Using the document directory to store files

Does File Exist

 NSString *path;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectory"];
 path = [path stringByAppendingPathComponent:@"SomeFileName"];
 if ([[NSFileManager defaultManager] fileExistsAtPath:path])
 {

Delete File

 NSString *path;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectory"];
 path = [path stringByAppendingPathComponent:@"SomeFileName"];
 NSError *error;
 if ([[NSFileManager defaultManager] fileExistsAtPath:path])  //Does file exist?
 {
  if (![[NSFileManager defaultManager] removeItemAtPath:path error:&error]) //Delete it
  {
   NSLog(@"Delete file error: %@", error);
  }
 }

Delete DIrectory

 NSString *path;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectoryName"];
 NSError *error; 

 if ([[NSFileManager defaultManager] fileExistsAtPath:path]) //Does directory exist?
 {
  if (![[NSFileManager defaultManager] removeItemAtPath:path error:&error]) //Delete it
  {
   NSLog(@"Delete directory error: %@", error);
  }
 }

Create Directory

 NSString *path;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectoryName"];
 NSError *error;
 if (![[NSFileManager defaultManager] fileExistsAtPath:path]) //Does directory already exist?
 {
  if (![[NSFileManager defaultManager] createDirectoryAtPath:path
            withIntermediateDirectories:NO
              attributes:nil
                error:&error])
  {
   NSLog(@"Create directory error: %@", error);
  }
 }

Save NSData File

 NSData *file;
 file = ...
 NSString *path;
 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectoryName"];
 path = [path stringByAppendingPathComponent:@"SomeFileName"];

        [[NSFileManager defaultManager] createFileAtPath:path
                                                        contents:FileData
                                                      attributes:nil];

You can test the bool result of createFileAtPath if desired. A common reason for it to fail is if you are writing to a directory that doesn’t exist – you have to create the directory first.

Load File

    NSString *path;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"My Directory"];
    path = [path stringByAppendingPathComponent:@"My Filename"];

    if ([[NSFileManager defaultManager] fileExistsAtPath:path])
    {
        //File exists
        NSData *file1 = [[NSData alloc] initWithContentsOfFile:path];
        if (file1)
        {
            [self MyFunctionWantingAFile:file1];
            [file1 release];

        }
    }
    else
    {
        NSLog(@"File does not exist");
    }

Move File

 [[NSFileManager defaultManager] moveItemAtPath:MySourcePath toPath:MyDestPath error:nil];

List Files

    //----- LIST ALL FILES -----
    NSLog(@"LISTING ALL FILES FOUND");

    int Count;
    NSString *path;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectoryName"];
    NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];
    for (Count = 0; Count < (int)[directoryContent count]; Count++)
    {
        NSLog(@"File %d: %@", (Count + 1), [directoryContent objectAtIndex:Count]);
    }

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