ios 文件操作实例

ios文件操作实例，包括文件的创建等，还有文件搜索等，具体看code。

    //dicpath =Users/user/Library/Application Support/iPhone Simulator/5.1/Applications/5403DF94-1B63-4CCF-8A5B-548ED5902DBE/Documents/logs
    NSString *dicpath = [NSString stringWithFormat:@"%@/Documents/logs",NSHomeDirectory()];
    NSFileManager *fileManager = [NSFileManager defaultManager];
  
    NSArray *levelList = [[[[NSFileManager alloc] init]
                           contentsOfDirectoryAtPath:dicpath
                           error:nil] //得到文件列表
                          pathsMatchingExtensions:[NSArray arrayWithObject:@"html"]]; //过滤文件类型
    for (NSString *fname  in levelList) {
        //path =Users/user/Library/Application Support/iPhone Simulator/5.1/Applications/5403DF94-1B63-4CCF-8A5B-548ED5902DBE/Documents/logs/log2012_08_18.html
        NSString *path = [NSString stringWithFormat:@"%@/%@",dicpath,fname]; 
        /* fileAttributes=
         {
         NSFileCreationDate = "2012-08-18 06:31:17 +0000";
         NSFileExtensionHidden = 0;
         NSFileGroupOwnerAccountID = 20;
         NSFileGroupOwnerAccountName = staff;
         NSFileModificationDate = "2012-08-18 06:55:54 +0000";
         NSFileOwnerAccountID = 501;
         NSFileOwnerAccountName = user;
         NSFilePosixPermissions = 420;
         NSFileReferenceCount = 1;
         NSFileSize = 1855;
         NSFileSystemFileNumber = 4292809;
         NSFileSystemNumber = 234881027;
         NSFileType = NSFileTypeRegular;
         }
         */
    
        NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
        NSDate * creationDate=nil;            
        if ((creationDate = [fileAttributes objectForKey:NSFileCreationDate])) {
            NSLog(@"File creationDate---: %@\n", creationDate);
            // interval = -2660.19 
            NSTimeInterval interval = [creationDate timeIntervalSinceNow];
//            interval 是double，这里不可以用nslog
//             NSLog(@"File interval---: %@\n", interval); 
            printf("%f",interval);
            
        }
    }