How to check if a file exists in Documents folder

Question

I have an application with In-App Purchase  that when the user buy something  download one html file into the Documents folder of my app   Now I must check if this HTML file exists  so if true  load this HTML file  else load my default html page   How I can do that  With NSFileManager I can t get outside of mainBundle

User · Accepted Answer

Swift 3   let documentsURL   try  FileManager   url for   documentDirectory                                            in   userDomainMask                                            appropriateFor  nil                                            create  true        gives you a file URL of the documents directory  The following checks if there s a file named foo html   let fooURL   documentsURL appendingPathComponent  foo html   let fileExists   FileManager   fileExists atPath  fooURL path    Objective-C   NSString  documentsPath   NSSearchPathForDirectoriesInDomains NSDocumentDirectory  NSUserDomainMask  YES  0    NSString  foofile    documentsPath stringByAppendingPathComponent   foo html    BOOL fileExists     NSFileManager defaultManager  fileExistsAtPath foofile

User · Answer

NSURL h provided -  BOOL checkResourceIsReachableAndReturnError  NSError    error to do so  NSURL  fileURL    NSURL fileURLWithPath NSHomeDirectory     NSError     autoreleasing error   nil  if   fileURL checkResourceIsReachableAndReturnError  amp error         NSLog      exists   fileURL     else       NSLog      existence checking error       fileURL  error       Or using Swift  if let url   URL fileURLWithPath  NSHomeDirectory          do           let result   try url checkResourceIsReachable         catch           print error

User · Answer

Swift 2 0   This is how to check if the file exists using Swift  func isFileExistsInDirectory   - gt  Bool       let paths   NSSearchPathForDirectoriesInDomains NSSearchPathDirectory DocumentDirectory  NSSearchPathDomainMask UserDomainMask  true      let documentsDirectory  AnyObject   paths 0      let dataPath   documentsDirectory stringByAppendingPathComponent   YourFileName        return NSFileManager defaultManager   fileExistsAtPath dataPath

User · Answer

NSArray  directoryPath   NSSearchPathForDirectoriesInDomains NSDocumentDirectory NSUserDomainMask YES   NSString  imagePath     directoryPath objectAtIndex 0     If you have superate folder imagePath   imagePath stringByAppendingPathComponent   ImagesFolder     Get docs dir path with folder name  imageName     imageName stringByAppendingString    jpg     Assign image name imagePath   imagePath stringByAppendingPathComponent  imageName   NSLog        imagePath      Method 1  BOOL file     NSFileManager defaultManager  fileExistsAtPath  imagePath   if  file    NO       NSLog  File not exist      else       NSLog  File exist         Method 2  NSData  data    NSData dataWithContentsOfFile imagePath   UIImage  image    UIImage imageWithData data   if    image    nil      Check image exist or not     cell photoImageView image   image   Display image

User · Answer

If you set up your file system differently or looking for a different way of setting up a file system and then checking if a file exists in the documents folder heres an another example  also show dynamic checking  for  int i   0  i  lt  numberHere    i       NSFileManager  fileMgr    NSFileManager defaultManager       NSString  documentsDirectory    NSHomeDirectory   stringByAppendingPathComponent   Documents        NSString  imageName    NSString stringWithFormat   image-   png   i       NSString  currentFile    documentsDirectory stringByAppendingPathComponent imageName       BOOL fileExists    fileMgr fileExistsAtPath currentFile       if  fileExists    NO           cout  lt  lt   DOESNT Exist    lt  lt  endl        else           cout  lt  lt   DOES Exist    lt  lt  endl

User · Answer

check if file exist in side the document catchimage path    NSString  stringPath    NSSearchPathForDirectoriesInDomains NSDocumentDirectory  NSUserDomainMask  YES objectAtIndex 0   NSString  tempName    NSString stringWithFormat      catchimage    png  stringPath   file name    NSLog       temName   if   NSFileManager defaultManager  fileExistsAtPath temName           ur code here   else          ur code here

User · Answer

Apple recommends against relying on the fileExistAtPath  method  It s often better to just try to open a file and deal with the error if the file does not exist   NSFileManager Class Reference Note  Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended  Doing so can cause odd behavior or race conditions  It s far better to attempt an operation  such as loading a file or creating a directory   check for errors  and handle those errors gracefully than it is to try to figure out ahead of time whether the operation will succeed  For more information on file system race conditions  see    Race Conditions and Secure File Operations    in Secure Coding Guide   Source  Apple Developer API Reference From the secure coding guide   To prevent this  programs often check to make sure a temporary file with a specific name does not already exist in the target directory  If such a file exists  the application deletes it or chooses a new name for the temporary file to avoid conflict  If the file does not exist  the application opens the file for writing  because the system routine that opens a file for writing automatically creates a new file if none exists  An attacker  by continuously running a program that creates a new temporary file with the appropriate name  can  with a little persistence and some luck  create the file in the gap between when the application checked to make sure the temporary file didn   t exist and when it opens it for writing  The application then opens the attacker   s file and writes to it  remember  the system routine opens an existing file if there is one  and creates a new file only if there is no existing file   The attacker   s file might have different access permissions than the application   s temporary file  so the attacker can then read the contents  Alternatively  the attacker might have the file already open  The attacker could replace the file with a hard link or symbolic link to some other file  either one owned by the attacker or an existing system file   For example  the attacker could replace the file with a symbolic link to the system password file  so that after the attack  the system passwords have been corrupted to the point that no one  including the system administrator  can log in

[ios] How to check if a file exists in Documents folder?

Swift 3:

Objective-C:

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