How to save text file without overwritng in objective c

Question

I am trying to write NSString to the file. It is writing successfully however I want to append the new string to new line.

How can do this?

Do you have problem appending the string, or appending it on a new line? — sisve, May 02 '12 at 05:03
i want to write /update my file periodically so i want previous data and new one also — user968597, May 02 '12 at 05:14
Yes, but what is the current problem? That you overwrite the existing file everytime you write, causing old data to disappear? — sisve, May 02 '12 at 05:31
yes correct i tried with seekToFileOffset of nsfile still not getting desired write . — user968597, May 02 '12 at 05:34
And what is your current misbehaving code? Could you show us the code you got? — sisve, May 02 '12 at 06:20
You can use seekToEndOfFile: http://stackoverflow.com/questions/4779877/how-to-write-in-append-mode-for-text-file — user523234, May 02 '12 at 06:52

score 1 · Accepted Answer · answered May 02 '12 at 06:28

You can read file content, append new data to that content and save new data to a file you use:

// Here you set your appending text.    
NSString *yourAppendingText = @"yourAppendingText";  

// Here you get access to the file in Documents directory of your application bundle.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [paths objectAtIndex:0];
NSString *documentFile = [documentDir stringByAppendingPathComponent:@"yourFile.txt"];

// Here you read current existing text from that file
NSString *textFromFile = [NSString stringWithContentsOfFile:documentFile encoding:NSUTF8StringEncoding error:nil];
// Here you append new text to the existing one
NSString *textToFile = [textFromFile stringByAppendingString:yourAppendingText];
// Here you save the updated text to that file
[textToFile writeToFile:documentFile atomically:YES encoding:NSUTF8StringEncoding error:nil];

How to save text file without overwritng in objective c

1 Answers1