NSFileManager、NSFileHandle

#import "AppDelegate.h"
#define ERROR(a) if(a){NSLog(@"%@",a);exit(-1);}
#define PATH @"/Users/huen/Desktop/NSManage"
@implementation AppDelegate

    NSError *error = nil;
    NSFileManager *fm = [NSFileManager defaultManager];//单例对象
    /*
    NSArray *arr = [fm contentsOfDirectoryAtPath:PATH error:&error];//浅度遍历目录
    ERROR(error);//若上句报错，打印错误，退出程序
    NSLog(@"%@",arr);
    arr = [fm subpathsOfDirectoryAtPath:PATH error:&error];//深度遍历目录
    ERROR(error);//若上句报错，打印错误，退出程序
    NSLog(@"%@",arr);
    */
    //创建目录
    [fm createDirectoryAtPath:[NSString stringWithFormat:@"%@/middle/dir",PATH]
  withIntermediateDirectories:YES//支持创建middle文件
                   attributes:nil
                        error:&error];
    ERROR(error);
    //创建文件
    [fm createFileAtPath:[NSString stringWithFormat:@"%@/middle/dir/file.rtf",PATH]
                contents:[@"hello" dataUsingEncoding:NSUTF8StringEncoding]
              attributes:nil];
    ERROR(error);
    //
    [fm copyItemAtPath:[NSString stringWithFormat:@"%@/middle/dir/file.rtf",PATH]
                toPath:[NSString stringWithFormat:@"%@/middle/file.rtf",PATH]
                 error:&error];
    ERROR(error);
    
    [fm moveItemAtPath:[NSString stringWithFormat:@"%@/middle/dir",PATH]
                toPath:[NSString stringWithFormat:@"%@/dir",PATH]
                 error:&error];
    ERROR(error);
    //删除
//    [fm removeItemAtPath:[NSString stringWithFormat:@"%@/middle/file.rtf",PATH]
//                   error:&error];
//    ERROR (error);

    //文件写
    NSFileHandle *fhw = [NSFileHandle fileHandleForWritingAtPath:@"/Users/huen/Desktop/document.rtf"];
    //[fhw truncateFileAtOffset:0];//覆盖写
    [fhw seekToEndOfFile];//追加
    
    [fhw writeData:[@"xxx is a good man" dataUsingEncoding:NSUTF8StringEncoding]];
    //文件读
    NSFileHandle *fh = [NSFileHandle fileHandleForReadingAtPath:@"/Users/huen/Desktop/document.rtf"];
    NSData *data = [fh readDataToEndOfFile];
    NSString *s = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@",s);