delete files from database permanently ios - ios

Question

I am Making an Audio recorder(m4a extension files). I am Giving a particular URL for the output of the recorded File(in directory).
I am able to play it, save the path of the file in database and can retrieve it later. EVery thing is going Fine. BUT I am not able to delete the saved/unsaved files. Every time I record an audio , the file is taking a permanent space. Am not able to delete them.
I tried it over internet(stackoverflow ofcourse). I got Links like this: I have video URL and want to delete it from the iPhone using this URl
But they are showing COCOA ERROR 4 when ever i try to delete them using codes like this: [[NSFileManager defaultManager] removeItemAtPath:strPath error:&error];
Please suggest, and reply

Answer 1

You typically accomplish this for resources you've saved in your Apps documents directory like this:
unlink([pathForURL UTF8String]);
where pathForURL is an NSString that describes the path to the resource you're deleting.

Answer 2

This is the path earlier i was getting , at which i was unable to write file
/var/mobile/Applications/8584F54E-75D2-4833-8826-29C125E53DBC/Library/Documentation/291013193758w.png
This morning, I just run my code once again ,. now its showing path
/var/mobile/Applications/DDA14123-6A88-4756-B2E4-C4A3AA39AA5B/Documents/291013081335test.png
on this path am able to write my file
the Difference between two paths is that, first one is of Library/Documentation , where as second one is of Documents
dont know the difference, but it is working now

Answer 3

There may be case that file path which you provide is not correct. If its correct then try following with URL, it might solve your issue
NSString *str= [outputFieldURL absoluteString];
NSError *error;
NSURL *url = [NSURL URLWithString:str];
BOOL success = [[NSFileManager defaultManager] removeItemAtURL:url error:&error];
if (!success) {
NSLog(#"Error removing file at path: %#", error.localizedDescription);
}
else
{
NSLog(#"File removed at path: %#", error.localizedDescription);
}
}
Before deleting the file you have to check file there or not :
NSFileManager* manager = [[NSFileManager alloc] init];
if ([manager fileExistsAtPath:path]) {
[manager removeItemAtPath:path error:&error];
}