Convert mp3 audio string to .mp3 audio file in iOS

Question

I got base64 string of .mp3 from server

   NSData *audioData = [[NSData alloc]initWithBase64EncodedString:[dictResult      
     objectForKey:@"voiceString"] options:0];

here I got Audio Data object audioData(30571bytes).

using following code I am trying to save nsdata object to .mp3 file in temp directory.

  NSURL *audioFileURL = [NSURL fileURLWithPath:[NSTemporaryDirectory()  
     stringByAppendingString:objAddXpnseconfigFromRcnt.bAudioName]];

  [audioData writeToFile:[audioFileURL absoluteString] atomically:YES];

but the above code is not working?

the method writeToFile:atomically: doesn't create audio file in temp directory.

Answer 1

The problem lies in the path you are creating:

[NSTemporaryDirectory() stringByAppendingString:objAddXpnseconfigFromRcnt.bAudioName]

Should of course be

[NSTemporaryDirectory() stringByAppendingPathComponent:objAddXpnseconfigFromRcnt.bAudioName]

As you can see I use the stringByAppendingPathComponentL: which will correctly append the filename.

And Why are are creating a NSURL for the file path only to convert it back to path?

---

Also it is good practice to not write everything in one line and always make use of the methods with have an error: parameter. This wil make debugging easier, the following code is the same but way easier to debug:

NSString *tempPath = NSTemporaryDirectory();
NSString *fileName = [tempPath stringByAppendingPathComponent:objAddXpnseconfigFromRcnt.bAudioName];
NSURL *audioFileURL = [NSURL fileURLWithPath:fileName];

NSError *error = nil;
if (![audioData writeToURL:audioFileURL options:NSDataWritingAtomic error:&error] {
    NSLog(@"Failed to write MP3 data: %@", error);
}