colons and newlines
while let field: String = scanner.read()
{
//use field
}
}
Hope, this helps.
Using the answer by Atomix, this will work in Swift 4:
let location = NSString(string: "~/test.txt").expandingTildeInPath
let fileContent = try? NSString(contentsOfFile: location, encoding: String.Encoding.utf8.rawValue)
This worked for me in Swift 2.1, XCode7 to get the location and print the contents of CSV. ( you can create a simple CSV in Text Wrangler)
override func viewDidLoad() {
super.viewDidLoad()
let location = NSString(string:"/Users/*Myusername*/Documents/myCSVfile.csv")
let fileContent = try? NSString(contentsOfFile: location as String, encoding: NSUTF8StringEncoding)
print(fileContent)
}
Swift 4:
let filePath = "/Users/UserName/Desktop/FolderName/FileName.txt"
let fullPath = NSString(string: filePath).expandingTildeInPath
do
{
let fileContent = try NSString(contentsOfFile: fullPath, encoding: String.Encoding.utf8.rawValue)
print(fileContent)
}
catch
{
print(error)
}
filename doesn't need to have scheme like file://, and can be relative like ../docs/test.txt.
Remember to catch any error thrown, or rethrow.
let url = URL(fileURLWithPath: filename)
let contents = try String(contentsOf: url, encoding: .utf8)