#define KLOGGING_PATH @"/private/var/mobile/Library/ApplicationName"
#define KLOGGING_FILE @"debug.log"

void FileLog(NSString *format, ...)
{
      va_list ap;
      NSString *print;
      va_start(ap,format);
      print=[[NSString alloc] initWithFormat:format arguments:ap];
      va_end(ap);
       
      // create directory   
      [[NSFileManager defaultManager] createDirectoryAtPath:KLOGGING_PATH attributes:nil];
 
      // open file and create if not exist
      FILE *f = fopen([NSString stringWithFormat:@"%@/%@", KLOGGING_PATH, KLOGGING_FILE], "a");

      // write to file
      fprintf(f, "%s: %s\r\n", [[[NSDate date] description] UTF8String], [print UTF8String]);
      fclose(f);
   
      // write to console
      NSLog(print);

      [print release];
}