Logging to a file on the iPhone

Question

What would be the best way to write log statements to a file or database in an iPhone application?

Ideally, NSLog() output could be redirected to a file using freop

Answer 1

This code works great for me..

#if TARGET_IPHONE_SIMULATOR == 0
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *logPath = [documentsDirectory stringByAppendingPathComponent:@"console.log"];
    freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);
#endif

You can then get the log file off the iphone using the method outlined here http://blog.coriolis.ch/2009/01/09/redirect-nslog-to-a-file-on-the-iphone/#more-85

Note that using freopen will STOP THE CONSOLE IN XCODE working.. however, for some reason the console you can view in xcode's organiser still works great.