Question

I need to write a string into a file. For that, my code is:

-(void)writeToFile:(NSString *)fileName: (NSString *)data {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    // the path to write file
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
    [data writeToFile:appFile atomically:YES];  
}

I am calling this method like this

ownServices *obj = [[ownServices alloc]init];
[obj writeToFile:@"iphone.txt" :@"this is mahesh babu"];

but it didn’t write into the text file.

What’s the reason? Can anyone please help me.

Thank u in advance.

Answer 1

Firstly, you are calling your method strangely. Rename the method to

-(void)writeString:(NSString *) data toFile:(NSString *)fileName

and call it like so:

[obj writeString:@"this is mahesh babu" toFile:@"iphone.txt"];

Secondly, writeToFile:atomically: is deprecated, use writeToFile:atomically:encoding:error::

NSError *error = nil;
BOOL success = [data writeToFile:appFile  atomically:YES encoding:NSUTF8Encoding error:&error];
if (!success) {
    NSLog(@"Error: %@", [error userInfo]);
}

This way, you also see what the error is.