how to write bytes data in file swift - ios

Question

data coming from server is in ex.2035bytes I want to write this data in to file I am writing but data is not showing
Alamofire.request(url , method: .post, parameters: Parameters as? [String: Any] , encoding: URLEncoding.httpBody, headers: [
"Content-Type": "application/x-www-form-urlencoded"
]).responseData{ (response) in
print(response)
print(response.result.value!)
print(response.result.description)
guard let jsonData = response.result.value ,response.result.isSuccess else {
didFail(response.result.error!)
return
}
guard let id = ApplicantModel.shared.applicationId else {
return
}
let file = "application_\(id)" //this is the file. we will write to and read from it
let documentsPath1 = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
//let logsPath = documentsPath1.appendingPathComponent("f")
let fileURL = documentsPath1.appendingPathComponent("file")
let data: Data = response.result.value!
// print(logsPath)
//writing
do {
try FileManager.default.createDirectory(at: documentsPath1 as URL, withIntermediateDirectories: true, attributes: nil)
//try data.write(to: fileURL!, atomically: false, encoding: .utf8)
// try data.write(to: fileURL!, options: Data.WritingOptions.atomic)
try data.write(to: fileURL!) )
}
catch {/* error handling here */}
let json = JSON(jsonData)
didFinish(json)
}
here I am creating file and writing data in to it but its not showing

Answer 1

You can use this function to write data. Code is self explanatory, but I tried to make it more clear.
func writeToFile(data: Data, fileName: String){
// get path of directory
guard let directory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last else {
return
}
// create file url
let fileurl = directory.appendingPathComponent("\(fileName).txt")
// if file exists then write data
if FileManager.default.fileExists(atPath: fileurl.path) {
if let fileHandle = FileHandle(forWritingAtPath: fileurl.path) {
// seekToEndOfFile, writes data at the last of file(appends not override)
fileHandle.seekToEndOfFile()
fileHandle.write(data)
fileHandle.closeFile()
}
else {
print("Can't open file to write.")
}
}
else {
// if file does not exist write data for the first time
do{
try data.write(to: fileurl, options: .atomic)
}catch {
print("Unable to write in new file.")
}
}
}

Answer 2

You have a problem with creating the directory and naming the file you need to change it like this
let file = "application_\(id)"
let documentsPath1 = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let logsPath = documentsPath1.appendingPathComponent("file")
do
{
try FileManager.default.createDirectory(atPath: logsPath!.path, withIntermediateDirectories: true, attributes: nil)
let fileURL = logsPath?.appendingPathComponent(file)
try data.write(to: fileURL!)
}
catch let error as NSError
{
NSLog("Unable to create directory \(error.debugDescription)")
}

Answer 3

I think you create a wrong folder. It due to you can't save that file in your folder. You can look at my example. Which I create 1 folder to contain files.
Step1: Get document path
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
Step2: create a destination URL. Where you would like to store
let url = paths[0].appendingPathComponent(self.fileImagejpeg)
Step 3: Write data in files
try? data.write(to: url)
You can use try catch to get log when write failure