nsfilehandle

I used to do coding in java but now I want to move my app to iOS using swift 2. So I want a method to append text in new line to an existing txt file in app documents. I searched and tried so many methods but its all overwriting to new txt file In java i used this method PrintWriter out=null; try { out=new PrintWriter(new FileWriter("file.txt",true)); out.println("some txt"} out.close(); } catch (IOException e) { e.printStackTrace(); } I think you must use NSFileHandle : let dir:NSURL = NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.CachesDirectory, inDomains:

So, this is my code : - (void)runCmd:(NSString *)cmd withArgs:(NSArray *)args { NSLog(@"\nRunning ::\n\tCmd : %@\n\tArgs : %@",cmd, args); [theSpinner start]; if (task) { [task interrupt]; } else { task = [[NSTask alloc] init]; [task setLaunchPath:cmd]; [task setArguments:args]; [pipe release]; pipe = [[NSPipe alloc] init]; [task setStandardOutput:pipe]; NSFileHandle* fh = [pipe fileHandleForReading]; NSNotificationCenter* nc; nc = [NSNotificationCenter defaultCenter]; [nc removeObserver:self]; [nc addObserver:self selector:@selector(dataReady:) name:NSFileHandleReadCompletionNotification

I want to store pictures taken from camera and video recordings from my application in a separate folder in temporary directories for a while. And as the task is being completed, they shall be going to save into the database. How do I save pictures taken from camera & video recording files in a separate folder in temp directories? You are looking for this to get tot he caches folder to store temporary files: NSString* path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; From there you can use NSFileManager to create and remove the directories you

First of all, I am new to iOS and Swift and come from a background of Android/Java programming. So to me the idea of catching an exception from an attempt to write to a file is second nature, in case of lack of space, file permissions problems, or whatever else can possibly happen to a file (and has happened, in my experience). I also understand that in Swift, exceptions are different from Android/Java ones, so that's not what I'm asking about here. I am attempting to append to a file using NSFileHandle, like so: let fileHandle: NSFileHandle? = NSFileHandle(forUpdatingAtPath: filename) if

I have an NSString that has hex information such as <00000020 66747970 4d344120 00000000 4d344120 6d703432 69736f6d 00000000 00031203 which came from NSData. What I need to do is convert that NSString of Hex data to Ascii which would be: [0][0][0] ftypM4A [0][0][0][0]M4A mp42isom[0][0][0][0][0][3][18][3] As you might be able to tell this is a M4A file. I loaded the first part of the file in to NSData using NSFileHandle. I then stored it into NSString: NSData *data = [filehandle readDataOfLength:1000]; NSString *str = [[NSString alloc]initWithString:[NSString stringWithFormat:@"%@",data]];